Merge branch 'develop' into documents-scraped

internal/tender_approval/errors.go

@@ -14,4 +14,5 @@ var (
 	ErrInvalidCompanyID       = errors.New("invalid company ID")
 	ErrUnauthorized           = errors.New("unauthorized to perform this action")
 	ErrInvalidData            = errors.New("invalid tender approval data")
+	ErrSubmissionSyncFailed   = errors.New("failed to sync tender submission workflow")
 )

internal/tender_approval/handler.go

@@ -60,11 +60,15 @@ func (h *Handler) ToggleTenderApproval(c echo.Context) error {
 		return response.BadRequest(c, "Company ID is required", "")
 	}
 
-	tenderApproval, err := h.service.ToggleTenderApproval(c.Request().Context(), form, companyID)
+	customerID, _ := customer.GetCustomerIDFromContext(c)
+	tenderApproval, err := h.service.ToggleTenderApproval(c.Request().Context(), form, companyID, customerID)
 	if err != nil {
 		if errors.Is(err, ErrTenderNotFound) {
 			return response.NotFound(c, "Tender not found")
 		}
+		if errors.Is(err, ErrSubmissionSyncFailed) {
+			return response.InternalServerError(c, "Failed to sync tender submission workflow")
+		}
 		if err.Error() == "tender approval already exists for this tender and company" {
 			return response.Conflict(c, err.Error())
 		}

internal/tender_approval/service.go

@@ -11,6 +11,13 @@ import (
 	"tm/pkg/response"
 )
 
+// SubmissionLifecycleHook synchronizes tender submission workflow with approval changes.
+type SubmissionLifecycleHook interface {
+	OnApprovalSubmitted(ctx context.Context, tenderID, companyID, customerID string) error
+	OnApprovalRemoved(ctx context.Context, tenderID, companyID string) error
+	OnApprovalRejected(ctx context.Context, tenderID, companyID, changedBy string) error
+}
+
 // Service defines business logic for tender approval operations
 type Service interface {
 	// Core tender approval operations
@@ -34,7 +41,7 @@ type Service interface {
 	SearchTenderApprovalsByCriteria(ctx context.Context, criteria *TenderApprovalSearchCriteria) ([]*TenderApproval, error)
 
 	// Business operations
-	ToggleTenderApproval(ctx context.Context, req *ToggleTenderApprovalForm, companyID string) (*TenderApprovalWithTenderResponse, error)
+	ToggleTenderApproval(ctx context.Context, req *ToggleTenderApprovalForm, companyID, customerID string) (*TenderApprovalWithTenderResponse, error)
 
 	// Statistics and analytics
 	GetTenderApprovalStats(ctx context.Context) (*TenderApprovalStatsResponse, error)
@@ -51,17 +58,19 @@ type Service interface {
 
 // tenderApprovalService implements the Service interface
 type tenderApprovalService struct {
-	repository    Repository
-	tenderService tender.Service
-	logger        logger.Logger
+	repository     Repository
+	tenderService  tender.Service
+	logger         logger.Logger
+	submissionHook SubmissionLifecycleHook
 }
 
 // NewService creates a new tender approval service
-func NewService(repository Repository, tenderService tender.Service, logger logger.Logger) Service {
+func NewService(repository Repository, tenderService tender.Service, logger logger.Logger, submissionHook SubmissionLifecycleHook) Service {
 	return &tenderApprovalService{
-		repository:    repository,
-		tenderService: tenderService,
-		logger:        logger,
+		repository:     repository,
+		tenderService:  tenderService,
+		logger:         logger,
+		submissionHook: submissionHook,
 	}
 }
 
@@ -853,7 +862,7 @@ func (s *tenderApprovalService) ListTenderApprovalsWithTender(ctx context.Contex
 	return meta, nil
 }
 
-func (s *tenderApprovalService) ToggleTenderApproval(ctx context.Context, req *ToggleTenderApprovalForm, companyID string) (*TenderApprovalWithTenderResponse, error) {
+func (s *tenderApprovalService) ToggleTenderApproval(ctx context.Context, req *ToggleTenderApprovalForm, companyID, customerID string) (*TenderApprovalWithTenderResponse, error) {
 	companyID = strings.TrimSpace(companyID)
 	if companyID == "" {
 		return nil, ErrInvalidCompanyID
@@ -899,6 +908,15 @@ func (s *tenderApprovalService) ToggleTenderApproval(ctx context.Context, req *T
 			return nil, err
 		}
 
+		if err := s.syncSubmissionAfterToggle(ctx, tenderID, companyID, customerID, req.Status, true); err != nil {
+			if deleteErr := s.repository.Delete(ctx, approval.GetID()); deleteErr != nil {
+				s.logger.Error("Failed to rollback tender approval after submission sync failure", map[string]interface{}{
+					"tender_approval_id": approval.GetID(),
+					"error":              deleteErr.Error(),
+				})
+			}
+			return nil, ErrSubmissionSyncFailed
+		}
 		return s.toggleResponseWithTender(ctx, approval)
 	}
 
@@ -917,6 +935,9 @@ func (s *tenderApprovalService) ToggleTenderApproval(ctx context.Context, req *T
 			existing.Status = "unrejected"
 		}
 
+		if err := s.syncSubmissionAfterToggle(ctx, tenderID, companyID, customerID, req.Status, false); err != nil {
+			return nil, ErrSubmissionSyncFailed
+		}
 		return existing.ToResponseWithTender(nil), nil
 	}
 
@@ -939,9 +960,38 @@ func (s *tenderApprovalService) ToggleTenderApproval(ctx context.Context, req *T
 		return nil, err
 	}
 
+	if err := s.syncSubmissionAfterToggle(ctx, tenderID, companyID, customerID, req.Status, true); err != nil {
+		return nil, ErrSubmissionSyncFailed
+	}
 	return s.toggleResponseWithTender(ctx, existing)
 }
 
+func (s *tenderApprovalService) syncSubmissionAfterToggle(ctx context.Context, tenderID, companyID, customerID string, status ApprovalStatus, active bool) error {
+	if s.submissionHook == nil {
+		return nil
+	}
+
+	var err error
+	if !active {
+		err = s.submissionHook.OnApprovalRemoved(ctx, tenderID, companyID)
+	} else if status == ApprovalStatusSubmitted {
+		err = s.submissionHook.OnApprovalSubmitted(ctx, tenderID, companyID, customerID)
+	} else if status == ApprovalStatusRejected {
+		err = s.submissionHook.OnApprovalRejected(ctx, tenderID, companyID, customerID)
+	}
+
+	if err != nil {
+		s.logger.Error("Failed to sync tender submission workflow after approval toggle", map[string]interface{}{
+			"tender_id":  tenderID,
+			"company_id": companyID,
+			"status":     status,
+			"active":     active,
+			"error":      err.Error(),
+		})
+	}
+	return err
+}
+
 func (s *tenderApprovalService) toggleResponseWithTender(ctx context.Context, approval *TenderApproval) (*TenderApprovalWithTenderResponse, error) {
 	if approval == nil {
 		return nil, ErrInvalidData

