<?php
/**
 * Main Plugin class.
 *
 * @package Magdev\WpBnb
 */

declare( strict_types=1 );

namespace Magdev\WpBnb;

use Magdev\WpBnb\License\Manager as LicenseManager;
use Twig\Environment;
use Twig\Loader\FilesystemLoader;

/**
 * Main Plugin singleton class.
 */
final class Plugin {

	/**
	 * Plugin instance.
	 *
	 * @var Plugin|null
	 */
	private static ?Plugin $instance = null;

	/**
	 * Twig environment.
	 *
	 * @var Environment|null
	 */
	private ?Environment $twig = null;

	/**
	 * Get plugin instance.
	 *
	 * @return Plugin
	 */
	public static function get_instance(): Plugin {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Private constructor to enforce singleton.
	 */
	private function __construct() {
		$this->init_hooks();
		$this->init_components();
	}

	/**
	 * Initialize WordPress hooks.
	 *
	 * @return void
	 */
	private function init_hooks(): void {
		// Load text domain.
		add_action( 'init', array( $this, 'load_textdomain' ) );

		// Register assets.
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_admin_assets' ) );
		add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_frontend_assets' ) );

		// Add plugin action links.
		add_filter( 'plugin_action_links_' . WP_BNB_BASENAME, array( $this, 'add_action_links' ) );
	}

	/**
	 * Initialize plugin components.
	 *
	 * @return void
	 */
	private function init_components(): void {
		// Initialize License Manager (always active for admin).
		LicenseManager::get_instance();

		// Initialize admin components.
		if ( is_admin() ) {
			$this->init_admin();
		}

		// Initialize frontend components only if licensed.
		if ( ! is_admin() && LicenseManager::is_license_valid() ) {
			$this->init_frontend();
		}
	}

	/**
	 * Initialize admin components.
	 *
	 * @return void
	 */
	private function init_admin(): void {
		// Admin menu and settings will be added here.
		add_action( 'admin_menu', array( $this, 'register_admin_menu' ) );
		add_action( 'admin_init', array( $this, 'register_settings' ) );
	}

	/**
	 * Initialize frontend components.
	 *
	 * @return void
	 */
	private function init_frontend(): void {
		// Frontend shortcodes, blocks, and widgets will be added here.
	}

	/**
	 * Load plugin text domain.
	 *
	 * @return void
	 */
	public function load_textdomain(): void {
		load_plugin_textdomain(
			'wp-bnb',
			false,
			dirname( WP_BNB_BASENAME ) . '/languages'
		);
	}

	/**
	 * Enqueue admin assets.
	 *
	 * @param string $hook_suffix Current admin page hook.
	 * @return void
	 */
	public function enqueue_admin_assets( string $hook_suffix ): void {
		// Only load on plugin pages.
		if ( strpos( $hook_suffix, 'wp-bnb' ) === false ) {
			return;
		}

		wp_enqueue_style(
			'wp-bnb-admin',
			WP_BNB_URL . 'assets/css/admin.css',
			array(),
			WP_BNB_VERSION
		);

		wp_enqueue_script(
			'wp-bnb-admin',
			WP_BNB_URL . 'assets/js/admin.js',
			array( 'jquery' ),
			WP_BNB_VERSION,
			true
		);

		wp_localize_script(
			'wp-bnb-admin',
			'wpBnbAdmin',
			array(
				'ajaxUrl' => admin_url( 'admin-ajax.php' ),
				'nonce'   => wp_create_nonce( 'wp_bnb_admin_nonce' ),
				'i18n'    => array(
					'validating' => __( 'Validating...', 'wp-bnb' ),
					'activating' => __( 'Activating...', 'wp-bnb' ),
					'error'      => __( 'An error occurred. Please try again.', 'wp-bnb' ),
				),
			)
		);
	}

