Integrated AI translation

internal/tender/form.go

@@ -35,6 +35,7 @@ type SearchForm struct {
 	BuyerOrganizationID *string  `query:"buyer_organization_id" valid:"optional"`
 	Languages           []string `query:"languages" valid:"optional"`
 	OnlyActiveDeadlines bool     `query:"-" valid:"optional"`
+	Language            *string  `query:"lang" valid:"optional"`
 }
 
 // SearchResponse represents the response for listing tenders
@@ -66,6 +67,7 @@ type TenderResponse struct {
 	TenderID            string                `json:"tender_id"`
 	CreatedAt           int64                 `json:"created_at"`
 	OverallSummary      string                `json:"overall_summary,omitempty"` // AI-generated summary from the pipeline
+	Language            string                `json:"language,omitempty"`
 }
 
 type OrganizationResponse struct {
@@ -74,16 +76,33 @@ type OrganizationResponse struct {
 
 // ToTenderResponse converts a Tender entity to TenderResponse
 func (t *Tender) ToResponse() *TenderResponse {
+	return t.ToResponseWithLanguage("")
+}
+
+// ToResponseWithLanguage converts a Tender entity to TenderResponse using a preferred language.
+// When language is provided and translation exists, translated title/description are returned.
+func (t *Tender) ToResponseWithLanguage(language string) *TenderResponse {
 
 	org := &OrganizationResponse{}
 	if t.BuyerOrganization != nil {
 		org.Name = t.BuyerOrganization.Name
 	}
+	title := t.Title
+	description := t.Description
+	usedLanguage := ""
+	if language != "" {
+		if entry, ok := t.Translations[language]; ok {
+			title = entry.Title
+			description = entry.Description
+			usedLanguage = language
+		}
+	}
+
 	response := &TenderResponse{
 		ID:                  t.ID.Hex(),
 		NoticePublicationID: t.NoticePublicationID,
-		Title:               t.Title,
-		Description:         t.Description,
+		Title:               title,
+		Description:         description,
 		ProcurementTypeCode: t.ProcurementTypeCode,
 		ProcedureCode:       t.ProcedureCode,
 		EstimatedValue:      t.EstimatedValue,
@@ -100,11 +119,25 @@ func (t *Tender) ToResponse() *TenderResponse {
 		Status:              t.Status,
 		TenderID:            t.TenderID,
 		CreatedAt:           t.CreatedAt,
+		Language:            usedLanguage,
 	}
 
 	return response
 }
 
+// AITranslateRequest represents a request for on-demand AI translation.
+type AITranslateRequest struct {
+	Language string `json:"language" valid:"required,stringlength(2|5)~Language must be between 2 and 5 characters"`
+}
+
+// AITranslateResponse represents the response for AI translation trigger.
+type AITranslateResponse struct {
+	NoticeID              string `json:"notice_id"`
+	Language              string `json:"language"`
+	TranslatedTitle       string `json:"translated_title"`
+	TranslatedDescription string `json:"translated_description"`
+}
+
 // AISummaryResponse represents the response for getting an AI-generated summary
 type AISummaryResponse struct {
 	NoticeID       string `json:"notice_id"`