package tender

import (
	"strconv"
	"strings"
	"tm/pkg/logger"
	"tm/pkg/response"

	"github.com/asaskevich/govalidator"
	"github.com/labstack/echo/v4"
)

// TenderHandler handles tender-related HTTP requests
type TenderHandler struct {
	service TenderService
	logger  logger.Logger
}

// NewTenderHandler creates a new tender handler
func NewTenderHandler(service TenderService, logger logger.Logger) *TenderHandler {
	return &TenderHandler{
		service: service,
		logger:  logger,
	}
}

// CreateTender creates a new tender
// @Summary Create a new tender
// @Description Create a new tender with the provided information
// @Tags Admin-Tenders
// @Accept json
// @Produce json
// @Param tender body CreateTenderRequest true "Tender information"
// @Success 201 {object} response.APIResponse{data=TenderResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 409 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders [post]
// @Security BearerAuth
func (h *TenderHandler) CreateTender(c echo.Context) error {
	var req CreateTenderRequest
	if err := c.Bind(&req); err != nil {
		return response.ValidationError(c, "Invalid request format", err.Error())
	}

	if _, err := govalidator.ValidateStruct(req); err != nil {
		return response.ValidationError(c, "Validation failed", err.Error())
	}

	tender, err := h.service.CreateTender(c.Request().Context(), req)
	if err != nil {
		if err.Error() == "tender with notice publication ID already exists" {
			return response.Conflict(c, "Tender already exists")
		}
		return response.InternalServerError(c, "Failed to create tender")
	}

	return response.Created(c, tender.ToTenderResponse(), "Tender created successfully")
}

// GetTender retrieves a tender by ID
// @Summary Get tender by ID
// @Description Retrieve a specific tender by its ID
// @Tags Admin-Tenders
// @Produce json
// @Param id path string true "Tender ID"
// @Success 200 {object} response.APIResponse{data=TenderResponse}
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/{id} [get]
// @Security BearerAuth
func (h *TenderHandler) GetTender(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Tender ID is required", "ID parameter cannot be empty")
	}

	tender, err := h.service.GetTenderByID(c.Request().Context(), id)
	if err != nil {
		return response.NotFound(c, "Tender not found")
	}

	return response.Success(c, tender.ToTenderResponse(), "Tender retrieved successfully")
}

// UpdateTender updates an existing tender
// @Summary Update tender
// @Description Update an existing tender with the provided information
// @Tags Admin-Tenders
// @Accept json
// @Produce json
// @Param id path string true "Tender ID"
// @Param tender body UpdateTenderRequest true "Updated tender information"
// @Success 200 {object} response.APIResponse{data=TenderResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/{id} [put]
// @Security BearerAuth
func (h *TenderHandler) UpdateTender(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Tender ID is required", "ID parameter cannot be empty")
	}

	var req UpdateTenderRequest
	if err := c.Bind(&req); err != nil {
		return response.ValidationError(c, "Invalid request format", err.Error())
	}

	req.ID = id

	if _, err := govalidator.ValidateStruct(req); err != nil {
		return response.ValidationError(c, "Validation failed", err.Error())
	}

	tender, err := h.service.UpdateTender(c.Request().Context(), req)
	if err != nil {
		if err.Error() == "tender not found" {
			return response.NotFound(c, "Tender not found")
		}
		return response.InternalServerError(c, "Failed to update tender")
	}

	return response.Success(c, tender.ToTenderResponse(), "Tender updated successfully")
}

// DeleteTender deletes a tender
// @Summary Delete tender
// @Description Delete a tender by its ID
// @Tags Admin-Tenders
// @Param id path string true "Tender ID"
// @Success 200 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/{id} [delete]
// @Security BearerAuth
func (h *TenderHandler) DeleteTender(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Tender ID is required", "ID parameter cannot be empty")
	}

	err := h.service.DeleteTender(c.Request().Context(), id)
	if err != nil {
		if err.Error() == "tender not found" {
			return response.NotFound(c, "Tender not found")
		}
		return response.InternalServerError(c, "Failed to delete tender")
	}

	return response.Success(c, map[string]interface{}{"deleted": true}, "Tender deleted successfully")
}

