/*
 license: The MIT License, Copyright (c) 2016-2017 YUKI "Piro" Hiroshi
 original:
   http://github.com/piroor/webextensions-lib-l10n
*/

var l10n = {
	updateString(aString) {
		return aString.replace(/__MSG_(.+?)__/g, function(aMatched) {
			var key = aMatched.slice(6, -2);
			return chrome.i18n.getMessage(key);
		});
	},

	$log(aMessage, ...aArgs) {
		aMessage = 'l10s ' + aMessage;
		if (typeof log === 'function')
			log(aMessage, ...aArgs);
		else
			console.log(aMessage, ...aArgs);
	},

	updateDocument() {
		var texts = document.evaluate(
				'descendant::text()[contains(self::text(), "__MSG_")]',
				document,
				null,
				XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
				null
			);
		for (let i = 0, maxi = texts.snapshotLength; i < maxi; i++)
		{
			let text = texts.snapshotItem(i);
			text.nodeValue = this.updateString(text.nodeValue);
		}

		var attributes = document.evaluate(
				'descendant::*/attribute::*[contains(., "__MSG_")]',
				document,
				null,
				XPathResult.ORDERED_NODE_SNAPSHOT_TYPE,
				null
			);
		for (let i = 0, maxi = attributes.snapshotLength; i < maxi; i++)
		{
			let attribute = attributes.snapshotItem(i);
			this.$log('apply', attribute);
			attribute.value = this.updateString(attribute.value);
		}
	}
};

document.addEventListener('DOMContentLoaded', function onReady() {
	document.removeEventListener('DOMContentLoaded', onReady);
	l10n.updateDocument();
});