<?php
/**
 * Plugin Name: Speakers for The Events Calendar
 * Plugin URI:  https://github.com/lhorrocks-barlow/speakers-for-the-events-calendar
 * Description: Add speaker profiles to The Events Calendar events. Registers a Speaker custom post type, provides a searchable speaker picker on event edit screens, displays speakers on event pages, and includes a CSV bulk importer.
 * Version:     1.0.0
 * Author:      Lauz Horrocks-Barlow
 * Author URI:  https://ocf.co.uk
 * Text Domain: speakers-for-tec
 * Domain Path: /languages
 * License:     GPLv2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Requires at least: 6.0
 * Requires PHP: 8.0
 */

defined( 'ABSPATH' ) || exit;

final class Speakers_For_TEC {

	const CPT      = 'tec_speaker';
	const META_KEY = '_tec_event_speakers'; // stored on tribe_events posts

	// -------------------------------------------------------------------------
	// Boot
	// -------------------------------------------------------------------------

	public function __construct() {
		add_action( 'init',                           [ $this, 'register_cpt' ] );
		add_action( 'add_meta_boxes',                 [ $this, 'add_meta_boxes' ] );
		add_action( 'save_post',                      [ $this, 'save_meta' ], 10, 2 );
		add_action( 'admin_menu',                     [ $this, 'add_admin_menu' ] );
		add_action( 'admin_post_sftec_import',        [ $this, 'handle_csv_import' ] );
		add_action( 'admin_notices',                  [ $this, 'admin_notices' ] );
		add_action( 'admin_enqueue_scripts',          [ $this, 'admin_enqueue_scripts' ] );
		add_shortcode( 'tec_speakers',                [ $this, 'speakers_shortcode' ] );

		// TEC single-event display — hook fires after the event meta block
		add_action( 'tribe_events_single_event_after_the_meta', [ $this, 'display_event_speakers' ] );
	}

	// -------------------------------------------------------------------------
	// Custom post type
	// -------------------------------------------------------------------------

	public function register_cpt(): void {
		register_post_type( self::CPT, [
			'labels' => [
				'name'               => __( 'Speakers',           'speakers-for-tec' ),
				'singular_name'      => __( 'Speaker',            'speakers-for-tec' ),
				'add_new_item'       => __( 'Add New Speaker',     'speakers-for-tec' ),
				'edit_item'          => __( 'Edit Speaker',        'speakers-for-tec' ),
				'new_item'           => __( 'New Speaker',         'speakers-for-tec' ),
				'view_item'          => __( 'View Speaker',        'speakers-for-tec' ),
				'search_items'       => __( 'Search Speakers',     'speakers-for-tec' ),
				'not_found'          => __( 'No speakers found',   'speakers-for-tec' ),
				'not_found_in_trash' => __( 'No speakers in trash','speakers-for-tec' ),
				'all_items'          => __( 'All Speakers',        'speakers-for-tec' ),
				'menu_name'          => __( 'Speakers',            'speakers-for-tec' ),
			],
			'public'             => true,
			'publicly_queryable' => true,
			'show_ui'            => true,
			'show_in_menu'       => true,
			'query_var'          => true,
			'rewrite'            => [ 'slug' => 'speakers' ],
			'capability_type'    => 'post',
			'has_archive'        => true,
			'hierarchical'       => false,
			'menu_position'      => 6,
			'menu_icon'          => 'dashicons-groups',
			'supports'           => [ 'title', 'editor', 'thumbnail', 'excerpt' ],
			'show_in_rest'       => true,
		] );
	}

	// -------------------------------------------------------------------------
	// Meta boxes
	// -------------------------------------------------------------------------

	public function add_meta_boxes(): void {
		// Extra fields on speaker edit screen
		add_meta_box(
			'sftec_speaker_details',
			__( 'Speaker Details', 'speakers-for-tec' ),
			[ $this, 'render_speaker_details_meta' ],
			self::CPT,
			'side',
			'default'
		);

