package service

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

func CreateGeneralMessageService(from_id, to_id, msg_type, group_id int, content string) (error, uint) {
	// 业务逻辑
	var err error
	var id uint
	switch msg_type {
	case proto.MSG_TYPE_SIMPLE:
		//判断是否是好友,判断是否存在缓存，不存在则设置缓存，存在则判断是否是好友
		if worker.IsContainKey("user_"+strconv.Itoa(from_id)+"_friends") == false {
			//设置好友缓存
			isSuccess := SetFriendCache(from_id)
			//设置失败，直接查询数据库
			if !isSuccess {
				friend := dao.FindFriend(from_id, to_id)
				if len(friend) == 0 {
					return errors.New("未添加好友"), 0
				}
			} else {
				//判断是否是好友-redis方式
				is_f := worker.IsContainSet("user_"+strconv.Itoa(from_id)+"_friends", strconv.Itoa(to_id))
				if !is_f {
					return errors.New("未添加好友"), 0
				}
			}
		} else {
			//判断是否是好友-redis方式
			is_f := worker.IsContainSet("user_"+strconv.Itoa(from_id)+"_friends", strconv.Itoa(to_id))
			if !is_f {
				return errors.New("未添加好友"), 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 proto.MSG_TYPE_GROUP:
		if from_id == 0 || group_id == 0 || content == "" {
			return errors.New("参数错误"), 0
		}
		key := "group_" + strconv.Itoa(group_id) + "_users"
		//判断是否在群里
		if worker.IsContainKey(key) == false {
			//设置群缓存
			isSuccess := SetGroupCache(group_id)
			//设置失败，直接查询数据库
			if !isSuccess {
				groupUser := dao.FindGroupUser(from_id, group_id)
				if len(groupUser) == 0 {
					return errors.New("用户不在群里"), 0
				}
			} else {
				//判断该用户是否在群里-redis方式
				is_g := worker.IsContainSet("group_"+strconv.Itoa(group_id)+"_users", strconv.Itoa(from_id))
				if !is_g {
					return errors.New("用户不在群里"), 0
				}
			}
		} else {
			//判断该用户是否在群里-redis方式
			is_g := worker.IsContainSet("group_"+strconv.Itoa(group_id)+"_users", strconv.Itoa(from_id))
			if !is_g {
				return errors.New("用户不在群里"), 0
			}
		}

		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, group_id, content)
		//获取群里的用户
		user_ids := worker.GetRedisSetMembers("group_" + strconv.Itoa(group_id) + "_users")
		//users := dao.FindGroupUsers(group_id)
		for _, user_id := range user_ids {
			//判断是否是自己,不是则存入redis
			id_, _ := strconv.Atoi(user_id)
			if id_ == from_id {
				continue
			}
			res := worker.GetRedis("user_" + user_id + "_status_v2")
			if res == "1" {
				//在线,存入redis
				worker.PushRedisListWithExpire("user_"+user_id+"_msg_ids", strconv.Itoa(int(id)), time.Second*300)
			}
		}
	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, group_id, content)
	case proto.MSG_TYPE_FRIEND:
		res1 := dao.FindFriend(from_id, to_id)
		if len(res1) > 0 {
			// 已经有会话记录
			return errors.New("已是好友关系"), 0
		}
		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 errors.New("已有请求"), res[0].ID
		}
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, group_id, content)

	case proto.MSG_TYPE_GROUP_ADD:
		//加入群聊请求
		//判断是否在群里
		groupUser := dao.FindGroupUser(from_id, group_id)
		if len(groupUser) > 0 {
			return errors.New("已在群里"), 0
		}
		//查看是否已经发送过请求
		res, _ := dao.GetMsgUserGroupReq(from_id, group_id)
		if len(res) > 0 {
			return errors.New("已发送请求"), res[0].ID
		}
		err, id = dao.CreateGeneralMessage(from_id, to_id, msg_type, 0, group_id, content)

	case proto.MSG_TYPE_GROUP_INVI:
		//邀请加群，直接加入
		//判断邀请人是否在群里
		groupUser := dao.FindGroupUser(from_id, group_id)
		if len(groupUser) == 0 {
			return errors.New("邀请人不在群里"), 0
		}
		//判断被邀请人是否在群里
		groupUser = dao.FindGroupUser(to_id, group_id)
		if len(groupUser) > 0 {
			return errors.New("已在群里"), 0
		}
		err, id = dao.JoinGroup(group_id, to_id)
		if err == nil {
			//设置群缓存,如果存在缓存则加入
			if worker.IsContainKey("group_"+strconv.Itoa(group_id)+"_users") == true {
				//将用户加入群缓存
				worker.SetRedisSetAdd("group_"+strconv.Itoa(group_id)+"_users", strconv.Itoa(to_id))
			}
		}
	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, group_id int) ([]dao.Message, error) {
	// 业务逻辑
	var msgs []dao.Message
	var err error
	if index <= 0 || index > 100 {
		return nil, errors.New("index out of range")
	}
	if msq_type == proto.MSG_TYPE_FRIEND {
		from_id = from_user_id
	}
	msgs, err = dao.GetMsgUserByIndex(from_id, to_id, msq_type, index, 0)
	//群聊消息

