<?php

namespace ChargeForms\Includes\Logic;

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

/** PHP mirror of assets/src/builder/logic/actions/builtins.js — see that file's header comment for the overlay-not-mutation design. */
class Builtin_Actions {

	private static $registered = false;

	public static function register_all() {
		if ( self::$registered ) {
			return;
		}
		self::$registered = true;

		Action_Registry::register( [ 'id' => 'show', 'label' => 'Show', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'visible' => true ] ) ] );
		Action_Registry::register( [ 'id' => 'hide', 'label' => 'Hide', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'visible' => false ] ) ] );
		Action_Registry::register( [ 'id' => 'enable', 'label' => 'Enable', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'enabled' => true ] ) ] );
		Action_Registry::register( [ 'id' => 'disable', 'label' => 'Disable', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'enabled' => false ] ) ] );
		Action_Registry::register( [ 'id' => 'require', 'label' => 'Require', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'required' => true ] ) ] );
		Action_Registry::register( [ 'id' => 'unrequire', 'label' => 'Make optional', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'required' => false ] ) ] );
		Action_Registry::register( [ 'id' => 'readonly', 'label' => 'Make read-only', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'readonly' => true ] ) ] );
		Action_Registry::register( [ 'id' => 'editable', 'label' => 'Make editable', 'apply' => fn( $state, $action ) => self::with_field( $state, $action['target'], [ 'readonly' => false ] ) ] );
	}

	private static function with_field( array $state, $field_id, array $patch ) {
		$current            = $state[ $field_id ] ?? [];
		$state[ $field_id ] = array_merge( $current, $patch );
		return $state;
	}

	/**
	 * Same baseline every consumer (evaluator, a future PHP-side inspector)
	 * starts from — mirrors baseFieldState() in actions/builtins.js,
	 * including the "a field targeted only by 'show' actions starts
	 * hidden" fix documented there. `$fields` is a flat array here
	 * (server-side callers already flatten containers before calling, see
	 * Evaluator::evaluate_rules()).
	 */
	public static function base_field_state( array $fields, array $rules = [] ) {
		$starts_hidden   = [];
		$has_hide_action = [];
		foreach ( $rules as $rule ) {
			if ( false === ( $rule['enabled'] ?? true ) ) {
				continue;
			}
			foreach ( $rule['actions'] ?? [] as $action ) {
				if ( 'show' === ( $action['type'] ?? null ) ) {
					$starts_hidden[ $action['target'] ] = true;
				}
				if ( 'hide' === ( $action['type'] ?? null ) ) {
					$has_hide_action[ $action['target'] ] = true;
				}
			}
		}
		foreach ( $has_hide_action as $field_id => $_ ) {
			unset( $starts_hidden[ $field_id ] );
		}

		$state = [];
		foreach ( $fields as $field ) {
			$state[ $field['id'] ] = [
				'visible'  => empty( $starts_hidden[ $field['id'] ] ),
				'enabled'  => true,
				'required' => ! empty( $field['required'] ),
				'readonly' => false,
			];
		}
		return $state;
	}
}