		// Speaker picker on TEC event edit screen
		if ( post_type_exists( 'tribe_events' ) ) {
			add_meta_box(
				'sftec_event_speakers',
				__( 'Speakers', 'speakers-for-tec' ),
				[ $this, 'render_event_speakers_meta' ],
				'tribe_events',
				'normal',
				'default'
			);
		}
	}

	public function render_speaker_details_meta( \WP_Post $post ): void {
		wp_nonce_field( 'sftec_speaker_details_save', '_sftec_speaker_nonce' );
		$website = get_post_meta( $post->ID, '_tec_speaker_website', true );
		$email   = get_post_meta( $post->ID, '_tec_speaker_email',   true );
		?>
		<p>
			<label><strong><?php esc_html_e( 'Website URL', 'speakers-for-tec' ); ?></strong></label><br>
			<input type="url" name="sftec_speaker_website" value="<?php echo esc_attr( $website ); ?>" style="width:100%;margin-top:4px">
		</p>
		<p>
			<label><strong><?php esc_html_e( 'Email', 'speakers-for-tec' ); ?></strong></label><br>
			<input type="email" name="sftec_speaker_email" value="<?php echo esc_attr( $email ); ?>" style="width:100%;margin-top:4px">
		</p>
		<p style="font-size:0.85em;color:#666"><?php esc_html_e( 'Use the Featured Image box above to set the speaker photo.', 'speakers-for-tec' ); ?></p>
		<?php
	}

	public function render_event_speakers_meta( \WP_Post $post ): void {
		wp_nonce_field( 'sftec_event_speakers_save', '_sftec_event_speakers_nonce' );

		$selected = (array) ( get_post_meta( $post->ID, self::META_KEY, true ) ?: [] );

		$speakers = get_posts( [
			'post_type'      => self::CPT,
			'posts_per_page' => -1,
			'orderby'        => 'title',
			'order'          => 'ASC',
			'post_status'    => 'publish',
		] );

		if ( empty( $speakers ) ) {
			printf(
				'<p><em>%s <a href="%s">%s</a></em></p>',
				esc_html__( 'No speakers yet.', 'speakers-for-tec' ),
				esc_url( admin_url( 'post-new.php?post_type=' . self::CPT ) ),
				esc_html__( 'Add speakers first, then return here to attach them.', 'speakers-for-tec' )
			);
			return;
		}

		echo '<select id="sftec-speaker-select" name="sftec_event_speakers[]" multiple style="width:100%">';
		foreach ( $speakers as $speaker ) {
			printf(
				'<option value="%d"%s>%s</option>',
				$speaker->ID,
				in_array( $speaker->ID, $selected, true ) ? ' selected' : '',
				esc_html( $speaker->post_title )
			);
		}
		echo '</select>';
		echo '<p style="margin-top:6px;font-size:0.82em;color:#666">'
			. esc_html__( 'Type to search. Click a name to add, click again to remove.', 'speakers-for-tec' )
			. '</p>';
	}

	// -------------------------------------------------------------------------
	// Saving meta
	// -------------------------------------------------------------------------

	public function save_meta( int $post_id, \WP_Post $post ): void {
		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return;
		}

		// Speaker detail fields
		if (
			isset( $_POST['_sftec_speaker_nonce'] )
			&& wp_verify_nonce( $_POST['_sftec_speaker_nonce'], 'sftec_speaker_details_save' )
			&& $post->post_type === self::CPT
			&& current_user_can( 'edit_post', $post_id )
		) {
			update_post_meta( $post_id, '_tec_speaker_website', sanitize_url( $_POST['sftec_speaker_website'] ?? '' ) );
			update_post_meta( $post_id, '_tec_speaker_email',   sanitize_email( $_POST['sftec_speaker_email']   ?? '' ) );
		}

		// Event → speaker associations
		if (
			isset( $_POST['_sftec_event_speakers_nonce'] )
			&& wp_verify_nonce( $_POST['_sftec_event_speakers_nonce'], 'sftec_event_speakers_save' )
			&& $post->post_type === 'tribe_events'
			&& current_user_can( 'edit_post', $post_id )
		) {
			$ids = array_map( 'intval', (array) ( $_POST['sftec_event_speakers'] ?? [] ) );
			update_post_meta( $post_id, self::META_KEY, array_filter( $ids ) );
		}
	}

	// -------------------------------------------------------------------------
	// Front-end: speakers on event pages
	// -------------------------------------------------------------------------

	public function display_event_speakers(): void {
		$post_id     = get_the_ID();
		$speaker_ids = (array) ( get_post_meta( $post_id, self::META_KEY, true ) ?: [] );

		if ( empty( $speaker_ids ) ) {
			return;
		}

		$speakers = get_posts( [
			'post_type'      => self::CPT,
			'post__in'       => $speaker_ids,
			'posts_per_page' => -1,
			'orderby'        => 'post__in',
			'post_status'    => 'publish',
		] );

		if ( empty( $speakers ) ) {
			return;
		}

		$this->enqueue_styles();