// ListTenders retrieves tenders with pagination and filtering
// @Summary List tenders
// @Description Retrieve tenders with pagination, filtering, and search capabilities with optional company-based matching
// @Tags Admin-Tenders
// @Produce json
// @Param limit query int false "Number of items per page (default: 20, max: 100)"
// @Param offset query int false "Number of items to skip (default: 0)"
// @Param company_id query string false "Company ID for match percentage calculation and sorting"
// @Param query query string false "Search query for title and description"
// @Param notice_type query string false "Filter by notice type code"
// @Param procurement_type query string false "Filter by procurement type code"
// @Param country_codes query []string false "Filter by country codes (comma-separated)"
// @Param status query []string false "Filter by status (comma-separated)"
// @Param source query []string false "Filter by source (comma-separated)"
// @Param min_estimated_value query number false "Minimum estimated value"
// @Param max_estimated_value query number false "Maximum estimated value"
// @Param currency query string false "Filter by currency"
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders [get]
// @Security BearerAuth
func (h *TenderHandler) ListTenders(c echo.Context) error {
	// Parse pagination parameters
	limit := 20
	if l := c.QueryParam("limit"); l != "" {
		if parsed, err := strconv.Atoi(l); err == nil && parsed > 0 && parsed <= 100 {
			limit = parsed
		}
	}

	offset := 0
	if o := c.QueryParam("offset"); o != "" {
		if parsed, err := strconv.Atoi(o); err == nil && parsed >= 0 {
			offset = parsed
		}
	}

	// Build search criteria
	criteria := TenderSearchCriteria{
		Query:           c.QueryParam("query"),
		NoticeType:      c.QueryParam("notice_type"),
		ProcurementType: c.QueryParam("procurement_type"),
		Currency:        c.QueryParam("currency"),
	}

	// Parse array parameters
	if countryCodes := c.QueryParam("country_codes"); countryCodes != "" {
		criteria.CountryCodes = parseStringArray(countryCodes)
	}

	if statuses := c.QueryParam("status"); statuses != "" {
		statusStrings := parseStringArray(statuses)
		criteria.Status = make([]TenderStatus, len(statusStrings))
		for i, s := range statusStrings {
			criteria.Status[i] = TenderStatus(s)
		}
	}

	if sources := c.QueryParam("source"); sources != "" {
		sourceStrings := parseStringArray(sources)
		criteria.Source = make([]TenderSource, len(sourceStrings))
		for i, s := range sourceStrings {
			criteria.Source[i] = TenderSource(s)
		}
	}

	// Parse numeric parameters
	if minValue := c.QueryParam("min_estimated_value"); minValue != "" {
		if parsed, err := strconv.ParseFloat(minValue, 64); err == nil {
			criteria.MinEstimatedValue = &parsed
		}
	}

	if maxValue := c.QueryParam("max_estimated_value"); maxValue != "" {
		if parsed, err := strconv.ParseFloat(maxValue, 64); err == nil {
			criteria.MaxEstimatedValue = &parsed
		}
	}

	// Parse company_id parameter for matching
	var companyID *string
	if companyIDParam := c.QueryParam("company_id"); companyIDParam != "" {
		companyID = &companyIDParam
	}

	req := ListTendersRequest{
		Criteria:  criteria,
		Limit:     limit,
		Offset:    offset,
		CompanyID: companyID,
	}

	result, err := h.service.ListTenders(c.Request().Context(), req)
	if err != nil {
		return response.InternalServerError(c, "Failed to retrieve tenders")
	}

	responseData := map[string]interface{}{
		"tenders": result.Tenders,
		"total":   result.Total,
		"limit":   result.Limit,
		"offset":  result.Offset,
	}

	return response.Success(c, responseData, "Tenders retrieved successfully")
}

// SearchTenders searches tenders
// @Summary Search tenders
// @Description Search tenders using full-text search and filtering
// @Tags Admin-Tenders
// @Accept json
// @Produce json
// @Param search body SearchTendersRequest true "Search criteria"
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/search [post]
// @Security BearerAuth
func (h *TenderHandler) SearchTenders(c echo.Context) error {
	var req SearchTendersRequest
	if err := c.Bind(&req); err != nil {
		return response.ValidationError(c, "Invalid request format", err.Error())
	}

	if _, err := govalidator.ValidateStruct(req); err != nil {
		return response.ValidationError(c, "Validation failed", err.Error())
	}

	result, err := h.service.SearchTenders(c.Request().Context(), req)
	if err != nil {
		return response.InternalServerError(c, "Failed to search tenders")
	}

