<?php
/**
 * Frontend: assets, templates, filters, shortcodes.
 *
 * @package Kanzelbuch
 */

defined( 'ABSPATH' ) || exit;

/**
 * Register frontend assets.
 */
function fegp_assets() {
	wp_register_style( 'fegp', FEGP_URL . 'assets/css/fegp.css', array(), FEGP_VERSION );
	$o = fegp_options();
	wp_add_inline_style( 'fegp', ':root{--fegp-accent:' . sanitize_hex_color( $o['accent'] ) . ';}' );
	wp_register_script( 'fegp', FEGP_URL . 'assets/js/fegp.js', array(), FEGP_VERSION, true );
	if ( is_singular( 'sermons' ) || is_post_type_archive( 'sermons' ) || is_tax( array( 'sermon_speaker', 'sermon_topics', 'sermon_book', 'feg_topic_group' ) ) ) {
		wp_enqueue_style( 'fegp' );
		wp_enqueue_script( 'fegp' );
	}
}
add_action( 'wp_enqueue_scripts', 'fegp_assets' );

/**
 * Filter taxonomies: query arg => taxonomy.
 *
 * @return array
 */
function fegp_filter_map() {
	return array(
		'prediger' => 'sermon_speaker',
		'thema'    => 'sermon_topics',
		'buch'     => 'sermon_book',
		'gruppe'   => 'feg_topic_group',
	);
}

/**
 * Current filter values from the URL (public, read-only GET filters; no nonce needed).
 *
 * @return array
 */
function fegp_current_filters() {
	$out = array();
	foreach ( fegp_filter_map() as $arg => $tax ) {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only public archive filter.
		$out[ $arg ] = isset( $_GET[ $arg ] ) ? sanitize_title( wp_unslash( $_GET[ $arg ] ) ) : '';
	}
	return $out;
}

/**
 * Build tax_query from filters.
 *
 * @return array
 */
function fegp_tax_query() {
	$map = fegp_filter_map();
	$tq  = array();
	foreach ( fegp_current_filters() as $arg => $val ) {
		if ( '' === $val ) {
			continue;
		}
		if ( 'gruppe' === $arg ) {
			$g = get_term_by( 'slug', $val, 'feg_topic_group' );
			if ( ! $g ) {
				continue;
			}
			$ids    = array_merge( array( $g->term_id ), get_term_children( $g->term_id, 'feg_topic_group' ) );
			$topics = get_terms(
				array(
					'taxonomy'   => 'sermon_topics',
					'hide_empty' => false,
					'fields'     => 'ids',
					'meta_query' => array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_query -- Small term set.
						array(
							'key'     => 'fegp_group_id',
							'value'   => $ids,
							'compare' => 'IN',
						),
					),
				)
			);
			$or     = array(
				'relation' => 'OR',
				array(
					'taxonomy' => 'feg_topic_group',
					'terms'    => $ids,
				),
			);
			if ( $topics && ! is_wp_error( $topics ) ) {
				$or[] = array(
					'taxonomy' => 'sermon_topics',
					'terms'    => $topics,
				);
			}
			$tq[] = $or;
		} else {
			$tq[] = array(
				'taxonomy' => $map[ $arg ],
				'field'    => 'slug',
				'terms'    => $val,
			);
		}
	}
	return $tq;
}

/**
 * Apply filters and page size on the sermon archive main query.
 *
 * @param WP_Query $q Query.
 */
function fegp_pre_get_posts( $q ) {
	if ( is_admin() || ! $q->is_main_query() || ! $q->is_post_type_archive( 'sermons' ) ) {
		return;
	}
	$o = fegp_options();
	$q->set( 'posts_per_page', (int) $o['per_page'] );
	$tq = fegp_tax_query();
	if ( $tq ) {
		$q->set( 'tax_query', $tq ); // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query -- Filtering is the purpose.
	}
}
add_action( 'pre_get_posts', 'fegp_pre_get_posts' );

/**
 * Use plugin templates on classic themes.
 *
 * @param string $template Template path.
 * @return string
 */
function fegp_template_include( $template ) {
	$o = fegp_options();
	if ( ! $o['use_templates'] || ( function_exists( 'wp_is_block_theme' ) && wp_is_block_theme() ) ) {
		return $template;
	}
	if ( is_singular( 'sermons' ) ) {
		$theme = locate_template( 'feg-predigten/single.php' );
		return $theme ? $theme : FEGP_DIR . 'templates/single-sermons.php';
	}
	if ( is_post_type_archive( 'sermons' ) || is_tax( array( 'sermon_speaker', 'sermon_topics', 'sermon_book', 'feg_topic_group' ) ) ) {
		$theme = locate_template( 'feg-predigten/archive.php' );
		return $theme ? $theme : FEGP_DIR . 'templates/archive-sermons.php';
	}
	return $template;
}
add_filter( 'template_include', 'fegp_template_include', 99 );

