<?php
/**
 * Stores Multi-step Form entries as a private CPT (`reactwoo_atomic_form`), listed under Tools in wp-admin.
 * Entry meta uses `_reactwoo_atomic_*`.
 *
 * @package ReactWoo\Atomic
 */

namespace ReactWoo\Atomic\Forms;

defined( 'ABSPATH' ) || exit;

final class Submission_Store {

	const POST_TYPE   = 'reactwoo_atomic_form';
	const META_PREFIX = '_reactwoo_atomic_';

	public static function init() {
		add_action( 'init', array( __CLASS__, 'register_post_type' ) );
		add_filter( 'wp_privacy_personal_data_erasers', array( __CLASS__, 'register_eraser' ) );
		add_filter( 'wp_privacy_personal_data_exporters', array( __CLASS__, 'register_exporter' ) );
	}

	public static function register_post_type() {
		register_post_type(
			self::POST_TYPE,
			array(
				'labels'          => array(
					'name'          => __( 'Form entries', 'reactwoo-atomic' ),
					'singular_name' => __( 'Form entry', 'reactwoo-atomic' ),
				),
				'public'          => false,
				'show_ui'         => true,
				'show_in_menu'    => 'tools.php',
				'show_in_rest'    => false,
				'supports'        => array( 'title' ),
				'capability_type' => 'post',
				'capabilities'    => array( 'create_posts' => 'do_not_allow' ),
				'map_meta_cap'    => true,
			)
		);
	}

	/**
	 * @param array $entry {form_id, form_name, page_id, path, answers, labels, tracking, geo, ip_hash, ua_hash, email}.
	 * @return int Entry id (0 on failure).
	 */
	public static function insert( array $entry ) {
		$title = sprintf( '%s — %s', isset( $entry['form_name'] ) ? $entry['form_name'] : '', wp_date( 'Y-m-d H:i' ) );
		$id    = wp_insert_post(
			array(
				'post_type'   => self::POST_TYPE,
				'post_status' => 'private',
				'post_title'  => sanitize_text_field( $title ),
			),
			true
		);
		if ( is_wp_error( $id ) || ! $id ) {
			return 0;
		}
		foreach ( array( 'form_id', 'page_id', 'path', 'answers', 'labels', 'tracking', 'geo', 'ip_hash', 'ua_hash', 'email', 'tags' ) as $k ) {
			if ( isset( $entry[ $k ] ) ) {
				update_post_meta( $id, self::META_PREFIX . $k, $entry[ $k ] );
			}
		}
		return (int) $id;
	}

	/**
	 * @param int $entry_id Entry id.
	 * @return array|null
	 */
	public static function get( $entry_id ) {
		$post = get_post( (int) $entry_id );
		if ( ! $post || self::POST_TYPE !== $post->post_type ) {
			return null;
		}
		$out = array( 'id' => (int) $post->ID );
		foreach ( array( 'form_id', 'page_id', 'path', 'answers', 'labels', 'tracking', 'geo', 'email', 'tags' ) as $k ) {
			$out[ $k ] = self::read_meta( $post->ID, $k );
		}
		return $out;
	}

	public static function register_eraser( $erasers ) {
		$erasers['reactwoo-atomic-forms'] = array(
			'eraser_friendly_name' => __( 'ReactWoo form entries', 'reactwoo-atomic' ),
			'callback'             => array( __CLASS__, 'erase' ),
		);
		return $erasers;
	}

	public static function register_exporter( $exporters ) {
		$exporters['reactwoo-atomic-forms'] = array(
			'exporter_friendly_name' => __( 'ReactWoo form entries', 'reactwoo-atomic' ),
			'callback'               => array( __CLASS__, 'export' ),
		);
		return $exporters;
	}

	private static function ids_for_email( $email ) {
		$email = strtolower( (string) $email );
		return self::ids_for_meta( self::META_PREFIX . 'email', $email );
	}

	/**
	 * @param string $meta_key Meta key.
	 * @param string $email    Email.
	 * @return array<int, int>
	 */
	private static function ids_for_meta( $meta_key, $email ) {
		return get_posts(
			array(
				'post_type'      => self::POST_TYPE,
				'post_status'    => 'any',
				'fields'         => 'ids',
				'posts_per_page' => 100,
				'meta_key'       => $meta_key, // phpcs:ignore WordPress.DB.SlowDBQuery
				'meta_value'     => $email, // phpcs:ignore WordPress.DB.SlowDBQuery
			)
		);
	}

	/**
	 * @param int    $post_id Post id.
	 * @param string $key     Meta suffix.
	 * @return mixed
	 */
	private static function read_meta( $post_id, $key ) {
		return get_post_meta( $post_id, self::META_PREFIX . $key, true );
	}

	public static function erase( $email, $page = 1 ) {
		$ids = self::ids_for_email( $email );
		foreach ( $ids as $id ) {
			wp_delete_post( $id, true );
		}
		return array( 'items_removed' => count( $ids ), 'items_retained' => false, 'messages' => array(), 'done' => count( $ids ) < 100 );
	}

	public static function export( $email, $page = 1 ) {
		$data = array();
		foreach ( self::ids_for_email( $email ) as $id ) {
			$labels = (array) self::read_meta( $id, 'labels' );
			$items  = array();
			foreach ( $labels as $k => $v ) {
				$items[] = array( 'name' => (string) $k, 'value' => is_scalar( $v ) ? (string) $v : wp_json_encode( $v ) );
			}
			$data[] = array( 'group_id' => 'rwa-form-entries', 'group_label' => __( 'Form entries', 'reactwoo-atomic' ), 'item_id' => 'rwa-entry-' . $id, 'data' => $items );
		}
		return array( 'data' => $data, 'done' => true );
	}
}