<?php
/**
 * Setup wizard: site language and languages to add, translation method (file or API),
 * API connection, and where the language switcher appears.
 *
 * @package Soft_ML
 */

defined( 'ABSPATH' ) || exit;

class Soft_ML_Wizard {

	const SLUG = 'softml-setup';

	public function __construct() {
		add_action( 'admin_menu', array( $this, 'menu' ), 20 );
		add_action( 'admin_init', array( $this, 'maybe_redirect' ) );
		add_action( 'admin_post_softml_wizard', array( $this, 'handle' ) );
	}

	public function menu() {
		add_submenu_page( Soft_ML_Admin::SLUG, __( 'Softtrix Multilanguage setup', 'softtrix-multilanguage' ), __( 'Setup wizard', 'softtrix-multilanguage' ), Soft_ML_Admin::CAP, self::SLUG, array( $this, 'render' ) );
	}

	/**
	 * Open the wizard right after activation (once).
	 */
	public function maybe_redirect() {
		if ( ! get_transient( 'softml_activation_redirect' ) ) {
			return;
		}
		delete_transient( 'softml_activation_redirect' );
		if ( wp_doing_ajax() || is_network_admin() || ! current_user_can( Soft_ML_Admin::CAP ) || get_option( 'softml_setup_done' ) ) {
			return;
		}
		wp_safe_redirect( self::url( 1 ) );
		exit;
	}

	/**
	 * @param int $step Step number.
	 * @return string
	 */
	public static function url( $step ) {
		return add_query_arg( array( 'page' => self::SLUG, 'step' => (int) $step ), admin_url( 'admin.php' ) );
	}

	/**
	 * @return array step => label
	 */
	private function steps() {
		return array(
			1 => __( 'Languages', 'softtrix-multilanguage' ),
			2 => __( 'Translation method', 'softtrix-multilanguage' ),
			3 => __( 'Connect API', 'softtrix-multilanguage' ),
			4 => __( 'Language switcher', 'softtrix-multilanguage' ),
			5 => __( 'Ready', 'softtrix-multilanguage' ),
		);
	}

	/* ------------------------------------------------------------ save */

	public function handle() {
		if ( ! current_user_can( Soft_ML_Admin::CAP ) ) {
			wp_die( esc_html__( 'You do not have permission to do that.', 'softtrix-multilanguage' ), 403 );
		}
		check_admin_referer( 'softml_wizard' );
		$step     = isset( $_POST['step'] ) ? absint( $_POST['step'] ) : 1;
		$settings = Soft_ML_Settings::all();
		$next     = $step + 1;

		if ( 1 === $step ) {
			$site  = isset( $_POST['site_lang'] ) ? sanitize_key( wp_unslash( $_POST['site_lang'] ) ) : '';
			$codes = isset( $_POST['codes'] ) && is_array( $_POST['codes'] ) ? array_map( 'sanitize_key', wp_unslash( $_POST['codes'] ) ) : array(); // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$old   = Soft_ML_Languages::default_code();
			if ( $site && $site !== $old && 0 === self::linked_count() ) {
				if ( ! Soft_ML_Languages::exists( $site ) ) {
					$lang = Soft_ML_Catalog::get( $site );
					if ( $lang ) {
						$all          = Soft_ML_Languages::all();
						$lang['order'] = -1;
						$all[ $site ]  = $lang;
						Soft_ML_Languages::replace_all( $all );
					}
				}
				if ( Soft_ML_Languages::exists( $site ) ) {
					Soft_ML_Languages::set_default( $site );
					if ( ! in_array( $old, $codes, true ) ) {
						Soft_ML_Languages::delete( $old ); // The previous guess was wrong and nothing uses it yet.
					}
					$settings                     = Soft_ML_Settings::all();
					$settings['seo']['x_default'] = $site;
				}
			}
			// Going back to this step: unticked languages are removed again, unless they already have translations.
			foreach ( array_keys( Soft_ML_Languages::all() ) as $code ) {
				if ( $code !== Soft_ML_Languages::default_code() && ! in_array( $code, $codes, true ) && 0 === Soft_ML_Translations::count_for_language( $code ) ) {
					Soft_ML_Languages::delete( $code );
				}
			}
			$res   = Soft_ML_Languages::add_from_catalog( array_diff( $codes, array( Soft_ML_Languages::default_code() ) ) );
			if ( $res['errors'] ) {
				set_transient( 'softml_notice_' . get_current_user_id(), array( 'error', implode( ' ', $res['errors'] ) ), 60 );
			}
			if ( count( Soft_ML_Languages::all() ) < 2 ) {
				set_transient( 'softml_notice_' . get_current_user_id(), array( 'error', __( 'Choose at least one language to translate your website into.', 'softtrix-multilanguage' ) ), 60 );
				$next = 1;
			}
		} elseif ( 2 === $step ) {
			$settings['general']['method'] = isset( $_POST['method'] ) && 'api' === $_POST['method'] ? 'api' : 'manual';
			$next                          = 'api' === $settings['general']['method'] ? 3 : 4;
		} elseif ( 4 === $step ) {
			$floating = isset( $_POST['floating'] ) ? sanitize_key( wp_unslash( $_POST['floating'] ) ) : 'none';
			$menu     = isset( $_POST['menu_location'] ) ? sanitize_key( wp_unslash( $_POST['menu_location'] ) ) : '';

