<?php
/**
 * Renders active popups on the frontend and enqueues scripts/styles.
 */

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

class FOXCP_Frontend {

	/** Fallback: days before re-appearance if no per-popup setting exists. */
	const COOKIE_DAYS_FALLBACK = 30;

	public function __construct() {
		add_action( 'wp_enqueue_scripts', [ $this, 'maybe_enqueue_assets' ] );
		add_action( 'wp_footer', [ $this, 'render_popups' ] );
	}

	// -------------------------------------------------------------------------
	// Asset loading
	// -------------------------------------------------------------------------

	public function maybe_enqueue_assets() {
		$popups     = $this->get_active_popups();
		$preview_id = $this->get_preview_id();

		if ( empty( $popups ) && ! $preview_id ) {
			return;
		}

		// Ensure Gutenberg block styles (alignments, colours, etc.) are loaded.
		wp_enqueue_style( 'wp-block-library' );

		wp_enqueue_style(
			'foxcp-frontend',
			FOXCP_PLUGIN_URL . 'assets/css/popup-frontend.css',
			[ 'wp-block-library' ],
			FOXCP_VERSION
		);

		wp_enqueue_script(
			'foxcp-frontend',
			FOXCP_PLUGIN_URL . 'assets/js/popup-frontend.js',
			[],
			FOXCP_VERSION,
			true
		);

		// Build popup config for JS.
		$popup_data = [];

		foreach ( $popups as $popup ) {
			$popup_data[] = [
				'id'             => $popup->ID,
				'delay'          => (int) get_post_meta( $popup->ID, '_foxcp_trigger_delay', true ),
				'scroll'         => (int) get_post_meta( $popup->ID, '_foxcp_trigger_scroll', true ),
				'preview'        => false,
				'cookieAlways'   => (bool) get_post_meta( $popup->ID, '_foxcp_cookie_always', true ),
				'cookieDuration' => (int) ( get_post_meta( $popup->ID, '_foxcp_cookie_duration', true ) ?: self::COOKIE_DAYS_FALLBACK ),
				'cookieUnit'     => get_post_meta( $popup->ID, '_foxcp_cookie_unit', true ) ?: 'days',
				'animation'      => get_post_meta( $popup->ID, '_foxcp_animation', true ) ?: 'none',
				'exitIntent'     => (bool) get_post_meta( $popup->ID, '_foxcp_trigger_exit_intent', true ),
				'imageMode'      => (bool) get_post_meta( $popup->ID, '_foxcp_image_mode', true ),
				'linkUrl'        => get_post_meta( $popup->ID, '_foxcp_link_url', true ) ?: '',
			];
		}

		// Preview popup: show immediately, skip cookie check.
		if ( $preview_id ) {
			// Only add once – avoid duplicate if it's already in the regular list.
			$already_listed = array_filter( $popup_data, static function ( $p ) use ( $preview_id ) {
				return (int) $p['id'] === $preview_id;
			} );

			if ( empty( $already_listed ) ) {
				$popup_data[] = [
					'id'      => $preview_id,
					'delay'   => 0,
					'scroll'  => 0,
					'preview' => true,
				];
			} else {
				// Force immediate display for the preview entry.
				foreach ( $popup_data as &$p ) {
					if ( (int) $p['id'] === $preview_id ) {
						$p['preview'] = true;
						$p['delay']   = 0;
						$p['scroll']  = 0;
					}
				}
				unset( $p );
			}
		}

		wp_localize_script( 'foxcp-frontend', 'foxcpData', [
			'popups' => $popup_data,
		] );
	}

	// -------------------------------------------------------------------------
	// HTML output
	// -------------------------------------------------------------------------

	public function render_popups() {
		$popups     = $this->get_active_popups();
		$preview_id = $this->get_preview_id();

		if ( empty( $popups ) && ! $preview_id ) {
			return;
		}

		// Merge preview popup into render list if not already present.
		$ids_to_render = array_map( static function ( $p ) { return $p->ID; }, $popups );

		if ( $preview_id && ! in_array( $preview_id, $ids_to_render, true ) ) {
			$preview_post = get_post( $preview_id );
			if ( $preview_post ) {
				$popups[] = $preview_post;
			}
		}