/**
 * Block themes: append details and player to the content.
 *
 * @param string $content Content.
 * @return string
 */
function fegp_content_filter( $content ) {
	if ( ! is_singular( 'sermons' ) || ! in_the_loop() || ! is_main_query() ) {
		return $content;
	}
	$o = fegp_options();
	if ( $o['use_templates'] && ! ( function_exists( 'wp_is_block_theme' ) && wp_is_block_theme() ) ) {
		return $content;
	}
	return fegp_meta_list( get_the_ID() ) . $content . '<div class="fegp-player">' . fegp_player( get_the_ID() ) . '</div>';
}
add_filter( 'the_content', 'fegp_content_filter' );

/**
 * Details list (speaker, topic, book, passage).
 *
 * @param int $post_id Post ID.
 * @return string
 */
function fegp_meta_list( $post_id ) {
	$rows    = array(
		__( 'Speaker', 'kanzelbuch' )    => fegp_terms( $post_id, 'sermon_speaker' ),
		__( 'Topic', 'kanzelbuch' )      => fegp_terms( $post_id, 'sermon_topics' ),
		__( 'Bible book', 'kanzelbuch' ) => fegp_terms( $post_id, 'sermon_book' ),
		__( 'Bible passage', 'kanzelbuch' ) => esc_html( get_post_meta( $post_id, 'asp_sermon_bible_passage', true ) ),
	);
	$html = '<dl class="fegp-meta">';
	foreach ( $rows as $label => $val ) {
		if ( '' !== $val ) {
			$html .= '<div><dt>' . esc_html( $label ) . '</dt><dd>' . $val . '</dd></div>';
		}
	}
	return $html . '</dl>';
}

/**
 * Filter form.
 *
 * @param string $action Form action URL.
 * @return string
 */
function fegp_filter_form( $action ) {
	$cur    = fegp_current_filters();
	$labels = array(
		'prediger' => __( 'Speaker', 'kanzelbuch' ),
		'thema'    => __( 'Topic', 'kanzelbuch' ),
		'buch'     => __( 'Bible book', 'kanzelbuch' ),
	);
	$map    = fegp_filter_map();
	$html   = '<form class="fegp-filter" method="get" action="' . esc_url( $action ) . '">';
	foreach ( $labels as $arg => $label ) {
		$terms = get_terms(
			array(
				'taxonomy'   => $map[ $arg ],
				'hide_empty' => true,
			)
		);
		if ( 'buch' === $arg && ! is_wp_error( $terms ) ) {
			$terms = fegp_sort_books( $terms );
		}
		$html .= '<label><span>' . esc_html( $label ) . '</span><select name="' . esc_attr( $arg ) . '"><option value="">' . esc_html__( 'All', 'kanzelbuch' ) . '</option>';
		if ( ! is_wp_error( $terms ) ) {
			foreach ( $terms as $t ) {
				$html .= '<option value="' . esc_attr( $t->slug ) . '"' . selected( $cur[ $arg ], $t->slug, false ) . '>' . esc_html( $t->name ) . '</option>';
			}
		}
		$html .= '</select></label>';
	}
	$html  .= '<noscript><button type="submit">' . esc_html__( 'Filter', 'kanzelbuch' ) . '</button></noscript>';
	$groups = get_terms(
		array(
			'taxonomy'   => 'feg_topic_group',
			'hide_empty' => false,
			'parent'     => 0,
		)
	);
	if ( $groups && ! is_wp_error( $groups ) ) {
		$html .= '<details class="fegp-groups"' . ( $cur['gruppe'] ? ' open' : '' ) . '><summary>' . esc_html__( 'Topic groups', 'kanzelbuch' ) . '</summary><div class="fegp-chips">';
		$base  = remove_query_arg( array( 'gruppe', 'paged', 'fegp_seite' ), add_query_arg( array_filter( $cur ), $action ) );
		$html .= '<a class="fegp-chip' . ( $cur['gruppe'] ? '' : ' is-active' ) . '" href="' . esc_url( $base ) . '">' . esc_html__( 'All', 'kanzelbuch' ) . '</a>';
		foreach ( $groups as $g ) {
			$html .= '<a class="fegp-chip' . ( $cur['gruppe'] === $g->slug ? ' is-active' : '' ) . '" href="' . esc_url( add_query_arg( 'gruppe', $g->slug, $base ) ) . '">' . esc_html( $g->name ) . '</a>';
		}
		$html .= '</div></details>';
		if ( $cur['gruppe'] ) {
			$html .= '<input type="hidden" name="gruppe" value="' . esc_attr( $cur['gruppe'] ) . '">';
		}
	}
	if ( array_filter( $cur ) ) {
		$html .= '<a class="fegp-reset" href="' . esc_url( $action ) . '">' . esc_html__( 'Reset filters', 'kanzelbuch' ) . '</a>';
	}
	return $html . '</form>';
}

