<?php

namespace FluentForm\Framework\Foundation;

use FluentForm\App\Modules\Activator;
use FluentForm\App\Modules\Deactivator;
use FluentForm\Framework\Foundation\Application;

class Bootstrap
{
	/**
	 * The main plugin file path
	 * @var strring
	 */
	protected static $file = null;

	/**
	 * The base dir path of the plugin
	 * @var strring
	 */
	protected static $basePath = null;

	/**
	 * The app config (/config/app.php)
	 * @var strring
	 */
	protected static $config = array();

	/**
	 * Conveniently start the framework
	 * @param  string $file
	 * @return $ */
	public static function run($file)
	{
		static::init($file);
		static::registerHooks();
		static::registerAutoLoader();
		static::registerApplication();
	}

	/**
	 * Initialize the framework
	 * @param  string $file [the main plugin file path]
	 * @return void
	 */
	public static function init($file)
	{
		static::$file = $file;

		static::$basePath = plugin_dir_path($file);

		if (file_exists($activator = static::$basePath.'app/Modules/Activator.php')) {
			include_once $activator;
		}

		if (file_exists($deactivator = static::$basePath.'app/Modules/Deactivator.php')) {
			include_once $deactivator;
		}
	}

	/**
	 * Register activation/deactivation hooks
	 * @return void
	 */
	public static function registerHooks()
	{
		static::registerActivationHook();
		static::registerDeactivationHook();
	}

	/**
	 * Register activation hook
	 * @return bool
	 */
	public static function registerActivationHook()
	{
		return register_activation_hook(
			static::$file, array(__CLASS__, 'activate')
		);
	}

	/**
	 * Register deactivation hook
	 * @return bool
	 */
	public static function registerDeactivationHook()
	{
		return register_deactivation_hook(
			static::$file, array(__CLASS__, 'deactivate')
		);
	}

	/**
	 * Validate and activate the plugin
	 * @return void
	 */
	public static function activate()
	{
		static::validatePlugin();
		if (class_exists('FluentForm\App\Modules\Activator')) {
			(new Activator)->handleActivation(static::$file);
		}
	}

	/**
	 * Deactivate the plugin
	 * @return void
	 */
	public static function deactivate()
	{
		// Framework specific implementation if necessary...
		if (class_exists('FluentForm\App\Modules\Deactivator')) {
			(new Deactivator)->handleDeactivation(static::$file);
		}
	}

	/**
	 * Validate the plugin by checking all rquired files/settings
	 * @return void
	 */
	public static function validatePlugin()
	{
		if(!file_exists($glueJson = static::$basePath.'glue.json')) {
	        die('The [glue.json] file is missing from "'.$basePath.'" directory.');
	    }

	    static::$config = json_decode(file_get_contents($glueJson), true);

		$configPath = static::$basePath.'config';

		if(!file_exists($file = $configPath.'/app.php')) {
	        die('The [config.php] file is missing from "'.$configPath.'" directory.');
	    }

	    static::$config = array_merge(include $file, static::$config);

	    if (!($autoload = @static::$config['autoload'])) {
	        die('The [autoload] key is not specified or invalid in "'.$glueJson.'" file.');
	    }

	    if (!($namespace = @$autoload['namespace'])) {
	        die('The [namespace] key is not specified or invalid in "'.$glueJson.'" file.');
	    }

	    $namespaceMapping = @$autoload['mapping'];

	    if (!($namespaceMapping || empty((array) $namespaceMapping))) {
	        die('The [mapping] key is not specified or invalid in "'.$glueJson.'" file.');
	    }
	}

	/**
	 * Register the autoloader
	 * @return void
	 */
	public static function registerAutoLoader()
	{
		if (!static::$config) {
			static::$config = json_decode(file_get_contents(static::$basePath.'glue.json'), true);
	    	static::$config = array_merge(include static::$basePath.'config/app.php', static::$config);
		}

		spl_autoload_register([__CLASS__, 'loader']);
	}

	/**
	 * Framework's custom autoloader
	 * @param  string $class
	 * @return mixed
	 */
	public static function loader($class)
	{
		$namespace = static::$config['autoload']['namespace'];

		if(substr($class, 0, strlen($namespace)) !== $namespace) {
			return false;
		}

        foreach (static::$config['autoload']['mapping'] as $key => $value) {
        	$className = str_replace(
        		array('\\', $key, $namespace),
        		array('/', $value, ''),
        		$class
        	);

            $file = static::$basePath.trim($className, '/').'.php';
            
            if (is_readable($file)) {
	            return include $file;
	        }
        }
	}

	/**
	 * Register "plugins_loaded" hook to run the plugin
	 * @return void
	 */
	public static function registerApplication()
	{
		add_action('plugins_loaded', function() {
			return new Application(static::$file, static::$config);
		});
	}
}