	// Convert tenders to response format
	tenderResponses := make([]TenderResponse, len(result.Tenders))
	for i, tender := range result.Tenders {
		tenderResponses[i] = *tender.ToTenderResponse()
	}

	responseData := map[string]interface{}{
		"tenders": tenderResponses,
		"query":   result.Query,
		"total":   result.Total,
	}

	return response.Success(c, responseData, "Tenders found successfully")
}

// GetTenderStatistics retrieves tender statistics
// @Summary Get tender statistics
// @Description Retrieve comprehensive statistics about tenders
// @Tags Admin-Tenders
// @Produce json
// @Success 200 {object} response.APIResponse{data=TenderStatistics}
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/statistics [get]
// @Security BearerAuth
func (h *TenderHandler) GetTenderStatistics(c echo.Context) error {
	stats, err := h.service.GetTenderStatistics(c.Request().Context())
	if err != nil {
		return response.InternalServerError(c, "Failed to retrieve statistics")
	}

	return response.Success(c, stats, "Statistics retrieved successfully")
}

// GetDashboard retrieves dashboard data
// @Summary Get dashboard data
// @Description Retrieve dashboard data including statistics, recent tenders, and active jobs
// @Tags Admin-Tenders
// @Produce json
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 500 {object} response.APIResponse
// @Router /admin/tenders/dashboard [get]
// @Security BearerAuth
func (h *TenderHandler) GetDashboard(c echo.Context) error {
	dashboard, err := h.service.GetDashboardData(c.Request().Context())
	if err != nil {
		return response.InternalServerError(c, "Failed to retrieve dashboard data")
	}

	// Convert recent tenders to response format
	recentTenderResponses := make([]TenderResponse, len(dashboard.RecentTenders))
	for i, tender := range dashboard.RecentTenders {
		recentTenderResponses[i] = *tender.ToTenderResponse()
	}

	// Convert active jobs to response format
	activeJobResponses := make([]ScrapingJobResponse, len(dashboard.ActiveJobs))
	for i, job := range dashboard.ActiveJobs {
		activeJobResponses[i] = *job.ToScrapingJobResponse()
	}

	responseData := map[string]interface{}{
		"statistics":     dashboard.Statistics,
		"recent_tenders": recentTenderResponses,
		"active_jobs":    activeJobResponses,
	}

	return response.Success(c, responseData, "Dashboard data retrieved successfully")
}

// StartScrapingJob starts a new scraping job
// @Summary Start scraping job
// @Description Start a new TED XML scraping job
// @Tags Admin-Scraping
// @Accept json
// @Produce json
// @Param job body StartScrapingJobRequest true "Scraping job configuration"
// @Success 201 {object} response.APIResponse{data=ScrapingJobResponse}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/scraping/jobs [post]
// @Security BearerAuth
func (h *TenderHandler) StartScrapingJob(c echo.Context) error {
	var req StartScrapingJobRequest
	if err := c.Bind(&req); err != nil {
		return response.ValidationError(c, "Invalid request format", err.Error())
	}

	if _, err := govalidator.ValidateStruct(req); err != nil {
		return response.ValidationError(c, "Validation failed", err.Error())
	}

	job, err := h.service.StartScrapingJob(c.Request().Context(), req)
	if err != nil {
		return response.InternalServerError(c, "Failed to start scraping job")
	}

	return response.Created(c, job.ToScrapingJobResponse(), "Scraping job started successfully")
}

// GetScrapingJob retrieves a scraping job by ID
// @Summary Get scraping job
// @Description Retrieve a specific scraping job by its ID
// @Tags Admin-Scraping
// @Produce json
// @Param id path string true "Scraping job ID"
// @Success 200 {object} response.APIResponse{data=ScrapingJobResponse}
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/scraping/jobs/{id} [get]
// @Security BearerAuth
func (h *TenderHandler) GetScrapingJob(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Scraping job ID is required", "ID parameter cannot be empty")
	}

	job, err := h.service.GetScrapingJobStatus(c.Request().Context(), id)
	if err != nil {
		return response.NotFound(c, "Scraping job not found")
	}

	return response.Success(c, job.ToScrapingJobResponse(), "Scraping job retrieved successfully")
}

