/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/

'use strict';

var defaultConfig = {},

/**
* Generates full path to file.
*
* @param {String} path - relative path to file.
*
* @returns {String} Full path to file
*/
getFullPath = function (path) {
return process.cwd() + '/' + path;
},

/**
* Returns file.
*
* @param {String} path - relative path to file.
*
* @returns {Object|Null} File or NULL
*/
getFile = function (path) {
try {
return require(getFullPath(path));
} catch (error) {
return null;
}
},

/**
* Immediately invoked function.
* Loads user config file.
*/
userConfig = (function () {
try {
return require(process.cwd() + '/grunt-config');
} catch (error) {
return null;
}
})();

module.exports = {

/**
* Loads file.
* Load priority:
* From user config;
* From default config with ".loc" suffix ;
* From default config;
*
* @param {String} alias
*
* @returns {Object} themes file or error
*/
get: function (alias) {
var tmp;

if (userConfig && userConfig[alias]) {
return require(getFullPath(userConfig[alias]));
} else if (tmp = getFile(defaultConfig[alias] + '.loc') || getFile(defaultConfig[alias])) {
return tmp;
} else {
throw new Error('Cannot find file. Alias "' + alias + '" not set. ' +
'Use "filesRouter.set" method to set it.').stack;
}
},

/**
* Sets file alias.
*
* @param {String} alias
* @param {String} path
*/
set: function (alias, path) {
defaultConfig[alias] = path;
}
};