<?php
/**
 * ConvertKit Admin Setup Wizard class.
 *
 * @package ConvertKit
 * @author ConvertKit
 */

/**
 * Provides a UI for setting up the ConvertKit Plugin when activated for the
 * first time.
 *
 * If the Plugin has previously been configured (i.e. settings exist in the database),
 * this UI isn't triggered on activation.
 *
 * @package ConvertKit
 * @author ConvertKit
 */
class ConvertKit_Admin_Setup_Wizard_Plugin extends ConvertKit_Admin_Setup_Wizard {

	/**
	 * Holds the ConvertKit Forms resource class.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     bool|ConvertKit_Resource_Forms
	 */
	public $forms = false;

	/**
	 * Holds the ConvertKit API class.
	 *
	 * @since   2.5.0
	 *
	 * @var     bool|ConvertKit_API_V4
	 */
	public $api = false;

	/**
	 * Holds the ConvertKit Settings class.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     bool|ConvertKit_Settings
	 */
	public $settings = false;

	/**
	 * Holds the URL to the most recent WordPress Post, used when previewing a Form below a Post
	 * on the frontend site.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     bool|string
	 */
	public $preview_post_url = false;

	/**
	 * Holds the URL to the most recent WordPress Page, used when previewing a Form below a Page
	 * on the frontend site.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     bool|string
	 */
	public $preview_page_url = false;

	/**
	 * The required user capability to access the setup wizard.
	 *
	 * @since   2.3.2
	 *
	 * @var     string
	 */
	public $required_capability = 'manage_options';

	/**
	 * The programmatic name for this wizard.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     string
	 */
	public $page_name = 'convertkit-setup';

	/**
	 * The URL to take the user to when they click the Exit link.
	 *
	 * @since   1.9.8.4
	 *
	 * @var     string
	 */
	public $exit_url = 'options-general.php?page=_wp_convertkit_settings';

	/**
	 * Holds the form importers.
	 *
	 * @since   3.1.7
	 *
	 * @var     array
	 */
	public $form_importers = array();

	/**
	 * Registers action and filter hooks.
	 *
	 * @since   1.9.8.4
	 */
	public function __construct() {

		// Setup API and settings classes.
		$this->api      = new ConvertKit_API_V4( CONVERTKIT_OAUTH_CLIENT_ID, CONVERTKIT_OAUTH_CLIENT_REDIRECT_URI, false, false, false, 'setup_wizard' );
		$this->settings = new ConvertKit_Settings();

		// Define the steps for the setup wizard.
		add_filter( 'convertkit_admin_setup_wizard_steps_convertkit-setup', array( $this, 'define_steps' ) );

		// Register link to Setup Wizard below Plugin Name at Plugins > Installed Plugins.
		add_filter( 'convertkit_plugin_screen_action_links', array( $this, 'add_setup_wizard_link_on_plugins_screen' ) );

		add_action( 'admin_init', array( $this, 'maybe_redirect_to_setup_screen' ), 9999 );
		add_action( 'convertkit_admin_setup_wizard_process_form_convertkit-setup', array( $this, 'process_form' ) );
		add_action( 'convertkit_admin_setup_wizard_load_screen_data_convertkit-setup', array( $this, 'load_screen_data' ) );

		// Call parent class constructor.
		parent::__construct();

	}

	/**
	 * Define the steps for the setup wizard.
	 *
	 * @since   3.1.8
	 *
	 * @param   array $steps     The steps for the setup wizard.
	 * @return  array
	 */
	public function define_steps( $steps ) {

		$show_form_importer_step = count( convertkit_get_form_importers() ) > 0 ? true : false;

		// Define details for each step in the setup process.
		$steps = array(
			'start'         => array(
				'name'        => __( 'Connect', 'convertkit' ),
				'next_button' => array(
					'label' => __( 'Connect', 'convertkit' ),
					'link'  => $this->api->get_oauth_url( admin_url( 'options.php?page=convertkit-setup&step=configuration' ), get_site_url() ),
				),
			),
			'configuration' => array(
				'name'        => __( 'Configuration', 'convertkit' ),
				'next_button' => array(
					'label' => $show_form_importer_step ? __( 'Next', 'convertkit' ) : __( 'Finish Setup', 'convertkit' ),
				),
			),
		);

