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

	"github.com/openimsdk/protocol/constant"
	"github.com/openimsdk/tools/db/mongoutil"
	"github.com/openimsdk/tools/db/pagination"
	"github.com/openimsdk/tools/errs"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

func NewConversationMongo(db *mongo.Database) (*ConversationMgo, error) {
	coll := db.Collection(database.ConversationName)
	_, err := coll.Indexes().CreateOne(context.Background(), mongo.IndexModel{
		Keys: bson.D{
			{Key: "owner_user_id", Value: 1},
			{Key: "conversation_id", Value: 1},
		},
		Options: options.Index().SetUnique(true),
	})
	if err != nil {
		return nil, errs.Wrap(err)
	}
	version, err := NewVersionLog(db.Collection(database.ConversationVersionName))
	if err != nil {
		return nil, err
	}
	return &ConversationMgo{version: version, coll: coll}, nil
}

type ConversationMgo struct {
	version database.VersionLog
	coll    *mongo.Collection
}

func (c *ConversationMgo) Create(ctx context.Context, conversations []*model.Conversation) (err error) {
	return mongoutil.IncrVersion(func() error {
		return mongoutil.InsertMany(ctx, c.coll, conversations)
	}, func() error {
		userConversation := make(map[string][]string)
		for _, conversation := range conversations {
			userConversation[conversation.OwnerUserID] = append(userConversation[conversation.OwnerUserID], conversation.ConversationID)
		}
		for userID, conversationIDs := range userConversation {
			if err := c.version.IncrVersion(ctx, userID, conversationIDs, model.VersionStateInsert); err != nil {
				return err
			}
		}
		return nil
	})
}

func (c *ConversationMgo) UpdateByMap(ctx context.Context, userIDs []string, conversationID string, args map[string]any) (int64, error) {
	if len(args) == 0 || len(userIDs) == 0 {
		return 0, nil
	}
	filter := bson.M{
		"conversation_id": conversationID,
		"owner_user_id":   bson.M{"$in": userIDs},
	}
	var rows int64
	err := mongoutil.IncrVersion(func() error {
		res, err := mongoutil.UpdateMany(ctx, c.coll, filter, bson.M{"$set": args})
		if err != nil {
			return err
		}
		rows = res.ModifiedCount
		return nil
	}, func() error {
		for _, userID := range userIDs {
			if err := c.version.IncrVersion(ctx, userID, []string{conversationID}, model.VersionStateUpdate); err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		return 0, err
	}
	return rows, nil
}

func (c *ConversationMgo) Update(ctx context.Context, conversation *model.Conversation) (err error) {
	return mongoutil.IncrVersion(func() error {
		return mongoutil.UpdateOne(ctx, c.coll, bson.M{"owner_user_id": conversation.OwnerUserID, "conversation_id": conversation.ConversationID}, bson.M{"$set": conversation}, true)
	}, func() error {
		return c.version.IncrVersion(ctx, conversation.OwnerUserID, []string{conversation.ConversationID}, model.VersionStateUpdate)
	})
}

func (c *ConversationMgo) Find(ctx context.Context, ownerUserID string, conversationIDs []string) (conversations []*model.Conversation, err error) {
	return mongoutil.Find[*model.Conversation](ctx, c.coll, bson.M{"owner_user_id": ownerUserID, "conversation_id": bson.M{"$in": conversationIDs}})
}

func (c *ConversationMgo) FindUserID(ctx context.Context, userIDs []string, conversationIDs []string) ([]string, error) {
	return mongoutil.Find[string](
		ctx,
		c.coll,
		bson.M{"owner_user_id": bson.M{"$in": userIDs}, "conversation_id": bson.M{"$in": conversationIDs}},
		options.Find().SetProjection(bson.M{"_id": 0, "owner_user_id": 1}),
	)
}
func (c *ConversationMgo) FindUserIDAllConversationID(ctx context.Context, userID string) ([]string, error) {
	return mongoutil.Find[string](ctx, c.coll, bson.M{"owner_user_id": userID}, options.Find().SetProjection(bson.M{"_id": 0, "conversation_id": 1}))
}

func (c *ConversationMgo) Take(ctx context.Context, userID, conversationID string) (conversation *model.Conversation, err error) {
	return mongoutil.FindOne[*model.Conversation](ctx, c.coll, bson.M{"owner_user_id": userID, "conversation_id": conversationID})
}

