// 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 mgo

import (
	"context"
	"github.com/OpenIMSDK/protocol/user"
	"time"

	"github.com/OpenIMSDK/tools/mgoutil"
	"github.com/OpenIMSDK/tools/pagination"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"

	"github.com/openimsdk/open-im-server/v3/pkg/common/db/table/relation"
)

func NewUserMongo(db *mongo.Database) (relation.UserModelInterface, error) {
	coll := db.Collection("user")
	_, err := coll.Indexes().CreateOne(context.Background(), mongo.IndexModel{
		Keys: bson.D{
			{Key: "user_id", Value: 1},
		},
		Options: options.Index().SetUnique(true),
	})
	if err != nil {
		return nil, err
	}
	return &UserMgo{coll: coll}, nil
}

type UserMgo struct {
	coll *mongo.Collection
}

func (u *UserMgo) Create(ctx context.Context, users []*relation.UserModel) error {
	return mgoutil.InsertMany(ctx, u.coll, users)
}

func (u *UserMgo) UpdateByMap(ctx context.Context, userID string, args map[string]any) (err error) {
	if len(args) == 0 {
		return nil
	}
	return mgoutil.UpdateOne(ctx, u.coll, bson.M{"user_id": userID}, bson.M{"$set": args}, true)
}

func (u *UserMgo) Find(ctx context.Context, userIDs []string) (users []*relation.UserModel, err error) {
	return mgoutil.Find[*relation.UserModel](ctx, u.coll, bson.M{"user_id": bson.M{"$in": userIDs}})
}

func (u *UserMgo) Take(ctx context.Context, userID string) (user *relation.UserModel, err error) {
	return mgoutil.FindOne[*relation.UserModel](ctx, u.coll, bson.M{"user_id": userID})
}

func (u *UserMgo) TakeNotification(ctx context.Context, level int64) (user []*relation.UserModel, err error) {
	return mgoutil.Find[*relation.UserModel](ctx, u.coll, bson.M{"app_manger_level": level})
}

func (u *UserMgo) TakeByNickname(ctx context.Context, nickname string) (user []*relation.UserModel, err error) {
	return mgoutil.Find[*relation.UserModel](ctx, u.coll, bson.M{"nickname": nickname})
}

func (u *UserMgo) Page(ctx context.Context, pagination pagination.Pagination) (count int64, users []*relation.UserModel, err error) {
	return mgoutil.FindPage[*relation.UserModel](ctx, u.coll, bson.M{}, pagination)
}

func (u *UserMgo) GetAllUserID(ctx context.Context, pagination pagination.Pagination) (int64, []string, error) {
	return mgoutil.FindPage[string](ctx, u.coll, bson.M{}, pagination, options.Find().SetProjection(bson.M{"user_id": 1}))
}

func (u *UserMgo) Exist(ctx context.Context, userID string) (exist bool, err error) {
	return mgoutil.Exist(ctx, u.coll, bson.M{"user_id": userID})
}

func (u *UserMgo) GetUserGlobalRecvMsgOpt(ctx context.Context, userID string) (opt int, err error) {
	return mgoutil.FindOne[int](ctx, u.coll, bson.M{"user_id": userID}, options.FindOne().SetProjection(bson.M{"global_recv_msg_opt": 1}))
}

func (u *UserMgo) CountTotal(ctx context.Context, before *time.Time) (count int64, err error) {
	if before == nil {
		return mgoutil.Count(ctx, u.coll, bson.M{})
	}
	return mgoutil.Count(ctx, u.coll, bson.M{"create_time": bson.M{"$lt": before}})
}

func (u *UserMgo) AddUserCommand(ctx context.Context, userID string, Type int32, UUID string, value string) error {
	collection := u.coll.Database().Collection("userCommands")

	// Create a new document instead of updating an existing one
	doc := bson.M{
		"userID":     userID,
		"type":       Type,
		"uuid":       UUID,
		"createTime": time.Now().Unix(), // assuming you want the creation time in Unix timestamp
		"value":      value,
	}

	_, err := collection.InsertOne(ctx, doc)
	return err
}
func (u *UserMgo) DeleteUserCommand(ctx context.Context, userID string, Type int32, UUID string) error {
	collection := u.coll.Database().Collection("userCommands")

	filter := bson.M{"userID": userID, "type": Type, "uuid": UUID}

	_, err := collection.DeleteOne(ctx, filter)
	return err
}
func (u *UserMgo) UpdateUserCommand(ctx context.Context, userID string, Type int32, UUID string, value string) error {
	collection := u.coll.Database().Collection("userCommands")

	filter := bson.M{"userID": userID, "type": Type, "uuid": UUID}
	update := bson.M{"$set": bson.M{"value": value}}

	_, err := collection.UpdateOne(ctx, filter, update)
	return err
}
func (u *UserMgo) GetUserCommand(ctx context.Context, userID string, Type int32) ([]*user.CommandInfoResp, error) {
	collection := u.coll.Database().Collection("userCommands")
	filter := bson.M{"userID": userID, "type": Type}

	cursor, err := collection.Find(ctx, filter)
	if err != nil {
		return nil, err
	}
	defer cursor.Close(ctx)

	// Initialize commands as a slice of pointers
	commands := []*user.CommandInfoResp{}

	for cursor.Next(ctx) {
		var document struct {
			UUID       string `bson:"uuid"`
			Value      string `bson:"value"`
			CreateTime int64  `bson:"createTime"`
		}

		if err := cursor.Decode(&document); err != nil {
			return nil, err
		}

		commandInfo := &user.CommandInfoResp{ // Change here: use a pointer to the struct
			Uuid:       document.UUID,
			Value:      document.Value,
			CreateTime: document.CreateTime,
		}

		commands = append(commands, commandInfo)
	}

	if err := cursor.Err(); err != nil {
		return nil, err
	}

	return commands, nil
}

func (u *UserMgo) CountRangeEverydayTotal(ctx context.Context, start time.Time, end time.Time) (map[string]int64, error) {
	pipeline := bson.A{
		bson.M{
			"$match": bson.M{
				"create_time": bson.M{
					"$gte": start,
					"$lt":  end,
				},
			},
		},
		bson.M{
			"$group": bson.M{
				"_id": bson.M{
					"$dateToString": bson.M{
						"format": "%Y-%m-%d",
						"date":   "$create_time",
					},
				},
				"count": bson.M{
					"$sum": 1,
				},
			},
		},
	}
	type Item struct {
		Date  string `bson:"_id"`
		Count int64  `bson:"count"`
	}
	items, err := mgoutil.Aggregate[Item](ctx, u.coll, pipeline)
	if err != nil {
		return nil, err
	}
	res := make(map[string]int64, len(items))
	for _, item := range items {
		res[item.Date] = item.Count
	}
	return res, nil
}