/**
 * Grid of tiles for a query.
 *
 * @param WP_Query $q Query.
 * @return string
 */
function fegp_grid( $q ) {
	if ( ! $q->have_posts() ) {
		return '<p class="fegp-empty">' . esc_html__( 'No sermons found.', 'kanzelbuch' ) . '</p>';
	}
	$html = '<div class="fegp-grid">';
	foreach ( $q->posts as $p ) {
		$html .= fegp_tile( $p->ID );
	}
	return $html . '</div>';
}

/**
 * Slider shortcode.
 *
 * @param array $atts Attributes.
 * @return string
 */
function fegp_slider_shortcode( $atts ) {
	$atts = shortcode_atts(
		array(
			'anzahl' => 6,
			'gruppe' => '',
		),
		$atts,
		'feg_predigten_slider'
	);
	$args = array(
		'post_type'           => 'sermons',
		'posts_per_page'      => max( 1, min( 24, absint( $atts['anzahl'] ) ) ),
		'ignore_sticky_posts' => true,
		'no_found_rows'       => true,
	);
	if ( $atts['gruppe'] ) {
		$args['tax_query'] = array( // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query -- Optional filter.
			array(
				'taxonomy' => 'feg_topic_group',
				'field'    => 'slug',
				'terms'    => sanitize_title( $atts['gruppe'] ),
			),
		);
	}
	$q = new WP_Query( $args );
	if ( ! $q->have_posts() ) {
		return '';
	}
	wp_enqueue_style( 'fegp' );
	wp_enqueue_script( 'fegp' );
	$html = '<div class="fegp-slider" role="region" aria-label="' . esc_attr__( 'Latest sermons', 'kanzelbuch' ) . '">';
	$html .= '<button type="button" class="fegp-nav fegp-prev" aria-label="' . esc_attr__( 'Previous', 'kanzelbuch' ) . '">&#8249;</button>';
	$html .= '<div class="fegp-track">';
	foreach ( $q->posts as $p ) {
		$html .= fegp_tile( $p->ID );
	}
	$html .= '</div><button type="button" class="fegp-nav fegp-next" aria-label="' . esc_attr__( 'Next', 'kanzelbuch' ) . '">&#8250;</button></div>';
	return $html;
}
add_shortcode( 'feg_predigten_slider', 'fegp_slider_shortcode' );

/**
 * Archive shortcode.
 *
 * @return string
 */
function fegp_archive_shortcode() {
	wp_enqueue_style( 'fegp' );
	wp_enqueue_script( 'fegp' );
	$o = fegp_options();
	// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- Read-only pagination.
	$page = isset( $_GET['fegp_seite'] ) ? max( 1, absint( $_GET['fegp_seite'] ) ) : 1;
	$args = array(
		'post_type'      => 'sermons',
		'posts_per_page' => (int) $o['per_page'],
		'paged'          => $page,
	);
	$tq   = fegp_tax_query();
	if ( $tq ) {
		$args['tax_query'] = $tq; // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query -- Filtering is the purpose.
	}
	$q     = new WP_Query( $args );
	$url   = get_permalink();
	$html  = '<div class="fegp-archive">' . fegp_filter_form( $url ) . fegp_grid( $q );
	$links = paginate_links(
		array(
			'base'    => add_query_arg( 'fegp_seite', '%#%' ),
			'format'  => '',
			'current' => $page,
			'total'   => $q->max_num_pages,
		)
	);
	if ( $links ) {
		$html .= '<nav class="fegp-pagination">' . $links . '</nav>';
	}
	wp_reset_postdata();
	return $html . '</div>';
}
add_shortcode( 'feg_predigten_archiv', 'fegp_archive_shortcode' );