<?php
defined( 'ABSPATH' ) || exit;

/**
 * Native WordPress Dashboard ("Dashboard" -> "Home" screen) widget - a
 * compact SEO snapshot so admins see traffic + health at a glance without
 * opening the AWBSEO menu. Reuses AWBSEO_Admin::get_dashboard_data() so the
 * numbers here always match the full AWBSEO Dashboard page exactly - one
 * source of truth, no separate query path to drift out of sync.
 *
 * Widget CSS is enqueued via admin-inline.css (loaded on all admin pages).
 */
class AWBSEO_Dashboard_Widget {

	public static function init() {
		add_action( 'wp_dashboard_setup',    [ __CLASS__, 'add_widget' ] );
		// Run at priority 999 so all other widgets are registered first,
		// then move ours to the top of the $wp_meta_boxes array.
		add_action( 'wp_dashboard_setup',    [ __CLASS__, 'move_to_top' ], 999 );
		// Also reorder any saved user positions so returning users see it first too.
		add_filter( 'get_user_option_meta-box-order_dashboard', [ __CLASS__, 'force_top_position' ] );
		add_action( 'admin_enqueue_scripts', [ __CLASS__, 'enqueue_styles' ] );
	}

	public static function enqueue_styles( $hook ) {
		if ( 'index.php' !== $hook ) {
			return;
		}
		wp_register_style( 'awbseo-dashboard-widget', false, [], AWBSEO_VERSION );
		wp_enqueue_style( 'awbseo-dashboard-widget' );
		wp_add_inline_style( 'awbseo-dashboard-widget',
			'.awb-dw-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px}' .
			'.awb-dw-stat{background:#f6f7f7;border-radius:6px;padding:11px 14px}' .
			'.awb-dw-stat__label{font-size:11px;color:#646970;text-transform:uppercase;letter-spacing:.04em;margin-bottom:3px}' .
			'.awb-dw-stat__value{font-size:22px;font-weight:700;line-height:1.2;color:#1d2327;margin-bottom:2px}' .
			'.awb-dw-change{font-size:11px;font-weight:600;display:block}' .
			'.awb-dw-source-badge{font-size:11px;color:#646970;margin-bottom:10px;padding:5px 8px;background:#f6f7f7;border-radius:4px;display:inline-block}' .
			'.awb-dw-health{display:flex;align-items:center;justify-content:space-between;padding:11px 0 0;border-top:1px solid #f0f0f1;font-size:13px;cursor:pointer;user-select:none}' .
			'.awb-dw-health-toggle{font-size:11px;color:#646970;margin-left:6px}' .
			'.awb-dw-issues{margin:6px 0 4px;display:none}' .
			'.awb-dw-issues.open{display:block}' .
			'.awb-dw-issue-row{display:flex;align-items:center;justify-content:space-between;padding:6px 0;border-bottom:1px solid #f0f0f1;font-size:12px;color:#3c434a}' .
			'.awb-dw-issue-row:last-child{border-bottom:none}' .
			'.awb-dw-issue-count{font-weight:700;min-width:24px;text-align:right;margin-right:8px}' .
			'.awb-dw-issue-fix{font-size:11px;color:#135e96;white-space:nowrap;text-decoration:none;font-weight:500}' .
			'.awb-dw-issue-fix:hover{text-decoration:underline}' .
			'.awb-dw-footer{margin:10px 0 2px;text-align:right;font-size:12px}' .
			'.awb-dw-footer a{color:#135e96;text-decoration:none}' .
			'.awb-dw-footer a:hover{text-decoration:underline}' .
			'.awb-dw-connect{padding:6px 0 10px;font-size:13px;color:#50575e}' .
			'.awb-dw-connect p{margin:0 0 8px}' .
			'.awb-dw-notice{background:#fff8e5;border-left:3px solid #dba617;border-radius:3px;padding:8px 10px;font-size:12px;color:#4a4a4a;margin-bottom:12px;line-height:1.5}' .
			'.awb-dw-notice a{color:#135e96}'
		);
	}

	public static function add_widget() {
		wp_add_dashboard_widget(
			'awbseo_dashboard_widget',
			'CitedSEO',
			[ __CLASS__, 'render_widget' ]
		);
	}

