<?php
namespace Mapfield_Spots;

defined( 'ABSPATH' ) || exit;

/**
 * Location_Field
 *
 * "Location" meta box: draggable-marker map + address search against the
 * Mapbox Search Box API — not the mapbox-gl-geocoder library (targets
 * legacy Geocoding v5) or plain Geocoding v6 alone (no POI/business
 * results). Search Box also prefills phone/website (selectSuggestion() in
 * location-picker.js). Dragging/clicking the map reverse-geocodes via
 * plain Geocoding v6, plus editable lat/lng inputs.
 *
 * No separate "confirm location" step — saving the position is just the
 * normal Update/Publish click. A prior confirm/pulse mechanism was removed
 * as confusing. location-picker.js still warns on navigating away with an
 * unsaved position, since core's own unsaved-changes prompt only tracks
 * title/content/excerpt, not meta box fields.
 *
 * Storage: three individual post meta keys (queryable via meta_query for a
 * future proximity search), not one serialized blob.
 *   _mapfield_spots_lat/_lng (float), _mapfield_spots_address (string)
 */
class Location_Field {

	const NONCE_ACTION = 'mapfield_spots_save_location';
	const NONCE_NAME   = 'mapfield_spots_location_nonce';

	public function __construct() {
		add_action( 'init', array( $this, 'register_meta' ), 20 );
		add_action( 'add_meta_boxes', array( $this, 'add_meta_box' ) );
		add_action( 'save_post', array( $this, 'save' ) );
		add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_assets' ) );
		add_action( 'admin_notices', array( $this, 'render_no_location_notice' ) );
	}

	private function managed_post_types(): array {
		$types = array();
		foreach ( Map_Types::get_all() as $slug => $config ) {
			$types[] = CPT::post_type_slug( $slug );
		}
		return $types;
	}

	// ── REST/meta registration ──────────────────────────────────────────

	public function register_meta(): void {
		foreach ( $this->managed_post_types() as $post_type ) {
			register_post_meta( $post_type, '_mapfield_spots_lat', array(
				'type'              => 'number',
				'single'            => true,
				'show_in_rest'      => true,
				'sanitize_callback' => function ( $v ) { return is_numeric( $v ) ? (float) $v : ''; },
				'auth_callback'     => function () { return current_user_can( 'edit_posts' ); },
			) );
			register_post_meta( $post_type, '_mapfield_spots_lng', array(
				'type'              => 'number',
				'single'            => true,
				'show_in_rest'      => true,
				'sanitize_callback' => function ( $v ) { return is_numeric( $v ) ? (float) $v : ''; },
				'auth_callback'     => function () { return current_user_can( 'edit_posts' ); },
			) );
			register_post_meta( $post_type, '_mapfield_spots_address', array(
				'type'              => 'string',
				'single'            => true,
				'show_in_rest'      => true,
				'sanitize_callback' => 'sanitize_text_field',
				'auth_callback'     => function () { return current_user_can( 'edit_posts' ); },
			) );
			register_post_meta( $post_type, '_mapfield_spots_placement_mode', array(
				'type'              => 'string',
				'single'            => true,
				'show_in_rest'      => true,
				'sanitize_callback' => function ( $v ) { return 'click' === $v ? 'click' : 'manual'; },
				'auth_callback'     => function () { return current_user_can( 'edit_posts' ); },
			) );
		}
	}

	// ── Meta box ─────────────────────────────────────────────────────────

	public function add_meta_box(): void {
		foreach ( $this->managed_post_types() as $post_type ) {
			add_meta_box(
				'mfs-location',
				__( 'Location', 'mapfield-spots' ),
				array( $this, 'render' ),
				$post_type,
				'normal',
				'high'
			);
		}
	}

	public function render( \WP_Post $post ): void {
		wp_nonce_field( self::NONCE_ACTION, self::NONCE_NAME );

		$lat     = get_post_meta( $post->ID, '_mapfield_spots_lat', true );
		$lng     = get_post_meta( $post->ID, '_mapfield_spots_lng', true );
		$address = get_post_meta( $post->ID, '_mapfield_spots_address', true );
		$mode    = get_post_meta( $post->ID, '_mapfield_spots_placement_mode', true ) ?: 'manual';
		?>
		<div class="mapfield_spots-location-field" id="mapfield_spots-location-field"
			data-lat="<?php echo esc_attr( $lat ); ?>"
			data-lng="<?php echo esc_attr( $lng ); ?>">