internal/tender_submission/entity.go

@@ -0,0 +1,168 @@
+package tender_submission
+
+import (
+	"time"
+	"tm/pkg/mongo"
+)
+
+// SubmissionStatus represents the current step in the tender submission workflow.
+type SubmissionStatus string
+
+const (
+	StatusOpportunity    SubmissionStatus = "opportunity"
+	StatusValidating     SubmissionStatus = "validating"
+	StatusPartnerPending SubmissionStatus = "partner_pending"
+	StatusApplying       SubmissionStatus = "applying"
+	StatusSentWaiting    SubmissionStatus = "sent_waiting"
+	StatusRejected       SubmissionStatus = "rejected"
+	StatusContract       SubmissionStatus = "contract"
+	StatusNotApplied     SubmissionStatus = "not_applied"
+)
+
+// SubmissionStage groups statuses into high-level workflow stages for UI display.
+type SubmissionStage string
+
+const (
+	StageOpportunity  SubmissionStage = "opportunity"
+	StageInProgress   SubmissionStage = "in_progress"
+	StageSubmitted    SubmissionStage = "submitted"
+	StageNotApplied   SubmissionStage = "not_applied"
+)
+
+// StatusHistory records a status change in the submission workflow.
+type StatusHistory struct {
+	Status      SubmissionStatus `bson:"status" json:"status"`
+	Reason      string           `bson:"reason,omitempty" json:"reason,omitempty"`
+	ChangedBy   string           `bson:"changed_by" json:"changed_by"`
+	ChangedAt   int64            `bson:"changed_at" json:"changed_at"`
+	Description string           `bson:"description,omitempty" json:"description,omitempty"`
+}
+
+// TenderSubmission tracks a company's tender submission workflow.
+type TenderSubmission struct {
+	mongo.Model `bson:",inline"`
+
+	TenderID   string           `bson:"tender_id" json:"tender_id"`
+	CompanyID  string           `bson:"company_id" json:"company_id"`
+	CustomerID string           `bson:"customer_id,omitempty" json:"customer_id,omitempty"`
+	Status     SubmissionStatus `bson:"status" json:"status"`
+	Stage      SubmissionStage  `bson:"stage" json:"stage"`
+	History    []StatusHistory  `bson:"status_history" json:"status_history"`
+}
+
+func StageForStatus(status SubmissionStatus) SubmissionStage {
+	switch status {
+	case StatusOpportunity:
+		return StageOpportunity
+	case StatusValidating, StatusPartnerPending, StatusApplying:
+		return StageInProgress
+	case StatusSentWaiting, StatusRejected, StatusContract:
+		return StageSubmitted
+	case StatusNotApplied:
+		return StageNotApplied
+	default:
+		return StageOpportunity
+	}
+}
+
+func IsTerminalStatus(status SubmissionStatus) bool {
+	switch status {
+	case StatusRejected, StatusContract, StatusNotApplied:
+		return true
+	default:
+		return false
+	}
+}
+
+func AllowedNextStatuses(current SubmissionStatus) []SubmissionStatus {
+	transitions := map[SubmissionStatus][]SubmissionStatus{
+		StatusOpportunity:    {StatusValidating, StatusNotApplied},
+		StatusValidating:     {StatusPartnerPending, StatusApplying, StatusNotApplied},
+		StatusPartnerPending: {StatusApplying, StatusNotApplied},
+		StatusApplying:       {StatusSentWaiting, StatusNotApplied},
+		StatusSentWaiting:    {StatusRejected, StatusContract},
+		StatusRejected:       {},
+		StatusContract:       {},
+		StatusNotApplied:     {},
+	}
+	return transitions[current]
+}
+
+func (ts *TenderSubmission) GetID() string {
+	return ts.ID.Hex()
+}
+
+func (ts *TenderSubmission) SetCreatedAt(timestamp int64) {
+	ts.CreatedAt = timestamp
+}
+
+func (ts *TenderSubmission) SetUpdatedAt(timestamp int64) {
+	ts.UpdatedAt = timestamp
+}
+
+func (ts *TenderSubmission) AddStatusChange(status SubmissionStatus, reason, changedBy, description string) {
+	ts.History = append(ts.History, StatusHistory{
+		Status:      status,
+		Reason:      reason,
+		ChangedBy:   changedBy,
+		ChangedAt:   time.Now().Unix(),
+		Description: description,
+	})
+	ts.Status = status
+	ts.Stage = StageForStatus(status)
+	ts.SetUpdatedAt(time.Now().Unix())
+}
+
+// ReopenForApproval resets a terminal submission when the tender is approved again.
+// This is only used by the approval sync path, not by user-initiated status updates.
+func (ts *TenderSubmission) ReopenForApproval(changedBy, description string) {
+	ts.AddStatusChange(StatusOpportunity, "approval_resubmitted", changedBy, description)
+}
+
+func NewTenderSubmission(tenderID, companyID, customerID string) *TenderSubmission {
+	now := time.Now().Unix()
+	ts := &TenderSubmission{
+		TenderID:   tenderID,
+		CompanyID:  companyID,
+		CustomerID: customerID,
+		Status:     StatusOpportunity,
+		Stage:      StageOpportunity,
+	}
+	ts.SetCreatedAt(now)
+	ts.SetUpdatedAt(now)
+	ts.AddStatusChange(StatusOpportunity, "", customerID, "Submission workflow started")
+	return ts
+}
+
+func (ts *TenderSubmission) ToResponse() *TenderSubmissionResponse {
+	history := make([]StatusHistoryResponse, len(ts.History))
+	for i, h := range ts.History {
+		history[i] = StatusHistoryResponse{
+			Status:      string(h.Status),
+			Reason:      h.Reason,
+			ChangedBy:   h.ChangedBy,
+			ChangedAt:   h.ChangedAt,
+			Description: h.Description,
+		}
+	}
+
+	return &TenderSubmissionResponse{
+		ID:         ts.GetID(),
+		TenderID:   ts.TenderID,
+		CompanyID:  ts.CompanyID,
+		CustomerID: ts.CustomerID,
+		Status:     string(ts.Status),
+		Stage:      string(ts.Stage),
+		History:    history,
+		CreatedAt:  ts.CreatedAt,
+		UpdatedAt:  ts.UpdatedAt,
+	}
+}
+
+func (ts *TenderSubmission) ToResponseWithTender(tender *TenderDetails) *TenderSubmissionWithTenderResponse {
+	resp := ts.ToResponse()
+	return &TenderSubmissionWithTenderResponse{
+		TenderSubmissionResponse: *resp,
+		Tender:                   tender,
+	}
+}

internal/tender_submission/entity_test.go

@@ -0,0 +1,98 @@
+package tender_submission
+
+import "testing"
+
+func TestStageForStatus(t *testing.T) {
+	tests := []struct {
+		status SubmissionStatus
+		stage  SubmissionStage
+	}{
+		{StatusOpportunity, StageOpportunity},
+		{StatusValidating, StageInProgress},
+		{StatusPartnerPending, StageInProgress},
+		{StatusApplying, StageInProgress},
+		{StatusSentWaiting, StageSubmitted},
+		{StatusRejected, StageSubmitted},
+		{StatusContract, StageSubmitted},
+		{StatusNotApplied, StageNotApplied},
+	}
+
+	for _, tt := range tests {
+		if got := StageForStatus(tt.status); got != tt.stage {
+			t.Fatalf("StageForStatus(%q) = %q, want %q", tt.status, got, tt.stage)
+		}
+	}
+}
+
+func TestAllowedNextStatuses(t *testing.T) {
+	tests := []struct {
+		current SubmissionStatus
+		next    SubmissionStatus
+		allowed bool
+	}{
+		{StatusOpportunity, StatusValidating, true},
+		{StatusOpportunity, StatusNotApplied, true},
+		{StatusOpportunity, StatusApplying, false},
+		{StatusValidating, StatusPartnerPending, true},
+		{StatusValidating, StatusApplying, true},
+		{StatusValidating, StatusNotApplied, true},
+		{StatusPartnerPending, StatusApplying, true},
+		{StatusApplying, StatusSentWaiting, true},
+		{StatusSentWaiting, StatusContract, true},
+		{StatusSentWaiting, StatusRejected, true},
+		{StatusContract, StatusRejected, false},
+		{StatusNotApplied, StatusValidating, false},
+	}
+
+	for _, tt := range tests {
+		allowed := false
+		for _, candidate := range AllowedNextStatuses(tt.current) {
+			if candidate == tt.next {
+				allowed = true
+				break
+			}
+		}
+		if allowed != tt.allowed {
+			t.Fatalf("transition %q -> %q allowed=%v, want %v", tt.current, tt.next, allowed, tt.allowed)
+		}
+	}
+}
+
+func TestAddStatusChangeUpdatesStage(t *testing.T) {
+	submission := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	submission.AddStatusChange(StatusValidating, "", "customer-1", "Accepted tender")
+
+	if submission.Status != StatusValidating {
+		t.Fatalf("status = %q, want %q", submission.Status, StatusValidating)
+	}
+	if submission.Stage != StageInProgress {
+		t.Fatalf("stage = %q, want %q", submission.Stage, StageInProgress)
+	}
+	if len(submission.History) != 2 {
+		t.Fatalf("history length = %d, want 2", len(submission.History))
+	}
+}
+
+func TestValidateStatusTransition(t *testing.T) {
+	service := &tenderSubmissionService{}
+
+	if err := service.validateStatusTransition(StatusOpportunity, StatusValidating); err != nil {
+		t.Fatalf("expected valid transition, got %v", err)
+	}
+
+	if err := service.validateStatusTransition(StatusContract, StatusRejected); err == nil {
+		t.Fatal("expected terminal status error")
+	}
+
+	err := service.validateStatusTransition(StatusOpportunity, StatusApplying)
+	if err == nil {
+		t.Fatal("expected invalid transition error")
+	}
+	transitionErr, ok := err.(*InvalidStatusTransitionError)
+	if !ok {
+		t.Fatalf("expected InvalidStatusTransitionError, got %T", err)
+	}
+	if transitionErr.CurrentStatus != string(StatusOpportunity) {
+		t.Fatalf("current status = %q", transitionErr.CurrentStatus)
+	}
+}

internal/tender_submission/errors.go

@@ -0,0 +1,46 @@
+package tender_submission
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+var (
+	ErrTenderSubmissionNotFound = errors.New("tender submission not found")
+	ErrTenderSubmissionExists   = errors.New("tender submission already exists for this tender and company")
+	ErrInvalidStatus            = errors.New("invalid tender submission status")
+	ErrInvalidStage             = errors.New("invalid tender submission stage")
+	ErrTenderNotFound           = errors.New("tender not found")
+	ErrApprovalRequired         = errors.New("tender must be approved before starting submission workflow")
+	ErrInvalidStatusTransition  = errors.New("invalid status transition")
+	ErrTerminalStatus           = errors.New("tender submission is in a terminal state and cannot be updated")
+	ErrConcurrentUpdate         = errors.New("tender submission was modified concurrently")
+)
+
+// InvalidStatusTransitionError is returned when a status change is not allowed.
+type InvalidStatusTransitionError struct {
+	CurrentStatus string
+	NewStatus     string
+	Allowed       []string
+}
+
+func (e *InvalidStatusTransitionError) Error() string {
+	if len(e.Allowed) == 0 {
+		return fmt.Sprintf("Tender submission status is already %s and cannot be changed", e.CurrentStatus)
+	}
+	return fmt.Sprintf(
+		"Cannot change tender submission status from %s to %s. Allowed next statuses: %s",
+		e.CurrentStatus,
+		e.NewStatus,
+		strings.Join(e.Allowed, ", "),
+	)
+}
+
+func NewInvalidStatusTransitionError(currentStatus, newStatus string, allowed []string) *InvalidStatusTransitionError {
+	return &InvalidStatusTransitionError{
+		CurrentStatus: currentStatus,
+		NewStatus:     newStatus,
+		Allowed:       allowed,
+	}
+}