// ListScrapingJobs retrieves scraping jobs with pagination
// @Summary List scraping jobs
// @Description Retrieve scraping jobs with pagination
// @Tags Admin-Scraping
// @Produce json
// @Param limit query int false "Number of items per page (default: 20, max: 100)"
// @Param offset query int false "Number of items to skip (default: 0)"
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/scraping/jobs [get]
// @Security BearerAuth
func (h *TenderHandler) ListScrapingJobs(c echo.Context) error {
	// Parse pagination parameters
	limit := 20
	if l := c.QueryParam("limit"); l != "" {
		if parsed, err := strconv.Atoi(l); err == nil && parsed > 0 && parsed <= 100 {
			limit = parsed
		}
	}

	offset := 0
	if o := c.QueryParam("offset"); o != "" {
		if parsed, err := strconv.Atoi(o); err == nil && parsed >= 0 {
			offset = parsed
		}
	}

	req := ListScrapingJobsRequest{
		Limit:  limit,
		Offset: offset,
	}

	result, err := h.service.ListScrapingJobs(c.Request().Context(), req)
	if err != nil {
		return response.InternalServerError(c, "Failed to retrieve scraping jobs")
	}

	// Convert jobs to response format
	jobResponses := make([]ScrapingJobResponse, len(result.Jobs))
	for i, job := range result.Jobs {
		jobResponses[i] = *job.ToScrapingJobResponse()
	}

	responseData := map[string]interface{}{
		"jobs":   jobResponses,
		"total":  result.Total,
		"limit":  result.Limit,
		"offset": result.Offset,
	}

	return response.Success(c, responseData, "Scraping jobs retrieved successfully")
}

// CancelScrapingJob cancels a running scraping job
// @Summary Cancel scraping job
// @Description Cancel a running or pending scraping job
// @Tags Admin-Scraping
// @Param id path string true "Scraping job ID"
// @Success 200 {object} response.APIResponse
// @Failure 400 {object} response.APIResponse
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /admin/scraping/jobs/{id}/cancel [post]
// @Security BearerAuth
func (h *TenderHandler) CancelScrapingJob(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Scraping job ID is required", "ID parameter cannot be empty")
	}

	err := h.service.CancelScrapingJob(c.Request().Context(), id)
	if err != nil {
		if err.Error() == "scraping job not found" {
			return response.NotFound(c, "Scraping job not found")
		}
		return response.InternalServerError(c, "Failed to cancel scraping job")
	}

	return response.Success(c, map[string]interface{}{"cancelled": true}, "Scraping job cancelled successfully")
}

// GetPublicTenders retrieves public tenders for mobile app
// @Summary Get public tenders
// @Description Retrieve active tenders for mobile application users with automatic company-based matching from customer profile
// @Tags Tenders
// @Produce json
// @Param limit query int false "Number of items per page (default: 20, max: 50)"
// @Param offset query int false "Number of items to skip (default: 0)"
// @Param country_code query string false "Filter by country code"
// @Param min_estimated_value query number false "Minimum estimated value"
// @Param max_estimated_value query number false "Maximum estimated value"
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 400 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/tenders [get]
func (h *TenderHandler) GetPublicTenders(c echo.Context) error {
	// Parse pagination parameters (more restrictive for public API)
	limit := 20
	if l := c.QueryParam("limit"); l != "" {
		if parsed, err := strconv.Atoi(l); err == nil && parsed > 0 && parsed <= 50 {
			limit = parsed
		}
	}

	offset := 0
	if o := c.QueryParam("offset"); o != "" {
		if parsed, err := strconv.Atoi(o); err == nil && parsed >= 0 {
			offset = parsed
		}
	}

	// Build search criteria for public API (only active tenders)
	criteria := TenderSearchCriteria{
		Status: []TenderStatus{TenderStatusActive},
	}

	if countryCode := c.QueryParam("country_code"); countryCode != "" {
		criteria.CountryCodes = []string{countryCode}
	}

	// Parse numeric parameters
	if minValue := c.QueryParam("min_estimated_value"); minValue != "" {
		if parsed, err := strconv.ParseFloat(minValue, 64); err == nil {
			criteria.MinEstimatedValue = &parsed
		}
	}

	if maxValue := c.QueryParam("max_estimated_value"); maxValue != "" {
		if parsed, err := strconv.ParseFloat(maxValue, 64); err == nil {
			criteria.MaxEstimatedValue = &parsed
		}
	}

