package handler

import (
	"net/http"

	"github.com/gin-gonic/gin"

	"wx_service/internal/marketing/service"
	"wx_service/internal/middleware"
	"wx_service/internal/model"
)

type DownloadHandler struct {
	svc *service.DownloadService
}

func NewDownloadHandler(svc *service.DownloadService) *DownloadHandler {
	return &DownloadHandler{svc: svc}
}

func (h *DownloadHandler) Create(c *gin.Context) {
	user := middleware.MustCurrentUser(c)

	var req service.CreateDownloadRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Error(http.StatusBadRequest, "请求参数错误"))
		return
	}

	dl, err := h.svc.Create(user.ID, req)
	if err != nil {
		if service.IsBadRequestError(err) {
			c.JSON(http.StatusBadRequest, model.Error(http.StatusBadRequest, err.Error()))
			return
		}
		c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "服务器错误"))
		return
	}

	c.JSON(http.StatusOK, model.Success(dl))
}

type adCallbackRequest struct {
	DownloadID uint `json:"download_id" binding:"required"`
}

func (h *DownloadHandler) AdCallback(c *gin.Context) {
	var req adCallbackRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.Error(http.StatusBadRequest, "请求参数错误"))
		return
	}

	if err := h.svc.MarkAdCompleted(req.DownloadID); err != nil {
		if service.IsNotFoundError(err) {
			c.JSON(http.StatusNotFound, model.Error(http.StatusNotFound, "记录不存在"))
			return
		}
		c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "服务器错误"))
		return
	}

	c.JSON(http.StatusOK, model.Success(nil))
}

func (h *DownloadHandler) ListByUser(c *gin.Context) {
	user := middleware.MustCurrentUser(c)
	page := parseIntQuery(c, "page", 1)
	pageSize := parseIntQuery(c, "page_size", 20)

	resp, err := h.svc.ListByUser(user.ID, page, pageSize)
	if err != nil {
		c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "服务器错误"))
		return
	}

	c.JSON(http.StatusOK, model.Success(resp))
}

func (h *DownloadHandler) AdminStats(c *gin.Context) {
	stats, err := h.svc.GetStats()
	if err != nil {
		c.JSON(http.StatusInternalServerError, model.Error(http.StatusInternalServerError, "服务器错误"))
		return
	}
	c.JSON(http.StatusOK, model.Success(stats))
}