<?php
/**
 * Multiple public booking forms.
 *
 * Form 0 is the main form: its settings are the plugin settings themselves, so existing
 * shortcodes and blocks keep working unchanged. Additional forms store only the form-scoped
 * settings (content, appearance, customer fields, messages, display) and inherit everything
 * else, such as business rules, payments and the booking type, from the plugin settings.
 *
 * @package Abientot
 * @license GPL-3.0-or-later
 */

namespace Abientot\Support;

use Abientot\Admin\Settings;

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

final class BookingForms {
	public const OPTION = 'abientot_booking_forms';
	public const MAX    = 50;

	/** Settings that belong to one form; everything else is shared by all forms. */
	public static function scoped_keys(): array {
		$keys = array_filter(
			array_keys( Settings::defaults() ),
			static function ( string $key ): bool {
				return 0 === strpos( $key, 'form_' );
			}
		);
		return array_values( array_merge( $keys, array( 'confirmation_message', 'require_policy_checkbox', 'policy_checkbox_text' ) ) );
	}

	/** @return array{next:int,main:string,forms:array<int,array{name:string,settings:array<string,mixed>}>} */
	private static function store(): array {
		$store = get_option( self::OPTION, array() );
		$store = is_array( $store ) ? $store : array();
		$forms = array();
		foreach ( (array) ( $store['forms'] ?? array() ) as $id => $form ) {
			if ( (int) $id > 0 && is_array( $form ) ) {
				$forms[ (int) $id ] = array(
					'name'     => (string) ( $form['name'] ?? '' ),
					'settings' => is_array( $form['settings'] ?? null ) ? $form['settings'] : array(),
				);
			}
		}
		return array(
			'next'  => max( 1, (int) ( $store['next'] ?? 1 ), $forms ? max( array_keys( $forms ) ) + 1 : 1 ),
			'main'  => (string) ( $store['main'] ?? '' ),
			'forms' => $forms,
		);
	}

	private static function put( array $store ): void {
		update_option( self::OPTION, $store, true );
	}

	/** @return array<int,string> Form id => name, main form first. */
	public static function names(): array {
		$store = self::store();
		$names = array( 0 => '' !== $store['main'] ? $store['main'] : __( 'Main form', 'abientot' ) );
		foreach ( $store['forms'] as $id => $form ) {
			/* translators: %d: form number. */
			$names[ $id ] = '' !== $form['name'] ? $form['name'] : sprintf( __( 'Form %d', 'abientot' ), $id );
		}
		return $names;
	}

	public static function exists( int $id ): bool {
		return 0 === $id || isset( self::store()['forms'][ $id ] );
	}

	/** Resolves an untrusted id (shortcode, block, request) to an existing form id. */
	public static function resolve( $id ): int {
		$id = is_numeric( $id ) ? (int) $id : 0;
		return $id > 0 && self::exists( $id ) ? $id : 0;
	}

	/** Effective settings of one form: plugin settings with the form's own values on top. */
	public static function settings( int $id ): array {
		$settings = Settings::values();
		if ( $id > 0 ) {
			$form = self::store()['forms'][ $id ] ?? null;
			if ( $form ) {
				$settings = array_merge( $settings, array_intersect_key( $form['settings'], array_flip( self::scoped_keys() ) ) );
			}
		}
		return $settings;
	}

	/** Creates a form as a copy of another one; returns the new id, or 0 when the limit is reached. */
	public static function create( int $from, string $name ): int {
		$store = self::store();
		if ( count( $store['forms'] ) >= self::MAX ) {
			return 0;
		}
		$id                    = $store['next'];
		$store['forms'][ $id ] = array(
			'name'     => sanitize_text_field( $name ),
			'settings' => array_intersect_key( self::settings( self::resolve( $from ) ), array_flip( self::scoped_keys() ) ),
		);
		$store['next']         = $id + 1;
		self::put( $store );
		return $id;
	}

	/** Stores sanitized settings (and optionally a new name) for an additional form. */
	public static function save( int $id, array $settings, ?string $name = null ): void {
		$store = self::store();
		if ( $id <= 0 || ! isset( $store['forms'][ $id ] ) ) {
			return;
		}
		$store['forms'][ $id ]['settings'] = array_intersect_key( $settings, array_flip( self::scoped_keys() ) );
		if ( null !== $name ) {
			$store['forms'][ $id ]['name'] = sanitize_text_field( $name );
		}
		self::put( $store );
	}

	public static function rename( int $id, string $name ): void {
		$store = self::store();
		if ( 0 === $id ) {
			$store['main'] = sanitize_text_field( $name );
		} elseif ( isset( $store['forms'][ $id ] ) ) {
			$store['forms'][ $id ]['name'] = sanitize_text_field( $name );
		} else {
			return;
		}
		self::put( $store );
	}

	/** The main form cannot be deleted; pages using a deleted form fall back to the main form. */
	public static function delete( int $id ): bool {
		$store = self::store();
		if ( $id <= 0 || ! isset( $store['forms'][ $id ] ) ) {
			return false;
		}
		unset( $store['forms'][ $id ] );
		self::put( $store );
		return true;
	}

	/** Shortcode that displays one form. */
	public static function shortcode( int $id, string $mode = '' ): string {
		$attributes = ( $id > 0 ? ' form="' . $id . '"' : '' ) . ( '' !== $mode ? ' mode="' . $mode . '"' : '' );
		return '[abientot_booking_form' . $attributes . ']';
	}
}