<?php if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly

/**
 * The core plugin class
 *
 * @package Simply_Static
 */
class Simply_Static {
	/**
	 * Plugin version
	 *
	 * @var string
	 */
	const VERSION = '2.0.0';

	/**
	 * The slug of the plugin; used in actions, filters, i18n, etc.
	 *
	 * @var string
	 */
	const SLUG = 'simply-static-s3';

	/**
	 * Singleton instance
	 *
	 * @var Simply_Static
	 */
	protected static $instance = null;

	/**
	 * An instance of the options structure containing all options for this plugin
	 *
	 * @var Simply_Static_Options
	 */
	protected $options = null;

	/**
	 * View object
	 *
	 * @var Simply_Static_View
	 */
	protected $view = null;

	/**
	 * Disable usage of "new"
	 *
	 * @return void
	 */
	protected function __construct() {}

	/**
	 * Disable cloning of the class
	 *
	 * @return void
	 */
	protected function __clone() {}

	/**
	 * Disable unserializing of the class
	 *
	 * @return void
	 */
	public function __wakeup() {}

	/**
	 * Return an instance of the Simply Static plugin
	 *
	 * @return Simply_Static
	 */
	public static function instance()
	{
		if ( null === self::$instance )
		{
			self::$instance = new self();
			self::$instance->includes();
			self::$instance->options = new Simply_Static_Options( self::SLUG );
			self::$instance->view = new Simply_Static_View();

			// Load the text domain for i18n
			add_action( 'plugins_loaded', array( self::$instance, 'load_textdomain' ) );
			// Enqueue admin styles
			add_action( 'admin_enqueue_scripts', array( self::$instance, 'enqueue_admin_styles' ) );
			// Enqueue admin scripts
			add_action( 'admin_enqueue_scripts', array( self::$instance, 'enqueue_admin_scripts' ) );
			// Add the options page and menu item.
			add_action( 'admin_menu', array( self::$instance, 'add_plugin_admin_menu' ), 2 );
		}

		return self::$instance;
	}

	/**
	 * Initialize singleton instance
	 *
	 * @param string $bootstrap_file
	 * @return Simply_Static
	 */
	public static function init( $bootstrap_file )
	{
		$instance = self::instance();

		// Activation
		register_activation_hook( $bootstrap_file, array( $instance, 'activate' ) );

		return $instance;
	}

	/**
	 * Performs activation
	 *
	 * @return void
	 */
	public function activate()
	{
		// Not installed?
		if ( null === $this->options->get( 'version' ) ) {
			$this->options
				->set( 'version', self::VERSION )
				->set( 'destination_scheme', sist_get_origin_scheme() )
				->set( 'destination_host', sist_get_origin_host() )
				->set( 'temp_files_dir', trailingslashit( plugin_dir_path( dirname( __FILE__ ) ) . 'static-files' ) )
				->set( 'additional_urls', '' )
				->set( 'delivery_method', 's3' )
				->set( 'local_dir', '' )
				->set( 'delete_temp_files', '1' )
				->set( 'aws_s3_bucket', '' )
				->set( 'aws_access_key_id', '' )
				->set( 'aws_secret_access_key', '' )
				->set( 'aws_s3_region', 'us-east-1' )
				->set( 'aws_s3_endpoint', 's3.amazonaws.com' )
				->save();
		}
	}

	/**
	 * Include required files
	 *
	 * @return void
	 */
	private function includes() {
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/libraries/phpuri.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/libraries/S3.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-options.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-view.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-url-extractor.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-url-fetcher.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-url-response.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/class-simply-static-archive-creator.php';
		require plugin_dir_path( dirname( __FILE__ ) ) . 'includes/misc-functions.php';
	}

	/**
	 * Enqueue admin-specific style sheets for this plugin's admin pages only
	 *
	 * @return null Return early if no settings page is registered.
	 */
	public function enqueue_admin_styles() {
		// Plugin admin CSS. Tack on plugin version.
		wp_enqueue_style( self::SLUG . '-admin-styles', plugin_dir_url( dirname( __FILE__ ) ) . 'css/admin.css', array(), self::VERSION );
	}

	/**
	 * Enqueue admin-specific javascript files for this plugin's admin pages only
	 *
	 * @return null Return early if no settings page is registered.
	 */
	public function enqueue_admin_scripts() {
		// Plugin admin CSS. Tack on plugin version.
		wp_enqueue_script( self::SLUG . '-admin-styles', plugin_dir_url( dirname( __FILE__ ) ) . 'js/admin.js', array(), self::VERSION );
	}

	/**
	 * Register the administration menu for this plugin into the WordPress Dashboard menu.
	 *
	 * @return void
	 */
	public function add_plugin_admin_menu() {
		// Base 64 encoded SVG image.
		$icon_svg = 'data:image/svg+xml;base64,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';