	/**
	 * Enqueue frontend assets.
	 *
	 * @return void
	 */
	public function enqueue_frontend_assets(): void {
		// Only load if licensed.
		if ( ! LicenseManager::is_license_valid() ) {
			return;
		}

		wp_enqueue_style(
			'wp-bnb-frontend',
			WP_BNB_URL . 'assets/css/frontend.css',
			array(),
			WP_BNB_VERSION
		);

		wp_enqueue_script(
			'wp-bnb-frontend',
			WP_BNB_URL . 'assets/js/frontend.js',
			array(),
			WP_BNB_VERSION,
			true
		);
	}

	/**
	 * Add plugin action links.
	 *
	 * @param array $links Existing plugin links.
	 * @return array
	 */
	public function add_action_links( array $links ): array {
		$plugin_links = array(
			'<a href="' . esc_url( admin_url( 'admin.php?page=wp-bnb-settings' ) ) . '">' . esc_html__( 'Settings', 'wp-bnb' ) . '</a>',
		);
		return array_merge( $plugin_links, $links );
	}

	/**
	 * Register admin menu.
	 *
	 * @return void
	 */
	public function register_admin_menu(): void {
		// Main menu.
		add_menu_page(
			__( 'WP BnB', 'wp-bnb' ),
			__( 'WP BnB', 'wp-bnb' ),
			'manage_options',
			'wp-bnb',
			array( $this, 'render_dashboard_page' ),
			'dashicons-building',
			30
		);

		// Dashboard submenu.
		add_submenu_page(
			'wp-bnb',
			__( 'Dashboard', 'wp-bnb' ),
			__( 'Dashboard', 'wp-bnb' ),
			'manage_options',
			'wp-bnb',
			array( $this, 'render_dashboard_page' )
		);

		// Settings submenu.
		add_submenu_page(
			'wp-bnb',
			__( 'Settings', 'wp-bnb' ),
			__( 'Settings', 'wp-bnb' ),
			'manage_options',
			'wp-bnb-settings',
			array( $this, 'render_settings_page' )
		);
	}

	/**
	 * Register plugin settings.
	 *
	 * @return void
	 */
	public function register_settings(): void {
		// License settings are handled by LicenseManager.
		// Additional settings will be added here.
	}

	/**
	 * Render dashboard page.
	 *
	 * @return void
	 */
	public function render_dashboard_page(): void {
		$license_status = LicenseManager::get_cached_status();
		?>
		<div class="wrap">
			<h1><?php esc_html_e( 'WP BnB Dashboard', 'wp-bnb' ); ?></h1>

			<?php if ( 'valid' !== $license_status ) : ?>
				<div class="notice notice-warning">
					<p>
						<?php
						printf(
							/* translators: %s: Link to settings page */
							esc_html__( 'Your license is not active. Please %s to unlock all features.', 'wp-bnb' ),
							'<a href="' . esc_url( admin_url( 'admin.php?page=wp-bnb-settings&tab=license' ) ) . '">' . esc_html__( 'activate your license', 'wp-bnb' ) . '</a>'
						);
						?>
					</p>
				</div>
			<?php endif; ?>

			<div class="wp-bnb-dashboard">
				<p><?php esc_html_e( 'Welcome to WP BnB Management. Use the menu on the left to manage your buildings, rooms, bookings, and guests.', 'wp-bnb' ); ?></p>
			</div>
		</div>
		<?php
	}

	/**
	 * Render settings page.
	 *
	 * @return void
	 */
	public function render_settings_page(): void {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Tab switching only.
		$active_tab = isset( $_GET['tab'] ) ? sanitize_key( $_GET['tab'] ) : 'general';

		// Handle form submission.
		if ( isset( $_POST['wp_bnb_settings_nonce'] ) && wp_verify_nonce( sanitize_key( $_POST['wp_bnb_settings_nonce'] ), 'wp_bnb_save_settings' ) ) {
			$this->save_settings( $active_tab );
		}
		?>
		<div class="wrap">
			<h1><?php esc_html_e( 'WP BnB Settings', 'wp-bnb' ); ?></h1>