			$settings['switcher']['floating']      = in_array( $floating, array( 'none', 'bottom-right', 'bottom-left' ), true ) ? $floating : 'none';
			$settings['switcher']['menu_location'] = array_key_exists( $menu, get_registered_nav_menus() ) ? $menu : '';
			update_option( 'softml_setup_done', 1, false );
		}
		Soft_ML_Settings::save( $settings );
		wp_safe_redirect( self::url( $next ) );
		exit;
	}

	/**
	 * @return int Linked translations (the site language can only change before translating).
	 */
	private static function linked_count() {
		global $wpdb;
		return (int) $wpdb->get_var( $wpdb->prepare( 'SELECT COUNT(*) FROM %i', Soft_ML_Translations::table() ) ); // phpcs:ignore WordPress.DB
	}

	/* ------------------------------------------------------------ view */

	public function render() {
		if ( ! current_user_can( Soft_ML_Admin::CAP ) ) {
			wp_die( esc_html__( 'You do not have permission to access this page.', 'softtrix-multilanguage' ), 403 );
		}
		$step  = isset( $_GET['step'] ) ? max( 1, min( 5, absint( $_GET['step'] ) ) ) : 1; // phpcs:ignore WordPress.Security.NonceVerification.Recommended
		$steps = $this->steps();
		$api   = 'api' === Soft_ML_Settings::get( 'general', 'method' );

		echo '<div class="wrap softml-wrap softml-wizard"><h1>' . esc_html__( 'Set up Softtrix Multilanguage', 'softtrix-multilanguage' ) . '</h1><ol class="softml-wizard-nav">';
		foreach ( $steps as $n => $label ) {
			if ( 3 === $n && ! $api ) {
				continue;
			}
			if ( $n < $step && 5 !== $step ) {
				echo '<li class="is-done"><a href="' . esc_url( self::url( $n ) ) . '">' . esc_html( $label ) . '</a></li>';
			} else {
				echo '<li class="' . ( $n === $step ? 'is-current' : ( $n < $step ? 'is-done' : '' ) ) . '">' . esc_html( $label ) . '</li>';
			}
		}
		echo '</ol>';
		call_user_func( array( $this, 'step_' . $step ) );
		echo '</div>';
	}

	private function open( $step ) {
		echo '<form method="post" action="' . esc_url( admin_url( 'admin-post.php' ) ) . '"><input type="hidden" name="action" value="softml_wizard"><input type="hidden" name="step" value="' . esc_attr( $step ) . '">';
		wp_nonce_field( 'softml_wizard' );
	}

	/**
	 * Closes a step form: Back link (when there is a previous step) and the main button.
	 *
	 * @param string $label Main button label.
	 * @param int    $back  Previous step, 0 for none.
	 */
	private function close( $label, $back = 0 ) {
		echo '<p class="softml-wizard-buttons">';
		$this->back( $back );
		submit_button( $label, 'primary large', 'submit', false );
		echo '</p></form>';
	}

	/**
	 * @param int $step Previous step, 0 for none.
	 */
	private function back( $step ) {
		if ( $step ) {
			echo '<a class="button button-large" href="' . esc_url( self::url( $step ) ) . '">&larr; ' . esc_html__( 'Back', 'softtrix-multilanguage' ) . '</a> ';
		}
	}

