var methods = {};
let fs = require('fs');
let util = require('util');


// save new line to file
newLine = (prefix, obj) => {
	let date = new Date(); // current date
	let filename = global['gds'].cfg.log.filename(); // filename
	let dir = global['gds'].cfg.log.directory(); // directory
	let path = dir + filename; // filepath
	let fs_options = { // fs options for encoding, file mode and file flag
		encoding: "utf8",
		flag: "a+" // Open file for reading and appending. The file is created if it does not exist.
	};
	let date_string =
		("0" + date.getUTCHours()).slice(-2) + ":" +
		("0" + date.getUTCMinutes()).slice(-2) + ":" +
		("0" + date.getUTCSeconds()).slice(-2);

	// directory not existing; create directory
	if(!fs.existsSync(dir)) {
		fs.mkdir(dir, (err) => {
			if(err) throw err;
		});
	}


	// type matching
	if(
		typeof obj == "string" ||
		typeof obj == "number" ||
		typeof obj == "boolean"
	) fs.appendFileSync(path, prefix + " " + date_string + " | " + obj + "\n", fs_options);
	else
	if(typeof obj == "object") {
		let lines = JSON.stringify(obj, null, '\t'); // prettyprint obj as JSON
		lines.split(/\r?\n/).forEach((line) => { // for each linebreak (\r | \n)
			fs.appendFileSync(path, prefix + " " + date_string + " | " + line + "\n", fs_options);
		});
	} else {
		// do nothing; not supported
		// typeof obj == "symbol"
		// typeof obj == "undefined"
		// typeof obj == "function"
	}
};

fallback = (fn, ...data) => {
	if(data.length == 1) data = data[0];

	fn.apply(null, data);
}


// LOG | INFO
methods.log = (...data) => {
	if(global['modules'].cli) global['modules'].cli.log.apply(global['modules'].cli, data);
	else fallback(console.log, data);

	if(data.length == 1) data = data[0];
	newLine("  [LOG]", data);
};
methods.info = methods.log;

// WARNING
methods.warn = (...data) => {
	if(global['modules'].cli) global['modules'].cli.log.apply(global['modules'].cli, data);
	else fallback(console.warn, data);

	if(data.length == 1) data = data[0];
	newLine(" [WARN]", data);
};

// ERROR
methods.error = (...data) => {
	if(global['modules'].cli) global['modules'].cli.log.apply(global['modules'].cli, data);
	else fallback(console.error, data);

	if(data.length == 1) data = data[0];
	newLine("[ERROR]", data);
};
methods.err = methods.error;

// DEBUG
methods.debug = (...data) => {
	if(global['gds'].debug) {
		if(global['modules'].cli) global['modules'].cli.log.apply(global['modules'].cli, data);
		else fallback(console.log, data);

		if(data.length == 1) data = data[0];
		newLine("[DEBUG]", data);
	}
};

module.exports = methods;