		$heading = count( $speakers ) > 1
			? __( 'Speakers', 'speakers-for-tec' )
			: __( 'Speaker',  'speakers-for-tec' );

		echo '<section class="sftec-event-speakers">';
		echo '<h3 class="sftec-speakers-heading">' . esc_html( $heading ) . '</h3>';
		echo '<div class="sftec-speakers-list">';

		foreach ( $speakers as $speaker ) {
			$this->render_speaker_card( $speaker, 'event' );
		}

		echo '</div></section>';
	}

	// -------------------------------------------------------------------------
	// Shortcode: [tec_speakers limit="20" search=""]
	// -------------------------------------------------------------------------

	public function speakers_shortcode( array $atts ): string {
		$atts = shortcode_atts( [ 'limit' => 50, 'search' => '' ], $atts, 'tec_speakers' );

		$args = [
			'post_type'      => self::CPT,
			'posts_per_page' => (int) $atts['limit'],
			'orderby'        => 'title',
			'order'          => 'ASC',
			'post_status'    => 'publish',
		];
		if ( $atts['search'] ) {
			$args['s'] = sanitize_text_field( $atts['search'] );
		}

		$speakers = get_posts( $args );
		if ( empty( $speakers ) ) {
			return '<p>' . esc_html__( 'No speakers found.', 'speakers-for-tec' ) . '</p>';
		}

		$this->enqueue_styles();

		ob_start();
		echo '<div class="sftec-speakers-archive">';
		foreach ( $speakers as $speaker ) {
			$this->render_speaker_card( $speaker, 'archive' );
		}
		echo '</div>';

		return ob_get_clean();
	}

	// -------------------------------------------------------------------------
	// Shared card renderer
	// -------------------------------------------------------------------------

	private function render_speaker_card( \WP_Post $speaker, string $context = 'event' ): void {
		$permalink = get_permalink( $speaker->ID );
		$website   = get_post_meta( $speaker->ID, '_tec_speaker_website', true );

		echo '<article class="sftec-speaker-card sftec-speaker-card--' . esc_attr( $context ) . '">';

		if ( has_post_thumbnail( $speaker->ID ) ) {
			echo '<div class="sftec-speaker-photo">';
			echo '<a href="' . esc_url( $permalink ) . '">';
			echo get_the_post_thumbnail( $speaker->ID, [ 80, 80 ], [ 'class' => 'sftec-speaker-img' ] );
			echo '</a>';
			echo '</div>';
		}

		echo '<div class="sftec-speaker-info">';
		echo '<h4 class="sftec-speaker-name"><a href="' . esc_url( $permalink ) . '">' . esc_html( $speaker->post_title ) . '</a></h4>';

		$excerpt = $speaker->post_excerpt ?: wp_trim_words( wp_strip_all_tags( $speaker->post_content ), 30 );
		if ( $excerpt ) {
			echo '<p class="sftec-speaker-bio">' . esc_html( $excerpt ) . '</p>';
		}

		if ( $website ) {
			echo '<a href="' . esc_url( $website ) . '" class="sftec-speaker-link" target="_blank" rel="noopener noreferrer">'
				. esc_html__( 'Website', 'speakers-for-tec' ) . ' &rarr;</a>';
		}

		echo '</div>';
		echo '</article>';
	}

	// -------------------------------------------------------------------------
	// Styles (enqueued once per page load)
	// -------------------------------------------------------------------------

	private function enqueue_styles(): void {
		static $done = false;
		if ( $done ) {
			return;
		}
		$done = true;

		echo '<style id="sftec-speakers-css">
.sftec-event-speakers { margin: 2em 0; border-top: 1px solid #e0e0e0; padding-top: 1.5em; }
.sftec-speakers-heading { font-size: 1.15em; font-weight: 600; margin: 0 0 1em; }
.sftec-speakers-list,
.sftec-speakers-archive { display: flex; flex-wrap: wrap; gap: 1.25em; }
.sftec-speaker-card { display: flex; gap: 0.85em; align-items: flex-start; flex: 1 1 260px; max-width: 420px; }
.sftec-speaker-photo img { border-radius: 50%; width: 64px; height: 64px; object-fit: cover; display: block; }
.sftec-speaker-info { flex: 1; min-width: 0; }
.sftec-speaker-name { margin: 0 0 0.3em; font-size: 1em; font-weight: 600; }
.sftec-speaker-name a { text-decoration: none; color: inherit; }
.sftec-speaker-name a:hover { text-decoration: underline; }
.sftec-speaker-bio { margin: 0 0 0.4em; font-size: 0.875em; color: #555; line-height: 1.4; }
.sftec-speaker-link { font-size: 0.825em; }
</style>';
	}