			<nav class="nav-tab-wrapper">
				<a href="<?php echo esc_url( admin_url( 'admin.php?page=wp-bnb-settings&tab=general' ) ); ?>"
				   class="nav-tab <?php echo 'general' === $active_tab ? 'nav-tab-active' : ''; ?>">
					<?php esc_html_e( 'General', 'wp-bnb' ); ?>
				</a>
				<a href="<?php echo esc_url( admin_url( 'admin.php?page=wp-bnb-settings&tab=license' ) ); ?>"
				   class="nav-tab <?php echo 'license' === $active_tab ? 'nav-tab-active' : ''; ?>">
					<?php esc_html_e( 'License', 'wp-bnb' ); ?>
				</a>
			</nav>

			<div class="tab-content">
				<?php
				switch ( $active_tab ) {
					case 'license':
						$this->render_license_settings();
						break;
					default:
						$this->render_general_settings();
						break;
				}
				?>
			</div>
		</div>
		<?php
	}

	/**
	 * Render general settings tab.
	 *
	 * @return void
	 */
	private function render_general_settings(): void {
		?>
		<form method="post" action="">
			<?php wp_nonce_field( 'wp_bnb_save_settings', 'wp_bnb_settings_nonce' ); ?>

			<table class="form-table" role="presentation">
				<tr>
					<th scope="row">
						<label for="wp_bnb_business_name"><?php esc_html_e( 'Business Name', 'wp-bnb' ); ?></label>
					</th>
					<td>
						<input type="text" name="wp_bnb_business_name" id="wp_bnb_business_name"
							   value="<?php echo esc_attr( get_option( 'wp_bnb_business_name', '' ) ); ?>"
							   class="regular-text">
						<p class="description"><?php esc_html_e( 'The name of your B&B business.', 'wp-bnb' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row">
						<label for="wp_bnb_currency"><?php esc_html_e( 'Currency', 'wp-bnb' ); ?></label>
					</th>
					<td>
						<select name="wp_bnb_currency" id="wp_bnb_currency">
							<?php
							$currencies = array(
								'CHF' => __( 'Swiss Franc (CHF)', 'wp-bnb' ),
								'EUR' => __( 'Euro (EUR)', 'wp-bnb' ),
								'USD' => __( 'US Dollar (USD)', 'wp-bnb' ),
								'GBP' => __( 'British Pound (GBP)', 'wp-bnb' ),
							);
							$current    = get_option( 'wp_bnb_currency', 'CHF' );
							foreach ( $currencies as $code => $label ) :
								?>
								<option value="<?php echo esc_attr( $code ); ?>" <?php selected( $current, $code ); ?>>
									<?php echo esc_html( $label ); ?>
								</option>
							<?php endforeach; ?>
						</select>
					</td>
				</tr>
			</table>

			<?php submit_button( __( 'Save Settings', 'wp-bnb' ) ); ?>
		</form>
		<?php
	}

	/**
	 * Render license settings tab.
	 *
	 * @return void
	 */
	private function render_license_settings(): void {
		$license_key    = LicenseManager::get_license_key();
		$server_url     = LicenseManager::get_server_url();
		$license_status = LicenseManager::get_cached_status();
		$license_data   = LicenseManager::get_cached_data();
		$last_check     = LicenseManager::get_last_check();
		?>
		<form method="post" action="">
			<?php wp_nonce_field( 'wp_bnb_save_settings', 'wp_bnb_settings_nonce' ); ?>