	/**
	 * Reorder the global $wp_meta_boxes array so our widget is first in the
	 * 'normal' column at 'high' priority. This affects users who haven't saved
	 * a custom widget layout yet.
	 */
	public static function move_to_top() {
		global $wp_meta_boxes;

		$widget_id = 'awbseo_dashboard_widget';
		$widget    = null;

		// Find and remove from wherever WordPress placed it.
		foreach ( [ 'normal', 'side', 'column3', 'column4' ] as $col ) {
			foreach ( [ 'high', 'core', 'default', 'low' ] as $prio ) {
				if ( isset( $wp_meta_boxes['dashboard'][ $col ][ $prio ][ $widget_id ] ) ) {
					$widget = $wp_meta_boxes['dashboard'][ $col ][ $prio ][ $widget_id ];
					unset( $wp_meta_boxes['dashboard'][ $col ][ $prio ][ $widget_id ] );
				}
			}
		}

		if ( ! $widget ) {
			return;
		}

		// Prepend to normal/high so it appears above everything else.
		$existing = $wp_meta_boxes['dashboard']['normal']['high'] ?? [];
		$wp_meta_boxes['dashboard']['normal']['high'] = array_merge(
			[ $widget_id => $widget ],
			$existing
		);
	}

	/**
	 * For users who already have a saved dashboard widget order, inject our
	 * widget at the top of the normal column so it's always first.
	 *
	 * @param  array|false $order Saved meta-box order from user_meta.
	 * @return array|false
	 */
	public static function force_top_position( $order ) {
		if ( empty( $order ) || ! is_array( $order ) ) {
			return $order;
		}

		$widget_id = 'awbseo_dashboard_widget';

		// Strip it from every column so we don't get duplicates.
		foreach ( $order as $col => $ids_str ) {
			$ids          = array_filter( explode( ',', $ids_str ) );
			$ids          = array_values( array_diff( $ids, [ $widget_id ] ) );
			$order[ $col ] = implode( ',', $ids );
		}

		// Prepend to the normal column.
		$normal_ids = array_filter( explode( ',', $order['normal'] ?? '' ) );
		array_unshift( $normal_ids, $widget_id );
		$order['normal'] = implode( ',', $normal_ids );

		return $order;
	}

	public static function render_widget() {
		global $wpdb;

		// ── Traffic data (reuse admin data layer) ──────────────────────────
		$data        = AWBSEO_Admin::get_dashboard_data( 28 );
		$gsc_on      = $data['gsc_on'];
		$bing_on     = $data['bing_on'];
		$gsc_summary = $data['gsc_summary'];
		$bing_summary = $data['bing_summary'];
		$gsc_last_error = $data['gsc_last_error'] ?? null;

		// Determine which source to display and whether we have a permission error.
		$gsc_permission_error = $gsc_on && ! $gsc_summary;
		if ( $gsc_summary ) {
			$summary = $gsc_summary;
			$source  = 'GSC';
		} elseif ( $bing_summary ) {
			$summary = $bing_summary;
			$source  = 'Bing';
		} else {
			$summary = null;
			$source  = null;
		}

