<?php
/**
 * Admin Page - registers menus, renders dashboard and settings.
 *
 * @package Asmith_Speed_Optimizer
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class Asmith_SO_Admin_Page {

	private static $instance = null;

	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	private function __construct() {
		add_action( 'admin_menu', array( $this, 'register_menus' ) );
		add_action( 'wp_dashboard_setup', array( $this, 'register_dashboard_widget' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_dashboard_widget_css' ) );
		add_action( 'wp_ajax_asmith_so_dismiss_notice', array( $this, 'ajax_dismiss_notice' ) );
		add_action( 'wp_ajax_asmith_so_clear_cache', array( $this, 'ajax_clear_cache' ) );
		add_action( 'wp_ajax_asmith_so_test_email', array( $this, 'ajax_test_email' ) );
		add_action( 'wp_ajax_asmith_so_toggle_option', array( $this, 'ajax_toggle_option' ) );
		add_action( 'admin_init', array( $this, 'register_settings' ) );
	}

	/**
	 * Enqueue the dashboard widget CSS only on the WP admin dashboard page.
	 *
	 * @param string $hook_suffix Current admin page hook.
	 */
	public function enqueue_dashboard_widget_css( $hook_suffix ) {
		if ( 'index.php' !== $hook_suffix ) {
			return;
		}
		wp_enqueue_style(
			'asmith-so-dashboard-widget',
			ASMITH_SO_PLUGIN_URL . 'assets/css/dashboard-widget.css',
			array(),
			ASMITH_SO_VERSION
		);
	}

	/**
	 * Register admin menu pages.
	 */
	public function register_menus() {
		add_menu_page(
			__( 'Speed Optimizer', 'a-smith-speed-optimizer' ),
			__( 'Speed Optimizer', 'a-smith-speed-optimizer' ),
			'manage_options',
			'asmith-so',
			array( $this, 'render_dashboard' ),
			'dashicons-performance',
			66
		);

		add_submenu_page(
			'asmith-so',
			__( 'Dashboard', 'a-smith-speed-optimizer' ),
			__( 'Dashboard', 'a-smith-speed-optimizer' ),
			'manage_options',
			'asmith-so',
			array( $this, 'render_dashboard' )
		);

		add_submenu_page(
			'asmith-so',
			__( 'Settings', 'a-smith-speed-optimizer' ),
			__( 'Settings', 'a-smith-speed-optimizer' ),
			'manage_options',
			'asmith-so-settings',
			array( $this, 'render_settings' )
		);
	}

	/**
	 * Register settings.
	 */
	public function register_settings() {
		// Optimization toggles.
		register_setting( 'asmith_so_settings', 'asmith_so_lazy_load', array(
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'default'           => true,
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_lazy_load_exclusions', array(
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_textarea_field',
			'default'           => '',
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_minify_html', array(
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'default'           => false,
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_defer_js', array(
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'default'           => false,
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_defer_js_exclusions', array(
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_text_field',
			'default'           => '',
		) );

		// Bloat removal toggles.
		$bloat_options = array(
			'asmith_so_remove_emoji'          => true,
			'asmith_so_remove_embeds'         => true,
			'asmith_so_remove_query_strings'  => true,
			'asmith_so_remove_dashicons'      => true,
			'asmith_so_remove_xmlrpc'         => true,
			'asmith_so_remove_rest_links'     => true,
			'asmith_so_remove_shortlinks'     => true,
			'asmith_so_remove_wlw'            => true,
			'asmith_so_remove_rsd'            => true,
			'asmith_so_remove_rss'            => false,
		);

		foreach ( $bloat_options as $option => $default ) {
			register_setting( 'asmith_so_settings', $option, array(
				'type'              => 'boolean',
				'sanitize_callback' => 'rest_sanitize_boolean',
				'default'           => $default,
			) );
		}

		// Email settings.
		register_setting( 'asmith_so_settings', 'asmith_so_email_frequency', array(
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_text_field',
			'default'           => 'weekly',
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_email_recipients', array(
			'type'              => 'string',
			'sanitize_callback' => 'sanitize_email',
			'default'           => get_option( 'admin_email' ),
		) );

		register_setting( 'asmith_so_settings', 'asmith_so_auto_scan', array(
			'type'              => 'boolean',
			'sanitize_callback' => 'rest_sanitize_boolean',
			'default'           => true,
		) );
	}

	/**
	 * Render the main dashboard page.
	 */
	public function render_dashboard() {
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Unauthorized access.', 'a-smith-speed-optimizer' ) );
		}

		$asmith_so_last_scan = get_option( 'asmith_so_last_scan' );

		// First run -- show animated scanning experience.
		if ( empty( $asmith_so_last_scan ) ) {
			include ASMITH_SO_PLUGIN_DIR . 'templates/first-scan.php';
			return;
		}

