WP-LIT-MCP/src/Dependencies.php

<?php

declare(strict_types=1);

namespace LIT\MCP;

/**
 * Checks that the libraries WP-LIT-MCP builds on are loadable.
 */
final class Dependencies
{
    private const REQUIRED = [
        'wordpress/mcp-adapter' => 'WP\\MCP\\Core\\McpAdapter',
        'wp-media/mcp-oauth' => 'WPMedia\\MCP\\OAuth\\Bootstrap',
        'WordPress Abilities API' => 'WP_Ability',
    ];

    /** @var callable(string): bool */
    private $classExists;

    public function __construct(?callable $classExists = null)
    {
        $this->classExists = $classExists ?? static fn (string $class): bool => class_exists($class);
    }

    /**
     * @return list<string> Human-readable names of missing components.
     */
    public function missing(): array
    {
        $missing = [];
        foreach (self::REQUIRED as $name => $class) {
            if (! ($this->classExists)($class)) {
                $missing[] = $name;
            }
        }

        return $missing;
    }
}