		// ── Site health counts ─────────────────────────────────────────────
		// Scoped to post + page (not just 'post') so this count matches what
		// clicking "Fix →" below actually shows - both are what a normal
		// site owner means by "my pages," and the Bulk Editor's own "All
		// Posts & Pages" filter draws from the same two post types.
		$no_kw_count    = (int) $wpdb->get_var( "SELECT COUNT(DISTINCT p.ID) FROM {$wpdb->posts} p LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID AND pm.meta_key = '_awb_seo_focus_keyword' WHERE p.post_type IN ('post','page') AND p.post_status = 'publish' AND (pm.meta_value IS NULL OR pm.meta_value = '')" );
		$no_desc_count  = (int) $wpdb->get_var( "SELECT COUNT(DISTINCT p.ID) FROM {$wpdb->posts} p LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID AND pm.meta_key = '_awb_seo_description' WHERE p.post_type IN ('post','page') AND p.post_status = 'publish' AND (pm.meta_value IS NULL OR pm.meta_value = '')" );
		$no_title_count = (int) $wpdb->get_var( "SELECT COUNT(DISTINCT p.ID) FROM {$wpdb->posts} p LEFT JOIN {$wpdb->postmeta} pm ON pm.post_id = p.ID AND pm.meta_key = '_awb_seo_title' WHERE p.post_type IN ('post','page') AND p.post_status = 'publish' AND (pm.meta_value IS NULL OR pm.meta_value = '')" );
		// Only a real 404 or a failed connection counts as "broken" - see
		// AWBSEO_Broken_Links::is_broken_code() for why 401/403/429/etc are
		// excluded (bot/rate-limit blocks that aren't actually broken links).
		$broken_sql     = AWBSEO_Broken_Links::broken_sql();
		$broken_count   = (int) $wpdb->get_var( "SELECT COUNT(*) FROM {$wpdb->prefix}awb_broken_links WHERE {$broken_sql} AND fix_status != 'fixed'" );
		$issues         = $no_kw_count + $no_desc_count + $no_title_count + $broken_count;

		$issue_rows = [];
		if ( $broken_count ) {
			$issue_rows[] = [
				'label' => 'Broken links',
				'count' => $broken_count,
				'url'   => admin_url( 'admin.php?page=awbseo-broken-links' ),
			];
		}
		if ( $no_title_count ) {
			$issue_rows[] = [
				'label' => 'Missing SEO title',
				'count' => $no_title_count,
				'url'   => admin_url( 'admin.php?page=awbseo-bulk&awb_filter=missing_title' ),
			];
		}
		if ( $no_desc_count ) {
			$issue_rows[] = [
				'label' => 'Missing meta description',
				'count' => $no_desc_count,
				'url'   => admin_url( 'admin.php?page=awbseo-bulk&awb_filter=missing_description' ),
			];
		}
		if ( $no_kw_count ) {
			$issue_rows[] = [
				'label' => 'Missing focus keyword',
				'count' => $no_kw_count,
				'url'   => admin_url( 'admin.php?page=awbseo-bulk&awb_filter=missing_keyword' ),
			];
		}

		$settings_url  = admin_url( 'admin.php?page=awbseo-settings' );
		$dashboard_url = admin_url( 'admin.php?page=awbseo' );
		?>
		<?php if ( $gsc_permission_error ) : ?>
			<div class="awb-dw-notice">
				⚠ GSC connected but your Google account doesn't have access to this property.
				Ask the site owner to add you as a <strong>Full User</strong> in
				<a href="https://search.google.com/search-console" target="_blank" rel="noopener">Search Console</a>.
			</div>
		<?php endif; ?>