internal/tender_submission/form.go

@@ -0,0 +1,100 @@
+package tender_submission
+
+import "tm/pkg/response"
+
+// UpdateSubmissionStatusForm updates the workflow status of a tender submission.
+type UpdateSubmissionStatusForm struct {
+	Status      SubmissionStatus `json:"status" valid:"required,in(opportunity|validating|partner_pending|applying|sent_waiting|rejected|contract|not_applied)"`
+	Reason      string           `json:"reason,omitempty" valid:"optional,length(0|500)"`
+	Description string           `json:"description,omitempty" valid:"optional,length(0|1000)"`
+}
+
+// ListTenderSubmissionsForm filters company tender submissions.
+type ListTenderSubmissionsForm struct {
+	TenderID  *string  `query:"tender_id" valid:"optional"`
+	CompanyID *string  `query:"company_id" valid:"optional"`
+	Status    []string `query:"status" valid:"optional"`
+	Stage     []string `query:"stage" valid:"optional"`
+	From      *int64   `query:"created_from" valid:"optional"`
+	To        *int64   `query:"created_to" valid:"optional"`
+	Limit     *int     `query:"limit" valid:"optional,range(1|100)"`
+	Offset    *int     `query:"offset" valid:"optional,range(0|1000000)"`
+	SortBy    *string  `query:"sort_by" valid:"optional,in(created_at|updated_at|status|stage)"`
+	SortOrder *string  `query:"sort_order" valid:"optional,in(asc|desc)"`
+}
+
+// TenderSubmissionResponse is the API response for a tender submission.
+type TenderSubmissionResponse struct {
+	ID         string                  `json:"id"`
+	TenderID   string                  `json:"tender_id"`
+	CompanyID  string                  `json:"company_id"`
+	CustomerID string                  `json:"customer_id,omitempty"`
+	Status     string                  `json:"status"`
+	Stage      string                  `json:"stage"`
+	History    []StatusHistoryResponse `json:"status_history"`
+	CreatedAt  int64                   `json:"created_at"`
+	UpdatedAt  int64                   `json:"updated_at"`
+}
+
+// StatusHistoryResponse is the API representation of a status change.
+type StatusHistoryResponse struct {
+	Status      string `json:"status"`
+	Reason      string `json:"reason,omitempty"`
+	ChangedBy   string `json:"changed_by"`
+	ChangedAt   int64  `json:"changed_at"`
+	Description string `json:"description,omitempty"`
+}
+
+// TenderSubmissionWithTenderResponse includes tender details.
+type TenderSubmissionWithTenderResponse struct {
+	TenderSubmissionResponse
+	Tender *TenderDetails `json:"tender,omitempty"`
+}
+
+// TenderSubmissionListResponse is a paginated list of submissions with tender details.
+type TenderSubmissionListResponse struct {
+	Submissions []*TenderSubmissionWithTenderResponse `json:"submissions"`
+	Metadata    *response.Meta                        `json:"metadata"`
+}
+
+// TenderDetails represents essential tender information for submission responses.
+type TenderDetails struct {
+	ID                  string                `json:"id"`
+	NoticePublicationID string                `json:"notice_publication_id"`
+	PublicationDate     int64                 `json:"publication_date"`
+	Title               string                `json:"title"`
+	Description         string                `json:"description"`
+	ProcurementTypeCode string                `json:"procurement_type_code"`
+	ProcedureCode       string                `json:"procedure_code"`
+	EstimatedValue      float64               `json:"estimated_value"`
+	Currency            string                `json:"currency"`
+	Duration            string                `json:"duration"`
+	DurationUnit        string                `json:"duration_unit"`
+	TenderDeadline      int64                 `json:"tender_deadline"`
+	SubmissionDeadline  int64                 `json:"submission_deadline"`
+	CountryCode         string                `json:"country_code"`
+	BuyerOrganization   *OrganizationResponse `json:"buyer_organization"`
+	Status              string                `json:"status"`
+}
+
+// OrganizationResponse represents buyer organization info.
+type OrganizationResponse struct {
+	Name string `json:"name"`
+}
+
+// CompanySubmissionStatsResponse contains submission counts grouped by stage and status.
+type CompanySubmissionStatsResponse struct {
+	CompanyID     string           `json:"company_id"`
+	Total         int64            `json:"total"`
+	ByStage       map[string]int64 `json:"by_stage"`
+	ByStatus      map[string]int64 `json:"by_status"`
+	LastUpdated   int64            `json:"last_updated"`
+}
+
+// AdminSubmissionStatsResponse contains global submission statistics.
+type AdminSubmissionStatsResponse struct {
+	Total       int64            `json:"total"`
+	ByStage     map[string]int64 `json:"by_stage"`
+	ByStatus    map[string]int64 `json:"by_status"`
+	LastUpdated int64            `json:"last_updated"`
+}

internal/tender_submission/handler.go

@@ -0,0 +1,334 @@
+package tender_submission
+
+import (
+	"errors"
+	"strings"
+	"tm/internal/customer"
+	"tm/pkg/logger"
+	"tm/pkg/response"
+
+	"github.com/labstack/echo/v4"
+)
+
+// Handler handles HTTP requests for tender submission operations.
+type Handler struct {
+	service Service
+	logger  logger.Logger
+}
+
+func NewHandler(service Service, logger logger.Logger) *Handler {
+	return &Handler{service: service, logger: logger}
+}
+
+// ListCompanySubmissions lists tender submissions for the authenticated company.
+// @Summary List company tender submissions
+// @Description Retrieve paginated tender submission workflows for the authenticated company
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param status query []string false "Filter by status"
+// @Param stage query []string false "Filter by stage"
+// @Param created_from query int false "Filter by created date from (Unix timestamp)"
+// @Param created_to query int false "Filter by created date to (Unix timestamp)"
+// @Param limit query int false "Page size (default 20, max 100)"
+// @Param offset query int false "Pagination offset"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionListResponse}
+// @Failure 401 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions [get]
+func (h *Handler) ListCompanySubmissions(c echo.Context) error {
+	companyID, ok := c.Get("company_id").(string)
+	if !ok || companyID == "" {
+		return response.Unauthorized(c, "Unauthorized")
+	}
+
+	form, err := response.Parse[ListTenderSubmissionsForm](c)
+	if err != nil {
+		return response.ValidationError(c, "Invalid request data", err.Error())
+	}
+
+	result, err := h.service.ListByCompanyWithTender(c.Request().Context(), companyID, form)
+	if err != nil {
+		return response.InternalServerError(c, "Failed to list tender submissions")
+	}
+
+	return response.SuccessWithMeta(c, result.Submissions, result.Metadata, "Tender submissions retrieved successfully")
+}
+
+// EnsureSubmission ensures a submission workflow exists for an approved tender.
+// @Summary Ensure tender submission workflow
+// @Description Create or return the submission workflow for an approved tender
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param tender_id path string true "Tender ID"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionWithTenderResponse}
+// @Failure 400 {object} response.APIResponse
+// @Failure 404 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions/tender/{tender_id}/ensure [post]
+func (h *Handler) EnsureSubmission(c echo.Context) error {
+	companyID, err := h.resolveCompanyID(c)
+	if err != nil {
+		if errors.Is(err, customer.ErrCompanyNotAssigned) {
+			return response.Forbidden(c, "Company is not assigned to customer")
+		}
+		return response.BadRequest(c, "Company ID is required", "")
+	}
+
+	customerID, _ := customer.GetCustomerIDFromContext(c)
+	tenderID := strings.TrimSpace(c.Param("tender_id"))
+	if tenderID == "" {
+		return response.BadRequest(c, "Tender ID is required", "")
+	}
+
+	result, err := h.service.EnsureForApprovedTender(c.Request().Context(), tenderID, companyID, customerID)
+	if err != nil {
+		if errors.Is(err, ErrTenderNotFound) {
+			return response.NotFound(c, "Tender not found")
+		}
+		if errors.Is(err, ErrApprovalRequired) {
+			return response.BadRequest(c, "Tender must be approved before starting submission workflow", "")
+		}
+		return response.InternalServerError(c, "Failed to ensure tender submission")
+	}
+
+	return response.Success(c, result, "Tender submission ensured successfully")
+}
+
+// GetSubmissionByID retrieves a tender submission by ID for the authenticated company.
+// @Summary Get tender submission by ID
+// @Description Retrieve a tender submission workflow with tender details for the authenticated company
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param id path string true "Submission ID"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionWithTenderResponse}