		// If the Form Importer step will be displayed, add it to the steps.
		if ( $show_form_importer_step ) {
			$steps['form-importer'] = array(
				'name'        => __( 'Form Importer', 'convertkit' ),
				'next_button' => array(
					'label' => __( 'Finish Setup', 'convertkit' ),
				),
			);
		}

		// Add the finish step.
		$steps['finish'] = array(
			'name' => __( 'Done', 'convertkit' ),
		);

		return $steps;

	}

	/**
	 * Add a link to the Setup Wizard below the Plugin Name on the WP_List_Table at Plugins > Installed Plugins.
	 *
	 * @since   2.1.2
	 *
	 * @param   array $links  HTML Links.
	 * @return  array           HTML Links
	 */
	public function add_setup_wizard_link_on_plugins_screen( $links ) {

		return array_merge(
			$links,
			array(
				'setup_wizard' => sprintf(
					'<a href="%s">%s</a>',
					add_query_arg(
						array(
							'page' => $this->page_name,
						),
						admin_url( 'options.php' )
					),
					__( 'Setup Wizard', 'convertkit' )
				),
			)
		);

	}

	/**
	 * Redirects to the setup screen if a transient was created on Plugin activation,
	 * and the Plugin has no API Key and Secret configured.
	 *
	 * @since   1.9.8.4
	 */
	public function maybe_redirect_to_setup_screen() {

		// If no transient was set by the Plugin's activation routine, don't redirect to the setup screen.
		// This transient will only exist for 30 seconds by design, so we don't hijack a later WordPress
		// Admin screen request.
		if ( ! get_transient( $this->page_name ) ) {
			return;
		}

		// Delete the transient, so we don't redirect again.
		delete_transient( $this->page_name );

		// Bail if the user doesn't have access.
		if ( ! $this->user_has_access() ) {
			return;
		}

		// Check if any settings exist.
		// If they do, the Plugin has already been setup, so no need to show the setup screen.
		$settings = new ConvertKit_Settings();
		if ( $settings->has_access_and_refresh_token() ) {
			return;
		}

		// Show the setup screen.
		wp_safe_redirect( admin_url( 'options.php?page=' . $this->page_name ) );
		exit;

	}

	/**
	 * Process posted data from the submitted form.
	 *
	 * @since   1.9.8.4
	 *
	 * @param   int $step   Current step.
	 */
	public function process_form( $step ) {

		// Depending on the step, process the form data.
		if ( array_key_exists( 'code', $_REQUEST ) || array_key_exists( 'error', $_REQUEST ) || array_key_exists( 'error_description', $_REQUEST ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended - no nonce is sent back from OAuth.
			$this->save_oauth( map_deep( wp_unslash( $_REQUEST ), 'sanitize_text_field' ) ); // phpcs:ignore WordPress.Security.NonceVerification.Recommended - no nonce is sent back from OAuth.
			return;
		}

		// Run security checks.
		if ( ! isset( $_REQUEST['_wpnonce'] ) ) {
			return;
		}
		if ( ! wp_verify_nonce( sanitize_key( $_REQUEST['_wpnonce'] ), $this->page_name ) ) {
			// Decrement the step.
			$this->step  = 'configuration';
			$this->error = __( 'Invalid nonce specified.', 'convertkit' );
			return;
		}

		// Configuration.
		if ( array_key_exists( 'post_form', $_REQUEST ) || array_key_exists( 'page_form', $_REQUEST ) || array_key_exists( 'usage_tracking', $_REQUEST ) ) {
			$settings = new ConvertKit_Settings();
			$settings->save(
				array(
					'post_form'      => isset( $_REQUEST['post_form'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['post_form'] ) ) : '0',
					'page_form'      => isset( $_REQUEST['page_form'] ) ? sanitize_text_field( wp_unslash( $_REQUEST['page_form'] ) ) : '0',
					'usage_tracking' => isset( $_REQUEST['usage_tracking'] ) ? 'on' : '',
				)
			);
			return;
		}

		// Form Importer.
		if ( array_key_exists( 'form_importer', $_REQUEST ) ) {
			// Replace third party form shortcodes and blocks with Kit form shortcodes and blocks.
			foreach ( map_deep( wp_unslash( $_REQUEST['form_importer'] ), 'sanitize_text_field' ) as $form_importer_name => $mappings ) {
				// Sanitize mappings.
				$mappings = array_map( 'sanitize_text_field', wp_unslash( $mappings ) );

