package handlers

import (
	"regexp"
	"strings"

	"github.com/celestix/gotgproto/dispatcher"
	"github.com/celestix/gotgproto/ext"
	"github.com/charmbracelet/log"
	"github.com/krau/SaveAny-Bot/client/bot/handlers/utils/msgelem"
	"github.com/krau/SaveAny-Bot/common/utils/tgutil"
	"github.com/krau/SaveAny-Bot/database"
)

func handleWatchCmd(ctx *ext.Context, update *ext.Update) error {
	logger := log.FromContext(ctx)
	args := strings.Split(string(update.EffectiveMessage.Text), " ")
	if len(args) < 2 {
		ctx.Reply(update, ext.ReplyTextString(msgelem.WatchHelpText), nil)
		return dispatcher.EndGroups
	}
	userChatID := update.GetUserChat().GetID()
	user, err := database.GetUserByChatID(ctx, userChatID)
	if err != nil {
		logger.Errorf("获取用户失败: %s", err)
		ctx.Reply(update, ext.ReplyTextString("获取用户失败"), nil)
		return dispatcher.EndGroups
	}
	if user.DefaultStorage == "" {
		ctx.Reply(update, ext.ReplyTextString("请先设置默认存储, 使用 /storage 命令"), nil)
		return dispatcher.EndGroups
	}
	chatArg := args[1]
	chatID, err := tgutil.ParseChatID(ctx, chatArg)
	if err != nil {
		ctx.Reply(update, ext.ReplyTextString("无效的ID或用户名: "+err.Error()), nil)
		return dispatcher.EndGroups
	}
	watching, err := user.WatchingChat(ctx, chatID)
	if err != nil {
		logger.Errorf("Failed to check if user is watching chat %d: %s", chatID, err)
		return dispatcher.EndGroups
	}
	if watching {
		ctx.Reply(update, ext.ReplyTextString("已经在监听此聊天"), nil)
		return dispatcher.EndGroups
	}
	filter := ""
	if len(args) > 2 {
		filterArg := strings.Join(args[2:], " ")
		filterType := strings.Split(filterArg, ":")[0]
		filterData := strings.Split(filterArg, ":")[1]
		if filterType == "" || filterData == "" {
			ctx.Reply(update, ext.ReplyTextString("过滤器格式错误, 请使用 <过滤器类型>:<表达式>"), nil)
			return dispatcher.EndGroups
		}
		switch filterType {
		case "msgre":
			_, err := regexp.Compile(filterData)
			if err != nil {
				ctx.Reply(update, ext.ReplyTextString("正则表达式格式错误: "+err.Error()), nil)
				return dispatcher.EndGroups
			}
			filter = filterType + ":" + filterData
		default:
			ctx.Reply(update, ext.ReplyTextString("不支持的过滤器类型, 请参阅文档"), nil)
			return dispatcher.EndGroups
		}
	}
	if err := user.WatchChat(ctx, database.WatchChat{
		UserID: user.ID,
		ChatID: chatID,
		Filter: filter,
	}); err != nil {
		logger.Errorf("Failed to watch chat %d: %s", chatID, err)
		ctx.Reply(update, ext.ReplyTextString("监听聊天失败: "+err.Error()), nil)
		return dispatcher.EndGroups
	}
	ctx.Reply(update, ext.ReplyTextString("已开始监听聊天: "+chatArg), nil)
	return dispatcher.EndGroups
}

func handleUnwatchCmd(ctx *ext.Context, update *ext.Update) error {
	logger := log.FromContext(ctx)
	args := strings.Split(string(update.EffectiveMessage.Text), " ")
	if len(args) < 2 {
		ctx.Reply(update, ext.ReplyTextString("请提供要取消监听的聊天ID或用户名"), nil)
		return dispatcher.EndGroups
	}
	userChatID := update.GetUserChat().GetID()
	user, err := database.GetUserByChatID(ctx, userChatID)
	if err != nil {
		logger.Errorf("获取用户失败: %s", err)
		ctx.Reply(update, ext.ReplyTextString("获取用户失败"), nil)
		return dispatcher.EndGroups
	}
	chatArg := args[1]
	chatID, err := tgutil.ParseChatID(ctx, chatArg)
	if err != nil {
		ctx.Reply(update, ext.ReplyTextString("无效的ID或用户名: "+err.Error()), nil)
		return dispatcher.EndGroups
	}
	if err := user.UnwatchChat(ctx, chatID); err != nil {
		logger.Errorf("Failed to unwatch chat %d: %s", chatID, err)
		ctx.Reply(update, ext.ReplyTextString("取消监听聊天失败: "+err.Error()), nil)
		return dispatcher.EndGroups
	}
	ctx.Reply(update, ext.ReplyTextString("已取消监听聊天: "+chatArg), nil)
	return dispatcher.EndGroups
}