add sender and receiver

internal/handler/letter_handler.go

@@ -17,6 +17,7 @@ type LetterService interface {
 	CreateIncomingLetter(ctx context.Context, req *contract.CreateIncomingLetterRequest) (*contract.IncomingLetterResponse, error)
 	GetIncomingLetterByID(ctx context.Context, id uuid.UUID) (*contract.IncomingLetterResponse, error)
 	ListIncomingLetters(ctx context.Context, req *contract.ListIncomingLettersRequest) (*contract.ListIncomingLettersResponse, error)
+	SearchIncomingLetters(ctx context.Context, req *contract.SearchIncomingLettersRequest) (*contract.SearchIncomingLettersResponse, error)
 	GetLetterUnreadCounts(ctx context.Context) (*contract.LetterUnreadCountResponse, error)
 	MarkIncomingLetterAsRead(ctx context.Context, letterID uuid.UUID) (*contract.MarkLetterReadResponse, error)
 	MarkOutgoingLetterAsRead(ctx context.Context, letterID uuid.UUID) (*contract.MarkLetterReadResponse, error)
@@ -358,6 +359,34 @@ func (h *LetterHandler) UpdateDiscussion(c *gin.Context) {
 	h.respondSuccess(c, http.StatusOK, resp)
 }
 
+func (h *LetterHandler) SearchIncomingLetters(c *gin.Context) {
+	var req contract.SearchIncomingLettersRequest
+	if !h.bindQuery(c, &req) {
+		return
+	}
+
+	if req.Page <= 0 {
+		req.Page = 1
+	}
+	if req.Limit <= 0 {
+		req.Limit = 10
+	}
+	if req.SortOrder == "" {
+		req.SortOrder = "desc"
+	}
+	if req.SortBy == "" {
+		req.SortBy = "created_at"
+	}
+
+	resp, err := h.svc.SearchIncomingLetters(c.Request.Context(), &req)
+	if err != nil {
+		h.handleServiceError(c, err)
+		return
+	}
+
+	h.respondSuccess(c, http.StatusOK, resp)
+}
+
 func (h *LetterHandler) GetDepartmentDispositionStatus(c *gin.Context) {
 	letterID, ok := h.parseUUID(c, "letter_id")
 	if !ok {

internal/handler/letter_outgoing_handler.go

@@ -15,6 +15,7 @@ type LetterOutgoingService interface {
 	CreateOutgoingLetter(ctx context.Context, req *contract.CreateOutgoingLetterRequest) (*contract.OutgoingLetterResponse, error)
 	GetOutgoingLetterByID(ctx context.Context, id uuid.UUID) (*contract.OutgoingLetterResponse, error)
 	ListOutgoingLetters(ctx context.Context, req *contract.ListOutgoingLettersRequest) (*contract.ListOutgoingLettersResponse, error)
+	SearchOutgoingLetters(ctx context.Context, req *contract.SearchOutgoingLettersRequest) (*contract.SearchOutgoingLettersResponse, error)
 	UpdateOutgoingLetter(ctx context.Context, id uuid.UUID, req *contract.UpdateOutgoingLetterRequest) (*contract.OutgoingLetterResponse, error)
 	DeleteOutgoingLetter(ctx context.Context, id uuid.UUID) error
 
@@ -402,6 +403,35 @@ func (h *LetterOutgoingHandler) DeleteDiscussion(c *gin.Context) {
 	c.JSON(http.StatusOK, &contract.SuccessResponse{Message: "discussion deleted"})
 }
 
+func (h *LetterOutgoingHandler) SearchOutgoingLetters(c *gin.Context) {
+	var req contract.SearchOutgoingLettersRequest
+	if err := c.ShouldBindQuery(&req); err != nil {
+		c.JSON(http.StatusBadRequest, &contract.ErrorResponse{Error: "invalid query parameters", Code: http.StatusBadRequest})
+		return
+	}
+
+	if req.Page <= 0 {
+		req.Page = 1
+	}
+	if req.Limit <= 0 {
+		req.Limit = 10
+	}
+	if req.SortOrder == "" {
+		req.SortOrder = "desc"
+	}
+	if req.SortBy == "" {
+		req.SortBy = "created_at"
+	}
+
+	resp, err := h.svc.SearchOutgoingLetters(c.Request.Context(), &req)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, &contract.ErrorResponse{Error: err.Error(), Code: http.StatusInternalServerError})
+		return
+	}
+
+	c.JSON(http.StatusOK, contract.BuildSuccessResponse(resp))
+}
+
 func (h *LetterOutgoingHandler) GetLetterApprovalInfo(c *gin.Context) {
 	id, err := uuid.Parse(c.Param("id"))
 	if err != nil {