<?php

function gtm_register_custom_fields( $slug, $args ) {
	GTM_Custom_Fields::getInstance()->register_fields( $slug, $args );
}

add_filter( 'gtm_config', 'gtm_add_custom_fields_config' );
function gtm_add_custom_fields_config( $config ) {

	$fields = GTM_Custom_Fields::getInstance()->get_fields();

	if ( ! empty( $fields ) ) {
		$config['custom_fields'] = $fields;
	}

	return $config;
}

if ( ! class_exists( 'GTM_Custom_Fields' ) ) {
	class GTM_Custom_Fields {
		private static $instance;
		private $fields = [];

		public static function getInstance() {
			if ( is_null( static::$instance ) ) {
				static::$instance = new self();
			}

			return static::$instance;
		}

		public function register_fields( $slug, $args ) {
			$slug = sanitize_key( $slug );
			$args = wp_parse_args( $args, [
				'title'       => '',
				'description' => '',
				'post_type'   => 'post', // Use empty value for all post types
				'fields'      => [],
			] );

			// Store the fields
			$this->fields[$slug] = $this->sanitize_fields( $args );

			// Register post meta
			foreach ( $args['fields'] as $fieldSlug => $field ) {
				$restType = 'string';

				register_post_meta( $args['post_type'], $fieldSlug, [
					'show_in_rest' => true,
					'single'       => true,
					'type'         => $restType,
				] );
			}
		}

		/* Enfore structure and sanitize values */
		private function sanitize_fields( $args ) {
			$args['title']       = sanitize_text_field( $args['title'] );
			$args['description'] = sanitize_text_field( $args['description'] );
			$args['post_type']   = sanitize_text_field( $args['post_type'] );

			foreach ( $args['fields'] as $fieldSlug => $field ) {
				$args['fields'][$fieldSlug]['type']        = sanitize_key( $args['fields'][$fieldSlug]['type'] ?? '' );
				$args['fields'][$fieldSlug]['title']       = sanitize_text_field( $args['fields'][$fieldSlug]['title'] ?? '' );
				$args['fields'][$fieldSlug]['description'] = sanitize_text_field( $args['fields'][$fieldSlug]['description'] ?? '' );
			}

			return $args;
		}

		public function get_fields() {
			return $this->fields;
		}
	}
}

function gtm_has_custom_field_set( $slug, $post_id = null ) {
	$post_id = $post_id ?: get_the_ID();

	$fields = GTM_Custom_Fields::getInstance()->get_fields();
	$has    = false;

	if ( ! empty( $fields[$slug]['fields'] ) ) {
		foreach ( $fields[$slug]['fields'] as $field_slug => $field ) {
			$post_meta = get_post_meta( $post_id, $field_slug, true );
			$has |= ! empty( $post_meta );
		}
	}

	return $has;
}

/*
Custom field preset: Recipe summary
 */

add_action( 'init', 'gtm_register_recipe_custom_fields', 11 );
function gtm_register_recipe_custom_fields() {
	if ( get_theme_support( 'gutenmate-recipe-summary' ) ) {
		gtm_register_custom_fields( 'gtm_recipe_summary', [
			'title'       => esc_html__( 'Recipe summary', 'gutenmate' ),
			'description' => esc_html__( 'Enter an additional summary for recipe post. These fields will be shown with post if the selected post layout is supported.', 'gutenmate' ),
			'post_type'   => 'post',
			'fields'      => [
				'gtm_recipe_cook_time'    => [
					'title'       => esc_html__( 'Cook time', 'gutenmate' ),
					'description' => esc_html__( 'Enter time for cooking. Example, 10 mins.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_recipe_serving_size' => [
					'title'       => esc_html__( 'Serves', 'gutenmate' ),
					'description' => esc_html__( 'Enter serving size. Example, 4-6.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_recipe_skill_level'  => [
					'title'       => esc_html__( 'Skill level', 'gutenmate' ),
					'description' => esc_html__( 'Enter skill level for this recipe. Example, Easy, Medium, Hard.', 'gutenmate' ),
					'type'        => 'text',
				],
			],
		] );
	}
}

/*
Custom field preset: Place summary
 */

add_action( 'init', 'gtm_register_place_custom_fields', 11 );
function gtm_register_place_custom_fields() {
	if ( get_theme_support( 'gutenmate-place-summary' ) ) {
		gtm_register_custom_fields( 'gtm_place_summary', [
			'title'       => esc_html__( 'Place summary', 'gutenmate' ),
			'description' => esc_html__( 'Enter an additional summary for place post. These fields will be shown with post if the selected post layout is supported.', 'gutenmate' ),
			'post_type'   => 'post',
			'fields'      => [
				'gtm_place_location' => [
					'title'       => esc_html__( 'Location', 'gutenmate' ),
					'description' => esc_html__( 'Enter location for the place.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_place_price'    => [
					'title'       => esc_html__( 'Price', 'gutenmate' ),
					'description' => esc_html__( 'Enter price for the place.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_place_rating'   => [
					'title'       => esc_html__( 'Rating', 'gutenmate' ),
					'description' => esc_html__( 'Enter place rating.', 'gutenmate' ),
					'type'        => 'text',
				],
			],
		] );
	}
}

/*
Custom field preset: Event summary
 */

add_action( 'init', 'gtm_register_event_custom_fields', 11 );
function gtm_register_event_custom_fields() {
	if ( get_theme_support( 'gutenmate-event-summary' ) ) {
		gtm_register_custom_fields( 'gtm_event_summary', [
			'title'       => esc_html__( 'Event summary', 'gutenmate' ),
			'description' => esc_html__( 'Enter an additional summary for event post. These fields will be shown with post if the selected post layout is supported.', 'gutenmate' ),
			'post_type'   => 'post',
			'fields'      => [
				'gtm_event_location' => [
					'title'       => esc_html__( 'Location', 'gutenmate' ),
					'description' => esc_html__( 'Enter location for the event.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_event_date' => [
					'title'       => esc_html__( 'Date', 'gutenmate' ),
					'description' => esc_html__( 'Enter date for the event.', 'gutenmate' ),
					'type'        => 'text',
				],
				'gtm_event_price'    => [
					'title'       => esc_html__( 'Price', 'gutenmate' ),
					'description' => esc_html__( 'Enter price for the event.', 'gutenmate' ),
					'type'        => 'text',
				],
			],
		] );
	}
}