// Package database define database operation functions
package database

import (
	"context"
	"sync"
	"time"

	"eventRT/config" //
	"eventRT/logger"

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

var (
	mongoOnce          sync.Once
	_globalMongoClient *mongo.Client
)

// GetMongoClient returns the global MongoDB client
func GetMongoClient() *mongo.Client {
	return _globalMongoClient
}

// InitMongoInstance return instance of MongoDB client
func InitMongoInstance(ctx context.Context, eCfg config.EventRTConfig) *mongo.Client {
	mongoOnce.Do(func() {
		_globalMongoClient = initMongoClient(ctx, eCfg.MongoDBURI, eCfg.Timeout)
	})
	return _globalMongoClient
}

// initMongoClient return successfully initialized MongoDB client
func initMongoClient(ctx context.Context, mongoDBURI string, timeout int) *mongo.Client {
	clientOptions := options.Client().ApplyURI(mongoDBURI)
	client, err := mongo.Connect(ctx, clientOptions)
	if err != nil {
		logger.Error(ctx, "failed to connect to MongoDB", "error", err)
		panic(err)
	}

	pingTimeout := time.Duration(timeout) * time.Second
	if pingTimeout == 0 {
		pingTimeout = 10 * time.Second
	}

	pingCtx, cancel := context.WithTimeout(ctx, pingTimeout)
	defer cancel()
	if err := client.Ping(pingCtx, nil); err != nil {
		logger.Error(ctx, "failed to ping operation with MongoDB", "error", err)
		panic(err)
	}

	return client
}