package handler

import (
	"net/http"
	"strconv"

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

// PostComments 获取帖子评论树（楼层分页：主评论算楼层，每楼附带全部子回复，时间正序）
func (h *Handlers) PostComments(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
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	size, _ := strconv.Atoi(c.DefaultQuery("size", "20"))

	comments, floors, totalComments, err := h.Comment.ListFloorPaged(uint(id), page, size)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"comments":       comments,
		"total":          floors,       // 楼层数（主评论数）→ 前端分页与楼层号计算
		"total_comments": totalComments, // 全部评论数（含回复）→ 展示徽标
		"page":           page,
		"size":           size,
	})
}

// CreateCommentRequest 评论请求
type CreateCommentRequest struct {
	Content  string `json:"content" binding:"required,min=1"`
	ParentID *uint  `json:"parent_id"` // 非空 = 回复该评论（发为其子评论）
}

// CreateComment 创建评论（主评论或子回复）
func (h *Handlers) CreateComment(c *gin.Context) {
	claims := middleware.CurrentUser(c)
	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
	}
	var req CreateCommentRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	comment, parent, err := h.Comment.Create(claims.ID, uint(id), req.Content, req.ParentID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if parent == nil {
		// 主评论：通知帖子作者（排除自己评论自己的帖子）
		if authorID, e := h.Post.GetAuthorID(uint(id)); e == nil {
			h.Notification.Create(authorID, claims.ID, model.NotificationTypeComment, uint(id), comment.ID, req.Content)
		}
	} else {
		// 子回复：通知父评论作者（Notification.Create 内部排除自我通知）
		h.Notification.Create(parent.UserID, claims.ID, model.NotificationTypeReply, uint(id), comment.ID, req.Content)
	}
	c.JSON(http.StatusOK, gin.H{"comment": comment})
}

// DeleteComment 删除评论
func (h *Handlers) DeleteComment(c *gin.Context) {
	claims := middleware.CurrentUser(c)
	cid, err := strconv.ParseUint(c.Param("cid"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的评论 ID"})
		return
	}
	if err := h.Comment.Delete(uint(cid), claims.ID, claims.Role); err != nil {
		c.JSON(http.StatusForbidden, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "已删除"})
}