+// @Failure 401 {object} response.APIResponse
+// @Failure 404 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions/{id} [get]
+func (h *Handler) GetSubmissionByID(c echo.Context) error {
+	companyID, ok := c.Get("company_id").(string)
+	if !ok || companyID == "" {
+		return response.Unauthorized(c, "Unauthorized")
+	}
+
+	id := strings.TrimSpace(c.Param("id"))
+	if id == "" {
+		return response.BadRequest(c, "Submission ID is required", "")
+	}
+
+	result, err := h.service.GetByIDForCompanyWithTender(c.Request().Context(), id, companyID)
+	if err != nil {
+		if errors.Is(err, ErrTenderSubmissionNotFound) {
+			return response.NotFound(c, "Tender submission not found")
+		}
+		return response.InternalServerError(c, "Failed to get tender submission")
+	}
+
+	return response.Success(c, result, "Tender submission retrieved successfully")
+}
+
+// GetSubmissionByTender retrieves a submission by tender and company.
+// @Summary Get tender submission by tender
+// @Description Retrieve the submission workflow for a specific tender and company
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param tender_id path string true "Tender ID"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionWithTenderResponse}
+// @Failure 404 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions/tender/{tender_id} [get]
+func (h *Handler) GetSubmissionByTender(c echo.Context) error {
+	companyID, ok := c.Get("company_id").(string)
+	if !ok || companyID == "" {
+		return response.Unauthorized(c, "Unauthorized")
+	}
+
+	tenderID := strings.TrimSpace(c.Param("tender_id"))
+	if tenderID == "" {
+		return response.BadRequest(c, "Tender ID is required", "")
+	}
+
+	result, err := h.service.GetByTenderAndCompanyWithTender(c.Request().Context(), tenderID, companyID)
+	if err != nil {
+		if errors.Is(err, ErrTenderNotFound) || errors.Is(err, ErrTenderSubmissionNotFound) {
+			return response.NotFound(c, "Tender submission not found")
+		}
+		return response.InternalServerError(c, "Failed to get tender submission")
+	}
+
+	return response.Success(c, result, "Tender submission retrieved successfully")
+}
+
+// UpdateSubmissionStatus updates the workflow status of a submission.
+// @Summary Update tender submission status
+// @Description Move a tender submission to the next workflow step
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param id path string true "Submission ID"
+// @Param body body UpdateSubmissionStatusForm true "Status update"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionWithTenderResponse}
+// @Failure 400 {object} response.APIResponse
+// @Failure 404 {object} response.APIResponse
+// @Failure 422 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions/{id}/status [patch]
+func (h *Handler) UpdateSubmissionStatus(c echo.Context) error {
+	id := strings.TrimSpace(c.Param("id"))
+	if id == "" {
+		return response.BadRequest(c, "Submission ID is required", "")
+	}
+
+	form, err := response.Parse[UpdateSubmissionStatusForm](c)
+	if err != nil {
+		return response.ValidationError(c, "Invalid request data", err.Error())
+	}
+
+	companyID, err := h.resolveCompanyID(c)
+	if err != nil {
+		if errors.Is(err, customer.ErrCompanyNotAssigned) {
+			return response.Forbidden(c, "Company is not assigned to customer")
+		}
+		return response.BadRequest(c, "Company ID is required", "")
+	}
+
+	customerID, _ := customer.GetCustomerIDFromContext(c)
+	result, err := h.service.UpdateStatus(c.Request().Context(), id, form, companyID, customerID)
+	if err != nil {
+		if errors.Is(err, ErrTenderSubmissionNotFound) {
+			return response.NotFound(c, "Tender submission not found")
+		}
+		var transitionErr *InvalidStatusTransitionError
+		if errors.As(err, &transitionErr) {
+			return response.ValidationError(c, "Invalid status transition", err.Error())
+		}
+		if errors.Is(err, ErrTerminalStatus) {
+			return response.ValidationError(c, "Submission is in a terminal state", err.Error())
+		}
+		if errors.Is(err, ErrConcurrentUpdate) {
+			return response.Conflict(c, "Tender submission was modified concurrently")
+		}
+		return response.InternalServerError(c, "Failed to update tender submission status")
+	}
+
+	return response.Success(c, result, "Tender submission status updated successfully")
+}
+
+// GetCompanySubmissionStats returns submission statistics for the company.
+// @Summary Get company tender submission statistics
+// @Description Retrieve submission counts grouped by stage and status
+// @Tags TenderSubmissions
+// @Accept json
+// @Produce json
+// @Success 200 {object} response.APIResponse{data=CompanySubmissionStatsResponse}
+// @Failure 401 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /api/v1/tender-submissions/stats [get]
+func (h *Handler) GetCompanySubmissionStats(c echo.Context) error {
+	companyID, ok := c.Get("company_id").(string)
+	if !ok || companyID == "" {
+		return response.Unauthorized(c, "Unauthorized")
+	}
+
+	stats, err := h.service.GetCompanyStats(c.Request().Context(), companyID)
+	if err != nil {
+		return response.InternalServerError(c, "Failed to get submission statistics")
+	}
+
+	return response.Success(c, stats, "Submission statistics retrieved successfully")
+}
+
+// AdminListSubmissions lists tender submissions for admin users.
+// @Summary Admin list tender submissions
+// @Description Retrieve paginated tender submissions across companies
+// @Tags Admin-TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param company_id query string false "Filter by company ID"
+// @Param tender_id query string false "Filter by tender ID"
+// @Param status query []string false "Filter by status"
+// @Param stage query []string false "Filter by stage"
+// @Param limit query int false "Page size"
+// @Param offset query int false "Pagination offset"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionListResponse}
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /admin/v1/tender-submissions [get]
+func (h *Handler) AdminListSubmissions(c echo.Context) error {
+	form, err := response.Parse[ListTenderSubmissionsForm](c)
+	if err != nil {
+		return response.ValidationError(c, "Invalid request data", err.Error())
+	}
+
+	result, err := h.service.AdminListWithTender(c.Request().Context(), form)
+	if err != nil {
+		return response.InternalServerError(c, "Failed to list tender submissions")
+	}
+
+	return response.SuccessWithMeta(c, result.Submissions, result.Metadata, "Tender submissions retrieved successfully")
+}
+
+// AdminGetSubmissionByID retrieves a submission by ID for admin users.
+// @Summary Admin get tender submission by ID
+// @Description Retrieve a tender submission workflow with tender details
+// @Tags Admin-TenderSubmissions
+// @Accept json
+// @Produce json
+// @Param id path string true "Submission ID"
+// @Success 200 {object} response.APIResponse{data=TenderSubmissionWithTenderResponse}
+// @Failure 404 {object} response.APIResponse
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /admin/v1/tender-submissions/{id} [get]
+func (h *Handler) AdminGetSubmissionByID(c echo.Context) error {
+	id := strings.TrimSpace(c.Param("id"))
+	if id == "" {
+		return response.BadRequest(c, "Submission ID is required", "")
+	}
+
+	result, err := h.service.GetByIDWithTender(c.Request().Context(), id)
+	if err != nil {
+		if errors.Is(err, ErrTenderSubmissionNotFound) {
+			return response.NotFound(c, "Tender submission not found")
+		}
+		return response.InternalServerError(c, "Failed to get tender submission")
+	}
+
+	return response.Success(c, result, "Tender submission retrieved successfully")
+}
+
+// AdminGetSubmissionStats returns global submission statistics.
+// @Summary Admin get tender submission statistics
+// @Description Retrieve global submission counts grouped by stage and status
+// @Tags Admin-TenderSubmissions
+// @Accept json
+// @Produce json
+// @Success 200 {object} response.APIResponse{data=AdminSubmissionStatsResponse}
+// @Failure 500 {object} response.APIResponse
+// @Security BearerAuth
+// @Router /admin/v1/tender-submissions/stats [get]
+func (h *Handler) AdminGetSubmissionStats(c echo.Context) error {
+	stats, err := h.service.GetGlobalStats(c.Request().Context())
+	if err != nil {
+		return response.InternalServerError(c, "Failed to get submission statistics")
+	}
+	return response.Success(c, stats, "Submission statistics retrieved successfully")
+}
+
+func (h *Handler) resolveCompanyID(c echo.Context) (string, error) {
+	requestedCompanyID := strings.TrimSpace(c.QueryParam("company_id"))
+	activeCompanyID, _ := c.Get("company_id").(string)
+	assignedCompanyIDs, _ := c.Get("company_ids").([]string)
+
+	return customer.PickAssignedCompanyID(activeCompanyID, assignedCompanyIDs, requestedCompanyID)
+}

