/*
 * GLOBAL VARIABLE!
 * list of loaded scripts (only itself at start)
**/
var __scripts = [ 'main.js' ];
var __lang    = undefined;

async function load_lang()
{
	let language = navigator.language.slice(0,2).toLowerCase();
	if (!(['en', 'fr'].includes(language)))
	{
		language === 'en';
	}
	__lang = await fetch('./lang/'+language+'.json')
		.then((response) => response.json())
		.then((json) => { return json });
	console.info(_('success_load'));
}

/* i18n small function */
function _(content, replacements = {})
{
	if (typeof __lang !== 'undefined')
	{
		if (content in __lang)
		{
			content = __lang[content];
		}
	}
	if (Object.keys(replacements).length)
	{
		let tokens = content.split(/({[^}\\]*})/g);
		Object.keys(replacements).forEach((name) =>
		{
			if (tokens.includes('{'+name+'}'))
			{
				Object.keys(tokens).forEach((key) =>
				{
					if ('{'+name+'}' === tokens[key])
					{
						tokens[key] = replacements[name];
					}
				});
			}
		});
		content = tokens.join('');
	}
	return content;
}

/* include other scripts to the html file */
async function include(src, script_list)
{
	/* DOM operations */
	let script = document.createElement('script');
	script.setAttribute('src' , src              );
	document.getElementsByTagName('head')[0].appendChild(script);

	/* check if the element is added to the DOM */
	let script_loaded = new Promise( (resolve, reject) => {
		if (script !== undefined)
		{
			script.addEventListener('load', () => {
				resolve(0);
			});
		}
		else
		{
			reject(_('err_include', {src: src}))
		}
	} );

	script_list.push(src); // the script is considered as loaded

	return script_loaded.then(
		() =>
		{
			console.info(_(
				'script_load',
				{
					script: src,
				}            ,
			));
			return script_list
		},
		(error) => {
			throw error;
		}
	);
}

async function launch()
{
	await load_lang();
	__scripts = await include('./lichartee.js', __scripts);
	__scripts = await include('./test.js', __scripts);
}

launch()