package handler

import (
	"net/http"
	"strconv"

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

// ToggleFollow 切换当前登录用户对目标用户的关注状态
func (h *Handlers) ToggleFollow(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
	}
	claims := middleware.CurrentUser(c)
	if claims == nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "未登录"})
		return
	}
	following, err := h.Follow.Toggle(claims.ID, uint(id))
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"following": following})
}

// UserFollowing 获取用户关注的人列表（公开）
func (h *Handlers) UserFollowing(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"))

	users, total, err := h.Follow.ListFollowing(uint(id), page, size)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

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