internal/tender_submission/repository.go

@@ -0,0 +1,346 @@
+package tender_submission
+
+import (
+	"context"
+	"errors"
+	"time"
+	"tm/pkg/logger"
+	"tm/pkg/mongo"
+
+	"go.mongodb.org/mongo-driver/v2/bson"
+	mongodriver "go.mongodb.org/mongo-driver/v2/mongo"
+)
+
+const maxListLimit = 100
+
+// Repository defines data access for tender submissions.
+type Repository interface {
+	Create(ctx context.Context, submission *TenderSubmission) error
+	GetByID(ctx context.Context, id string) (*TenderSubmission, error)
+	GetByTenderAndCompany(ctx context.Context, tenderID, companyID string) (*TenderSubmission, error)
+	Update(ctx context.Context, submission *TenderSubmission) error
+	UpdateIfUpdatedAt(ctx context.Context, submission *TenderSubmission, expectedUpdatedAt int64) error
+	Delete(ctx context.Context, id string) error
+	ListByCompany(ctx context.Context, companyID string, statuses []SubmissionStatus, stages []SubmissionStage, from, to *int64, limit, offset int, sortBy, sortOrder string) ([]*TenderSubmission, int64, error)
+	Search(ctx context.Context, tenderID, companyID *string, statuses []SubmissionStatus, stages []SubmissionStage, from, to *int64, limit, offset int, sortBy, sortOrder string) ([]*TenderSubmission, int64, error)
+	GetCompanyStats(ctx context.Context, companyID string) (*CompanySubmissionStatsResponse, error)
+	GetGlobalStats(ctx context.Context) (*AdminSubmissionStatsResponse, error)
+}
+
+type tenderSubmissionRepository struct {
+	ormRepo    mongo.Repository[TenderSubmission]
+	collection *mongodriver.Collection
+	logger     logger.Logger
+}
+
+func NewRepository(mongoManager *mongo.ConnectionManager, logger logger.Logger) Repository {
+	indexes := []mongo.Index{
+		*mongo.CreateUniqueIndex("tender_company_idx", bson.D{{Key: "tender_id", Value: 1}, {Key: "company_id", Value: 1}}),
+		*mongo.NewIndex("tender_id_idx", bson.D{{Key: "tender_id", Value: 1}}),
+		*mongo.NewIndex("company_id_idx", bson.D{{Key: "company_id", Value: 1}}),
+		*mongo.NewIndex("status_idx", bson.D{{Key: "status", Value: 1}}),
+		*mongo.NewIndex("stage_idx", bson.D{{Key: "stage", Value: 1}}),
+		*mongo.NewIndex("created_at_idx", bson.D{{Key: "created_at", Value: -1}}),
+		*mongo.NewIndex("updated_at_idx", bson.D{{Key: "updated_at", Value: -1}}),
+	}
+
+	if err := mongoManager.CreateIndexes("tender_submissions", indexes); err != nil {
+		logger.Warn("Failed to create tender submission indexes", map[string]interface{}{
+			"error": err.Error(),
+		})
+	}
+
+	collection := mongoManager.GetCollection("tender_submissions")
+	ormRepo := mongo.NewRepository[TenderSubmission](collection, logger)
+	return &tenderSubmissionRepository{ormRepo: ormRepo, collection: collection, logger: logger}
+}
+
+func (r *tenderSubmissionRepository) Create(ctx context.Context, submission *TenderSubmission) error {
+	now := time.Now().Unix()
+	submission.SetCreatedAt(now)
+	submission.SetUpdatedAt(now)
+
+	if err := r.ormRepo.Create(ctx, submission); err != nil {
+		if mongo.IsDuplicateKeyError(err) {
+			return ErrTenderSubmissionExists
+		}
+		r.logger.Error("Failed to create tender submission", map[string]interface{}{
+			"error":      err.Error(),
+			"tender_id":  submission.TenderID,
+			"company_id": submission.CompanyID,
+		})
+		return err
+	}
+
+	r.logger.Info("Tender submission created", map[string]interface{}{
+		"submission_id": submission.GetID(),
+		"tender_id":     submission.TenderID,
+		"company_id":    submission.CompanyID,
+		"status":        submission.Status,
+	})
+	return nil
+}
+
+func (r *tenderSubmissionRepository) GetByID(ctx context.Context, id string) (*TenderSubmission, error) {
+	submission, err := r.ormRepo.FindByID(ctx, id)
+	if err != nil {
+		if errors.Is(err, mongo.ErrDocumentNotFound) {
+			return nil, ErrTenderSubmissionNotFound
+		}
+		r.logger.Error("Failed to get tender submission by ID", map[string]interface{}{
+			"error":         err.Error(),
+			"submission_id": id,
+		})
+		return nil, err
+	}
+	return submission, nil
+}
+
+func (r *tenderSubmissionRepository) GetByTenderAndCompany(ctx context.Context, tenderID, companyID string) (*TenderSubmission, error) {
+	filter := bson.M{"tender_id": tenderID, "company_id": companyID}
+	submission, err := r.ormRepo.FindOne(ctx, filter)
+	if err != nil {
+		if errors.Is(err, mongo.ErrDocumentNotFound) {
+			return nil, ErrTenderSubmissionNotFound
+		}
+		r.logger.Error("Failed to get tender submission by tender and company", map[string]interface{}{
+			"error":      err.Error(),
+			"tender_id":  tenderID,
+			"company_id": companyID,
+		})
+		return nil, err
+	}
+	return submission, nil
+}
+
+func (r *tenderSubmissionRepository) Update(ctx context.Context, submission *TenderSubmission) error {
+	submission.SetUpdatedAt(time.Now().Unix())
+	if err := r.ormRepo.Update(ctx, submission); err != nil {
+		if errors.Is(err, mongo.ErrDocumentNotFound) {
+			return ErrTenderSubmissionNotFound
+		}
+		r.logger.Error("Failed to update tender submission", map[string]interface{}{
+			"error":         err.Error(),
+			"submission_id": submission.GetID(),
+		})
+		return err
+	}
+	return nil
+}
+
+func (r *tenderSubmissionRepository) UpdateIfUpdatedAt(ctx context.Context, submission *TenderSubmission, expectedUpdatedAt int64) error {
+	objectID, err := bson.ObjectIDFromHex(submission.GetID())
+	if err != nil {
+		return err
+	}
+
+	newUpdatedAt := time.Now().Unix()
+	submission.SetUpdatedAt(newUpdatedAt)
+
+	filter := bson.M{"_id": objectID, "updated_at": expectedUpdatedAt}
+	result, err := r.collection.UpdateOne(ctx, filter, bson.M{"$set": submission})
+	if err != nil {
+		r.logger.Error("Failed to update tender submission with optimistic lock", map[string]interface{}{
+			"error":         err.Error(),
+			"submission_id": submission.GetID(),
+		})
+		return err
+	}
+	if result.MatchedCount == 0 {
+		return ErrConcurrentUpdate
+	}
+	return nil
+}
+
+func (r *tenderSubmissionRepository) Delete(ctx context.Context, id string) error {
+	if err := r.ormRepo.Delete(ctx, id); err != nil {
+		if errors.Is(err, mongo.ErrDocumentNotFound) {
+			return ErrTenderSubmissionNotFound
+		}
+		r.logger.Error("Failed to delete tender submission", map[string]interface{}{
+			"error":         err.Error(),
+			"submission_id": id,
+		})
+		return err
+	}
+	return nil
+}
+
+func (r *tenderSubmissionRepository) ListByCompany(ctx context.Context, companyID string, statuses []SubmissionStatus, stages []SubmissionStage, from, to *int64, limit, offset int, sortBy, sortOrder string) ([]*TenderSubmission, int64, error) {
+	companyIDPtr := companyID
+	return r.Search(ctx, nil, &companyIDPtr, statuses, stages, from, to, limit, offset, sortBy, sortOrder)
+}
+
+func (r *tenderSubmissionRepository) Search(ctx context.Context, tenderID, companyID *string, statuses []SubmissionStatus, stages []SubmissionStage, from, to *int64, limit, offset int, sortBy, sortOrder string) ([]*TenderSubmission, int64, error) {
+	limit = capListLimit(limit)
+	if offset < 0 {
+		offset = 0
+	}
+
+	filter := bson.M{}
+	if tenderID != nil && *tenderID != "" {
+		filter["tender_id"] = *tenderID
+	}
+	if companyID != nil && *companyID != "" {
+		filter["company_id"] = *companyID
+	}
+	if len(statuses) > 0 {
+		filter["status"] = bson.M{"$in": statuses}
+	}
+	if len(stages) > 0 {
+		filter["stage"] = bson.M{"$in": stages}
+	}
+	if from != nil || to != nil {
+		dateFilter := bson.M{}
+		if from != nil {
+			dateFilter["$gte"] = *from
+		}
+		if to != nil {
+			dateFilter["$lte"] = *to
+		}
+		filter["created_at"] = dateFilter
+	}
+
+	if sortBy == "" {
+		sortBy = "updated_at"
+	}
+	if sortOrder == "" {
+		sortOrder = "desc"
+	}
+
+	pagination := mongo.NewPaginationBuilder().Limit(limit).Skip(offset)
+	if sortOrder == "asc" {
+		pagination = pagination.SortAsc(sortBy)
+	} else {
+		pagination = pagination.SortDesc(sortBy)
+	}
+
+	result, err := r.ormRepo.FindAll(ctx, filter, pagination.Build())
+	if err != nil {
+		r.logger.Error("Failed to search tender submissions", map[string]interface{}{
+			"error": err.Error(),
+		})
+		return nil, 0, err
+	}
+
+	items := make([]*TenderSubmission, len(result.Items))
+	for i := range result.Items {
+		items[i] = &result.Items[i]
+	}
+	return items, result.TotalCount, nil
+}
+
+func (r *tenderSubmissionRepository) GetCompanyStats(ctx context.Context, companyID string) (*CompanySubmissionStatsResponse, error) {
+	pipeline := mongodriver.Pipeline{
+		{{Key: "$match", Value: bson.M{"company_id": companyID}}},
+		{{Key: "$facet", Value: bson.M{
+			"total":     bson.A{bson.M{"$count": "count"}},
+			"by_stage":  bson.A{bson.M{"$group": bson.M{"_id": "$stage", "count": bson.M{"$sum": 1}}}},
+			"by_status": bson.A{bson.M{"$group": bson.M{"_id": "$status", "count": bson.M{"$sum": 1}}}},
+		}}},
+	}
+
+	results, err := r.ormRepo.Aggregate(ctx, pipeline)
+	if err != nil {
+		return nil, err
+	}
+
+	stats := &CompanySubmissionStatsResponse{
+		CompanyID:   companyID,
+		ByStage:     map[string]int64{},
+		ByStatus:    map[string]int64{},
+		LastUpdated: time.Now().Unix(),
+	}
+
+	if len(results) == 0 {
+		return stats, nil
+	}
+
+	facet := results[0]
+	if totalArr, ok := facet["total"].(bson.A); ok && len(totalArr) > 0 {
+		if doc, ok := totalArr[0].(bson.M); ok {
+			stats.Total = int64Value(doc["count"])
+		}
+	}
+	stats.ByStage = countMapFromFacet(facet["by_stage"])
+	stats.ByStatus = countMapFromFacet(facet["by_status"])
+	return stats, nil
+}
+
+func (r *tenderSubmissionRepository) GetGlobalStats(ctx context.Context) (*AdminSubmissionStatsResponse, error) {
+	pipeline := mongodriver.Pipeline{
+		{{Key: "$facet", Value: bson.M{
+			"total":     bson.A{bson.M{"$count": "count"}},
+			"by_stage":  bson.A{bson.M{"$group": bson.M{"_id": "$stage", "count": bson.M{"$sum": 1}}}},
+			"by_status": bson.A{bson.M{"$group": bson.M{"_id": "$status", "count": bson.M{"$sum": 1}}}},
+		}}},
+	}
+
+	results, err := r.ormRepo.Aggregate(ctx, pipeline)
+	if err != nil {
+		return nil, err
+	}
+
+	stats := &AdminSubmissionStatsResponse{
+		ByStage:     map[string]int64{},
+		ByStatus:    map[string]int64{},
+		LastUpdated: time.Now().Unix(),
+	}
+
+	if len(results) == 0 {
+		return stats, nil
+	}
+
+	facet := results[0]
+	if totalArr, ok := facet["total"].(bson.A); ok && len(totalArr) > 0 {
+		if doc, ok := totalArr[0].(bson.M); ok {
+			stats.Total = int64Value(doc["count"])
+		}
+	}
+	stats.ByStage = countMapFromFacet(facet["by_stage"])
+	stats.ByStatus = countMapFromFacet(facet["by_status"])
+	return stats, nil
+}
+
+func countMapFromFacet(raw interface{}) map[string]int64 {
+	out := map[string]int64{}
+	arr, ok := raw.(bson.A)
+	if !ok {
+		return out
+	}
+	for _, item := range arr {
+		doc, ok := item.(bson.M)
+		if !ok {
+			continue
+		}
+		key, _ := doc["_id"].(string)
+		if key == "" {
+			continue
+		}
+		out[key] = int64Value(doc["count"])
+	}
+	return out
+}
+
+func int64Value(v interface{}) int64 {
+	switch n := v.(type) {
+	case int32:
+		return int64(n)
+	case int64:
+		return n
+	case float64:
+		return int64(n)
+	default:
+		return 0
+	}
+}
+
+func capListLimit(limit int) int {
+	if limit <= 0 {
+		return 20
+	}
+	if limit > maxListLimit {
+		return maxListLimit
+	}
+	return limit
+}

