<?php
namespace Mapfield_Spots;

defined( 'ABSPATH' ) || exit;

/**
 * Hours_Field
 *
 * "Opening hours" meta box. Each day gets a "Closed" toggle plus any number
 * of time slots (e.g. lunch-break split), not just one open/close pair.
 *
 * Storage: _mapfield_spots_hours, array keyed mon..sun, each entry:
 *   [ 'closed' => bool, 'ranges' => [ [ 'open' => 'HH:MM', 'close' => 'HH:MM' ], ... ] ]
 */
class Hours_Field {

	const NONCE_ACTION = 'mapfield_spots_save_hours';
	const NONCE_NAME   = 'mapfield_spots_hours_nonce';

	public static function days(): array {
		return array(
			'mon' => __( 'Monday', 'mapfield-spots' ),
			'tue' => __( 'Tuesday', 'mapfield-spots' ),
			'wed' => __( 'Wednesday', 'mapfield-spots' ),
			'thu' => __( 'Thursday', 'mapfield-spots' ),
			'fri' => __( 'Friday', 'mapfield-spots' ),
			'sat' => __( 'Saturday', 'mapfield-spots' ),
			'sun' => __( 'Sunday', 'mapfield-spots' ),
		);
	}

	// Explicit translatable strings, not substr()'d from the full name —
	// abbreviation isn't a simple truncation in every language.
	public static function days_short(): array {
		return array(
			'mon' => _x( 'Mon', 'day abbreviation', 'mapfield-spots' ),
			'tue' => _x( 'Tue', 'day abbreviation', 'mapfield-spots' ),
			'wed' => _x( 'Wed', 'day abbreviation', 'mapfield-spots' ),
			'thu' => _x( 'Thu', 'day abbreviation', 'mapfield-spots' ),
			'fri' => _x( 'Fri', 'day abbreviation', 'mapfield-spots' ),
			'sat' => _x( 'Sat', 'day abbreviation', 'mapfield-spots' ),
			'sun' => _x( 'Sun', 'day abbreviation', 'mapfield-spots' ),
		);
	}

	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' ) );
	}

	private function managed_post_types_with_hours(): array {
		$types = array();
		foreach ( Map_Types::get_all() as $slug => $config ) {
			if ( ! empty( $config['fields']['hours'] ) ) {
				$types[] = CPT::post_type_slug( $slug );
			}
		}
		return $types;
	}

	public function register_meta(): void {
		foreach ( Map_Types::get_all() as $slug => $config ) {
			register_post_meta( CPT::post_type_slug( $slug ), '_mapfield_spots_hours', array(
				'type'              => 'object',
				'single'            => true,
				'show_in_rest'      => false, // nested shape not worth a REST schema yet
				'sanitize_callback' => array( self::class, 'sanitize_hours' ),
				'auth_callback'     => function () { return current_user_can( 'edit_posts' ); },
			) );
		}
	}

	public static function sanitize_time( string $value ): string {
		return preg_match( '/^([01]\d|2[0-3]):[0-5]\d$/', $value ) ? $value : '';
	}

	public static function sanitize_hours( $value ): array {
		$clean = array();
		foreach ( array_keys( self::days() ) as $day ) {
			$entry  = ( is_array( $value ) && isset( $value[ $day ] ) && is_array( $value[ $day ] ) ) ? $value[ $day ] : array();
			$ranges = array();
			if ( ! empty( $entry['ranges'] ) && is_array( $entry['ranges'] ) ) {
				foreach ( $entry['ranges'] as $range ) {
					$open  = self::sanitize_time( is_array( $range ) ? (string) ( $range['open'] ?? '' ) : '' );
					$close = self::sanitize_time( is_array( $range ) ? (string) ( $range['close'] ?? '' ) : '' );
					if ( $open && $close ) {
						$ranges[] = array( 'open' => $open, 'close' => $close );
					}
				}
			}
			$clean[ $day ] = array(
				'closed' => ! empty( $entry['closed'] ),
				'ranges' => $ranges,
			);
		}
		return $clean;
	}

	// True once any day is set (closed or has a range) — keeps an untouched
	// field from rendering as a false "Mon–Sun: Closed" block on the front end.
	public static function has_any_data( array $hours ): bool {
		foreach ( $hours as $entry ) {
			if ( ! empty( $entry['closed'] ) || ! empty( $entry['ranges'] ) ) {
				return true;
			}
		}
		return false;
	}