		<?php
		// ── Change chip helper ─────────────────────────────────────────────
		// $invert = true means lower is better (position).
		$change_chip = function( $pct, $invert = false ) {
			if ( $pct === null ) return '';
			$positive = $invert ? $pct < 0 : $pct > 0;
			$color    = $positive ? '#00a32a' : ( $pct == 0 ? '#646970' : '#b32d2e' );
			$arrow    = $pct > 0 ? '▲' : ( $pct < 0 ? '▼' : '' );
			$abs      = abs( $pct );
			return '<span class="awb-dw-change" style="color:' . $color . '">' . $arrow . ' ' . $abs . '%</span>';
		};
		?>
		<?php if ( $summary ) : ?>
			<?php if ( 'Bing' === $source ) : ?>
				<div class="awb-dw-source-badge">📊 Showing Bing Webmaster Tools data (GSC unavailable)</div>
			<?php endif; ?>
			<div class="awb-dw-grid">
				<div class="awb-dw-stat">
					<div class="awb-dw-stat__label">Clicks (28d)</div>
					<div class="awb-dw-stat__value"><?php echo number_format_i18n( (int) ( $summary['clicks'] ?? 0 ) ); ?></div>
					<?php echo $change_chip( $summary['clicks_change'] ?? null ); ?>
				</div>
				<div class="awb-dw-stat">
					<div class="awb-dw-stat__label">Impressions (28d)</div>
					<div class="awb-dw-stat__value"><?php echo number_format_i18n( (int) ( $summary['impressions'] ?? 0 ) ); ?></div>
					<?php echo $change_chip( $summary['impr_change'] ?? null ); ?>
				</div>
				<div class="awb-dw-stat">
					<div class="awb-dw-stat__label">Avg. CTR</div>
					<div class="awb-dw-stat__value"><?php echo esc_html( $summary['ctr'] ?? 0 ); ?>%</div>
					<?php echo $change_chip( $summary['ctr_change'] ?? null ); ?>
				</div>
				<div class="awb-dw-stat">
					<div class="awb-dw-stat__label">Avg. Position</div>
					<?php $pos = $summary['position'] ?? 0; ?>
					<div class="awb-dw-stat__value"><?php echo $pos > 0 ? esc_html( $pos ) : 'N/A'; ?></div>
					<?php echo $pos > 0 ? $change_chip( $summary['position_change'] ?? null, true ) : ''; ?>
				</div>
			</div>
		<?php else : ?>
			<div class="awb-dw-connect">
				<p>Connect Google Search Console or Bing Webmaster Tools to see clicks, impressions, and rankings right here.</p>
				<p><a href="<?php echo esc_url( $settings_url ); ?>" class="button button-small">Connect now →</a></p>
			</div>
		<?php endif; ?>

		<div class="awb-dw-health" id="awb-dw-health-toggle" onclick="
			var el = document.getElementById('awb-dw-issues');
			if(el){ el.classList.toggle('open'); }
			var t = document.getElementById('awb-dw-toggle-icon');
			if(t){ t.textContent = el && el.classList.contains('open') ? '▲' : '▼'; }
		">
			<span>SEO health</span>
			<span style="display:flex;align-items:center;gap:6px">
				<strong style="color:<?php echo $issues ? '#b32d2e' : '#00a32a'; ?>">
					<?php
					echo $issues
						? esc_html( $issues ) . ' issue' . ( 1 === $issues ? '' : 's' )
						: 'All clear ✓';
					?>
				</strong>
				<?php if ( $issue_rows ) : ?>
					<span class="awb-dw-health-toggle" id="awb-dw-toggle-icon">▼</span>
				<?php endif; ?>
			</span>
		</div>

		<?php if ( $issue_rows ) : ?>
		<div class="awb-dw-issues" id="awb-dw-issues">
			<?php foreach ( $issue_rows as $row ) : ?>
			<div class="awb-dw-issue-row">
				<span><?php echo esc_html( $row['label'] ); ?></span>
				<span style="display:flex;align-items:center;gap:10px">
					<span class="awb-dw-issue-count" style="color:<?php echo $issues ? '#b32d2e' : '#00a32a'; ?>"><?php echo (int) $row['count']; ?></span>
					<a class="awb-dw-issue-fix" href="<?php echo esc_url( $row['url'] ); ?>">Fix →</a>
				</span>
			</div>
			<?php endforeach; ?>
		</div>
		<?php endif; ?>

		<p class="awb-dw-footer">
			<a href="<?php echo esc_url( $dashboard_url ); ?>">View full CitedSEO dashboard →</a>
		</p>
		<?php
	}
}