internal/tender_submission/service.go

@@ -0,0 +1,451 @@
+package tender_submission
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"tm/internal/tender"
+	"tm/internal/tender_approval"
+	"tm/pkg/logger"
+	"tm/pkg/response"
+)
+
+// TenderApprovalReader verifies that a tender is approved before workflow actions.
+type TenderApprovalReader interface {
+	GetByTenderAndCompany(ctx context.Context, tenderID, companyID string) (*tender_approval.TenderApproval, error)
+}
+
+// Service defines tender submission business logic.
+type Service interface {
+	EnsureForApprovedTender(ctx context.Context, tenderID, companyID, customerID string) (*TenderSubmissionWithTenderResponse, error)
+	GetByIDWithTender(ctx context.Context, id string) (*TenderSubmissionWithTenderResponse, error)
+	GetByIDForCompanyWithTender(ctx context.Context, id, companyID string) (*TenderSubmissionWithTenderResponse, error)
+	GetByTenderAndCompanyWithTender(ctx context.Context, tenderID, companyID string) (*TenderSubmissionWithTenderResponse, error)
+	ListByCompanyWithTender(ctx context.Context, companyID string, form *ListTenderSubmissionsForm) (*TenderSubmissionListResponse, error)
+	UpdateStatus(ctx context.Context, id string, form *UpdateSubmissionStatusForm, companyID, changedBy string) (*TenderSubmissionWithTenderResponse, error)
+	GetCompanyStats(ctx context.Context, companyID string) (*CompanySubmissionStatsResponse, error)
+	GetGlobalStats(ctx context.Context) (*AdminSubmissionStatsResponse, error)
+	AdminListWithTender(ctx context.Context, form *ListTenderSubmissionsForm) (*TenderSubmissionListResponse, error)
+
+	OnApprovalSubmitted(ctx context.Context, tenderID, companyID, customerID string) error
+	OnApprovalRemoved(ctx context.Context, tenderID, companyID string) error
+	OnApprovalRejected(ctx context.Context, tenderID, companyID, changedBy string) error
+}
+
+type tenderSubmissionService struct {
+	repository       Repository
+	approvalReader   TenderApprovalReader
+	tenderService    tender.Service
+	logger           logger.Logger
+}
+
+func NewService(repository Repository, approvalReader TenderApprovalReader, tenderService tender.Service, logger logger.Logger) Service {
+	return &tenderSubmissionService{
+		repository:     repository,
+		approvalReader: approvalReader,
+		tenderService:  tenderService,
+		logger:         logger,
+	}
+}
+
+func (s *tenderSubmissionService) EnsureForApprovedTender(ctx context.Context, tenderID, companyID, customerID string) (*TenderSubmissionWithTenderResponse, error) {
+	resolvedTenderID, err := s.tenderService.ResolveMongoID(ctx, tenderID)
+	if err != nil {
+		s.logger.Warn("Failed to resolve tender for submission ensure", map[string]interface{}{
+			"tender_ref": tenderID,
+			"company_id": companyID,
+			"error":      err.Error(),
+		})
+		return nil, ErrTenderNotFound
+	}
+
+	if err := s.requireSubmittedApproval(ctx, resolvedTenderID, companyID); err != nil {
+		return nil, err
+	}
+
+	submission, err := s.repository.GetByTenderAndCompany(ctx, resolvedTenderID, companyID)
+	if err != nil {
+		if !errors.Is(err, ErrTenderSubmissionNotFound) {
+			return nil, err
+		}
+		submission = NewTenderSubmission(resolvedTenderID, companyID, customerID)
+		if err := s.repository.Create(ctx, submission); err != nil {
+			if !errors.Is(err, ErrTenderSubmissionExists) {
+				return nil, err
+			}
+			submission, err = s.repository.GetByTenderAndCompany(ctx, resolvedTenderID, companyID)
+			if err != nil {
+				return nil, err
+			}
+		}
+	}
+
+	return s.responseWithTender(ctx, submission, true)
+}
+
+func (s *tenderSubmissionService) GetByIDWithTender(ctx context.Context, id string) (*TenderSubmissionWithTenderResponse, error) {
+	submission, err := s.repository.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	return s.responseWithTender(ctx, submission, true)
+}
+
+func (s *tenderSubmissionService) GetByIDForCompanyWithTender(ctx context.Context, id, companyID string) (*TenderSubmissionWithTenderResponse, error) {
+	submission, err := s.repository.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	if submission.CompanyID != companyID {
+		return nil, ErrTenderSubmissionNotFound
+	}
+	return s.responseWithTender(ctx, submission, true)
+}
+
+func (s *tenderSubmissionService) GetByTenderAndCompanyWithTender(ctx context.Context, tenderID, companyID string) (*TenderSubmissionWithTenderResponse, error) {
+	resolvedTenderID, err := s.tenderService.ResolveMongoID(ctx, tenderID)
+	if err != nil {
+		return nil, ErrTenderNotFound
+	}
+
+	submission, err := s.repository.GetByTenderAndCompany(ctx, resolvedTenderID, companyID)
+	if err != nil {
+		return nil, err
+	}
+	return s.responseWithTender(ctx, submission, true)
+}
+
+func (s *tenderSubmissionService) ListByCompanyWithTender(ctx context.Context, companyID string, form *ListTenderSubmissionsForm) (*TenderSubmissionListResponse, error) {
+	limit, offset, sortBy, sortOrder := listParams(form)
+	statuses := parseStatuses(form.Status)
+	stages := parseStages(form.Stage)
+
+	submissions, total, err := s.repository.ListByCompany(ctx, companyID, statuses, stages, form.From, form.To, limit, offset, sortBy, sortOrder)
+	if err != nil {
+		s.logger.Error("Failed to list tender submissions", map[string]interface{}{
+			"company_id": companyID,
+			"error":      err.Error(),
+		})
+		return nil, errors.New("failed to list tender submissions")
+	}
+
+	return &TenderSubmissionListResponse{
+		Submissions: s.enrichSubmissions(ctx, submissions, false),
+		Metadata:    listMetadata(total, limit, offset),
+	}, nil
+}
+
+func (s *tenderSubmissionService) AdminListWithTender(ctx context.Context, form *ListTenderSubmissionsForm) (*TenderSubmissionListResponse, error) {
+	limit, offset, sortBy, sortOrder := listParams(form)
+	statuses := parseStatuses(form.Status)
+	stages := parseStages(form.Stage)
+
+	submissions, total, err := s.repository.Search(ctx, form.TenderID, form.CompanyID, statuses, stages, form.From, form.To, limit, offset, sortBy, sortOrder)
+	if err != nil {
+		s.logger.Error("Failed to admin list tender submissions", map[string]interface{}{
+			"error": err.Error(),
+		})
+		return nil, errors.New("failed to list tender submissions")
+	}
+
+	return &TenderSubmissionListResponse{
+		Submissions: s.enrichSubmissions(ctx, submissions, false),
+		Metadata:    listMetadata(total, limit, offset),
+	}, nil
+}
+
+func (s *tenderSubmissionService) UpdateStatus(ctx context.Context, id string, form *UpdateSubmissionStatusForm, companyID, changedBy string) (*TenderSubmissionWithTenderResponse, error) {
+	s.logger.Info("Updating tender submission status", map[string]interface{}{
+		"submission_id": id,
+		"company_id":    companyID,
+		"new_status":    form.Status,
+		"changed_by":    changedBy,
+	})
+
+	submission, err := s.repository.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+
+	if companyID != "" && submission.CompanyID != companyID {
+		return nil, ErrTenderSubmissionNotFound
+	}
+
+	expectedUpdatedAt := submission.UpdatedAt
+	if err := s.validateStatusTransition(submission.Status, form.Status); err != nil {
+		s.logger.Error("Invalid tender submission status transition", map[string]interface{}{
+			"submission_id":  id,
+			"current_status": submission.Status,
+			"new_status":     form.Status,
+			"error":          err.Error(),
+		})
+		return nil, err
+	}
+
+	submission.AddStatusChange(form.Status, form.Reason, changedBy, form.Description)
+	if err := s.repository.UpdateIfUpdatedAt(ctx, submission, expectedUpdatedAt); err != nil {
+		if errors.Is(err, ErrConcurrentUpdate) {
+			return nil, ErrConcurrentUpdate
+		}
+		return nil, errors.New("failed to update tender submission status")
+	}
+
+	s.logger.Info("Tender submission status updated", map[string]interface{}{
