<?php

namespace WooOrderCart\Modules;

/**
 * Registry for React admin modules loaded per WP screen.
 */
class ModuleRegistry {
    private static ?self $instance = null;

    /** @var array<string,ModuleDefinition> */
    private array $modules = [];

    public static function instance(): self {
        return self::$instance ??= new self();
    }

    public function register( ModuleDefinition $module ): void {
        $this->modules[ $module->slug ] = $module;
    }

    /**
     * @return ModuleDefinition[]
     */
    public function all(): array {
        return array_values( $this->modules );
    }

    public function get( string $slug ): ?ModuleDefinition {
        return $this->modules[ $slug ] ?? null;
    }

    public function update_screen_id( string $slug, string $screen_id ): void {
        if ( isset( $this->modules[ $slug ] ) ) {
            $this->modules[ $slug ]->screen_id = $screen_id;
        }
    }

    /**
     * @return ModuleDefinition[]
     */
    public function for_screen( string $screen_id ): array {
        return array_values(
            array_filter(
                $this->modules,
                static fn ( ModuleDefinition $module ): bool => $module->screen_id === $screen_id
            )
        );
    }
}