// 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"
	"time"

	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/database"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/model"
	"github.com/openimsdk/tools/utils/datautil"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"

	"github.com/openimsdk/tools/db/mongoutil"
	"github.com/openimsdk/tools/db/pagination"
	"github.com/openimsdk/tools/errs"
)

func NewGroupRequestMgo(db *mongo.Database) (database.GroupRequest, error) {
	coll := db.Collection(database.GroupRequestName)
	_, err := coll.Indexes().CreateMany(context.Background(), []mongo.IndexModel{
		{
			Keys: bson.D{
				{Key: "group_id", Value: 1},
				{Key: "user_id", Value: 1},
			},
			Options: options.Index().SetUnique(true),
		},
		{
			Keys: bson.D{
				{Key: "req_time", Value: -1},
			},
		},
	})
	if err != nil {
		return nil, errs.Wrap(err)
	}
	return &GroupRequestMgo{coll: coll}, nil
}

type GroupRequestMgo struct {
	coll *mongo.Collection
}

func (g *GroupRequestMgo) Create(ctx context.Context, groupRequests []*model.GroupRequest) (err error) {
	return mongoutil.InsertMany(ctx, g.coll, groupRequests)
}

func (g *GroupRequestMgo) Delete(ctx context.Context, groupID string, userID string) (err error) {
	return mongoutil.DeleteOne(ctx, g.coll, bson.M{"group_id": groupID, "user_id": userID})
}

func (g *GroupRequestMgo) UpdateHandler(ctx context.Context, groupID string, userID string, handledMsg string, handleResult int32) (err error) {
	return mongoutil.UpdateOne(ctx, g.coll, bson.M{"group_id": groupID, "user_id": userID}, bson.M{"$set": bson.M{"handle_msg": handledMsg, "handle_result": handleResult}}, true)
}

func (g *GroupRequestMgo) Take(ctx context.Context, groupID string, userID string) (groupRequest *model.GroupRequest, err error) {
	return mongoutil.FindOne[*model.GroupRequest](ctx, g.coll, bson.M{"group_id": groupID, "user_id": userID})
}

func (g *GroupRequestMgo) FindGroupRequests(ctx context.Context, groupID string, userIDs []string) ([]*model.GroupRequest, error) {
	return mongoutil.Find[*model.GroupRequest](ctx, g.coll, bson.M{"group_id": groupID, "user_id": bson.M{"$in": userIDs}})
}

func (g *GroupRequestMgo) sort() any {
	return bson.D{{Key: "req_time", Value: -1}}
}

func (g *GroupRequestMgo) Page(ctx context.Context, userID string, groupIDs []string, handleResults []int, pagination pagination.Pagination) (total int64, groups []*model.GroupRequest, err error) {
	filter := bson.M{"user_id": userID}
	if len(groupIDs) > 0 {
		filter["group_id"] = bson.M{"$in": datautil.Distinct(groupIDs)}
	}
	if len(handleResults) > 0 {
		filter["handle_result"] = bson.M{"$in": handleResults}
	}
	return mongoutil.FindPage[*model.GroupRequest](ctx, g.coll, filter, pagination, options.Find().SetSort(g.sort()))
}

func (g *GroupRequestMgo) PageGroup(ctx context.Context, groupIDs []string, handleResults []int, pagination pagination.Pagination) (total int64, groups []*model.GroupRequest, err error) {
	if len(groupIDs) == 0 {
		return 0, nil, nil
	}
	filter := bson.M{"group_id": bson.M{"$in": groupIDs}}
	if len(handleResults) > 0 {
		filter["handle_result"] = bson.M{"$in": handleResults}
	}
	return mongoutil.FindPage[*model.GroupRequest](ctx, g.coll, filter, pagination, options.Find().SetSort(g.sort()))
}

func (g *GroupRequestMgo) GetUnhandledCount(ctx context.Context, groupIDs []string, ts int64) (int64, error) {
	if len(groupIDs) == 0 {
		return 0, nil
	}
	filter := bson.M{"group_id": bson.M{"$in": groupIDs}, "handle_result": 0}
	if ts != 0 {
		filter["req_time"] = bson.M{"$gt": time.Unix(ts, 0)}
	}
	return mongoutil.Count(ctx, g.coll, filter)
}