package handler

import (
	"errors"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	"wx_service/internal/marketing/model"
	"wx_service/internal/marketing/repository"
	commonmodel "wx_service/internal/model"
)

type AdPlacementHandler struct {
	repo *repository.AdPlacementRepository
}

func NewAdPlacementHandler(repo *repository.AdPlacementRepository) *AdPlacementHandler {
	return &AdPlacementHandler{repo: repo}
}

func (h *AdPlacementHandler) AdminList(c *gin.Context) {
	list, err := h.repo.ListAll()
	if err != nil {
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "获取广告位列表失败"))
		return
	}
	c.JSON(http.StatusOK, commonmodel.Success(list))
}

type adPlacementCreateReq struct {
	MiniProgramID uint   `json:"mini_program_id" binding:"required"`
	Name          string `json:"name" binding:"required"`
	AdType        string `json:"ad_type" binding:"required"`
	AdUnitID      string `json:"ad_unit_id"`
	Status        *int   `json:"status"`
	Description   string `json:"description"`
}

func (h *AdPlacementHandler) AdminCreate(c *gin.Context) {
	var req adPlacementCreateReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, commonmodel.Error(http.StatusBadRequest, "参数错误"))
		return
	}

	p := &model.AdPlacement{
		MiniProgramID: req.MiniProgramID,
		Name:          req.Name,
		AdType:        req.AdType,
		AdUnitID:      req.AdUnitID,
		Description:   req.Description,
		Status:        1,
	}
	if req.Status != nil {
		p.Status = *req.Status
	}

	if err := h.repo.Create(p); err != nil {
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "创建失败"))
		return
	}
	c.JSON(http.StatusOK, commonmodel.Success(p))
}

type adPlacementUpdateReq struct {
	Name        *string `json:"name"`
	AdUnitID    *string `json:"ad_unit_id"`
	Status      *int    `json:"status"`
	Description *string `json:"description"`
}

func (h *AdPlacementHandler) AdminUpdate(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		c.JSON(http.StatusBadRequest, commonmodel.Error(http.StatusBadRequest, "无效 ID"))
		return
	}

	p, err := h.repo.FindByID(uint(id))
	if err != nil {
		if errors.Is(err, repository.ErrAdPlacementNotFound) {
			c.JSON(http.StatusNotFound, commonmodel.Error(http.StatusNotFound, "广告位不存在"))
			return
		}
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "查询失败"))
		return
	}

	var req adPlacementUpdateReq
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, commonmodel.Error(http.StatusBadRequest, "参数错误"))
		return
	}

	if req.Name != nil {
		p.Name = *req.Name
	}
	if req.AdUnitID != nil {
		p.AdUnitID = *req.AdUnitID
	}
	if req.Status != nil {
		p.Status = *req.Status
	}
	if req.Description != nil {
		p.Description = *req.Description
	}

	if err := h.repo.Update(p); err != nil {
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "更新失败"))
		return
	}
	c.JSON(http.StatusOK, commonmodel.Success(p))
}

func (h *AdPlacementHandler) AdminDelete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		c.JSON(http.StatusBadRequest, commonmodel.Error(http.StatusBadRequest, "无效 ID"))
		return
	}

	if err := h.repo.Delete(uint(id)); err != nil {
		if errors.Is(err, repository.ErrAdPlacementNotFound) {
			c.JSON(http.StatusNotFound, commonmodel.Error(http.StatusNotFound, "广告位不存在"))
			return
		}
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "删除失败"))
		return
	}
	c.JSON(http.StatusOK, commonmodel.Success(nil))
}

func (h *AdPlacementHandler) GetAdConfig(c *gin.Context) {
	miniProgramIDStr := c.Query("mini_program_id")
	miniProgramID, _ := strconv.ParseUint(miniProgramIDStr, 10, 64)
	if miniProgramID == 0 {
		c.JSON(http.StatusBadRequest, commonmodel.Error(http.StatusBadRequest, "缺少 mini_program_id"))
		return
	}

	p, err := h.repo.FindByMiniProgramAndType(uint(miniProgramID), "rewarded_video")
	if err != nil {
		if errors.Is(err, repository.ErrAdPlacementNotFound) {
			c.JSON(http.StatusOK, commonmodel.Success(gin.H{"ad_unit_id": "", "enabled": false}))
			return
		}
		c.JSON(http.StatusInternalServerError, commonmodel.Error(http.StatusInternalServerError, "查询失败"))
		return
	}

	c.JSON(http.StatusOK, commonmodel.Success(gin.H{
		"ad_unit_id": p.AdUnitID,
		"enabled":    p.Status == 1 && p.AdUnitID != "",
	}))
}