	/**
	 * Collapses consecutive days sharing the same hours (e.g. "Mon–Fri: 09:00–18:00").
	 * Each group: [ 'label' => 'Mon–Fri', 'text' => '09:00–18:00', 'is_today' => bool ]
	 */
	public static function grouped_for_display( array $hours ): array {
		$days       = self::days_short();
		$day_keys   = array_keys( $days );
		$today_key  = $day_keys[ (int) current_time( 'N' ) - 1 ] ?? '';
		$groups     = array();
		$current    = null;

		foreach ( $day_keys as $day ) {
			$entry = $hours[ $day ] ?? array( 'closed' => true, 'ranges' => array() );
			if ( $entry['closed'] || ! $entry['ranges'] ) {
				$text = __( 'Closed', 'mapfield-spots' );
			} else {
				$parts = array();
				foreach ( $entry['ranges'] as $range ) {
					$parts[] = $range['open'] . '–' . $range['close'];
				}
				$text = implode( ', ', $parts );
			}

			if ( $current && $current['text'] === $text ) {
				$current['end']      = $day;
				$current['is_today'] = $current['is_today'] || ( $day === $today_key );
			} else {
				if ( $current ) {
					$groups[] = $current;
				}
				$current = array( 'start' => $day, 'end' => $day, 'text' => $text, 'is_today' => ( $day === $today_key ) );
			}
		}
		if ( $current ) {
			$groups[] = $current;
		}

		return array_map( function ( $group ) use ( $days ) {
			$label = $group['start'] === $group['end']
				? $days[ $group['start'] ]
				: $days[ $group['start'] ] . '–' . $days[ $group['end'] ];
			return array( 'label' => $label, 'text' => $group['text'], 'is_today' => $group['is_today'] );
		}, $groups );
	}

	public function add_meta_box(): void {
		foreach ( Map_Types::get_all() as $slug => $config ) {
			if ( empty( $config['fields']['hours'] ) ) {
				continue;
			}
			// 'normal': admin.css pins this full-width (7-day table doesn't fit a half column).
			add_meta_box(
				'mfs-hours',
				__( 'Opening hours', 'mapfield-spots' ),
				array( $this, 'render' ),
				CPT::post_type_slug( $slug ),
				'normal',
				'default'
			);
		}
	}

	public function render( \WP_Post $post ): void {
		wp_nonce_field( self::NONCE_ACTION, self::NONCE_NAME );
		$hours = self::sanitize_hours( get_post_meta( $post->ID, '_mapfield_spots_hours', true ) );
		?>
		<div class="mapfield_spots-hours-list">
			<?php foreach ( self::days() as $day => $label ) :
				$entry  = $hours[ $day ];
				$ranges = $entry['ranges'] ?: array( array( 'open' => '', 'close' => '' ) );
				?>
				<div class="mapfield_spots-hours-row<?php echo $entry['closed'] ? ' is-closed' : ''; ?>" data-day="<?php echo esc_attr( $day ); ?>">
					<div class="mapfield_spots-hours-day">
						<span class="mapfield_spots-hours-day-label"><?php echo esc_html( $label ); ?></span>
						<label class="mapfield_spots-hours-closed">
							<input type="checkbox" class="mapfield_spots-hours-closed-input" name="mapfield_spots_hours[<?php echo esc_attr( $day ); ?>][closed]" value="1" <?php checked( $entry['closed'] ); ?> />
							<?php esc_html_e( 'Closed', 'mapfield-spots' ); ?>
						</label>
					</div>
					<div class="mapfield_spots-hours-slots">
						<div class="mapfield_spots-hours-ranges">
							<?php foreach ( $ranges as $i => $range ) : ?>
								<div class="mapfield_spots-hours-range">
									<input type="time" name="mapfield_spots_hours[<?php echo esc_attr( $day ); ?>][ranges][<?php echo (int) $i; ?>][open]" value="<?php echo esc_attr( $range['open'] ); ?>" <?php disabled( $entry['closed'] ); ?> />
									<span>–</span>
									<input type="time" name="mapfield_spots_hours[<?php echo esc_attr( $day ); ?>][ranges][<?php echo (int) $i; ?>][close]" value="<?php echo esc_attr( $range['close'] ); ?>" <?php disabled( $entry['closed'] ); ?> />
									<button type="button" class="mapfield_spots-hours-remove" aria-label="<?php esc_attr_e( 'Remove time slot', 'mapfield-spots' ); ?>">&times;</button>
								</div>
							<?php endforeach; ?>
						</div>
						<button type="button" class="mapfield_spots-hours-add" <?php disabled( $entry['closed'] ); ?>><?php esc_html_e( '+ Add a time slot', 'mapfield-spots' ); ?></button>
					</div>
				</div>
			<?php endforeach; ?>
		</div>
		<?php
	}

	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 ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return;
		}
		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}
		if ( ! isset( $_POST['mapfield_spots_hours'] ) ) {
			return;
		}
		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash, WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- sanitize_hours() sanitizes every leaf value; analyzer can't trace through it.
		$hours = self::sanitize_hours( wp_unslash( $_POST['mapfield_spots_hours'] ) );
		update_post_meta( $post_id, '_mapfield_spots_hours', $hours );
	}

	// ── 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_with_hours(), true ) ) {
			return;
		}
		wp_enqueue_style( 'mapfield-spots-admin', MAPFIELD_SPOTS_URL . 'assets/admin.css', array( 'mapfield-spots-palette' ), MAPFIELD_SPOTS_VERSION );
		wp_enqueue_script( 'mapfield-spots-hours-field', MAPFIELD_SPOTS_URL . 'assets/hours-field.js', array(), MAPFIELD_SPOTS_VERSION, true );
		wp_localize_script( 'mapfield-spots-hours-field', 'MapfieldSpotsHours', array(
			'remove' => __( 'Remove time slot', 'mapfield-spots' ),
		) );
	}
}