<?php

namespace Carbon_Fields\Container;

use Carbon_Fields\Datastore\Datastore;
use Carbon_Fields\Exception\Incorrect_Syntax_Exception;

/**
 * Theme options container class.
 */
class Theme_Options_Container extends Container {

	/**
	 * Array of registered page slugs to verify uniqueness with
	 *
	 * @var array
	 */
	protected static $registered_pages = array();

	/**
	 * Array of container settings
	 *
	 * @var array
	 */
	public $settings = array(
		'parent' => '',
		'file' => '',
		'icon' => '',
		'menu_position' => null,
		'menu_title' => null,
	);

	/**
	 * {@inheritDoc}
	 */
	public function __construct( $id, $title, $type, $condition_collection, $condition_translator ) {
		parent::__construct( $id, $title, $type, $condition_collection, $condition_translator );

		if ( ! $this->get_datastore() ) {
			$this->set_datastore( Datastore::make( 'theme_options' ), $this->has_default_datastore() );
		}

		if ( apply_filters( 'carbon_fields_' . $type . '_container_admin_only_access', true, $title, $this ) ) {
			$this->where( 'current_user_capability', '=', 'manage_options' );
		}
	}

	/**
	 * Sanitize a title to a filename
	 *
	 * @param  string $title
	 * @param  string $extension
	 * @return string
	 */
	protected function title_to_filename( $title, $extension ) {
		$title = sanitize_file_name( $title );
		$title = strtolower( $title );
		$title = remove_accents( $title );
		$title = preg_replace( array(
			'~\s+~',
			'~[^\w\d-]+~u',
			'~-+~',
		), array(
			'-',
			'-',
			'-',
		), $title );
		return $title . $extension;
	}

	/**
	 * Attach container as a theme options page/subpage.
	 */
	public function init() {
		$registered = $this->register_page();
		if ( $registered ) {
			add_action( 'admin_menu', array( $this, '_attach' ) );
		}
	}

	/**
	 * Checks whether the current save request is valid
	 *
	 * @return bool
	 */
	public function is_valid_save() {
		if ( ! $this->verified_nonce_in_request() ) {
			return false;
		}

		return $this->is_valid_attach_for_object( null );
	}

	/**
	 * Perform save operation after successful is_valid_save() check.
	 * The call is propagated to all fields in the container.
	 *
	 * @param mixed $user_data
	 */
	public function save( $user_data = null ) {
		try {
			parent::save( $user_data );
		} catch ( Incorrect_Syntax_Exception $e ) {
			$this->errors[] = $e->getMessage();
		}

		do_action( 'carbon_fields_' . $this->type . '_container_saved', $user_data, $this );

		if ( ! headers_sent() ) {
			wp_redirect( add_query_arg( array( 'settings-updated' => 'true' ) ) );
		}
	}

	/**
	 * Get environment array for page request (in admin)
	 *
	 * @return array
	 */
	protected function get_environment_for_request() {
		return array();
	}

	/**
	 * Perform checks whether the container should be attached during the current request
	 *
	 * @return bool True if the container is allowed to be attached
	 */
	public function is_valid_attach_for_request() {
		return $this->static_conditions_pass();
	}

	/**
	 * Get environment array for object id
	 *
	 * @return array
	 */
	protected function get_environment_for_object( $object_id ) {
		return array();
	}

	/**
	 * Check container attachment rules against object id
	 *
	 * @param int $object_id
	 * @return bool
	 */
	public function is_valid_attach_for_object( $object_id = null ) {
		return $this->all_conditions_pass( intval( $object_id ) );
	}

	/**
	 * Add theme options container pages.
	 * Hook the container saving action.
	 */
	public function attach() {
		// use the "read" capability because conditions will handle actual access and save capability checking
		// before the attach() method is called

		// Add menu page
		if ( ! $this->settings['parent'] ) {
			add_menu_page(
				$this->title,
				$this->settings['menu_title'] ? $this->settings['menu_title'] : $this->title,
				'read',
				$this->get_page_file(),
				array( $this, 'render' ),
				$this->settings['icon'],
				$this->settings['menu_position']
			);
		}

		add_submenu_page(
			$this->settings['parent'],
			$this->title,
			$this->settings['menu_title'] ? $this->settings['menu_title'] : $this->title,
			'read',
			$this->get_page_file(),
			array( $this, 'render' )
		);

