package handler

import (
	"strconv"

	"github.com/gin-gonic/gin"

	"with_you/internal/dto"
	"with_you/internal/model"
	"with_you/internal/pkg/response"
	"with_you/internal/service"
)

type TradeHandler struct {
	tradeService service.TradeService
}

func NewTradeHandler(tradeService service.TradeService) *TradeHandler {
	return &TradeHandler{tradeService: tradeService}
}

func (h *TradeHandler) List(c *gin.Context) {
	currentUserID := c.GetString("user_id")
	if currentUserID == "" {
		currentUserID = ""
	}

	var tradeType *model.TradeType
	if v := c.Query("trade_type"); v != "" {
		t := model.TradeType(v)
		tradeType = &t
	}

	var category *model.TradeCategory
	if v := c.Query("category"); v != "" {
		cat := model.TradeCategory(v)
		category = &cat
	}

	cursorStr := c.Query("cursor")
	pageSize := 20
	if v := c.Query("page_size"); v != "" {
		if ps, err := strconv.Atoi(v); err == nil && ps > 0 && ps <= 100 {
			pageSize = ps
		}
	}

	keyword := c.Query("keyword")

	var currentUserIDPtr *string
	if currentUserID != "" {
		currentUserIDPtr = &currentUserID
	}

	var resp *dto.TradeCursorPageResponse
	var err error
	if keyword != "" {
		resp, err = h.tradeService.Search(c.Request.Context(), keyword, tradeType, category, cursorStr, pageSize, currentUserIDPtr)
	} else {
		resp, err = h.tradeService.List(c.Request.Context(), tradeType, category, cursorStr, pageSize, currentUserIDPtr)
	}
	if err != nil {
		response.HandleError(c, err, "获取交易列表失败")
		return
	}
	response.Success(c, resp)
}

func (h *TradeHandler) GetByID(c *gin.Context) {
	id := c.Param("id")
	currentUserID := c.GetString("user_id")

	var currentUserIDPtr *string
	if currentUserID != "" {
		currentUserIDPtr = &currentUserID
	}

	resp, err := h.tradeService.GetByID(c.Request.Context(), id, currentUserIDPtr)
	if err != nil {
		response.HandleError(c, err, "获取交易详情失败")
		return
	}
	response.Success(c, resp)
}

func (h *TradeHandler) Create(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	var req dto.CreateTradeItemRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	item, err := h.tradeService.Create(c.Request.Context(), userID, req)
	if err != nil {
		response.HandleError(c, err, "创建交易失败")
		return
	}

	var currentUserIDPtr *string
	if userID != "" {
		currentUserIDPtr = &userID
	}
	detail, err := h.tradeService.GetByID(c.Request.Context(), item.ID, currentUserIDPtr)
	if err != nil {
		response.Success(c, item)
		return
	}
	response.Success(c, detail)
}

func (h *TradeHandler) Update(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	id := c.Param("id")

	var req dto.UpdateTradeItemRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	if err := h.tradeService.Update(c.Request.Context(), userID, id, req); err != nil {
		response.HandleError(c, err, "更新交易失败")
		return
	}

	var currentUserIDPtr *string
	if userID != "" {
		currentUserIDPtr = &userID
	}
	detail, err := h.tradeService.GetByID(c.Request.Context(), id, currentUserIDPtr)
	if err != nil {
		response.Success(c, nil)
		return
	}
	response.Success(c, detail)
}

func (h *TradeHandler) Delete(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	id := c.Param("id")
	if err := h.tradeService.Delete(c.Request.Context(), userID, id); err != nil {
		response.HandleError(c, err, "删除交易失败")
		return
	}
	response.Success(c, nil)
}

func (h *TradeHandler) UpdateStatus(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	id := c.Param("id")

	var req dto.UpdateTradeItemStatusRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, err.Error())
		return
	}

	if err := h.tradeService.UpdateStatus(c.Request.Context(), userID, id, model.TradeItemStatus(req.Status)); err != nil {
		response.HandleError(c, err, "更新交易状态失败")
		return
	}
	response.Success(c, nil)
}

func (h *TradeHandler) RecordView(c *gin.Context) {
	id := c.Param("id")
	_ = h.tradeService.RecordView(c.Request.Context(), id)
	response.Success(c, nil)
}

func (h *TradeHandler) Favorite(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	id := c.Param("id")
	if err := h.tradeService.Favorite(c.Request.Context(), userID, id); err != nil {
		response.HandleError(c, err, "收藏失败")
		return
	}
	response.Success(c, dto.TradeFavoriteResponse{Favorited: true})
}

func (h *TradeHandler) Unfavorite(c *gin.Context) {
	userID := c.GetString("user_id")
	if userID == "" {
		response.Unauthorized(c, "请先登录")
		return
	}

	id := c.Param("id")
	if err := h.tradeService.Unfavorite(c.Request.Context(), userID, id); err != nil {
		response.HandleError(c, err, "取消收藏失败")
		return
	}
	response.Success(c, dto.TradeFavoriteResponse{Favorited: false})
}