	// -------------------------------------------------------------------------
	// Admin: Select2 on event edit screens
	// -------------------------------------------------------------------------

	public function admin_enqueue_scripts( string $hook ): void {
		$screen = get_current_screen();
		if ( ! $screen || $screen->post_type !== 'tribe_events' || ! in_array( $hook, [ 'post.php', 'post-new.php' ], true ) ) {
			return;
		}

		// Use WP-bundled Select2 if available (TEC ships it), otherwise CDN fallback
		if ( wp_script_is( 'select2', 'registered' ) ) {
			wp_enqueue_script( 'select2' );
			wp_enqueue_style( 'select2' );
			$handle = 'select2';
		} else {
			wp_enqueue_script(
				'sftec-select2',
				'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/js/select2.min.js',
				[ 'jquery' ],
				'4.1.0',
				true
			);
			wp_enqueue_style(
				'sftec-select2',
				'https://cdn.jsdelivr.net/npm/select2@4.1.0-rc.0/dist/css/select2.min.css',
				[],
				'4.1.0'
			);
			$handle = 'sftec-select2';
		}

		wp_add_inline_script(
			$handle,
			"jQuery(function($){
				$('#sftec-speaker-select').select2({
					placeholder: '" . esc_js( __( 'Search for a speaker…', 'speakers-for-tec' ) ) . "',
					allowClear: true,
					width: '100%'
				});
			});"
		);
	}

	// -------------------------------------------------------------------------
	// Admin: CSV import page
	// -------------------------------------------------------------------------

	public function add_admin_menu(): void {
		add_submenu_page(
			'edit.php?post_type=' . self::CPT,
			__( 'Import Speakers from CSV', 'speakers-for-tec' ),
			__( 'Import CSV',               'speakers-for-tec' ),
			'manage_options',
			'sftec-import-speakers',
			[ $this, 'render_import_page' ]
		);
	}

	public function render_import_page(): void {
		?>
		<div class="wrap">
			<h1><?php esc_html_e( 'Import Speakers from CSV', 'speakers-for-tec' ); ?></h1>

			<p><?php esc_html_e( 'Upload a CSV file with the following columns (header row required):', 'speakers-for-tec' ); ?></p>
			<code>name, bio, email, website, image</code>

			<ul style="list-style:disc;margin-left:1.5em;margin-top:0.5em">
				<li><strong>name</strong> — <?php esc_html_e( "speaker's full name (required)", 'speakers-for-tec' ); ?></li>
				<li><strong>bio</strong> — <?php esc_html_e( 'plain-text biography', 'speakers-for-tec' ); ?></li>
				<li><strong>email</strong> — <?php esc_html_e( 'contact email (stored as private meta)', 'speakers-for-tec' ); ?></li>
				<li><strong>website</strong> — <?php esc_html_e( 'full URL including https://', 'speakers-for-tec' ); ?></li>
				<li><strong>image</strong> — <?php esc_html_e( 'ignored during import (add photos via Featured Image)', 'speakers-for-tec' ); ?></li>
			</ul>

			<p><?php esc_html_e( 'Speakers whose name matches an existing speaker are skipped — no overwrites.', 'speakers-for-tec' ); ?></p>

			<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" enctype="multipart/form-data">
				<?php wp_nonce_field( 'sftec_import_speakers', '_sftec_import_nonce' ); ?>
				<input type="hidden" name="action" value="sftec_import">

				<table class="form-table">
					<tr>
						<th scope="row"><label for="sftec_csv"><?php esc_html_e( 'CSV File', 'speakers-for-tec' ); ?></label></th>
						<td><input type="file" id="sftec_csv" name="speakers_csv" accept=".csv" required></td>
					</tr>
					<tr>
						<th scope="row"><?php esc_html_e( 'Options', 'speakers-for-tec' ); ?></th>
						<td>
							<label>
								<input type="checkbox" name="skip_header" value="1" checked>
								<?php esc_html_e( 'First row is a header (skip it)', 'speakers-for-tec' ); ?>
							</label>
						</td>
					</tr>
				</table>

