const low = require('lowdb');
const FileSync = require('lowdb/adapters/FileSync');

var db = null;

function db_init(db){
	db.defaults({ chats:[]}).write();
}

var dbc = function(name){
	const db_file = "./db/"+name+".json";
	var db = low(new FileSync(db_file));
	db_init(db);
	return db;
};



module.exports = function(name){
	this.name = name;
	this.db = dbc(name);

	this.get_chat = function(cid){

		return new Promise((resolve, reject)=>{
			let res = this.db.get("chats").find({id:cid}).value();
			if(res) return resolve(res);

			this.db.get("chats").push({id:cid, tracking:[]}).write();
			res = this.db.get("chats").find({id:cid}).value();
			if(res) return resolve(res);

			return reject({error:true, msg:"Error With DB..."});
		});
	};

	this.dump_db = function(){
		return new Promise((resolve, reject)=>{
			resolve(this.db.get("chats").value());
		});
	};

	this.set_v = function(cid,v){
		return new Promise((resolve, reject)=>{
			resolve(this.db.find({id:cid}).set('tracking',v).write());
		});
	};

	this.get_v = function(cid){
		return new Promise((resolve, reject)=>{
			resolve(this.db.find({id:cid}).value().tracking);
		});
	}

	return this;
};