package web

import (
	"fmt"
	"html"
	"net/http"
	"net/url"
	"strconv"
	"strings"

	"git.iioio.com/freefire/jiang13-forum/models"
	"git.iioio.com/freefire/jiang13-forum/services"
	"github.com/gin-gonic/gin"
)

// PostPageData 帖详情
type PostPageData struct {
	PageChrome
	PostID         uint
	PostPath       string
	PostTitle      string
	AuthorName     string
	AuthorID       uint
	BoardID        uint
	BoardName      string
	Pinned         bool // 展示用：全局或版内置顶
	GlobalPinned   bool
	BoardPinned    bool
	Featured       bool
	EditLocked     bool
	PostTypeLabel  string
	CreatedLabel   string
	ViewCount      int
	LikeCount      int
	Liked          bool
	Favorited      bool
	BodyHTML       string
	CommentCount   int
	Comments       []CommentView
	CommentsLocked bool
	CanEdit        bool
	CanReportPost  bool
	IsAdmin        bool
}

// CommentView 评论
type CommentView struct {
	ID             uint
	Floor          int
	AuthorName     string
	AuthorID       uint
	CreatedLabel   string
	Content        string
	ContentHidden  bool
	ReplyToID      uint
	ReplyToFloor   int
	ReplyToAuthor  string
	LikeCount      int
	Liked          bool
	IsPrivate      bool
	CanReport      bool
}

// PostView GET /post/:id
func (d Deps) PostView(c *gin.Context) {
	ctx := d.ctx(c)
	idStr := stripIDParam(c.Param("id"), d.Settings.Permalink().Ext)
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil || id == 0 {
		d.render404(ctx)
		return
	}
	post, err := d.Post.FindByID(uint(id))
	if err != nil || !services.CanViewPost(post, ctx.UserID(), ctx.IsAdmin()) {
		d.render404(ctx)
		return
	}
	if post.Status == models.ContentStatusPublished {
		d.Post.RecordView(uint(id))
	}

	hasReplied := ctx.UserID() > 0 && d.Comment.HasUserReplied(uint(id), ctx.UserID())
	body := services.ApplyPostContentGates(post.Content, post, ctx.UserID(), ctx.IsAdmin(), hasReplied)

	comments, _ := d.Comment.ListByPost(uint(id), ctx.UserID(), ctx.IsAdmin(), post.UserID, nil)
	cv := make([]CommentView, 0, len(comments))
	for _, cm := range comments {
		an := strings.TrimSpace(cm.User.Nickname)
		if an == "" {
			an = cm.User.Username
		}
		view := CommentView{
			ID: cm.ID, Floor: cm.Floor, AuthorName: an, AuthorID: cm.UserID,
			CreatedLabel: formatTime(cm.CreatedAt),
			Content: cm.Content, ContentHidden: cm.ContentHidden,
			LikeCount: cm.LikeCount, Liked: cm.Liked, IsPrivate: cm.IsPrivate,
			CanReport: ctx.IsSigned() && (cm.UserID == 0 || cm.UserID != ctx.UserID()),
		}
		if cm.ReplyTarget != nil {
			view.ReplyToID = cm.ReplyTarget.ID
			view.ReplyToFloor = cm.ReplyTarget.Floor
			rn := strings.TrimSpace(cm.ReplyTarget.User.Nickname)
			if rn == "" {
				rn = cm.ReplyTarget.User.Username
			}
			if rn == "" {
				rn = cm.ReplyTarget.GuestNick
			}
			view.ReplyToAuthor = rn
		} else if cm.ReplyTo != nil {
			view.ReplyToID = *cm.ReplyTo
		}
		cv = append(cv, view)
	}

	author := strings.TrimSpace(post.User.Nickname)
	if author == "" {
		author = post.User.Username
	}
	boardName := ""
	if post.Board.ID > 0 {
		boardName = post.Board.Name
	}

	chrome := d.chrome(ctx, post.Title+" · "+d.Settings.SiteBranding().Name, "", "post/body")
	chrome.ActiveBoard = post.BoardID

	ctx.HTML(http.StatusOK, "post", PostPageData{
		PageChrome: chrome, PostID: post.ID,
		PostPath: url.QueryEscape(fmt.Sprintf("/post/%d", post.ID)),
		PostTitle: post.Title, AuthorName: author, AuthorID: post.UserID,
		BoardID: post.BoardID, BoardName: boardName,
		Pinned: post.Pinned || post.BoardPinned, GlobalPinned: post.Pinned, BoardPinned: post.BoardPinned,
		Featured: post.Featured, EditLocked: post.EditLocked,
		PostTypeLabel: postTypeLabel(post.PostType), CreatedLabel: formatTime(post.CreatedAt),
		ViewCount: post.ViewCount, LikeCount: post.LikeCount,
		Liked: d.Post.IsLiked(ctx.UserID(), post.ID), Favorited: d.Post.IsFavorited(ctx.UserID(), post.ID),
		BodyHTML: body, CommentCount: len(cv), Comments: cv,
		CommentsLocked: post.CommentsLocked,
		CanEdit:        d.Post.CanUserEdit(post, ctx.UserID(), ctx.IsAdmin()),
		CanReportPost:  ctx.IsSigned() && post.UserID != ctx.UserID(),
		IsAdmin:        ctx.IsAdmin(),
	})
}

func postTypeLabel(t string) string {
	switch t {
	case models.PostTypeQuestion:
		return "问答"
	case models.PostTypePoll:
		return "投票"
	case models.PostTypeBounty:
		return "悬赏"
	case models.PostTypeLottery:
		return "抽奖"
	default:
		return ""
	}
}