func (c *ConversationMgo) FindConversationID(ctx context.Context, userID string, conversationIDs []string) (existConversationID []string, err error) {
	return mongoutil.Find[string](ctx, c.coll, bson.M{"owner_user_id": userID, "conversation_id": bson.M{"$in": conversationIDs}}, options.Find().SetProjection(bson.M{"_id": 0, "conversation_id": 1}))
}

func (c *ConversationMgo) FindUserIDAllConversations(ctx context.Context, userID string) (conversations []*model.Conversation, err error) {
	return mongoutil.Find[*model.Conversation](ctx, c.coll, bson.M{"owner_user_id": userID})
}

func (c *ConversationMgo) FindRecvMsgUserIDs(ctx context.Context, conversationID string, recvOpts []int) ([]string, error) {
	var filter any
	if len(recvOpts) == 0 {
		filter = bson.M{"conversation_id": conversationID}
	} else {
		filter = bson.M{"conversation_id": conversationID, "recv_msg_opt": bson.M{"$in": recvOpts}}
	}
	return mongoutil.Find[string](ctx, c.coll, filter, options.Find().SetProjection(bson.M{"_id": 0, "owner_user_id": 1}))
}

func (c *ConversationMgo) GetUserRecvMsgOpt(ctx context.Context, ownerUserID, conversationID string) (opt int, err error) {
	return mongoutil.FindOne[int](ctx, c.coll, bson.M{"owner_user_id": ownerUserID, "conversation_id": conversationID}, options.FindOne().SetProjection(bson.M{"recv_msg_opt": 1}))
}

func (c *ConversationMgo) GetAllConversationIDs(ctx context.Context) ([]string, error) {
	return mongoutil.Aggregate[string](ctx, c.coll, []bson.M{
		{"$group": bson.M{"_id": "$conversation_id"}},
		{"$project": bson.M{"_id": 0, "conversation_id": "$_id"}},
	})
}

func (c *ConversationMgo) GetAllConversationIDsNumber(ctx context.Context) (int64, error) {
	counts, err := mongoutil.Aggregate[int64](ctx, c.coll, []bson.M{
		{"$group": bson.M{"_id": "$conversation_id"}},
		{"$group": bson.M{"_id": nil, "count": bson.M{"$sum": 1}}},
		{"$project": bson.M{"_id": 0}},
	})
	if err != nil {
		return 0, err
	}
	if len(counts) == 0 {
		return 0, nil
	}
	return counts[0], nil
}

func (c *ConversationMgo) PageConversationIDs(ctx context.Context, pagination pagination.Pagination) (conversationIDs []string, err error) {
	return mongoutil.FindPageOnly[string](ctx, c.coll, bson.M{}, pagination, options.Find().SetProjection(bson.M{"conversation_id": 1}))
}

func (c *ConversationMgo) GetConversationsByConversationID(ctx context.Context, conversationIDs []string) ([]*model.Conversation, error) {
	return mongoutil.Find[*model.Conversation](ctx, c.coll, bson.M{"conversation_id": bson.M{"$in": conversationIDs}})
}

func (c *ConversationMgo) GetConversationIDsNeedDestruct(ctx context.Context) ([]*model.Conversation, error) {
	// "is_msg_destruct = 1 && msg_destruct_time != 0 && (UNIX_TIMESTAMP(NOW()) > (msg_destruct_time + UNIX_TIMESTAMP(latest_msg_destruct_time)) || latest_msg_destruct_time is NULL)"
	return mongoutil.Find[*model.Conversation](ctx, c.coll, bson.M{
		"is_msg_destruct":   1,
		"msg_destruct_time": bson.M{"$ne": 0},
		"$or": []bson.M{
			{
				"$expr": bson.M{
					"$gt": []any{
						time.Now(),
						bson.M{"$add": []any{"$msg_destruct_time", "$latest_msg_destruct_time"}},
					},
				},
			},
			{
				"latest_msg_destruct_time": nil,
			},
		},
	})
}

func (c *ConversationMgo) GetConversationNotReceiveMessageUserIDs(ctx context.Context, conversationID string) ([]string, error) {
	return mongoutil.Find[string](
		ctx,
		c.coll,
		bson.M{"conversation_id": conversationID, "recv_msg_opt": bson.M{"$ne": constant.ReceiveMessage}},
		options.Find().SetProjection(bson.M{"_id": 0, "owner_user_id": 1}),
	)
}

func (c *ConversationMgo) FindConversationUserVersion(ctx context.Context, userID string, version uint, limit int) (*model.VersionLog, error) {
	return c.version.FindChangeLog(ctx, userID, version, limit)
}