		// Add main menu item
		add_menu_page(
			__( 'Simply Static S3 Settings', self::SLUG ),
			__( 'Simply Static S3', self::SLUG ),
			'manage_options',
			self::SLUG,
			array( self::$instance, 'display_generate_page' ),
			$icon_svg
		);

		add_submenu_page(
			self::SLUG,
			__( 'Generate Static Site', self::SLUG ),
			__( 'Generate', self::SLUG ),
			'manage_options',
			self::SLUG,
			array( self::$instance, 'display_generate_page' )
		);

		add_submenu_page(
			self::SLUG,
			__( 'Simply Static S3 Settings', self::SLUG ),
			__( 'Settings', self::SLUG ),
			'manage_options',
			self::SLUG . '-options',
			array( self::$instance, 'display_options_page' )
		);
	}

	/**
	 * Render the page for generating a static site.
	 *
	 * @return void
	 */
	public function display_generate_page() {
		if ( $this->check_system_requirements() ) {
			$this->view->assign( 'system_requirements_check_failed', true );
		}

		if ( isset( $_POST['generate'] ) ) {
			$archive_creator = new Simply_Static_Archive_Creator(
				self::SLUG,
				$this->options->get( 'destination_scheme' ),
				$this->options->get( 'destination_host' ),
				$this->options->get( 'temp_files_dir' ),
				$this->options->get( 'additional_urls' )
			);
			$archive_creator->create_archive();

			// TODO: archive_url could be a WP_Error
			if ( $this->options->get( 'delivery_method' ) == 'zip' ) {

				$archive_url = $archive_creator->create_zip();
				if ( is_wp_error( $archive_url ) ) {
					$error = $archive_url->get_error_message();
					$this->view->add_flash( 'error', $error );
				} else {
					$message = __( 'ZIP archive created: ', self::SLUG );
					$message .= ' <a href="' . $archive_url . '">' . __( 'Click here to download', self::SLUG ) . '</a>';
					$this->view->add_flash( 'updated', $message );
				}

			} elseif ( $this->options->get( 'delivery_method' ) == 'local' ) {

				$local_dir = $this->options->get( 'local_dir' );
				$result = $archive_creator->copy_static_files( $local_dir );

				if ( is_wp_error( $result ) ) {
					$error = $result->get_error_message();
					$this->view->add_flash( 'error', $error );
				} else {
					$message = __( 'Static files copied to: ' . $local_dir, self::SLUG );
					$this->view->add_flash( 'updated', $message );
				}

			} elseif ( $this->options->get( 'delivery_method' ) == 's3' ) {
				$bucket = $this->options->get( 'aws_s3_bucket' );
				$result = $archive_creator->publish_to_s3(
					$bucket,
					$this->options->get( 'aws_access_key_id' ),
					$this->options->get( 'aws_secret_access_key' ),
					$this->options->get( 'aws_s3_region' ),
					$this->options->get( 'aws_s3_endpoint' )
				);
				if ( is_wp_error( $result ) ) {
					$error = $result->get_error_message();
					$this->view->add_flash( 'error', $error );
				} else {
					$message = __( 'Site published to S3 bucket: ' . $bucket, self::SLUG );
					$this->view->add_flash( 'updated', $message );
				}
			}

			if ( $this->options->get( 'delete_temp_files' ) == '1' ) {
				$deleted_successfully = $archive_creator->delete_static_files();
			}

			$export_log = $archive_creator->get_export_log();
			$this->view->assign( 'export_log', $export_log );
		}

		$this->view
			->set_layout( 'admin' )
			->set_template( 'generate' )
			->render();
	}

	/**
	 * Render the options page.
	 *
	 * @return void
	 */
	public function display_options_page() {
		if ( isset( $_POST['save'] ) ) {
			$this->save_options();
			$message = __( 'Settings saved.', self::SLUG );
			$this->view->add_flash( 'updated', $message );
		}

		$this->view
			->set_layout( 'admin' )
			->set_template( 'options' )
			->assign( 'slug', self::SLUG )
			->assign( 'origin_scheme', sist_get_origin_scheme() )
			->assign( 'origin_host', sist_get_origin_host() )
			->assign( 'destination_scheme', $this->options->get( 'destination_scheme' ) )
			->assign( 'destination_host', $this->options->get( 'destination_host' ) )
			->assign( 'temp_files_dir', $this->options->get( 'temp_files_dir' ) )
			->assign( 'additional_urls', $this->options->get( 'additional_urls' ) )
			->assign( 'delivery_method', $this->options->get( 'delivery_method' ) )
			->assign( 'local_dir', $this->options->get( 'local_dir' ) )
			->assign( 'delete_temp_files', $this->options->get( 'delete_temp_files' ) )
			->assign( 'aws_s3_bucket', $this->options->get( 'aws_s3_bucket' ) )
			->assign( 'aws_access_key_id', $this->options->get( 'aws_access_key_id' ) )
			->assign( 'aws_secret_access_key', $this->options->get( 'aws_secret_access_key' ) )
			->assign( 'aws_s3_region', $this->options->get( 'aws_s3_region' ) )
			->assign( 'aws_s3_endpoint', $this->options->get( 'aws_s3_endpoint' ) )
			->render();
	}

