Initial commit: dating app backend (Go/Gin/GORM/Postgres)

Phone+OTP auth, staged onboarding, admin approval workflow, and a
full discovery/swipe/match/chat system with photo upload and
approximate distance (haversine) based on user location.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/handler/chat_handler.go

@@ -0,0 +1,87 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"dating-app/internal/dto"
+	"dating-app/internal/service"
+	"dating-app/internal/utils"
+)
+
+type ChatHandler struct {
+	chatService *service.ChatService
+}
+
+func NewChatHandler(chatService *service.ChatService) *ChatHandler {
+	return &ChatHandler{chatService: chatService}
+}
+
+// ListMatches GET /matches
+func (h *ChatHandler) ListMatches(c *gin.Context) {
+	user, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	matches, err := h.chatService.ListMatches(user.ID)
+	if err != nil {
+		utils.Fail(c, http.StatusInternalServerError, "خطا در دریافت مچ‌ها", nil)
+		return
+	}
+	utils.Success(c, http.StatusOK, "", matches)
+}
+
+// ListMessages GET /matches/:id/messages
+func (h *ChatHandler) ListMessages(c *gin.Context) {
+	user, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	matchID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.Fail(c, http.StatusBadRequest, "شناسه نامعتبر است", nil)
+		return
+	}
+	messages, err := h.chatService.ListMessages(user.ID, uint(matchID))
+	if err != nil {
+		h.handleError(c, err)
+		return
+	}
+	utils.Success(c, http.StatusOK, "", messages)
+}
+
+// SendMessage POST /matches/:id/messages   body: {text}
+func (h *ChatHandler) SendMessage(c *gin.Context) {
+	user, ok := currentUser(c)
+	if !ok {
+		return
+	}
+	matchID, err := strconv.ParseUint(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.Fail(c, http.StatusBadRequest, "شناسه نامعتبر است", nil)
+		return
+	}
+	var req dto.SendMessageRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.Fail(c, http.StatusBadRequest, "متن پیام نمی‌تونه خالی باشه", err.Error())
+		return
+	}
+	msg, err := h.chatService.SendMessage(user.ID, uint(matchID), req.Text)
+	if err != nil {
+		h.handleError(c, err)
+		return
+	}
+	utils.Success(c, http.StatusCreated, "", msg)
+}
+
+func (h *ChatHandler) handleError(c *gin.Context, err error) {
+	switch {
+	case errors.Is(err, service.ErrNotMatchMember):
+		utils.Fail(c, http.StatusForbidden, err.Error(), nil)
+	default:
+		utils.Fail(c, http.StatusNotFound, "گفتگو یافت نشد", nil)
+	}
+}