#!/usr/bin/env node

var
	app,
	fs        = require('fs'),
	fileType  = require('../node_modules/file-type'),
	readChunk = require('../node_modules/read-chunk')
	isSvg     = require('../node_modules/is-svg')
	json      = require('../src/apps.json');

for (app in json.apps) {
	(function(app) {
		var
			basePath = 'src/icons/';
			iconPath = json.apps[app].icon || 'default.svg';
			path     = basePath + iconPath,
			ext      = iconPath.substr(iconPath.length - 4);

		if ( ext !== '.png' && ext !== '.svg' ) {
			throw err = new Error('Icon file extension specified for app "' + app + '" is not ".png" or ".svg": src/icons/' + iconPath);
		}

		fs.exists(path, function(exists) {
			if ( exists ) {
				if ( ext === '.png' ) {
					var buffer = fileType(readChunk.sync(path, 0, 262));

					if ( buffer === null ) {
						throw new Error('Unknown mimetype or bad file for "' + app + '": src/icons/' + iconPath);
					} else if ( buffer.mime !== 'image/png' ) {
						throw new Error('Incorrect mimetype "' + buffer.mime + '" when expected PNG for app "' + app + '": src/icons/' + iconPath);
					}
				} else if ( ext === '.svg' ) {
					if ( !isSvg(fs.readFileSync(path)) ) {
						throw new Error('Incorrect mimetype when expected SVG for app "' + app + '": src/icons/' + iconPath);
					}
				}
			} else {
				throw Error('Missing file for app "' + app + '": src/icons/' + iconPath);
			}
		});
	}(app));
}