		$asmith_so_report = Asmith_SO_Performance_Score::instance()->get_score();
		if ( empty( $asmith_so_report ) ) {
			$asmith_so_report = Asmith_SO_Performance_Score::instance()->calculate_score();
		}

		include ASMITH_SO_PLUGIN_DIR . 'templates/dashboard.php';
	}

	/**
	 * Render the settings page.
	 */
	public function render_settings() {
		if ( ! current_user_can( 'manage_options' ) ) {
			wp_die( esc_html__( 'Unauthorized access.', 'a-smith-speed-optimizer' ) );
		}

		include ASMITH_SO_PLUGIN_DIR . 'templates/settings.php';
	}

	/**
	 * Register the WP Dashboard widget.
	 */
	public function register_dashboard_widget() {
		wp_add_dashboard_widget(
			'asmith_so_speed_widget',
			__( 'A. Smith Speed Optimizer', 'a-smith-speed-optimizer' ),
			array( $this, 'render_dashboard_widget' )
		);

		// Move our widget to the top.
		global $wp_meta_boxes;
		if ( isset( $wp_meta_boxes['dashboard']['normal']['core']['asmith_so_speed_widget'] ) ) {
			$dashboard = $wp_meta_boxes['dashboard']['normal']['core'];
			$widget    = array( 'asmith_so_speed_widget' => $dashboard['asmith_so_speed_widget'] );
			unset( $dashboard['asmith_so_speed_widget'] );
			$wp_meta_boxes['dashboard']['normal']['core'] = array_merge( $widget, $dashboard );
		}
	}

	/**
	 * Render the WP Dashboard widget content.
	 */
	public function render_dashboard_widget() {
		$asmith_so_last_scan = get_option( 'asmith_so_last_scan' );
		$asmith_so_is_pro    = Asmith_SO_Pro_Bridge::is_pro_active();

		if ( empty( $asmith_so_last_scan ) ) {
			?>
			<div style="text-align:center;padding:16px 0;">
				<p style="color:#666;margin:0 0 12px;">
					<?php esc_html_e( 'No scan data yet. Run your first performance scan.', 'a-smith-speed-optimizer' ); ?>
				</p>
				<a href="<?php echo esc_url( admin_url( 'admin.php?page=asmith-so' ) ); ?>" class="button button-primary">
					<?php esc_html_e( 'Scan Now', 'a-smith-speed-optimizer' ); ?>
				</a>
			</div>
			<?php
			return;
		}

		$asmith_so_report = Asmith_SO_Performance_Score::instance()->get_score();
		if ( empty( $asmith_so_report ) ) {
			return;
		}

		$asmith_so_score = (int) $asmith_so_report['score'];
		$asmith_so_grade = $asmith_so_report['grade'];

		$asmith_so_grade_colors = array(
			'A' => '#22c55e', 'B' => '#84cc16', 'C' => '#eab308',
			'D' => '#f97316', 'F' => '#ef4444',
		);
		$asmith_so_color = $asmith_so_grade_colors[ $asmith_so_grade ] ?? '#64748b';
		?>
		<div class="asmith-so-widget">
			<div class="asmith-so-widget-top">
				<div class="asmith-so-widget-score" style="background:<?php echo esc_attr( $asmith_so_color ); ?>;">
					<span class="asmith-so-widget-score-num"><?php echo esc_html( $asmith_so_score ); ?></span>
					<span class="asmith-so-widget-score-grade"><?php echo esc_html( $asmith_so_grade ); ?></span>
				</div>
				<div class="asmith-so-widget-info">
					<h3><?php esc_html_e( 'Speed Score', 'a-smith-speed-optimizer' ); ?></h3>
					<div class="asmith-so-widget-stats">
						<span><?php echo esc_html( $asmith_so_report['details']['active_optimizations'] ); ?> <?php esc_html_e( 'optimizations', 'a-smith-speed-optimizer' ); ?></span>
						<span><?php echo esc_html( $asmith_so_report['details']['bloat_items_removed'] ); ?> <?php esc_html_e( 'bloat removed', 'a-smith-speed-optimizer' ); ?></span>
					</div>
				</div>
			</div>

			<?php if ( ! $asmith_so_is_pro ) : ?>
				<div class="asmith-so-widget-pro">
					<span class="asmith-so-widget-pro-badge">PRO</span>
					<span><?php esc_html_e( 'Critical CSS, WebP & more', 'a-smith-speed-optimizer' ); ?></span>
					<a href="https://asmith.media/speed-optimizer/" target="_blank" rel="noopener">
						<?php esc_html_e( 'Upgrade', 'a-smith-speed-optimizer' ); ?> &rarr;
					</a>
				</div>
			<?php endif; ?>