	// Get company ID from customer context for automatic matching
	var companyID *string
	if customerCompanyID, ok := c.Get("company_id").(string); ok && customerCompanyID != "" {
		companyID = &customerCompanyID
	}

	req := ListTendersRequest{
		Criteria:  criteria,
		Limit:     limit,
		Offset:    offset,
		CompanyID: companyID,
	}

	result, err := h.service.ListTenders(c.Request().Context(), req)
	if err != nil {
		return response.InternalServerError(c, "Failed to retrieve tenders")
	}

	// Convert tenders to public response format (limited fields)
	publicTenders := make([]map[string]interface{}, len(result.Tenders))
	for i, tender := range result.Tenders {
		tenderData := map[string]interface{}{
			"id":                        tender.ID,
			"title":                     tender.Title,
			"description":               tender.Description,
			"procurement_type_code":     tender.ProcurementTypeCode,
			"main_classification":       tender.MainClassification,
			"estimated_value":           tender.EstimatedValue,
			"currency":                  tender.Currency,
			"formatted_estimated_value": tender.FormattedEstimatedValue,
			"tender_deadline":           tender.TenderDeadline,
			"country_code":              tender.CountryCode,
			"city_name":                 tender.CityName,
			"tender_url":                tender.TenderURL,
			"publication_date":          tender.PublicationDate,
			"buyer_organization":        tender.BuyerOrganization,
			"is_expired":                tender.IsExpired,
		}

		// Add match percentage if available
		if tender.MatchPercentage != nil {
			tenderData["match_percentage"] = *tender.MatchPercentage
		}

		publicTenders[i] = tenderData
	}

	responseData := map[string]interface{}{
		"tenders": publicTenders,
		"total":   result.Total,
		"limit":   result.Limit,
		"offset":  result.Offset,
	}

	return response.Success(c, responseData, "Tenders retrieved successfully")
}

// GetPublicTenderDetails retrieves public tender details for mobile app
// @Summary Get public tender details
// @Description Retrieve detailed information about a specific tender for mobile application users
// @Tags Tenders
// @Produce json
// @Param id path string true "Tender ID"
// @Success 200 {object} response.APIResponse{data=map[string]interface{}}
// @Failure 404 {object} response.APIResponse
// @Failure 500 {object} response.APIResponse
// @Router /api/v1/tenders/{id} [get]
func (h *TenderHandler) GetPublicTenderDetails(c echo.Context) error {
	id := c.Param("id")
	if id == "" {
		return response.BadRequest(c, "Tender ID is required", "ID parameter cannot be empty")
	}

	tender, err := h.service.GetTenderByID(c.Request().Context(), id)
	if err != nil {
		return response.NotFound(c, "Tender not found")
	}

	// Return public-safe tender details
	publicTender := map[string]interface{}{
		"id":                         tender.ID,
		"notice_publication_id":      tender.NoticePublicationID,
		"title":                      tender.Title,
		"description":                tender.Description,
		"procurement_type_code":      tender.ProcurementTypeCode,
		"procedure_code":             tender.ProcedureCode,
		"main_classification":        tender.MainClassification,
		"additional_classifications": tender.AdditionalClassifications,
		"estimated_value":            tender.EstimatedValue,
		"currency":                   tender.Currency,
		"formatted_estimated_value":  tender.GetFormattedEstimatedValue(),
		"duration":                   tender.Duration,
		"duration_unit":              tender.DurationUnit,
		"tender_deadline":            tender.TenderDeadline,
		"place_of_performance":       tender.PlaceOfPerformance,
		"country_code":               tender.CountryCode,
		"region_code":                tender.RegionCode,
		"city_name":                  tender.CityName,
		"postal_code":                tender.PostalCode,
		"document_uri":               tender.DocumentURI,
		"tender_url":                 tender.TenderURL,
		"buyer_organization":         tender.BuyerOrganization,
		"organizations":              tender.Organizations,
		"selection_criteria":         tender.SelectionCriteria,
		"official_languages":         tender.OfficialLanguages,
		"publication_date":           tender.PublicationDate,
		"gazette_id":                 tender.GazetteID,
		"is_active":                  tender.IsActive(),
		"is_expired":                 tender.IsExpired(),
	}

	return response.Success(c, publicTender, "Tender details retrieved successfully")
}

// parseStringArray parses a comma-separated string into a string array
func parseStringArray(s string) []string {
	if s == "" {
		return nil
	}

	result := make([]string, 0)
	for _, item := range strings.Split(s, ",") {
		if trimmed := strings.TrimSpace(item); trimmed != "" {
			result = append(result, trimmed)
		}
	}

	return result
}