package handler

import (
	"net/http"

	"fashionapi/internal/dto"
	"fashionapi/internal/middleware"
	"fashionapi/internal/pkg/pagination"
	"fashionapi/internal/pkg/response"
	"fashionapi/internal/service"

	"github.com/gin-gonic/gin"
)

// FavoriteHandler 收藏接口（需 Bearer 鉴权，主挂载于 /api/v1/me，legacy /api/v1/auth 仅兼容旧前端）。
type FavoriteHandler struct {
	favs service.FavoriteService
}

// NewFavoriteHandler 创建收藏 handler。
func NewFavoriteHandler(favs service.FavoriteService) *FavoriteHandler {
	return &FavoriteHandler{favs: favs}
}

// List 当前用户收藏（服务端分页）。
//
// GET /api/v1/me/favorites?page=1&per_page=24&kind=（per_page 上限 100）
// kind 留空=不限粒度；gallery=只要图集收藏；image=只要单图收藏。
// 成功：200 { data: { items:[...], total, last_page } }
func (h *FavoriteHandler) List(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	p := pagination.Parse(c, "page", "per_page", 1, 24, 100)
	kind := c.Query("kind")
	if kind != "" && kind != dto.FavoriteKindGallery && kind != dto.FavoriteKindImage {
		response.Error(c, http.StatusBadRequest, "invalid kind")
		return
	}
	items, total, err := h.favs.ListPaged(c.Request.Context(), userID, p.Page, p.PageSize, kind)
	if err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{
		"items":     items,
		"total":     total,
		"last_page": response.LastPage(total, p.PageSize),
	})
}

// Add 新增收藏（幂等：重复添加不报错）。
//
// POST /api/v1/me/favorites
// body: { target_type, target_uid, title?, cover?, brand? }
// 成功：200 { data: <FavoriteItem> }
func (h *FavoriteHandler) Add(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	var req dto.FavoriteAdd
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, http.StatusBadRequest, "invalid request")
		return
	}
	item, err := h.favs.Add(c.Request.Context(), userID, req)
	if err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, item)
}

// Remove 删除收藏。
//
// DELETE /api/v1/me/favorites/:uid
// 成功：200 { data: { ok: true } }
func (h *FavoriteHandler) Remove(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	uid := c.Param("uid")
	if err := h.favs.Remove(c.Request.Context(), userID, uid); err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{"ok": true})
}

// Check 批量查询给定 ids 中哪些已收藏（列表页打勾用，与收藏总量解耦）。
//
// POST /api/v1/me/favorites/checks
// body: { ids: ["r=...","s=..."] }
// 成功：200 { data: ["r=..."] }（仅返回已收藏的 id）
func (h *FavoriteHandler) Check(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	var req dto.FavoriteCheck
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, http.StatusBadRequest, "invalid request")
		return
	}
	ids, err := h.favs.Check(c.Request.Context(), userID, req.IDs)
	if err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, ids)
}