			<div class="asmith-so-widget-footer">
				<a href="<?php echo esc_url( admin_url( 'admin.php?page=asmith-so' ) ); ?>">
					<?php esc_html_e( 'View Dashboard', 'a-smith-speed-optimizer' ); ?> &rarr;
				</a>
				<span class="asmith-so-widget-time">
					<?php
					printf(
						/* translators: %s: human-readable time difference */
						esc_html__( 'Scanned %s ago', 'a-smith-speed-optimizer' ),
						esc_html( human_time_diff( $asmith_so_last_scan, current_time( 'timestamp' ) ) )
					);
					?>
				</span>
			</div>
		</div>
		<?php
	}

	/**
	 * AJAX: Toggle an optimization option from the dashboard.
	 */
	public function ajax_toggle_option() {
		check_ajax_referer( 'asmith_so_nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error();
		}

		$asmith_so_option_name  = isset( $_POST['option_name'] ) ? sanitize_text_field( wp_unslash( $_POST['option_name'] ) ) : '';
		$asmith_so_option_value = isset( $_POST['option_value'] ) ? absint( $_POST['option_value'] ) : 0;

		// Only allow toggling our own options.
		$asmith_so_allowed = array(
			'asmith_so_lazy_load',
			'asmith_so_minify_html',
			'asmith_so_defer_js',
			'asmith_so_remove_emoji',
			'asmith_so_remove_embeds',
			'asmith_so_remove_query_strings',
			'asmith_so_remove_dashicons',
			'asmith_so_remove_xmlrpc',
			'asmith_so_remove_rest_links',
			'asmith_so_remove_shortlinks',
			'asmith_so_remove_wlw',
			'asmith_so_remove_rsd',
			'asmith_so_remove_rss',
		);

		if ( ! in_array( $asmith_so_option_name, $asmith_so_allowed, true ) ) {
			wp_send_json_error( __( 'Invalid option.', 'a-smith-speed-optimizer' ) );
		}

		update_option( $asmith_so_option_name, (bool) $asmith_so_option_value );

		// Clear the score transient so it recalculates.
		delete_transient( 'asmith_so_score' );

		wp_send_json_success( array(
			'option' => $asmith_so_option_name,
			'value'  => (bool) $asmith_so_option_value,
		) );
	}

	/**
	 * AJAX: Dismiss an admin notice.
	 */
	public function ajax_dismiss_notice() {
		check_ajax_referer( 'asmith_so_nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error();
		}

		$asmith_so_notice_id = isset( $_POST['notice_id'] ) ? sanitize_text_field( wp_unslash( $_POST['notice_id'] ) ) : '';
		if ( $asmith_so_notice_id ) {
			update_user_meta( get_current_user_id(), 'asmith_so_dismissed_' . $asmith_so_notice_id, true );
		}

		wp_send_json_success();
	}

	/**
	 * AJAX: Clear all cached scan data.
	 */
	public function ajax_clear_cache() {
		check_ajax_referer( 'asmith_so_nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error();
		}

		delete_transient( 'asmith_so_score' );
		delete_transient( 'asmith_so_asset_counts' );
		delete_option( 'asmith_so_last_scan' );

		wp_send_json_success( __( 'Cache cleared. A fresh scan will run on the next dashboard visit.', 'a-smith-speed-optimizer' ) );
	}

	/**
	 * AJAX: Send a test email report.
	 */
	public function ajax_test_email() {
		check_ajax_referer( 'asmith_so_nonce', 'nonce' );

		if ( ! current_user_can( 'manage_options' ) ) {
			wp_send_json_error();
		}

		$asmith_so_recipient = get_option( 'asmith_so_email_recipients', get_option( 'admin_email' ) );
		$asmith_so_report    = Asmith_SO_Performance_Score::instance()->get_score();

		if ( empty( $asmith_so_report ) ) {
			$asmith_so_report = Asmith_SO_Performance_Score::instance()->calculate_score();
		}

		ob_start();
		$report = $asmith_so_report;
		include ASMITH_SO_PLUGIN_DIR . 'templates/email-report.php';
		$asmith_so_html = ob_get_clean();

		$asmith_so_subject = sprintf(
			/* translators: %s: site name */
			__( '[Speed Optimizer] Speed Report for %s', 'a-smith-speed-optimizer' ),
			get_bloginfo( 'name' )
		);

		$asmith_so_headers = array( 'Content-Type: text/html; charset=UTF-8' );

		$asmith_so_sent = wp_mail( $asmith_so_recipient, $asmith_so_subject, $asmith_so_html, $asmith_so_headers );

		if ( $asmith_so_sent ) {
			wp_send_json_success( __( 'Test email sent successfully!', 'a-smith-speed-optimizer' ) );
		} else {
			wp_send_json_error( __( 'Failed to send test email. Check your mail configuration.', 'a-smith-speed-optimizer' ) );
		}
	}
}