			<?php if ( ! $lat || ! $lng ) : ?>
				<?php // Loose falsy check: also catches legacy '0'/0.0 values, not just untouched fields. Removed client-side once a real position is set. ?>
				<div class="notice notice-warning inline mapfield_spots-location-field__warning">
					<p><?php esc_html_e( "No location set yet — this Spot won't appear on the map until you search an address, or click the map below.", 'mapfield-spots' ); ?></p>
				</div>
			<?php endif; ?>

			<p class="description"><?php esc_html_e( 'Type an address to search for it on the map below.', 'mapfield-spots' ); ?></p>
			<div id="mapfield_spots-address-search" class="mapfield_spots-location-field__search"></div>

			<fieldset class="mapfield_spots-location-field__mode">
				<label>
					<input type="radio" name="mapfield_spots-placement-mode" value="manual" <?php checked( $mode, 'manual' ); ?> />
					<?php esc_html_e( 'Drag or search', 'mapfield-spots' ); ?>
				</label>
				<label>
					<input type="radio" name="mapfield_spots-placement-mode" value="click" <?php checked( $mode, 'click' ); ?> />
					<?php esc_html_e( 'Click on map', 'mapfield-spots' ); ?>
				</label>
			</fieldset>

			<div id="mapfield_spots-location-map" class="mapfield_spots-location-field__map"></div>

			<div class="mapfield_spots-location-field__coords">
				<label>
					<?php esc_html_e( 'Latitude', 'mapfield-spots' ); ?>
					<input type="text" inputmode="decimal" id="mapfield_spots-lat" name="mapfield_spots_lat" value="<?php echo esc_attr( $lat ); ?>" />
				</label>
				<label>
					<?php esc_html_e( 'Longitude', 'mapfield-spots' ); ?>
					<input type="text" inputmode="decimal" id="mapfield_spots-lng" name="mapfield_spots_lng" value="<?php echo esc_attr( $lng ); ?>" />
				</label>
			</div>

			<input type="hidden" id="mapfield_spots-address" name="mapfield_spots_address" value="<?php echo esc_attr( $address ); ?>" />

			<div id="mapfield_spots-map-error" class="mapfield_spots-map-error" hidden></div>
		</div>
		<?php
	}

	// ── Save ────────────────────────────────────────────────────────────

	public function save( int $post_id ): void {
		$nonce = isset( $_POST[ self::NONCE_NAME ] ) ? sanitize_text_field( wp_unslash( $_POST[ self::NONCE_NAME ] ) ) : '';
		if ( ! wp_verify_nonce( $nonce, self::NONCE_ACTION ) ) {
			return;
		}
		if ( ! in_array( get_post_type( $post_id ), $this->managed_post_types(), true ) ) {
			return;
		}
		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return;
		}
		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}

		// Blank stays '' rather than (float) '' === 0.0 — used to silently
		// save an untouched Spot as a real 0,0 (Atlantic), indistinguishable
		// from an intentional value. render_map() already skips falsy lat/lng.
		$lat_raw = isset( $_POST['mapfield_spots_lat'] ) ? sanitize_text_field( wp_unslash( $_POST['mapfield_spots_lat'] ) ) : '';
		$lng_raw = isset( $_POST['mapfield_spots_lng'] ) ? sanitize_text_field( wp_unslash( $_POST['mapfield_spots_lng'] ) ) : '';
		$lat     = '' !== $lat_raw ? (float) str_replace( ',', '.', $lat_raw ) : '';
		$lng     = '' !== $lng_raw ? (float) str_replace( ',', '.', $lng_raw ) : '';

		update_post_meta( $post_id, '_mapfield_spots_lat', $lat );
		update_post_meta( $post_id, '_mapfield_spots_lng', $lng );
		update_post_meta( $post_id, '_mapfield_spots_address', sanitize_text_field( wp_unslash( $_POST['mapfield_spots_address'] ?? '' ) ) );
		$placement_mode = isset( $_POST['mapfield_spots-placement-mode'] ) ? sanitize_text_field( wp_unslash( $_POST['mapfield_spots-placement-mode'] ) ) : '';
		update_post_meta( $post_id, '_mapfield_spots_placement_mode', 'click' === $placement_mode ? 'click' : 'manual' );