		// Save the current global post so we can restore it afterwards.
		global $post;
		$original_post = $post;

		foreach ( $popups as $popup ) {
			$popup_id   = (int) $popup->ID;
			$image_mode = (bool) get_post_meta( $popup_id, '_foxcp_image_mode', true );
			$link_url   = get_post_meta( $popup_id, '_foxcp_link_url', true );

			$popup_classes = 'foxcp-popup';
			if ( $image_mode ) {
				$popup_classes .= ' foxcp-image-mode';
			}

			// Switch the global post context to this popup so that
			// the_content() and all its filters operate on the popup's
			// own post_content – not the content of the page being viewed.
			$post = $popup; // phpcs:ignore WordPress.WP.GlobalVariablesOverride
			setup_postdata( $popup );
			?>
			<div
				class="foxcp-overlay"
				id="foxcp-overlay-<?php echo absint( $popup_id ); ?>"
				role="dialog"
				aria-modal="true"
				aria-label="<?php echo esc_attr( get_the_title( $popup_id ) ); ?>"
				style="display:none;"
			>
				<div class="<?php echo esc_attr( $popup_classes ); ?>" id="foxcp-popup-<?php echo absint( $popup_id ); ?>"<?php if ( $link_url ) : ?> data-foxcp-link="<?php echo esc_url( $link_url ); ?>"<?php endif; ?>>
					<button
						class="foxcp-close"
						aria-label="<?php esc_attr_e( 'Close popup', '2fox4-custom-popup' ); ?>"
					>&times;</button>
					<div class="foxcp-content">
						<?php the_content(); ?>
					</div>
				</div>
			</div>
			<?php
		}

		// Restore the original post context.
		$post = $original_post; // phpcs:ignore WordPress.WP.GlobalVariablesOverride
		wp_reset_postdata();
	}

	// -------------------------------------------------------------------------
	// Query helpers
	// -------------------------------------------------------------------------

	/**
	 * Returns published popups that match the current page context.
	 *
	 * @return WP_Post[]
	 */
	private function get_active_popups() {
		// Only run on supported contexts.
		if ( ! is_front_page() && ! is_single() && ! is_page() ) {
			return [];
		}

		// Fetch all published popups, then filter by meta in PHP.
		// This avoids fragile meta_query boolean comparisons.
		$all_popups = get_posts( [
			'post_type'      => 'foxcp_popup',
			'post_status'    => 'publish',
			'posts_per_page' => -1,
		] );

		if ( empty( $all_popups ) ) {
			return [];
		}

		return array_filter( $all_popups, function ( $popup ) {
			// Cart-abandonment popups are handled by FOXCP_WooCommerce.
			if ( get_post_meta( $popup->ID, '_foxcp_woo_cart_abandonment', true ) ) {
				return false;
			}

			if ( is_front_page() && get_post_meta( $popup->ID, '_foxcp_display_home', true ) ) {
				return true;
			}
			if ( is_single() && get_post_meta( $popup->ID, '_foxcp_display_posts', true ) ) {
				return true;
			}
			if ( is_page() && ! is_front_page() && get_post_meta( $popup->ID, '_foxcp_display_pages', true ) ) {
				return true;
			}
			return false;
		} );
	}

	/**
	 * Returns the popup ID from the ?foxcp_preview=ID query parameter.
	 * Only available to logged-in users who can edit posts.
	 *
	 * @return int|false
	 */
	private function get_preview_id() {
		if ( empty( $_GET['foxcp_preview'] ) ) {
			return false;
		}

		// Only allow editors/admins to use preview mode.
		if ( ! current_user_can( 'edit_posts' ) ) {
			return false;
		}

		$id = absint( $_GET['foxcp_preview'] );

		// Verify nonce to prevent unauthorized preview access.
		if ( ! isset( $_GET['_wpnonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_GET['_wpnonce'] ) ), 'foxcp_preview_' . $id ) ) {
			return false;
		}

		$post = get_post( $id );

		if ( ! $post || 'foxcp_popup' !== $post->post_type ) {
			return false;
		}

		return $id;
	}
}