package handler

import (
	"net/http"
	"strconv"

	"github.com/freefire/jiang13-bbs/middleware"
	"github.com/gin-gonic/gin"
)

// ToggleFavorite 切换当前登录用户对帖子的收藏状态
func (h *Handlers) ToggleFavorite(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的帖子 ID"})
		return
	}
	claims := middleware.CurrentUser(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
		return
	}
	favorited, err := h.Favorite.Toggle(uint(id), claims.ID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"favorited": favorited})
}

// UserFavorites 获取用户收藏的帖子列表（公开可见，仅 published）
func (h *Handlers) UserFavorites(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的用户 ID"})
		return
	}
	if _, err := h.Auth.GetUserByID(uint(id)); err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "用户不存在"})
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))

	posts, total, err := h.Favorite.List(uint(id), page, size)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	// 填充点赞状态（仅登录用户）
	if claims := middleware.CurrentUser(c); claims != nil {
		ids := make([]uint, 0, len(posts))
		for _, p := range posts {
			ids = append(ids, p.ID)
		}
		likedMap := h.Like.BatchHasLiked(ids, claims.ID)
		for i := range posts {
			posts[i].Liked = likedMap[posts[i].ID]
		}
	}

	c.JSON(http.StatusOK, gin.H{
		"posts": nonNilSlice(posts),
		"total": total,
		"page":  page,
		"size":  size,
	})
}