		// save_post fires before the redirect, too early to print a notice —
		// flag it via a query arg instead, same mechanism core uses itself.
		if ( ! $lat || ! $lng ) {
			add_filter( 'redirect_post_location', array( $this, 'flag_no_location_in_redirect' ) );
		}
	}

	public function flag_no_location_in_redirect( string $location ): string {
		return add_query_arg( 'mapfield_spots_no_location', '1', $location );
	}

	// Post-save counterpart to render()'s inline warning — repeats it as a
	// dismissible notice right after Publish/Update, easy to miss otherwise.
	public function render_no_location_notice(): void {
		$screen = get_current_screen();
		if ( ! $screen || ! in_array( $screen->post_type, $this->managed_post_types(), true ) ) {
			return;
		}
		if ( '1' !== sanitize_text_field( wp_unslash( $_GET['mapfield_spots_no_location'] ?? '' ) ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- read-only display flag off core's own redirect query arg, nothing acted on.
			return;
		}
		?>
		<div class="notice notice-warning is-dismissible">
			<p><?php esc_html_e( "This Spot was saved without a location — it won't appear on the map until you set one.", 'mapfield-spots' ); ?></p>
		</div>
		<?php
	}

	// ── Assets ──────────────────────────────────────────────────────────

	public function enqueue_assets( string $hook ): void {
		if ( ! in_array( $hook, array( 'post.php', 'post-new.php' ), true ) ) {
			return;
		}
		$screen = get_current_screen();
		if ( ! $screen || ! in_array( $screen->post_type, $this->managed_post_types(), true ) ) {
			return;
		}

		// MapLibre GL JS, bundled locally — no CDN. Address search/reverse-geocoding
		// call Mapbox Search Box/Geocoding directly via fetch() in location-picker.js.
		wp_enqueue_style( 'maplibre-gl', MAPFIELD_SPOTS_URL . 'assets/vendor/maplibre-gl/maplibre-gl.css', array(), '4.7.1' );
		wp_enqueue_script( 'maplibre-gl', MAPFIELD_SPOTS_URL . 'assets/vendor/maplibre-gl/maplibre-gl.js', array(), '4.7.1', true );

		wp_enqueue_style( 'mapfield-spots-admin', MAPFIELD_SPOTS_URL . 'assets/admin.css', array( 'mapfield-spots-palette' ), MAPFIELD_SPOTS_VERSION );
		wp_enqueue_script( 'mapfield-spots-admin', MAPFIELD_SPOTS_URL . 'assets/admin.js', array(), MAPFIELD_SPOTS_VERSION, true );
		wp_enqueue_script( 'mapfield-spots-mapbox-style-loader', MAPFIELD_SPOTS_URL . 'assets/mapbox-style-loader.js', array(), MAPFIELD_SPOTS_VERSION, true );
		wp_enqueue_script( 'mapfield-spots-location', MAPFIELD_SPOTS_URL . 'assets/location-picker.js', array( 'maplibre-gl', 'mapfield-spots-mapbox-style-loader' ), MAPFIELD_SPOTS_VERSION, true );
		wp_enqueue_style( 'pimp-scrollbar', MAPFIELD_SPOTS_URL . 'assets/pimp-scrollbar.css', array(), MAPFIELD_SPOTS_VERSION );
		wp_enqueue_script( 'pimp-scrollbar', MAPFIELD_SPOTS_URL . 'assets/pimp-scrollbar.js', array(), MAPFIELD_SPOTS_VERSION, true );

		$map_type = Map_Types::get_by_post_type( $screen->post_type ) ?? Map_Types::default_config();
		$settings = Settings::get_mapbox_settings();

		wp_localize_script( 'mapfield-spots-location', 'MapfieldSpots', array(
			'token'     => $settings['token'],
			'style'     => $map_type['map']['style_url'] ?: $settings['style_url'],
			'center'    => array( $map_type['map']['center'][1], $map_type['map']['center'][0] ), // [lng, lat]
			'proximity' => array( $map_type['map']['center'][1], $map_type['map']['center'][0] ),
			'zoom'      => $map_type['map']['zoom'],
			'markerSvg' => Marker_Library::resolve( $map_type['map'] )['markup'],
			'i18n'      => array(
				'noToken'           => __( 'No Mapbox token configured. Set one under Mapfield Spots → Settings.', 'mapfield-spots' ),
				'searchPlaceholder' => __( 'Search for an address…', 'mapfield-spots' ),
				'mapError'          => __( 'Could not display the map:', 'mapfield-spots' ),
				'unsavedWarning'    => __( 'This location has an unsaved position change.', 'mapfield-spots' ),
			),
		) );
	}
}