			<h2><?php esc_html_e( 'License Status', 'wp-bnb' ); ?></h2>

			<table class="form-table" role="presentation">
				<tr>
					<th scope="row"><?php esc_html_e( 'Status', 'wp-bnb' ); ?></th>
					<td>
						<?php $this->render_license_status_badge( $license_status ); ?>
						<?php if ( $last_check > 0 ) : ?>
							<p class="description">
								<?php
								printf(
									/* translators: %s: Time ago string */
									esc_html__( 'Last checked: %s', 'wp-bnb' ),
									esc_html( human_time_diff( $last_check, time() ) . ' ' . __( 'ago', 'wp-bnb' ) )
								);
								?>
							</p>
						<?php endif; ?>
					</td>
				</tr>
				<?php if ( ! empty( $license_data['expires'] ) ) : ?>
					<tr>
						<th scope="row"><?php esc_html_e( 'Expires', 'wp-bnb' ); ?></th>
						<td>
							<?php echo esc_html( wp_date( get_option( 'date_format' ), strtotime( $license_data['expires'] ) ) ); ?>
						</td>
					</tr>
				<?php endif; ?>
			</table>

			<h2><?php esc_html_e( 'License Configuration', 'wp-bnb' ); ?></h2>

			<table class="form-table" role="presentation">
				<tr>
					<th scope="row">
						<label for="wp_bnb_license_server_url"><?php esc_html_e( 'License Server URL', 'wp-bnb' ); ?></label>
					</th>
					<td>
						<input type="url" name="wp_bnb_license_server_url" id="wp_bnb_license_server_url"
							   value="<?php echo esc_attr( $server_url ); ?>"
							   class="regular-text" placeholder="https://example.com">
						<p class="description"><?php esc_html_e( 'The URL of the license server.', 'wp-bnb' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row">
						<label for="wp_bnb_license_key"><?php esc_html_e( 'License Key', 'wp-bnb' ); ?></label>
					</th>
					<td>
						<input type="text" name="wp_bnb_license_key" id="wp_bnb_license_key"
							   value="<?php echo esc_attr( $license_key ); ?>"
							   class="regular-text" placeholder="XXXX-XXXX-XXXX-XXXX">
						<p class="description"><?php esc_html_e( 'Your license key from the purchase confirmation email.', 'wp-bnb' ); ?></p>
					</td>
				</tr>
				<tr>
					<th scope="row">
						<label for="wp_bnb_license_server_secret"><?php esc_html_e( 'Server Secret', 'wp-bnb' ); ?></label>
					</th>
					<td>
						<input type="password" name="wp_bnb_license_server_secret" id="wp_bnb_license_server_secret"
							   value="" class="regular-text"
							   placeholder="<?php echo ! empty( LicenseManager::get_server_secret() ) ? '••••••••••••••••' : ''; ?>">
						<p class="description"><?php esc_html_e( 'Leave empty to keep the current secret. The shared secret for secure communication.', 'wp-bnb' ); ?></p>
					</td>
				</tr>
			</table>

			<p class="submit">
				<?php submit_button( __( 'Save License Settings', 'wp-bnb' ), 'primary', 'submit', false ); ?>
				<button type="button" id="wp-bnb-validate-license" class="button button-secondary">
					<?php esc_html_e( 'Validate License', 'wp-bnb' ); ?>
				</button>
				<button type="button" id="wp-bnb-activate-license" class="button button-secondary">
					<?php esc_html_e( 'Activate License', 'wp-bnb' ); ?>
				</button>
				<span class="spinner" id="wp-bnb-license-spinner"></span>
			</p>

			<div id="wp-bnb-license-message" style="display: none;"></div>
		</form>
		<?php
	}