	/**
	 * Save the options from the options page.
	 *
	 * @return void
	 */
	public function save_options() {
		$this->options
			->set( 'destination_scheme', filter_input( INPUT_POST, 'destination_scheme' ) )
			->set( 'destination_host', untrailingslashit( filter_input( INPUT_POST, 'destination_host', FILTER_SANITIZE_URL ) ) )
			->set( 'temp_files_dir', sist_trailingslashit_unless_blank( filter_input( INPUT_POST, 'temp_files_dir' ) ) )
			->set( 'additional_urls', filter_input( INPUT_POST, 'additional_urls' ) )
			->set( 'delivery_method', filter_input( INPUT_POST, 'delivery_method' ) )
			->set( 'local_dir', sist_trailingslashit_unless_blank( filter_input( INPUT_POST, 'local_dir' ) ) )
			->set( 'delete_temp_files', filter_input( INPUT_POST, 'delete_temp_files' ) )
			->set( 'aws_s3_bucket', filter_input( INPUT_POST, 'aws_s3_bucket' ) )
			->set( 'aws_access_key_id', filter_input( INPUT_POST, 'aws_access_key_id' ) )
			->set( 'aws_secret_access_key', filter_input( INPUT_POST, 'aws_secret_access_key' ) )
			->set( 'aws_s3_region', filter_input( INPUT_POST, 'aws_s3_region' ) )
			->set( 'aws_s3_endpoint', filter_input( INPUT_POST, 'aws_s3_endpoint' ) )
			->save();
	}

	/**
	 * Loads the plugin language files
	 *
	 * @return void
	 */
	public function load_textdomain() {
		load_plugin_textdomain(
			self::SLUG,
			false,
			dirname( dirname( plugin_basename( __FILE__ ) ) ) . '/languages/'
		);
	}

	/**
	 * Loads the plugin language files
	 *
	 * @return array $errors associative array containing errored field names and an array of error messages
	 */
	public function check_system_requirements() {
		$errors = array();

		$destination_host = $this->options->get( 'destination_host' );
		if ( strlen( $destination_host ) === 0 ) {
			$errors['destination_host'][] = __( 'Destination URL cannot be blank', self::SLUG );
		}

		$temp_files_dir = $this->options->get( 'temp_files_dir' );
		if ( strlen( $temp_files_dir ) === 0 ) {
			$errors['temp_files_dir'][] = __( 'Temporary Files Directory cannot be blank', self::SLUG );
		} else {
			if ( file_exists( $temp_files_dir ) ) {
				if ( ! is_writeable( $temp_files_dir ) ) {
					$errors['delivery_method'][] = sprintf( __( 'Temporary Files Directory is not writeable: %s', self::SLUG ), $temp_files_dir );
				}
			} else {
				$errors['delivery_method'][] = sprintf( __( 'Temporary Files Directory does not exist: %s', self::SLUG ), $temp_files_dir );
			}
		}


		if ( strlen( get_option( 'permalink_structure' ) ) === 0 ) {
			$errors['permalink_structure'][] = sprintf( __( "Your site does not have a permalink structure set. You can select one on <a href='%s'>the Permalink Settings page</a>.", self::SLUG ), admin_url( '/options-permalink.php' ) );
		}

		if ( $this->options->get( 'delivery_method' ) == 's3' ) {
			if ( strlen( $this->options->get( 'aws_s3_bucket' ) ) == 0 ) {
				$errors['delivery_method'][] = __( "You haven't configured an Amazon AWS bucket for S3 publishing.", self::SLUG );
			}
			if ( strlen( $this->options->get( 'aws_access_key_id' ) ) == 0 || strlen( $this->options->get( 'aws_secret_access_key' ) ) == 0 ) {
				$errors['delivery_method'][] = __( "You haven't configured Amazon AWS credentials for S3 publishing.", self::SLUG );
			}
		}

		if ( $this->options->get( 'delivery_method' ) == 'zip' ) {
			if ( ! extension_loaded('zip') ) {
				$errors['delivery_method'][] = __( "Your server does not have the PHP zip extension enabled. Please visit <a href='http://www.php.net/manual/en/book.zip.php'>the PHP zip extension page</a> for more information on how to enable it.", self::SLUG );
			}
		}

		if ( $this->options->get( 'delivery_method' ) == 'local' ) {
			$local_dir = $this->options->get( 'local_dir' );

			if ( strlen( $local_dir ) === 0 ) {
				$errors['delivery_method'][] = __( 'Local Directory cannot be blank', self::SLUG );
			} else {
				if ( file_exists( $local_dir ) ) {
					if ( ! is_writeable( $local_dir ) ) {
						$errors['delivery_method'][] = sprintf( __( 'Local Directory is not writeable: %s', self::SLUG ), $local_dir );
					}
				} else {
					$errors['delivery_method'][] = sprintf( __( 'Local Directory does not exist: %s', self::SLUG ), $local_dir );
				}
			}
		}

		return $errors;
	}
}