+		"submission_id": id,
+		"status":        submission.Status,
+		"stage":         submission.Stage,
+	})
+
+	return s.responseWithTender(ctx, submission, true)
+}
+
+func (s *tenderSubmissionService) GetCompanyStats(ctx context.Context, companyID string) (*CompanySubmissionStatsResponse, error) {
+	stats, err := s.repository.GetCompanyStats(ctx, companyID)
+	if err != nil {
+		s.logger.Error("Failed to get company submission stats", map[string]interface{}{
+			"company_id": companyID,
+			"error":      err.Error(),
+		})
+		return nil, errors.New("failed to get submission statistics")
+	}
+	return stats, nil
+}
+
+func (s *tenderSubmissionService) GetGlobalStats(ctx context.Context) (*AdminSubmissionStatsResponse, error) {
+	stats, err := s.repository.GetGlobalStats(ctx)
+	if err != nil {
+		s.logger.Error("Failed to get global submission stats", map[string]interface{}{
+			"error": err.Error(),
+		})
+		return nil, errors.New("failed to get submission statistics")
+	}
+	return stats, nil
+}
+
+func (s *tenderSubmissionService) OnApprovalSubmitted(ctx context.Context, tenderID, companyID, customerID string) error {
+	existing, err := s.repository.GetByTenderAndCompany(ctx, tenderID, companyID)
+	if err != nil && !errors.Is(err, ErrTenderSubmissionNotFound) {
+		return err
+	}
+	if existing != nil {
+		if IsTerminalStatus(existing.Status) {
+			existing.ReopenForApproval(customerID, "Tender re-approved")
+			return s.repository.Update(ctx, existing)
+		}
+		return nil
+	}
+
+	submission := NewTenderSubmission(tenderID, companyID, customerID)
+	if err := s.repository.Create(ctx, submission); err != nil {
+		if errors.Is(err, ErrTenderSubmissionExists) {
+			existing, getErr := s.repository.GetByTenderAndCompany(ctx, tenderID, companyID)
+			if getErr != nil {
+				return getErr
+			}
+			if IsTerminalStatus(existing.Status) {
+				existing.ReopenForApproval(customerID, "Tender re-approved")
+				return s.repository.Update(ctx, existing)
+			}
+			return nil
+		}
+		s.logger.Error("Failed to create submission on approval", map[string]interface{}{
+			"tender_id":  tenderID,
+			"company_id": companyID,
+			"error":      err.Error(),
+		})
+		return err
+	}
+
+	s.logger.Info("Submission workflow created from approval", map[string]interface{}{
+		"tender_id":  tenderID,
+		"company_id": companyID,
+	})
+	return nil
+}
+
+func (s *tenderSubmissionService) OnApprovalRemoved(ctx context.Context, tenderID, companyID string) error {
+	submission, err := s.repository.GetByTenderAndCompany(ctx, tenderID, companyID)
+	if err != nil {
+		if errors.Is(err, ErrTenderSubmissionNotFound) {
+			return nil
+		}
+		return err
+	}
+
+	if submission.Status != StatusOpportunity {
+		return nil
+	}
+
+	if err := s.repository.Delete(ctx, submission.GetID()); err != nil {
+		s.logger.Error("Failed to remove opportunity submission after approval toggle", map[string]interface{}{
+			"submission_id": submission.GetID(),
+			"error":         err.Error(),
+		})
+		return err
+	}
+	return nil
+}
+
+func (s *tenderSubmissionService) OnApprovalRejected(ctx context.Context, tenderID, companyID, changedBy string) error {
+	submission, err := s.repository.GetByTenderAndCompany(ctx, tenderID, companyID)
+	if err != nil {
+		if errors.Is(err, ErrTenderSubmissionNotFound) {
+			return nil
+		}
+		return err
+	}
+
+	if IsTerminalStatus(submission.Status) {
+		return nil
+	}
+
+	if err := s.transitionSubmission(submission, StatusNotApplied, "approval_rejected", changedBy, "Tender approval was rejected"); err != nil {
+		var transitionErr *InvalidStatusTransitionError
+		if errors.Is(err, ErrTerminalStatus) || errors.As(err, &transitionErr) {
+			s.logger.Warn("Skipping approval rejection sync due to invalid transition", map[string]interface{}{
+				"tender_id":      tenderID,
+				"company_id":     companyID,
+				"current_status": submission.Status,
+				"target_status":  StatusNotApplied,
+			})
+			return nil
+		}
+		return err
+	}
+	return s.repository.Update(ctx, submission)
+}
+
+func (s *tenderSubmissionService) transitionSubmission(submission *TenderSubmission, next SubmissionStatus, reason, changedBy, description string) error {
+	if err := s.validateStatusTransition(submission.Status, next); err != nil {
+		return err
+	}
+	submission.AddStatusChange(next, reason, changedBy, description)
+	return nil
+}
+
+func (s *tenderSubmissionService) requireSubmittedApproval(ctx context.Context, tenderID, companyID string) error {
+	approval, err := s.approvalReader.GetByTenderAndCompany(ctx, tenderID, companyID)
+	if err != nil {
+		if errors.Is(err, tender_approval.ErrTenderApprovalNotFound) {
+			return ErrApprovalRequired
+		}
+		return err
+	}
+	if approval.Status != tender_approval.ApprovalStatusSubmitted {
+		return ErrApprovalRequired
+	}
+	return nil
+}
+
+func (s *tenderSubmissionService) validateStatusTransition(current, next SubmissionStatus) error {
+	if IsTerminalStatus(current) {
+		return ErrTerminalStatus
+	}
+
+	for _, allowed := range AllowedNextStatuses(current) {
+		if allowed == next {
+			return nil
+		}
+	}
+
+	allowed := AllowedNextStatuses(current)
+	allowedStrings := make([]string, len(allowed))
+	for i, status := range allowed {
+		allowedStrings[i] = string(status)
+	}
+	return NewInvalidStatusTransitionError(string(current), string(next), allowedStrings)
+}
+
+func (s *tenderSubmissionService) responseWithTender(ctx context.Context, submission *TenderSubmission, fullDetails bool) (*TenderSubmissionWithTenderResponse, error) {
+	tenderResp, err := s.tenderService.GetByID(ctx, submission.TenderID, "")
+	if err != nil {
+		s.logger.Warn("Failed to load tender for submission response", map[string]interface{}{
+			"tender_id": submission.TenderID,
+			"error":     err.Error(),
+		})
+		return submission.ToResponseWithTender(nil), nil
+	}
+
+	var details *TenderDetails
+	if fullDetails {
+		details = fullTenderDetailsFromResponse(tenderResp)
+	} else {
+		details = listTenderDetailsFromResponse(tenderResp)
+	}
+	return submission.ToResponseWithTender(details), nil
+}
+
+func listParams(form *ListTenderSubmissionsForm) (limit, offset int, sortBy, sortOrder string) {
+	limit = 20
+	offset = 0
+	sortBy = "updated_at"
+	sortOrder = "desc"
+
+	if form == nil {
+		return limit, offset, sortBy, sortOrder
+	}
+	if form.Limit != nil && *form.Limit > 0 {
+		limit = *form.Limit
+	}
+	if limit > maxListLimit {
+		limit = maxListLimit
+	}
+	if form.Offset != nil && *form.Offset >= 0 {
+		offset = *form.Offset
+	}
+	if form.SortBy != nil && strings.TrimSpace(*form.SortBy) != "" {
+		sortBy = strings.TrimSpace(*form.SortBy)
+	}
+	if form.SortOrder != nil && strings.TrimSpace(*form.SortOrder) != "" {
+		sortOrder = strings.TrimSpace(*form.SortOrder)
+	}
+	return limit, offset, sortBy, sortOrder
+}
+
+func parseStatuses(values []string) []SubmissionStatus {
+	if len(values) == 0 {
+		return nil
+	}
+	out := make([]SubmissionStatus, 0, len(values))
+	for _, value := range values {
+		value = strings.TrimSpace(value)
+		if value == "" {
+			continue
+		}
+		out = append(out, SubmissionStatus(value))
+	}
+	return out
+}
+
+func parseStages(values []string) []SubmissionStage {
+	if len(values) == 0 {
+		return nil
+	}
+	out := make([]SubmissionStage, 0, len(values))
+	for _, value := range values {
+		value = strings.TrimSpace(value)
+		if value == "" {
+			continue
+		}
+		out = append(out, SubmissionStage(value))
+	}
+	return out
+}
+
+func listMetadata(total int64, limit, offset int) *response.Meta {
+	pages := int(total) / limit
+	if limit > 0 && int(total)%limit > 0 {
+		pages++
+	}
+	page := 1
+	if limit > 0 {
+		page = (offset / limit) + 1
+	}
+	return &response.Meta{
+		Total:  int(total),
+		Limit:  limit,
+		Offset: offset,
+		Page:   page,
+		Pages:  pages,
+	}
+}

