package telegram

import (
	"fmt"
	"html"
	"strconv"
	"strings"

	tele "gopkg.in/telebot.v3"
)

const (
	cbPrefixDelEntry    = "del:"
	cbPrefixDelWithMsg  = "delwithmsg:"
	cbPrefixDelOnlyToc  = "delonlytoc:"
)

func (b *Bot) handleEntryDel(c tele.Context) error {
	id := strings.TrimSpace(c.Message().Payload)
	if id == "" {
		return c.Reply("用法: /del <ID>")
	}

	entry, err := b.storage.GetEntry(id)
	if err != nil {
		return c.Reply(fmt.Sprintf("❌ %v", err))
	}

	menu := &tele.ReplyMarkup{}
	delWithMsgBtn := menu.Data("🗑 删除条目+频道消息", cbPrefixDelWithMsg+id)
	delOnlyTocBtn := menu.Data("📝 仅删除目录条目", cbPrefixDelOnlyToc+id)
	cancelBtn := menu.Data("❌ 取消", cbCancel)
	menu.Inline(
		menu.Row(delWithMsgBtn),
		menu.Row(delOnlyTocBtn),
		menu.Row(cancelBtn),
	)

	text := fmt.Sprintf("🗑 确认删除?\n\n分类: %s\n标题: %s\n\n请选择删除方式:", entry.Category, entry.Title)
	return c.Reply(text, menu)
}

func (b *Bot) handleEntryEdit(c tele.Context) error {
	args := strings.SplitN(c.Message().Payload, " ", 2)
	if len(args) < 2 {
		return c.Reply("用法: /edit <ID> <新标题>")
	}

	id := args[0]
	newTitle := strings.TrimSpace(args[1])

	if err := b.storage.UpdateEntryTitle(id, newTitle); err != nil {
		return c.Reply(fmt.Sprintf("❌ %v", err))
	}

	b.toc.TriggerUpdate()
	return c.Reply(fmt.Sprintf("✅ 标题已更新为: %s", newTitle))
}

func (b *Bot) handleEntryMove(c tele.Context) error {
	args := strings.Fields(c.Message().Payload)
	if len(args) < 2 {
		return c.Reply("用法: /move <ID> <新分类>")
	}

	id := args[0]
	newCategory := args[1]

	if !b.storage.CategoryExists(newCategory) {
		return c.Reply(fmt.Sprintf("❌ 分类 [%s] 不存在", newCategory))
	}

	if err := b.storage.UpdateEntryCategory(id, newCategory); err != nil {
		return c.Reply(fmt.Sprintf("❌ %v", err))
	}

	b.toc.TriggerUpdate()
	return c.Reply(fmt.Sprintf("✅ 已移动到分类: %s", newCategory))
}

func (b *Bot) handleEntryList(c tele.Context) error {
	category := strings.TrimSpace(c.Message().Payload)

	entries, err := b.storage.ListEntries(category)
	if err != nil {
		return c.Reply(fmt.Sprintf("❌ %v", err))
	}

	if len(entries) == 0 {
		if category != "" {
			return c.Reply(fmt.Sprintf("📭 分类 [%s] 暂无条目", category))
		}
		return c.Reply("📭 暂无条目")
	}

	var sb strings.Builder
	if category != "" {
		sb.WriteString(fmt.Sprintf("📋 分类 [%s] 的条目:\n\n", html.EscapeString(category)))
	} else {
		sb.WriteString("📋 所有条目:\n\n")
	}

	currentCat := ""
	for _, e := range entries {
		if category == "" && e.Category != currentCat {
			currentCat = e.Category
			sb.WriteString(fmt.Sprintf("\n【%s】\n", html.EscapeString(currentCat)))
		}
		sb.WriteString(fmt.Sprintf("• <code>%s</code> %s\n", e.ID, html.EscapeString(e.Title)))
	}

	return c.Reply(sb.String(), tele.ModeHTML)
}

func (b *Bot) handleRefresh(c tele.Context) error {
	b.toc.TriggerUpdate()
	return c.Reply("🔄 目录刷新已触发")
}

// handleDeleteEntryCallback 处理删除条目的回调
func (b *Bot) handleDeleteEntryCallback(c tele.Context, entryID string, deleteChannelMsg bool) error {
	entry, err := b.storage.GetEntry(entryID)
	if err != nil {
		c.Edit(fmt.Sprintf("❌ %v", err))
		return c.Respond(&tele.CallbackResponse{Text: "条目不存在"})
	}

	// 根据用户选择决定是否删除频道消息
	msgDeleted := false
	if deleteChannelMsg {
		if msgID := parseMessageIDFromLink(entry.Link); msgID != 0 {
			channel := &tele.Chat{ID: b.cfg.Channel.ID}
			msg := &tele.Message{ID: msgID, Chat: channel}
			if err := b.bot.Delete(msg); err == nil {
				msgDeleted = true
			}
		}
	}

	if err := b.storage.DeleteEntry(entryID); err != nil {
		c.Edit(fmt.Sprintf("❌ 删除失败: %v", err))
		return c.Respond(&tele.CallbackResponse{Text: "删除失败"})
	}

	b.toc.TriggerUpdate()

	var text string
	if deleteChannelMsg && msgDeleted {
		text = fmt.Sprintf("✅ 已删除: [%s] %s\n📨 频道消息已同步删除", entry.Category, entry.Title)
	} else if deleteChannelMsg && !msgDeleted {
		text = fmt.Sprintf("✅ 已删除: [%s] %s\n⚠️ 频道消息删除失败（可能已被删除）", entry.Category, entry.Title)
	} else {
		text = fmt.Sprintf("✅ 已删除: [%s] %s\n📝 频道消息已保留", entry.Category, entry.Title)
	}

	c.Edit(text)
	return c.Respond(&tele.CallbackResponse{Text: "删除成功"})
}

// parseMessageIDFromLink 从链接中解析消息ID
// 支持格式: https://t.me/c/123456/789 或 https://t.me/username/789
func parseMessageIDFromLink(link string) int {
	parts := strings.Split(link, "/")
	if len(parts) < 1 {
		return 0
	}
	msgID, err := strconv.Atoi(parts[len(parts)-1])
	if err != nil {
		return 0
	}
	return msgID
}