		$page_hook = get_plugin_page_hookname( $this->get_page_file(), '' );
		add_action( 'load-' . $page_hook, array( $this, '_save' ) );
	}

	/**
	 * Whether this container is currently viewed.
	 *
	 * @return boolean
	 */
	public function should_activate() {
		$input = stripslashes_deep( $_GET );
		$request_page = isset( $input['page'] ) ? $input['page'] : '';
		if ( ! empty( $request_page ) && $request_page === $this->get_page_file() ) {
			return true;
		}

		return false;
	}

	/**
	 * Output the container markup
	 */
	public function render() {
		$input = stripslashes_deep( $_GET );
		$request_settings_updated = isset( $input['settings-updated'] ) ? $input['settings-updated'] : '';
		if ( $request_settings_updated === 'true' ) {
			$this->notifications[] = __( 'Settings saved.', 'carbon-fields' );
		}

		include \Carbon_Fields\DIR . '/templates/Container/' . $this->type . '.php';
	}

	/**
	 * Register the page while making sure it is unique.
	 *
	 * @return boolean
	 */
	protected function register_page() {
		$file = $this->get_page_file();
		$parent = $this->settings['parent'];

		if ( ! $parent ) {
			// Register top level page
			if ( isset( static::$registered_pages[ $file ] ) ) {
				Incorrect_Syntax_Exception::raise( 'Page "' . $file . '" already registered' );
				return false;
			}

			static::$registered_pages[ $file ] = array();
			return true;
		}

		// Register sub-page
		if ( ! isset( static::$registered_pages[ $parent ] ) ) {
			static::$registered_pages[ $parent ] = array();
		}

		if ( in_array( $file, static::$registered_pages[ $parent ] ) ) {
			Incorrect_Syntax_Exception::raise( 'Page "' . $file . '" with parent "' . $parent . '" is already registered. Please set a name for the container.' );
			return false;
		}

		static::$registered_pages[ $parent ][] = $file;
		return true;
	}

	/**
	 * Change the parent theme options page of this container
	 *
	 * @param  string|Theme_Options_Container $parent
	 * @return Container                      $this
	 */
	public function set_page_parent( $parent ) {
		if ( is_a( $parent, get_class() ) ) {
			$this->settings['parent'] = $parent->get_page_file();
			return $this;
		}

		$this->settings['parent'] = $parent;
		return $this;
	}

	/**
	 * Get the theme options file name of this container.
	 *
	 * @return string
	 */
	public function get_page_file() {
		if ( ! empty( $this->settings['file'] ) ) {
			return $this->settings['file'];
		}
		return $this->title_to_filename( 'crb_' . $this->get_id(), '.php' );
	}

	/**
	 * Set the theme options file name of this container.
	 *
	 * @param  string    $file
	 * @return Container $this
	 */
	public function set_page_file( $file ) {
		$this->settings['file'] = $file;
		return $this;
	}

	/**
	 * Set the title of this container in the administration menu.
	 *
	 * @param  string    $title
	 * @return Container $this
	 */
	public function set_page_menu_title( $title ) {
		$this->settings['menu_title'] = $title;
		return $this;
	}

	/**
	 * Alias of the set_page_menu_position() method for backwards compatibility
	 *
	 * @param  integer   $position
	 * @return Container $this
	 */
	public function set_page_position( $position ) {
		return $this->set_page_menu_position( $position );
	}

	/**
	 * Set the page position of this container in the administration menu.
	 *
	 * @param  integer   $position
	 * @return Container $this
	 */
	public function set_page_menu_position( $position ) {
		$this->settings['menu_position'] = $position;
		return $this;
	}

	/**
	 * Set the icon of this theme options page.
	 * Applicable only for parent theme option pages.
	 *
	 * @param  string    $icon
	 * @return Container $this
	 */
	public function set_icon( $icon ) {
		$this->settings['icon'] = $icon;
		return $this;
	}
}