				<?php submit_button( __( 'Import Speakers', 'speakers-for-tec' ) ); ?>
			</form>
		</div>
		<?php
	}

	public function handle_csv_import(): void {
		if (
			! current_user_can( 'manage_options' )
			|| ! wp_verify_nonce( $_POST['_sftec_import_nonce'] ?? '', 'sftec_import_speakers' )
		) {
			wp_die( 'Unauthorised' );
		}

		if ( empty( $_FILES['speakers_csv']['tmp_name'] ) ) {
			wp_redirect( $this->import_redirect( [ 'sftec_err' => 'no_file' ] ) );
			exit;
		}

		$handle = fopen( $_FILES['speakers_csv']['tmp_name'], 'r' );
		if ( ! $handle ) {
			wp_redirect( $this->import_redirect( [ 'sftec_err' => 'read_fail' ] ) );
			exit;
		}

		$skip_header = ! empty( $_POST['skip_header'] );

		// Build name index to prevent duplicates
		$existing_ids = get_posts( [
			'post_type'      => self::CPT,
			'posts_per_page' => -1,
			'fields'         => 'ids',
			'post_status'    => 'any',
		] );
		$existing_names = [];
		foreach ( $existing_ids as $id ) {
			$existing_names[ $this->normalise_name( get_the_title( $id ) ) ] = true;
		}

		$created = $skipped = $errors = 0;
		$row_num = 0;

		while ( ( $row = fgetcsv( $handle ) ) !== false ) {
			$row_num++;
			if ( $skip_header && $row_num === 1 ) {
				continue;
			}
			if ( empty( array_filter( $row ) ) ) {
				continue;
			}

			[ $name, $bio, $email, $website ] = array_pad( $row, 4, '' );
			$name = trim( $name );

			if ( ! $name ) {
				continue;
			}

			$key = $this->normalise_name( $name );
			if ( isset( $existing_names[ $key ] ) ) {
				$skipped++;
				continue;
			}

			$post_id = wp_insert_post( [
				'post_type'    => self::CPT,
				'post_title'   => sanitize_text_field( $name ),
				'post_content' => wp_kses_post( $bio ),
				'post_excerpt' => wp_trim_words( wp_strip_all_tags( $bio ), 30 ),
				'post_status'  => 'publish',
			] );

			if ( is_wp_error( $post_id ) ) {
				$errors++;
				continue;
			}

			if ( $email ) {
				update_post_meta( $post_id, '_tec_speaker_email', sanitize_email( trim( $email ) ) );
			}
			if ( $website ) {
				update_post_meta( $post_id, '_tec_speaker_website', sanitize_url( trim( $website ) ) );
			}

			$existing_names[ $key ] = true;
			$created++;
		}

		fclose( $handle );

		wp_redirect( $this->import_redirect( [
			'sftec_created' => $created,
			'sftec_skipped' => $skipped,
			'sftec_errors'  => $errors,
		] ) );
		exit;
	}

	private function import_redirect( array $args ): string {
		return add_query_arg(
			array_merge( [ 'post_type' => self::CPT, 'page' => 'sftec-import-speakers' ], $args ),
			admin_url( 'edit.php' )
		);
	}

	private function normalise_name( string $name ): string {
		$name = strtolower( trim( $name ) );
		$name = preg_replace( '/^(dr\.?|prof\.?|mr\.?|mrs\.?|ms\.?|miss\.?)\s+/u', '', $name );
		return preg_replace( '/\s+/', ' ', $name );
	}

	// -------------------------------------------------------------------------
	// Admin notices: import result banner
	// -------------------------------------------------------------------------

	public function admin_notices(): void {
		if ( ! isset( $_GET['sftec_created'] ) && ! isset( $_GET['sftec_err'] ) ) {
			return;
		}

		if ( isset( $_GET['sftec_err'] ) ) {
			$msgs = [
				'no_file'   => __( 'No file was uploaded.',            'speakers-for-tec' ),
				'read_fail' => __( 'Could not read the uploaded file.', 'speakers-for-tec' ),
			];
			$msg = $msgs[ $_GET['sftec_err'] ] ?? __( 'An unknown error occurred.', 'speakers-for-tec' );
			printf(
				'<div class="notice notice-error is-dismissible"><p>%s %s</p></div>',
				esc_html__( 'Import failed:', 'speakers-for-tec' ),
				esc_html( $msg )
			);
			return;
		}

		printf(
			'<div class="notice notice-success is-dismissible"><p>'
			. __( 'Import complete &mdash; <strong>%d created</strong>, %d skipped (already exist), %d errors.', 'speakers-for-tec' )
			. '</p></div>',
			(int) $_GET['sftec_created'],
			(int) $_GET['sftec_skipped'],
			(int) $_GET['sftec_errors']
		);
	}
}

new Speakers_For_TEC();