internal/tender_submission/service_test.go

@@ -0,0 +1,261 @@
+package tender_submission
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"tm/pkg/logger"
+)
+
+type mockRepository struct {
+	byTenderCompany map[string]*TenderSubmission
+	createErr       error
+	updateErr       error
+	deleteErr       error
+}
+
+func submissionKey(tenderID, companyID string) string {
+	return tenderID + ":" + companyID
+}
+
+func newMockRepository() *mockRepository {
+	return &mockRepository{byTenderCompany: map[string]*TenderSubmission{}}
+}
+
+func (m *mockRepository) Create(_ context.Context, submission *TenderSubmission) error {
+	if m.createErr != nil {
+		return m.createErr
+	}
+	key := submissionKey(submission.TenderID, submission.CompanyID)
+	if _, exists := m.byTenderCompany[key]; exists {
+		return ErrTenderSubmissionExists
+	}
+	copy := *submission
+	m.byTenderCompany[key] = &copy
+	return nil
+}
+
+func (m *mockRepository) GetByID(_ context.Context, id string) (*TenderSubmission, error) {
+	for _, submission := range m.byTenderCompany {
+		if submission.GetID() == id {
+			copy := *submission
+			return &copy, nil
+		}
+	}
+	return nil, ErrTenderSubmissionNotFound
+}
+
+func (m *mockRepository) GetByTenderAndCompany(_ context.Context, tenderID, companyID string) (*TenderSubmission, error) {
+	submission, ok := m.byTenderCompany[submissionKey(tenderID, companyID)]
+	if !ok {
+		return nil, ErrTenderSubmissionNotFound
+	}
+	copy := *submission
+	return &copy, nil
+}
+
+func (m *mockRepository) Update(_ context.Context, submission *TenderSubmission) error {
+	if m.updateErr != nil {
+		return m.updateErr
+	}
+	key := submissionKey(submission.TenderID, submission.CompanyID)
+	if _, ok := m.byTenderCompany[key]; !ok {
+		return ErrTenderSubmissionNotFound
+	}
+	copy := *submission
+	m.byTenderCompany[key] = &copy
+	return nil
+}
+
+func (m *mockRepository) UpdateIfUpdatedAt(ctx context.Context, submission *TenderSubmission, expectedUpdatedAt int64) error {
+	current, err := m.GetByTenderAndCompany(ctx, submission.TenderID, submission.CompanyID)
+	if err != nil {
+		return err
+	}
+	if current.UpdatedAt != expectedUpdatedAt {
+		return ErrConcurrentUpdate
+	}
+	return m.Update(ctx, submission)
+}
+
+func (m *mockRepository) Delete(_ context.Context, id string) error {
+	if m.deleteErr != nil {
+		return m.deleteErr
+	}
+	for key, submission := range m.byTenderCompany {
+		if submission.GetID() == id {
+			delete(m.byTenderCompany, key)
+			return nil
+		}
+	}
+	return ErrTenderSubmissionNotFound
+}
+
+func (m *mockRepository) ListByCompany(context.Context, string, []SubmissionStatus, []SubmissionStage, *int64, *int64, int, int, string, string) ([]*TenderSubmission, int64, error) {
+	return nil, 0, nil
+}
+
+func (m *mockRepository) Search(context.Context, *string, *string, []SubmissionStatus, []SubmissionStage, *int64, *int64, int, int, string, string) ([]*TenderSubmission, int64, error) {
+	return nil, 0, nil
+}
+
+func (m *mockRepository) GetCompanyStats(context.Context, string) (*CompanySubmissionStatsResponse, error) {
+	return nil, nil
+}
+
+func (m *mockRepository) GetGlobalStats(context.Context) (*AdminSubmissionStatsResponse, error) {
+	return nil, nil
+}
+
+func (m *mockRepository) seed(submission *TenderSubmission) {
+	copy := *submission
+	m.byTenderCompany[submissionKey(submission.TenderID, submission.CompanyID)] = &copy
+}
+
+func newTestService(repo Repository) *tenderSubmissionService {
+	return &tenderSubmissionService{
+		repository:     repo,
+		approvalReader: nil,
+		tenderService:  nil,
+		logger:         testLogger{},
+	}
+}
+
+type testLogger struct{}
+
+func (testLogger) Debug(string, map[string]interface{}) {}
+func (testLogger) Info(string, map[string]interface{})  {}
+func (testLogger) Warn(string, map[string]interface{})  {}
+func (testLogger) Error(string, map[string]interface{}) {}
+func (testLogger) Fatal(string, map[string]interface{}) {}
+func (testLogger) WithFields(map[string]interface{}) logger.Logger {
+	return testLogger{}
+}
+func (testLogger) Sync() error { return nil }
+
+func TestOnApprovalSubmittedReopensTerminalSubmission(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	existing := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	existing.AddStatusChange(StatusNotApplied, "approval_rejected", "customer-1", "Rejected")
+	repo.seed(existing)
+
+	if err := service.OnApprovalSubmitted(context.Background(), "tender-1", "company-1", "customer-2"); err != nil {
+		t.Fatalf("OnApprovalSubmitted() error = %v", err)
+	}
+
+	updated, err := repo.GetByTenderAndCompany(context.Background(), "tender-1", "company-1")
+	if err != nil {
+		t.Fatalf("GetByTenderAndCompany() error = %v", err)
+	}
+	if updated.Status != StatusOpportunity {
+		t.Fatalf("status = %q, want %q", updated.Status, StatusOpportunity)
+	}
+}
+
+func TestOnApprovalSubmittedCreatesWhenMissing(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	if err := service.OnApprovalSubmitted(context.Background(), "tender-1", "company-1", "customer-1"); err != nil {
+		t.Fatalf("OnApprovalSubmitted() error = %v", err)
+	}
+
+	created, err := repo.GetByTenderAndCompany(context.Background(), "tender-1", "company-1")
+	if err != nil {
+		t.Fatalf("GetByTenderAndCompany() error = %v", err)
+	}
+	if created.Status != StatusOpportunity {
+		t.Fatalf("status = %q, want %q", created.Status, StatusOpportunity)
+	}
+}
+
+func TestOnApprovalRejectedUsesValidatedTransition(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	existing := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	existing.AddStatusChange(StatusValidating, "", "customer-1", "Accepted")
+	repo.seed(existing)
+
+	if err := service.OnApprovalRejected(context.Background(), "tender-1", "company-1", "customer-1"); err != nil {
+		t.Fatalf("OnApprovalRejected() error = %v", err)
+	}
+
+	updated, err := repo.GetByTenderAndCompany(context.Background(), "tender-1", "company-1")
+	if err != nil {
+		t.Fatalf("GetByTenderAndCompany() error = %v", err)
+	}
+	if updated.Status != StatusNotApplied {
+		t.Fatalf("status = %q, want %q", updated.Status, StatusNotApplied)
+	}
+}
+
+func TestOnApprovalRejectedSkipsInvalidTransitionFromSentWaiting(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	existing := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	existing.AddStatusChange(StatusValidating, "", "customer-1", "Accepted")
+	existing.AddStatusChange(StatusApplying, "", "customer-1", "Ready")
+	existing.AddStatusChange(StatusSentWaiting, "", "customer-1", "Submitted")
+	repo.seed(existing)
+
+	if err := service.OnApprovalRejected(context.Background(), "tender-1", "company-1", "customer-1"); err != nil {
+		t.Fatalf("OnApprovalRejected() error = %v", err)
+	}
+
+	updated, err := repo.GetByTenderAndCompany(context.Background(), "tender-1", "company-1")
+	if err != nil {
+		t.Fatalf("GetByTenderAndCompany() error = %v", err)
+	}
+	if updated.Status != StatusSentWaiting {
+		t.Fatalf("status = %q, want %q", updated.Status, StatusSentWaiting)
+	}
+}
+
+func TestOnApprovalRemovedDeletesOpportunityOnly(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	opportunity := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	repo.seed(opportunity)
+
+	if err := service.OnApprovalRemoved(context.Background(), "tender-1", "company-1"); err != nil {
+		t.Fatalf("OnApprovalRemoved() error = %v", err)
+	}
+	if _, err := repo.GetByTenderAndCompany(context.Background(), "tender-1", "company-1"); !errors.Is(err, ErrTenderSubmissionNotFound) {
+		t.Fatalf("expected submission to be deleted, got err = %v", err)
+	}
+
+	inProgress := NewTenderSubmission("tender-2", "company-1", "customer-1")
+	inProgress.AddStatusChange(StatusValidating, "", "customer-1", "Accepted")
+	repo.seed(inProgress)
+
+	if err := service.OnApprovalRemoved(context.Background(), "tender-2", "company-1"); err != nil {
+		t.Fatalf("OnApprovalRemoved() error = %v", err)
+	}
+
+	updated, err := repo.GetByTenderAndCompany(context.Background(), "tender-2", "company-1")
+	if err != nil {
+		t.Fatalf("GetByTenderAndCompany() error = %v", err)
+	}
+	if updated.Status != StatusValidating {
+		t.Fatalf("status = %q, want %q", updated.Status, StatusValidating)
+	}
+}
+
+func TestGetByIDForCompanyWithTenderEnforcesOwnership(t *testing.T) {
+	repo := newMockRepository()
+	service := newTestService(repo)
+
+	submission := NewTenderSubmission("tender-1", "company-1", "customer-1")
+	repo.seed(submission)
+
+	_, err := service.GetByIDForCompanyWithTender(context.Background(), submission.GetID(), "company-2")
+	if !errors.Is(err, ErrTenderSubmissionNotFound) {
+		t.Fatalf("expected not found for other company, got %v", err)
+	}
+}

internal/tender_submission/tender_details.go

@@ -0,0 +1,110 @@
+package tender_submission
+
+import (
+	"context"
+
+	"tm/internal/tender"
+)
+
+func listTenderDetailsFromResponse(resp *tender.TenderResponse) *TenderDetails {
+	if resp == nil {
+		return nil
+	}
+
+	details := &TenderDetails{
+		ID:                 resp.ID,
+		Title:              resp.Title,
+		Description:        resp.Description,
+		EstimatedValue:     resp.EstimatedValue,
+		Currency:           resp.Currency,
+		TenderDeadline:     resp.TenderDeadline,
+		SubmissionDeadline: resp.SubmissionDeadline,
+		CountryCode:        resp.CountryCode,
+		Status:             string(resp.Status),
+	}
+	if resp.BuyerOrganization != nil && resp.BuyerOrganization.Name != "" {
+		details.BuyerOrganization = &OrganizationResponse{Name: resp.BuyerOrganization.Name}
+	}
+	return details
+}
+
+func fullTenderDetailsFromResponse(resp *tender.TenderResponse) *TenderDetails {
+	if resp == nil {
+		return nil
+	}
+
+	details := &TenderDetails{
+		ID:                  resp.ID,
+		NoticePublicationID: resp.NoticePublicationID,
+		PublicationDate:     resp.PublicationDate,
+		Title:               resp.Title,
+		Description:         resp.Description,
+		ProcurementTypeCode: resp.ProcurementTypeCode,
+		ProcedureCode:       resp.ProcedureCode,
+		EstimatedValue:      resp.EstimatedValue,
+		Currency:            resp.Currency,
+		Duration:            resp.Duration,
+		DurationUnit:        resp.DurationUnit,
+		TenderDeadline:      resp.TenderDeadline,
+		SubmissionDeadline:  resp.SubmissionDeadline,
+		CountryCode:         resp.CountryCode,
+		Status:              string(resp.Status),
+	}
+	if resp.BuyerOrganization != nil && resp.BuyerOrganization.Name != "" {
+		details.BuyerOrganization = &OrganizationResponse{Name: resp.BuyerOrganization.Name}
+	}
+	return details
+}
+
+func uniqueTenderIDs(submissions []*TenderSubmission) []string {
+	if len(submissions) == 0 {
+		return nil
+	}
+
+	seen := make(map[string]struct{}, len(submissions))
+	ids := make([]string, 0, len(submissions))
+	for _, submission := range submissions {
+		if submission == nil || submission.TenderID == "" {
+			continue
+		}
+		if _, ok := seen[submission.TenderID]; ok {
+			continue
+		}
+		seen[submission.TenderID] = struct{}{}
+		ids = append(ids, submission.TenderID)
+	}
+	return ids
+}
+
+func (s *tenderSubmissionService) loadTendersByIDs(ctx context.Context, tenderIDs []string) map[string]*tender.TenderResponse {
+	if len(tenderIDs) == 0 {
+		return map[string]*tender.TenderResponse{}
+	}
+
+	tenders, err := s.tenderService.GetByIDs(ctx, tenderIDs)
+	if err != nil {
+		s.logger.Error("Failed to batch load tenders for submissions", map[string]interface{}{
+			"count": len(tenderIDs),
+			"error": err.Error(),
+		})
+		return map[string]*tender.TenderResponse{}
+	}
+	return tenders
+}
+
+func (s *tenderSubmissionService) enrichSubmissions(ctx context.Context, submissions []*TenderSubmission, fullDetails bool) []*TenderSubmissionWithTenderResponse {
+	tenderMap := s.loadTendersByIDs(ctx, uniqueTenderIDs(submissions))
+	responses := make([]*TenderSubmissionWithTenderResponse, len(submissions))
+	for i, submission := range submissions {
+		var details *TenderDetails
+		if tenderResp, ok := tenderMap[submission.TenderID]; ok {
+			if fullDetails {
+				details = fullTenderDetailsFromResponse(tenderResp)
+			} else {
+				details = listTenderDetailsFromResponse(tenderResp)
+			}
+		}
+		responses[i] = submission.ToResponseWithTender(details)
+	}
+	return responses
+}