const { MongoClient } = require('mongodb')

global.mconn = null
global.mdb = null
module.exports = {
	conn: () => {
		if (mconn !== null)
			return mconn
		const dbhost = process.env.DB_HOST || 'db'
		mconn = new MongoClient(`mongodb://${dbhost}:27017`, {
			useUnifiedTopology: true,
			useNewUrlParser: true
		})
		return mconn
	},
	get: () => {
		mdb = mconn.db(process.env.DB_NAME || 'fedilove')
		return mdb
	},
	table: {
		objects:		() => { return mdb.collection('objects') },
		users:			() => { return mdb.collection('u__users') },
		sessions:		() => { return mdb.collection('u__sessions') },
		quizs:			() => { return mdb.collection('u__quizs') },
	},
	getAPObject: async (objID, checkType) => {
		const object = await module.exports.table
			.objects().findOne({ id: objID })
		if (object === null)
			return null
		if (checkType !== undefined &&
			object.type !== checkType)
			return null
		return object
	},
}