				// Replace third party form shortcodes and blocks with Kit form shortcodes and blocks.
				WP_ConvertKit()->get_class( 'admin_importer_' . $form_importer_name )->import( $mappings );
			}

			return;
		}

	}

	/**
	 * Save the OAuth credentials.
	 *
	 * @since   3.1.7
	 *
	 * @param   array $request   Request.
	 * @return  void
	 */
	private function save_oauth( $request ) {

		// If an error occured from OAuth i.e. the user did not authorize, show it now.
		if ( array_key_exists( 'error', $request ) || array_key_exists( 'error_description', $request ) ) {
			// Decrement the step.
			$this->step  = 'start';
			$this->error = sanitize_text_field( wp_unslash( $request['error_description'] ) );
			return;
		}

		// Sanitize token.
		$authorization_code = sanitize_text_field( wp_unslash( $request['code'] ) );

		// Exchange the authorization code and verifier for an access token.
		$result = $this->api->get_access_token( $authorization_code );

		// Show an error message if we could not fetch the access token.
		if ( is_wp_error( $result ) ) {
			// Decrement the step.
			$this->step  = 'start';
			$this->error = $result->get_error_message();
			return;
		}

		// Store Access Token, Refresh Token and expiry.
		$this->settings->save(
			array(
				'access_token'  => $result['access_token'],
				'refresh_token' => $result['refresh_token'],
				'token_expires' => ( time() + $result['expires_in'] ),
			)
		);

	}

	/**
	 * Load any data into class variables for the given setup wizard name and current step.
	 *
	 * @since   1.9.8.4
	 *
	 * @param   int $step   Current step.
	 */
	public function load_screen_data( $step ) {

		// If this wizard is being served in a modal window, change the flow.
		if ( $this->is_modal() ) {
			switch ( $step ) {
				case 'start':
					// Setup API.
					$api = new ConvertKit_API_V4( CONVERTKIT_OAUTH_CLIENT_ID, CONVERTKIT_OAUTH_CLIENT_REDIRECT_URI );

					// Permit wp_safe_redirect to redirect to app.kit.com.
					add_filter(
						'allowed_redirect_hosts',
						function ( $hosts ) {

							return array_merge(
								$hosts,
								array(
									'app.kit.com',
								)
							);

						}
					);

					// Redirect to OAuth.
					wp_safe_redirect( $api->get_oauth_url( admin_url( 'options.php?page=convertkit-setup&step=configuration&convertkit-modal=1' ), get_site_url() ) );
					die();

				case 'configuration':
					// Close modal.
					$this->maybe_close_modal();
					break;
			}
		}

		switch ( $step ) {
			case 'configuration':
				// Re-load settings class now that the Access and Refresh Tokens have been defined.
				$this->settings = new ConvertKit_Settings();

				// Fetch Forms.
				$this->forms = new ConvertKit_Resource_Forms( 'setup_wizard' );
				$result      = $this->forms->refresh();

				// Bail if an error occured.
				if ( is_wp_error( $result ) ) {
					// Change the next button label and make it a link to reload the screen.
					$this->steps['configuration']['next_button']['label'] = __( 'I\'ve created a form in Kit', 'convertkit' );
					$this->steps['configuration']['next_button']['link']  = add_query_arg(
						array(
							'page' => $this->page_name,
							'step' => 'configuration',
						),
						admin_url( 'options.php' )
					);
					return;
				}

				// If no Forms exist in ConvertKit, change the next button label and make it a link to reload
				// the screen.
				if ( ! $this->forms->exist() ) {
					$this->steps['configuration']['next_button']['label'] = __( 'I\'ve created a form in Kit', 'convertkit' );
					$this->steps['configuration']['next_button']['link']  = add_query_arg(
						array(
							'page' => $this->page_name,
							'step' => 'configuration',
						),
						admin_url( 'options.php' )
					);
				}

				// Fetch a Post and a Page, appending the preview nonce to their URLs.
				$this->preview_post_url = WP_ConvertKit()->get_class( 'preview_output' )->get_preview_form_url( 'post' );
				$this->preview_page_url = WP_ConvertKit()->get_class( 'preview_output' )->get_preview_form_url( 'page' );
				break;

			case 'form-importer':
				// Fetch form importers and Kit Forms.
				$this->form_importers = convertkit_get_form_importers();
				$this->forms          = new ConvertKit_Resource_Forms( 'setup_wizard' );
				break;
		}

	}

}