	/**
	 * Step before the switcher step: the API step only when the API method is chosen.
	 *
	 * @return int
	 */
	private static function before_switcher() {
		return 'api' === Soft_ML_Settings::get( 'general', 'method' ) ? 3 : 2;
	}

	private function step_1() {
		$default = Soft_ML_Languages::default_code();
		$have    = Soft_ML_Languages::all();
		$catalog = Soft_ML_Catalog::all();
		uasort(
			$catalog,
			static function ( $a, $b ) {
				return strcmp( $a['name'], $b['name'] );
			}
		);
		$this->open( 1 );
		echo '<div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'Which language is your website written in now?', 'softtrix-multilanguage' ) . '</h2>';
		if ( self::linked_count() ) {
			$l = Soft_ML_Languages::get( $default );
			echo '<p><strong>' . esc_html( $l ? $l['name'] : $default ) . '</strong> <span class="description">' . esc_html__( '(cannot be changed after translations exist)', 'softtrix-multilanguage' ) . '</span></p>';
		} else {
			echo '<select name="site_lang">';
			$options = $catalog + array_diff_key( $have, $catalog );
			foreach ( $options as $code => $l ) {
				echo '<option value="' . esc_attr( $code ) . '"' . selected( $default, $code, false ) . '>' . esc_html( $l['name'] ) . '</option>';
			}
			echo '</select>';
		}
		echo '</div><div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'Which languages do you want to add?', 'softtrix-multilanguage' ) . '</h2>';
		echo '<p class="description">' . esc_html__( 'Tick one or more. Each language gets its own address, for example example.com/fr/ for French. You can add more later.', 'softtrix-multilanguage' ) . '</p>';
		echo '<p><input type="search" class="regular-text" placeholder="' . esc_attr__( 'Search languages…', 'softtrix-multilanguage' ) . '" data-softml-filter=".softml-lang-item"></p><div class="softml-lang-grid">';
		foreach ( $catalog as $code => $l ) {
			if ( $code === $default ) {
				continue;
			}
			$on     = isset( $have[ $code ] );
			$locked = $on && Soft_ML_Translations::count_for_language( $code ) > 0;
			echo '<label class="softml-lang-item" data-name="' . esc_attr( strtolower( $l['name'] . ' ' . $l['native_name'] . ' ' . $code ) ) . '"><input type="checkbox" name="codes[]" value="' . esc_attr( $code ) . '"' . checked( $on, true, false ) . disabled( $locked, true, false ) . '>' . ( $locked ? '<input type="hidden" name="codes[]" value="' . esc_attr( $code ) . '">' : '' ) . ' ' . esc_html( $l['name'] ) . ( $l['native_name'] !== $l['name'] ? ' <span class="description">(' . esc_html( $l['native_name'] ) . ')</span>' : '' ) . '</label>';
		}
		echo '</div>';
		echo '</div>';
		$this->close( __( 'Save and continue', 'softtrix-multilanguage' ) );
	}

	private function step_2() {
		$this->open( 2 );
		echo '<div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'How do you want to translate?', 'softtrix-multilanguage' ) . '</h2>';
		Soft_ML_Auto_Translate::method_picker( (string) Soft_ML_Settings::get( 'general', 'method' ), '', '' );
		echo '<p class="description">' . esc_html__( 'You can switch at any time, and use both: for example translate automatically, then correct a few texts by hand.', 'softtrix-multilanguage' ) . '</p></div>';
		$this->close( __( 'Continue', 'softtrix-multilanguage' ), 1 );
	}

	private function step_3() {
		echo '<div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'Connect your translation API account', 'softtrix-multilanguage' ) . '</h2>';
		Soft_ML_Auto_Translate::provider_form( self::url( 3 ) );
		echo '</div><p class="softml-wizard-buttons">';
		$this->back( 2 );
		echo '<a class="button button-primary button-large" href="' . esc_url( self::url( 4 ) ) . '">' . esc_html__( 'Continue', 'softtrix-multilanguage' ) . '</a> <span class="description">' . esc_html__( 'Save the key first. You can also connect it later under Softtrix Multilanguage > Translate.', 'softtrix-multilanguage' ) . '</span></p>';
	}