	/**
	 * Render license status badge.
	 *
	 * @param string $status License status.
	 * @return void
	 */
	private function render_license_status_badge( string $status ): void {
		$badges = array(
			'valid'        => array(
				'class' => 'dashicons-yes-alt',
				'color' => '#00a32a',
				'label' => __( 'Valid', 'wp-bnb' ),
			),
			'invalid'      => array(
				'class' => 'dashicons-dismiss',
				'color' => '#d63638',
				'label' => __( 'Invalid', 'wp-bnb' ),
			),
			'expired'      => array(
				'class' => 'dashicons-warning',
				'color' => '#dba617',
				'label' => __( 'Expired', 'wp-bnb' ),
			),
			'revoked'      => array(
				'class' => 'dashicons-dismiss',
				'color' => '#d63638',
				'label' => __( 'Revoked', 'wp-bnb' ),
			),
			'inactive'     => array(
				'class' => 'dashicons-marker',
				'color' => '#72aee6',
				'label' => __( 'Inactive', 'wp-bnb' ),
			),
			'unchecked'    => array(
				'class' => 'dashicons-info',
				'color' => '#72aee6',
				'label' => __( 'Not checked', 'wp-bnb' ),
			),
			'unconfigured' => array(
				'class' => 'dashicons-admin-generic',
				'color' => '#646970',
				'label' => __( 'Not configured', 'wp-bnb' ),
			),
		);

		$badge = $badges[ $status ] ?? $badges['unconfigured'];
		?>
		<span class="wp-bnb-license-status" style="color: <?php echo esc_attr( $badge['color'] ); ?>;">
			<span class="dashicons <?php echo esc_attr( $badge['class'] ); ?>"></span>
			<?php echo esc_html( $badge['label'] ); ?>
		</span>
		<?php
	}

	/**
	 * Save settings based on active tab.
	 *
	 * @param string $tab Active tab.
	 * @return void
	 */
	private function save_settings( string $tab ): void {
		switch ( $tab ) {
			case 'license':
				$this->save_license_settings();
				break;
			default:
				$this->save_general_settings();
				break;
		}
	}

	/**
	 * Save general settings.
	 *
	 * @return void
	 */
	private function save_general_settings(): void {
		if ( isset( $_POST['wp_bnb_business_name'] ) ) {
			update_option( 'wp_bnb_business_name', sanitize_text_field( wp_unslash( $_POST['wp_bnb_business_name'] ) ) );
		}
		if ( isset( $_POST['wp_bnb_currency'] ) ) {
			update_option( 'wp_bnb_currency', sanitize_text_field( wp_unslash( $_POST['wp_bnb_currency'] ) ) );
		}

		add_settings_error( 'wp_bnb_settings', 'settings_saved', __( 'Settings saved.', 'wp-bnb' ), 'success' );
		settings_errors( 'wp_bnb_settings' );
	}

	/**
	 * Save license settings.
	 *
	 * @return void
	 */
	private function save_license_settings(): void {
		$data = array(
			'license_key'   => isset( $_POST['wp_bnb_license_key'] ) ? sanitize_text_field( wp_unslash( $_POST['wp_bnb_license_key'] ) ) : '',
			'server_url'    => isset( $_POST['wp_bnb_license_server_url'] ) ? esc_url_raw( wp_unslash( $_POST['wp_bnb_license_server_url'] ) ) : '',
			'server_secret' => isset( $_POST['wp_bnb_license_server_secret'] ) ? sanitize_text_field( wp_unslash( $_POST['wp_bnb_license_server_secret'] ) ) : '',
		);

		LicenseManager::save_settings( $data );

		add_settings_error( 'wp_bnb_settings', 'settings_saved', __( 'License settings saved.', 'wp-bnb' ), 'success' );
		settings_errors( 'wp_bnb_settings' );
	}

	/**
	 * Get Twig environment.
	 *
	 * @return Environment
	 */
	public function get_twig(): Environment {
		if ( null === $this->twig ) {
			$loader     = new FilesystemLoader( WP_BNB_PATH . 'templates' );
			$this->twig = new Environment(
				$loader,
				array(
					'cache' => WP_DEBUG ? false : WP_BNB_PATH . 'cache/twig',
					'debug' => WP_DEBUG,
				)
			);
		}
		return $this->twig;
	}

	/**
	 * Render a Twig template.
	 *
	 * @param string $template Template name.
	 * @param array  $context  Template context.
	 * @return string
	 */
	public function render( string $template, array $context = array() ): string {
		return $this->get_twig()->render( $template, $context );
	}
}