// PostComment POST 评论
func (d Deps) PostComment(c *gin.Context) {
	ctx := d.ctx(c)
	if !ctx.CheckCSRF() {
		ctx.SetFlash("无效请求，请重试")
		ctx.Redirect("/")
		return
	}
	id, err := parsePostID(c, d)
	if err != nil {
		d.render404(ctx)
		return
	}
	content := strings.TrimSpace(c.PostForm("content"))
	if content == "" {
		ctx.SetFlash("评论不能为空")
		ctx.Redirect(fmt.Sprintf("/post/%d#comments", id))
		return
	}
	var replyTo *uint
	if raw := strings.TrimSpace(c.PostForm("reply_to")); raw != "" {
		rid, err := strconv.ParseUint(raw, 10, 64)
		if err == nil && rid > 0 {
			v := uint(rid)
			replyTo = &v
		}
	}
	isPrivate := c.PostForm("is_private") == "1" || c.PostForm("is_private") == "on"
	safe := "<p>" + html.EscapeString(content) + "</p>"
	cm, err := d.Comment.Create(services.CommentCreateInput{
		PostID: id, UserID: ctx.UserID(), Content: safe,
		ReplyTo: replyTo, IsPrivate: isPrivate,
	})
	if err != nil {
		ctx.SetFlash(err.Error())
		ctx.Redirect(fmt.Sprintf("/post/%d#comments", id))
		return
	}
	anchor := "#comments"
	if cm != nil && cm.Floor > 0 {
		anchor = fmt.Sprintf("#floor-%d", cm.Floor)
	}
	ctx.Redirect(fmt.Sprintf("/post/%d%s", id, anchor))
}

// PostCommentLike 评论点赞切换（PRG）
func (d Deps) PostCommentLike(c *gin.Context) {
	ctx := d.ctx(c)
	if !ctx.CheckCSRF() {
		ctx.SetFlash("无效请求")
		ctx.Redirect("/")
		return
	}
	postID, err := parsePostID(c, d)
	if err != nil {
		d.render404(ctx)
		return
	}
	cid, err := strconv.ParseUint(c.Param("cid"), 10, 64)
	if err != nil || cid == 0 {
		d.render404(ctx)
		return
	}
	cm, err := d.Comment.GetByID(uint(cid))
	if err != nil || cm.PostID != postID {
		d.render404(ctx)
		return
	}
	_, _, _ = d.Comment.ToggleLike(ctx.UserID(), uint(cid))
	ctx.Redirect(fmt.Sprintf("/post/%d#floor-%d", postID, cm.Floor))
}

// PostUnlock POST /post/:id/unlock — 积分解锁（JSON，供详情页渐进增强）
func (d Deps) PostUnlock(c *gin.Context) {
	ctx := d.ctx(c)
	if !ctx.CheckCSRF() {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效请求，请重试"})
		return
	}
	id, err := parsePostID(c, d)
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "帖子不存在"})
		return
	}
	var req struct {
		BlockKey string `json:"block_key" form:"block_key"`
	}
	_ = c.ShouldBindJSON(&req)
	if req.BlockKey == "" {
		req.BlockKey = strings.TrimSpace(c.PostForm("block_key"))
	}
	if req.BlockKey == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "缺少 block_key"})
		return
	}
	res, err := services.UnlockPointsBlock(ctx.UserID(), id, req.BlockKey)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"message": "解锁成功",
		"unlock":  res,
	})
}

// PostLike 赞
func (d Deps) PostLike(c *gin.Context) {
	ctx := d.ctx(c)
	if !ctx.CheckCSRF() {
		ctx.SetFlash("无效请求")
		ctx.Redirect("/")
		return
	}
	id, err := parsePostID(c, d)
	if err != nil {
		d.render404(ctx)
		return
	}
	_, _ = d.Post.ToggleLike(ctx.UserID(), id)
	ctx.Redirect(fmt.Sprintf("/post/%d", id))
}

// PostFavorite 收藏
func (d Deps) PostFavorite(c *gin.Context) {
	ctx := d.ctx(c)
	if !ctx.CheckCSRF() {
		ctx.SetFlash("无效请求")
		ctx.Redirect("/")
		return
	}
	id, err := parsePostID(c, d)
	if err != nil {
		d.render404(ctx)
		return
	}
	_, _ = d.Post.ToggleFavorite(ctx.UserID(), id)
	ctx.Redirect(fmt.Sprintf("/post/%d", id))
}

func parsePostID(c *gin.Context, d Deps) (uint, error) {
	idStr := stripIDParam(c.Param("id"), d.Settings.Permalink().Ext)
	id, err := strconv.ParseUint(idStr, 10, 64)
	return uint(id), err
}