package service

import (
	"errors"
	"strconv"
	"time"
	"videoplayer/dao"
	"videoplayer/worker"
)

func CreateGeneralMessageService(from_id, to_id, msg_type int, content string) (error, uint) {
	// 业务逻辑
	var err error
	var id uint
	switch msg_type {
	case 1:
		//判断是否是好友
		friend := dao.FindFriend(from_id, to_id)
		if len(friend) == 0 {
			return errors.New("not a friend"), 0
		}
		err, id = dao.CreateSimpleMessage(from_id, to_id, content)
		res := worker.GetRedis("user_" + strconv.Itoa(to_id) + "_status_v2")
		if res == "1" {
			//在线,存入redis
			worker.PushRedisListWithExpire("user_"+strconv.Itoa(to_id)+"_msg_ids", strconv.Itoa(int(id)), time.Second*300)
		}
	case 2:
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, 0, content)
	case 3:
		//user := dao.FindUserByID(to_id)
		// 系统消息,需要管理员权限
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, 0, content)
	case 4:
		res, _ := dao.GetMsgUserByIndex(from_id, to_id, 4, 1, 0)
		if len(res) > 0 {
			// 已经有会话记录,返回会话id
			return nil, res[0].ID
		}
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, 0, content)
	case 5:
		res, _ := dao.GetMsgUserByIndex(from_id, to_id, 5, 1, 0)
		if len(res) > 0 {
			// 已经有会话记录
			return errors.New("already have a conversation"), 0
		}
		//邀请加入群聊请求
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, from_id, content)
	default:
		// 未知消息类型
		err = errors.New("unknown message type")
	}
	return err, id
}

func GetMsgUserByIndexService(from_id, to_id, index, msq_type, from_user_id int) ([]dao.Message, error) {
	// 业务逻辑
	if index <= 0 || index > 100 {
		return nil, errors.New("index out of range")
	}
	if msq_type == 4 {
		from_id = from_user_id
	}
	msgs, err := dao.GetMsgUserByIndex(from_id, to_id, msq_type, index, 0)
	return msgs, err
}

// AddFriendService 通过消息id添加好友,和加入群聊
// id 消息id
// from_user_id 发送消息的用户id
// to_user_id 接收消息的用户id,及接受用户id
func AddFriendService(id, from_user_id, to_user_id int) error {
	// 业务逻辑
	res := dao.FindMessageByID(uint(id))
	if res[0].FromUserID == to_user_id && res[0].ToUserID == from_user_id {
		friend := dao.FindFriend(from_user_id, to_user_id)
		if len(friend) > 0 {
			return errors.New("already a friend")
		}
		dao.UpdateMessageStatus(res[0].ID, 1)
		return dao.AddFriend(from_user_id, to_user_id)
	} else if res[0].ToUserID == from_user_id && res[0].GroupID == to_user_id {
		//加入群聊
		//查看是否已经加入
		groupUser := dao.FindGroupUser(from_user_id, to_user_id)
		if len(groupUser) > 0 {
			return errors.New("already in the group")
		}
		err := dao.JoinGroup(groupUser[0].GroupID, to_user_id)
		if err != nil {
			return err
		}
		err = dao.UpdateMessageStatus(res[0].ID, 1)
		return err
	} else {
		return errors.New("no such message,cannot add friend")
	}
}

// CreateGroup 创建群聊
// groupName 群聊名称
// groupInfo 群聊信息
// groupType 群聊类型
// groupIcon 群聊图标
// user_id 创建群的用户id
func CreateGroup(groupName, groupInfo, groupType, groupIcon string, user_id int) (error, uint) {
	// 业务逻辑
	err, id := dao.CreateGroup(groupName, groupInfo, groupType, groupIcon, user_id)
	return err, id
}