	private function step_4() {
		$floating = (string) Soft_ML_Settings::get( 'switcher', 'floating' );
		$menu     = (string) Soft_ML_Settings::get( 'switcher', 'menu_location' );
		$menus    = get_registered_nav_menus();
		$this->open( 4 );
		echo '<div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'Where should visitors choose their language?', 'softtrix-multilanguage' ) . '</h2>';
		echo '<p><label><strong>' . esc_html__( 'Floating button', 'softtrix-multilanguage' ) . '</strong><br><select name="floating">';
		foreach ( array(
			'bottom-right' => __( 'Bottom right corner', 'softtrix-multilanguage' ),
			'bottom-left'  => __( 'Bottom left corner', 'softtrix-multilanguage' ),
			'none'         => __( 'No floating button', 'softtrix-multilanguage' ),
		) as $k => $v ) {
			echo '<option value="' . esc_attr( $k ) . '"' . selected( 'none' === $floating && ! get_option( 'softml_setup_done' ) ? 'bottom-right' : $floating, $k, false ) . '>' . esc_html( $v ) . '</option>';
		}
		echo '</select></label></p>';
		echo '<p><label><strong>' . esc_html__( 'In a menu', 'softtrix-multilanguage' ) . '</strong><br><select name="menu_location"><option value="">' . esc_html__( '- Not in a menu -', 'softtrix-multilanguage' ) . '</option>';
		foreach ( $menus as $loc => $desc ) {
			echo '<option value="' . esc_attr( $loc ) . '"' . selected( $menu, $loc, false ) . '>' . esc_html( $desc ) . '</option>';
		}
		echo '</select></label>';
		if ( ! $menus ) {
			echo '<br><span class="description">' . esc_html__( 'Your theme has no classic menu locations; use the floating button, the shortcode or the widget.', 'softtrix-multilanguage' ) . '</span>';
		}
		echo '</p><p class="description">' . esc_html__( 'Anywhere else: paste the shortcode [softml_switcher] into a page, widget or builder block, or add the "Language Switcher (Softtrix Multilanguage)" widget.', 'softtrix-multilanguage' ) . '</p></div>';
		$this->close( __( 'Finish setup', 'softtrix-multilanguage' ), self::before_switcher() );
	}

	private function step_5() {
		$api  = 'api' === Soft_ML_Settings::get( 'general', 'method' );
		$base = admin_url( 'admin.php?page=' . Soft_ML_Admin::SLUG );
		echo '<div class="softml-box"><h2 style="margin-top:0">' . esc_html__( 'You are ready to translate', 'softtrix-multilanguage' ) . '</h2><ol>';
		if ( $api ) {
			echo '<li>' . esc_html__( 'Open Translate, tick the pages and languages, and press "Start translating".', 'softtrix-multilanguage' ) . '</li>';
		} else {
			echo '<li>' . esc_html__( 'Open Translate and press "Prepare selected pages".', 'softtrix-multilanguage' ) . '</li>';
			echo '<li>' . esc_html__( 'Download the text file, translate it, and upload it again.', 'softtrix-multilanguage' ) . '</li>';
		}
		echo '<li>' . esc_html__( 'Review the drafts, approve them and publish the translated pages.', 'softtrix-multilanguage' ) . '</li></ol>';
		if ( ! get_option( 'permalink_structure' ) ) {
			echo '<div class="notice notice-warning inline"><p>' . esc_html__( 'Language addresses like /fr/ need "pretty" permalinks. Choose any option except "Plain" under Settings > Permalinks.', 'softtrix-multilanguage' ) . ' <a href="' . esc_url( admin_url( 'options-permalink.php' ) ) . '">' . esc_html__( 'Open Permalinks', 'softtrix-multilanguage' ) . '</a></p></div>';
		}
		echo '<p class="softml-wizard-buttons">';
		$this->back( 4 );
		echo '<a class="button button-primary button-large" href="' . esc_url( $base . '&tab=auto' ) . '">' . esc_html__( 'Start translating', 'softtrix-multilanguage' ) . '</a> <a class="button button-large" href="' . esc_url( $base ) . '">' . esc_html__( 'Go to the dashboard', 'softtrix-multilanguage' ) . '</a></p></div>';
	}
}