	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 len(res) == 0 {
		return errors.New("no such message")
	}
	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)
		res2 := dao.AddFriend(from_user_id, to_user_id)
		if res2 == nil {
			//设置好友缓存
			if worker.IsContainKey("user_"+strconv.Itoa(from_user_id)+"_friends") == true {
				worker.SetRedisSetAdd("user_"+strconv.Itoa(from_user_id)+"_friends", strconv.Itoa(to_user_id))
			}
			if worker.IsContainKey("user_"+strconv.Itoa(to_user_id)+"_friends") == true {
				worker.SetRedisSetAdd("user_"+strconv.Itoa(to_user_id)+"_friends", strconv.Itoa(from_user_id))
			}
		}
		return res2
	} 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")
	}
}

func RejectFriendService(id, from_user_id, to_user_id int) error {
	// 业务逻辑
	res := dao.FindMessageByID(uint(id))
	if len(res) == 0 {
		return errors.New("no such message")
	}
	if res[0].FromUserID == to_user_id && res[0].ToUserID == from_user_id {
		dao.UpdateMessageStatus(res[0].ID, 1) // 拒绝,设为已读
		return nil
	} else {
		return errors.New("no such message,cannot reject 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
}

type FGRet struct {
	Friends []dao.FriendRet `json:"friends"`
	Groups  []dao.Group     `json:"groups"`
}

func GetFriendList(user_id int) FGRet {
	//获取好友id和群id
	friends := dao.FindFriends(user_id)
	groups := dao.FindGroups(user_id)
	var fg FGRet
	fg.Friends = friends
	fg.Groups = groups
	return fg
}

func GetFriendRequest(user_id int) []dao.FriendRequest {
	//获取好友请求
	users := dao.GetFriendRequest(user_id)
	return users
}

func DelFriendService(user_id, friend_id int) error {
	//删除好友
	err := dao.DeleteFriend(user_id, friend_id)
	//删除好友缓存
	if err == nil && worker.IsContainKey("user_"+strconv.Itoa(user_id)+"_friends") == true {
		worker.SetRedisSetRemove("user_"+strconv.Itoa(user_id)+"_friends", strconv.Itoa(friend_id))
	}
	return err
}

func QuitGroupService(user_id, group_id int) error {
	//退出群聊
	err := dao.QuitGroup(group_id, user_id)
	//删除群缓存
	if err == nil && worker.IsContainKey("group_"+strconv.Itoa(group_id)+"_users") == true {
		worker.SetRedisSetRemove("group_"+strconv.Itoa(group_id)+"_users", strconv.Itoa(user_id))
	}
	return err
}
func DelGroupService(user_id, group_id int) error {
	//查找群聊
	groups := dao.FindGroup(group_id)
	if len(groups) == 0 {
		return errors.New("no such group")
	}
	if groups[0].AuthID != user_id {
		return errors.New("no permission")
	}
	//删除群聊
	err := dao.DeleteGroup(group_id, user_id)
	err = dao.DeleteGroupUsers(group_id)
	return err
}

func GetGroups(user_id int) []dao.Group {
	//获取群聊
	groups := dao.GetGroups(user_id)
	return groups
}

func GetGroupByID(group_id int) []dao.Group {
	//获取群聊
	groups := dao.FindGroupByID(group_id)
	return groups
}

func GetGroupByNameLike(name string) []dao.Group {
	//获取群聊
	groups := dao.FindGroupByNameLike(name)
	return groups
}

func GetGroupRequestUsers(user_id int) []dao.FriendRequest {
	//获取群聊请求
	users := dao.GetGroupRequestUsers(user_id)
	return users
}

// 设置用户朋友关系缓存
func SetFriendCache(user_id int) bool {
	//获取好友id
	friends := dao.FindFriendsIDs(user_id)
	var ids []string
	for _, friend := range friends {
		ids = append(ids, strconv.Itoa(friend.FriendID))
	}
	res := worker.SetRedisSet("user_"+strconv.Itoa(user_id)+"_friends", ids, time.Hour*12)
	return res
}

// 设置用户群关系缓存
func SetGroupCache(group_id int) bool {
	//获取好友id
	users := dao.FindGroupUsers(group_id)
	var ids []string
	for _, user := range users {
		ids = append(ids, strconv.Itoa(user.UserID))
	}
	res := worker.SetRedisSet("group_"+strconv.Itoa(group_id)+"_users", ids, time.Hour*12)
	return res
}