#!/usr/bin/env node

var
	app,
	modulesPath = process.env.WAPPALYZER_NODE_PATH !== undefined ? process.env.WAPPALYZER_NODE_PATH + '/node_modules/' : '',
	fs          = require('fs'),
	fileType    = require(modulesPath + 'file-type'),
	readChunk   = require(modulesPath + 'read-chunk')
	isSvg       = require(modulesPath + 'is-svg')
	json        = require(process.env.WAPPALYZER_ROOT + '/src/apps.json');

for (app in json.apps) {
	(function(app) {
		var basePath = process.env.WAPPALYZER_ROOT + '/src/icons/';
		var iconPath = json.apps[app].icon || 'default.svg';
		var path = basePath + iconPath;

		var type;
		if (path.substr(path.length - 4) === '.png') {
			type = "PNG";
		}
		else if (path.substr(path.length - 4) === '.svg') {
			type = "SVG";
		}
		else {
			var err = new Error('Icon file extension specified for app "' + app + '" is not ".png" or ".svg": src/icons/' + iconPath);
			throw err;
		}

		fs.exists(path, function(exists) {
			if (exists) {
				if (type === "PNG") {
					var buffer = fileType(readChunk.sync(path, 0, 262));
					if (buffer === null) {
						var err = new Error('Unknown mimetype or bad file for "' + app + '": src/icons/' + iconPath);
						throw err;
					}
					else if (buffer.mime !== 'image/png') {
						var err = new Error('Incorrect mimetype "' + buffer.mime + '" when expected PNG for app "' + app + '": src/icons/' + iconPath);
						throw err;
					}
				}
				else if (type === "SVG") {
					if (!isSvg(fs.readFileSync(path))) {
						var err = new Error('Incorrect mimetype when expected SVG for app "' + app + '": src/icons/' + iconPath);
						throw err;
					}
				}
			} else {
				var err = new Error('Missing file for app "' + app + '": src/icons/' + iconPath);
				throw err;
			}
		});
	}(app));
};