// Copyright © 2023 OpenIM. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package relation

import (
	"context"

	"gorm.io/gorm"

	"github.com/OpenIMSDK/Open-IM-Server/pkg/common/db/table/relation"
	"github.com/OpenIMSDK/Open-IM-Server/pkg/utils"
)

type FriendGorm struct {
	*MetaDB
}

func NewFriendGorm(db *gorm.DB) relation.FriendModelInterface {
	return &FriendGorm{NewMetaDB(db, &relation.FriendModel{})}
}

func (f *FriendGorm) NewTx(tx any) relation.FriendModelInterface {
	return &FriendGorm{NewMetaDB(tx.(*gorm.DB), &relation.FriendModel{})}
}

// 插入多条记录.
func (f *FriendGorm) Create(ctx context.Context, friends []*relation.FriendModel) (err error) {
	return utils.Wrap(f.db(ctx).Create(&friends).Error, "")
}

// 删除ownerUserID指定的好友.
func (f *FriendGorm) Delete(ctx context.Context, ownerUserID string, friendUserIDs []string) (err error) {
	err = utils.Wrap(
		f.db(ctx).
			Where("owner_user_id = ? AND friend_user_id in ( ?)", ownerUserID, friendUserIDs).
			Delete(&relation.FriendModel{}).
			Error,
		"",
	)
	return err
}

// 更新ownerUserID单个好友信息 更新零值.
func (f *FriendGorm) UpdateByMap(
	ctx context.Context,
	ownerUserID string,
	friendUserID string,
	args map[string]interface{},
) (err error) {
	return utils.Wrap(
		f.db(ctx).Where("owner_user_id = ? AND friend_user_id = ? ", ownerUserID, friendUserID).Updates(args).Error,
		"",
	)
}

// 更新好友信息的非零值.
func (f *FriendGorm) Update(ctx context.Context, friends []*relation.FriendModel) (err error) {
	return utils.Wrap(f.db(ctx).Updates(&friends).Error, "")
}

// 更新好友备注（也支持零值 ）.
func (f *FriendGorm) UpdateRemark(ctx context.Context, ownerUserID, friendUserID, remark string) (err error) {
	if remark != "" {
		return utils.Wrap(
			f.db(ctx).
				Where("owner_user_id = ? and friend_user_id = ?", ownerUserID, friendUserID).
				Update("remark", remark).
				Error,
			"",
		)
	}
	m := make(map[string]interface{}, 1)
	m["remark"] = ""
	return utils.Wrap(f.db(ctx).Where("owner_user_id = ?", ownerUserID).Updates(m).Error, "")
}

// 获取单个好友信息，如没找到 返回错误.
func (f *FriendGorm) Take(
	ctx context.Context,
	ownerUserID, friendUserID string,
) (friend *relation.FriendModel, err error) {
	friend = &relation.FriendModel{}
	return friend, utils.Wrap(
		f.db(ctx).Where("owner_user_id = ? and friend_user_id", ownerUserID, friendUserID).Take(friend).Error,
		"",
	)
}

// 查找好友关系，如果是双向关系，则都返回.
func (f *FriendGorm) FindUserState(
	ctx context.Context,
	userID1, userID2 string,
) (friends []*relation.FriendModel, err error) {
	return friends, utils.Wrap(
		f.db(ctx).
			Where("(owner_user_id = ? and friend_user_id = ?) or (owner_user_id = ? and friend_user_id = ?)", userID1, userID2, userID2, userID1).
			Find(&friends).
			Error,
		"",
	)
}

// 获取 owner指定的好友列表 如果有friendUserIDs不存在，也不返回错误.
func (f *FriendGorm) FindFriends(
	ctx context.Context,
	ownerUserID string,
	friendUserIDs []string,
) (friends []*relation.FriendModel, err error) {
	return friends, utils.Wrap(
		f.db(ctx).Where("owner_user_id = ? AND friend_user_id in (?)", ownerUserID, friendUserIDs).Find(&friends).Error,
		"",
	)
}

// 获取哪些人添加了friendUserID 如果有ownerUserIDs不存在，也不返回错误.
func (f *FriendGorm) FindReversalFriends(
	ctx context.Context,
	friendUserID string,
	ownerUserIDs []string,
) (friends []*relation.FriendModel, err error) {
	return friends, utils.Wrap(
		f.db(ctx).Where("friend_user_id = ? AND owner_user_id in (?)", friendUserID, ownerUserIDs).Find(&friends).Error,
		"",
	)
}

// 获取ownerUserID好友列表 支持翻页.
func (f *FriendGorm) FindOwnerFriends(
	ctx context.Context,
	ownerUserID string,
	pageNumber, showNumber int32,
) (friends []*relation.FriendModel, total int64, err error) {
	err = f.DB.Model(&relation.FriendModel{}).Where("owner_user_id = ? ", ownerUserID).Count(&total).Error
	if err != nil {
		return nil, 0, utils.Wrap(err, "")
	}
	err = utils.Wrap(
		f.db(ctx).
			Where("owner_user_id = ? ", ownerUserID).
			Limit(int(showNumber)).
			Offset(int((pageNumber-1)*showNumber)).
			Find(&friends).
			Error,
		"",
	)
	return
}

// 获取哪些人添加了friendUserID 支持翻页.
func (f *FriendGorm) FindInWhoseFriends(
	ctx context.Context,
	friendUserID string,
	pageNumber, showNumber int32,
) (friends []*relation.FriendModel, total int64, err error) {
	err = f.DB.Model(&relation.FriendModel{}).Where("friend_user_id = ? ", friendUserID).Count(&total).Error
	if err != nil {
		return nil, 0, utils.Wrap(err, "")
	}
	err = utils.Wrap(
		f.db(ctx).
			Where("friend_user_id = ? ", friendUserID).
			Limit(int(showNumber)).
			Offset(int((pageNumber-1)*showNumber)).
			Find(&friends).
			Error,
		"",
	)
	return
}

func (f *FriendGorm) FindFriendUserIDs(ctx context.Context, ownerUserID string) (friendUserIDs []string, err error) {
	return friendUserIDs, utils.Wrap(
		f.db(ctx).
			Model(&relation.FriendModel{}).
			Where("owner_user_id = ? ", ownerUserID).
			Pluck("friend_user_id", &friendUserIDs).
			Error,
		"",
	)
}