<?php
/**
 * Link previews (Discord, Facebook, X, messaging apps) and author privacy.
 *
 * Without this, WordPress offers chat apps its own embed card, which shows the author's username
 * (for example "admin") and the bare page title. These pages get proper preview tags instead,
 * and the author pages are closed.
 */

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

/** Make an image address complete (https://domain/...) so chat apps can load it. */
function clanfront_absolute_url( $url ) {
	$url = (string) $url;
	if ( '' === $url ) {
		return '';
	}
	if ( 0 === strpos( $url, '//' ) ) {
		return set_url_scheme( $url );
	}
	if ( 0 === strpos( $url, '/' ) ) {
		$origin = (string) preg_replace( '#^(https?://[^/]+).*$#', '$1', home_url() );
		return $origin . $url;
	}
	return $url;
}

/** What to show in a link preview for the current page: title, description, image, address. */
function clanfront_share_data() {
	$name = clanfront_name();
	$view = clanfront_view();
	$logo = clanfront_setting( 'logo' );
	$data = array(
		'title'       => $name,
		'description' => clanfront_setting( 'tagline' ),
		'image'       => clanfront_setting( 'hero_image' ),
		'url'         => home_url( '/' ),
		'type'        => 'website',
	);

	$post = get_queried_object();

	if ( 'single-member' === $view && $post instanceof WP_Post ) {
		$role  = trim( (string) get_post_meta( $post->ID, 'clanfront_role', true ) );
		$games = trim( (string) get_post_meta( $post->ID, 'clanfront_games', true ) );
		$bits  = array_filter( array( $role, $games ) );
		$data['title']       = get_the_title( $post ) . ' – ' . $name;
		$data['description'] = $bits ? implode( ' · ', $bits ) : 'A member of ' . $name;
		$data['url']         = get_permalink( $post );
		$data['type']        = 'profile';
		if ( has_post_thumbnail( $post ) ) {
			$data['image'] = get_the_post_thumbnail_url( $post, 'large' );
		}
	} elseif ( 'single-match' === $view && $post instanceof WP_Post ) {
		$game = trim( (string) get_post_meta( $post->ID, 'clanfront_game', true ) );
		$data['title']       = get_the_title( $post ) . ' – ' . $name;
		$data['description'] = trim( clanfront_event_kind_label( $post ) . ( $game ? ' · ' . $game : '' ) . ' · ' . clanfront_event_when( $post ), ' ·' );
		$data['url']         = get_permalink( $post );
	} elseif ( 'single-news' === $view && $post instanceof WP_Post ) {
		$data['title']       = get_the_title( $post ) . ' – ' . $name;
		$data['description'] = clanfront_news_summary( $post );
		$data['url']         = get_permalink( $post );
		$data['type']        = 'article';
		if ( has_post_thumbnail( $post ) ) {
			$data['image'] = get_the_post_thumbnail_url( $post, 'large' );
		}
	} elseif ( 'single-tournament' === $view && $post instanceof WP_Post ) {
		$game = trim( (string) get_post_meta( $post->ID, 'clanfront_game', true ) );
		$data['title']       = get_the_title( $post ) . ' – ' . $name;
		$data['description'] = 'Tournament' . ( $game ? ' · ' . $game : '' ) . ' · ' . clanfront_tourney_status( $post );
		$data['url']         = get_permalink( $post );
	} elseif ( 'single-game' === $view && $post instanceof WP_Post ) {
		$note = trim( (string) get_post_meta( $post->ID, 'clanfront_note', true ) );
		$data['title']       = get_the_title( $post ) . ' – ' . $name;
		$data['description'] = $note ? $note : get_the_title( $post ) . ' with ' . $name . '.';
		$data['url']         = get_permalink( $post );
		if ( has_post_thumbnail( $post ) ) {
			$data['image'] = get_the_post_thumbnail_url( $post, 'large' );
		}
	} elseif ( 'archive-game' === $view ) {
		$data['title']       = 'Games – ' . $name;
		$data['description'] = 'The games ' . $name . ' plays.';
		$data['url']         = get_post_type_archive_link( 'clanfront_game' );
	} elseif ( 'archive-shame' === $view ) {
		$data['title']       = 'Hall of Shame – ' . $name;
		$data['description'] = 'The finest friendly-fire moments of ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_shame' );
	} elseif ( 'archive-history' === $view ) {
		$data['title']       = 'History – ' . $name;
		$data['description'] = 'The story of ' . $name . ', milestone by milestone.';
		$data['url']         = get_post_type_archive_link( 'clanfront_milestone' );
	} elseif ( 'archive-member' === $view ) {
		$data['title']       = 'Roster – ' . $name;
		$data['description'] = 'Meet the members of ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_member' );
	} elseif ( 'archive-match' === $view ) {
		$data['title']       = 'Matches – ' . $name;
		$data['description'] = 'Schedule and results for ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_match' );
	} elseif ( 'archive-media' === $view ) {
		$data['title']       = 'Gallery – ' . $name;
		$data['description'] = 'Screenshots and highlight clips from ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_media' );
	} elseif ( 'archive-news' === $view ) {
		$data['title']       = 'News – ' . $name;
		$data['description'] = 'The latest news from ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_news' );
	} elseif ( 'archive-tournament' === $view ) {
		$data['title']       = 'Tournaments – ' . $name;
		$data['description'] = 'Tournaments and brackets from ' . $name . '.';
		$data['url']         = get_post_type_archive_link( 'clanfront_tourney' );
	} elseif ( $post instanceof WP_Post && 'page' === $post->post_type && 'home' !== $view ) {
		$text = wp_trim_words( wp_strip_all_tags( strip_shortcodes( $post->post_content ) ), 30 );
		$data['title'] = get_the_title( $post ) . ' – ' . $name;
		if ( '' !== $text ) {
			$data['description'] = $text;
		}
		$data['url'] = get_permalink( $post );
	}

