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)
	}
}