	if ( '' === (string) $data['description'] && '' !== (string) $logo ) {
		$data['description'] = $name;
	}
	$data['image']       = clanfront_absolute_url( clanfront_local_url( $data['image'] ) );
	$data['description'] = wp_strip_all_tags( (string) $data['description'] );
	return apply_filters( 'clanfront_share_data', $data );
}

add_action(
	'wp_head',
	function () {
		if ( ! function_exists( 'clanfront_view' ) || ! clanfront_view() ) {
			return;
		}
		$d    = clanfront_share_data();
		$tags = array(
			array( 'property', 'og:site_name', clanfront_name() ),
			array( 'property', 'og:type', $d['type'] ),
			array( 'property', 'og:title', $d['title'] ),
			array( 'property', 'og:description', $d['description'] ),
			array( 'property', 'og:url', $d['url'] ),
			array( 'name', 'twitter:card', $d['image'] ? 'summary_large_image' : 'summary' ),
			array( 'name', 'twitter:title', $d['title'] ),
			array( 'name', 'twitter:description', $d['description'] ),
			array( 'name', 'description', $d['description'] ),
		);
		if ( $d['image'] ) {
			$tags[] = array( 'property', 'og:image', $d['image'] );
			$tags[] = array( 'name', 'twitter:image', $d['image'] );
		}
		foreach ( $tags as $t ) {
			if ( '' === (string) $t[2] ) {
				continue;
			}
			printf( '<meta %1$s="%2$s" content="%3$s">' . "\n", esc_attr( $t[0] ), esc_attr( $t[1] ), esc_attr( $t[2] ) );
		}
	},
	5
);

// Stop offering WordPress's own embed card (the one that shows the author name) on these pages.
add_action(
	'wp',
	function () {
		if ( function_exists( 'clanfront_view' ) && clanfront_view() ) {
			remove_action( 'wp_head', 'wp_oembed_add_discovery_links' );
		}
	}
);

// Never reveal a username through the embed data either.
add_filter(
	'oembed_response_data',
	function ( $data ) {
		unset( $data['author_name'], $data['author_url'] );
		return $data;
	}
);

/* ---------- Author privacy ---------- */

// Author pages (/author/admin/, ?author=1) list a username and use the plain theme. A clan site has no use for them.
add_action(
	'template_redirect',
	function () {
		if ( is_author() ) {
			wp_safe_redirect( home_url( '/' ), 301 );
			exit;
		}
	},
	1
);

// Keep usernames out of the XML sitemap too.
add_filter(
	'wp_sitemaps_add_provider',
	function ( $provider, $name ) {
		return 'users' === $name ? false : $provider;
	},
	10,
	2
);