<?php

namespace jrosset\CliProgram;

use ReflectionClass;
use Symfony\Component\Console\Command\Command;

/**
 * A manager of commands auto prefix base on class namespace
 */
class AutoPrefixNamespaceManager implements IAutoPrefixManager {
    /**
     * @var string The base namespace
     */
    private string $namespace;
    /**
     * @var string|null The initial prefix, Null if none
     */
    private ?string $initialPrefix;

    /**
     * Initialization
     *
     * @param string      $namespace     The base namespace
     * @param string|null $initialPrefix The initial prefix, Null if none
     */
    public function __construct (string $namespace, ?string $initialPrefix = null) {
        $this->setNamespace($namespace);
        $this->setInitialPrefix($initialPrefix);
    }

    /**
     * The base namespace
     *
     * @return string The base namespace
     */
    public function getNamespace (): string {
        return $this->namespace;
    }
    /**
     * Set the base namespace
     *
     * @param string $namespace The base namespace
     *
     * @return $this
     */
    public function setNamespace (string $namespace): self {
        if (mb_substr($namespace, 0, 1) !== '\\') {
            $namespace = '\\' . $namespace;
        }
        $this->namespace = $namespace;
        return $this;
    }

    /**
     * The initial prefix, Null if none
     *
     * @return string|null The initial prefix, Null if none
     */
    public function getInitialPrefix (): ?string {
        return $this->initialPrefix;
    }
    /**
     * Set the initial prefix, Null if none
     *
     * @param string|null $initialPrefix The initial prefix, Null if none
     *
     * @return $this
     */
    public function setInitialPrefix (?string $initialPrefix): self {
        $this->initialPrefix = $initialPrefix;
        return $this;
    }

    /**
     * @inheritDoc
     */
    public function getCommandPrefix (Command $command): ?string {
        $commandClass = new ReflectionClass($command);
        $commandNamespace = '\\' . $commandClass->getNamespaceName();

        if ($commandNamespace !== $this->getNamespace() && mb_substr($commandNamespace, mb_strlen($this->getNamespace() . '\\')) !== $this->getNamespace() . '\\') {
            return null;
        }
        return implode(
            ':',
            array_filter(
                [
                    $this->getInitialPrefix(),
                    mb_strtolower(
                        preg_replace(
                            [
                                '/^' . preg_quote($this->getNamespace(), '/') . '(?:\\\\|$)/',
                                '/\\\\/',
                            ],
                            [
                                '',
                                ':',
                            ],
                            $commandNamespace
                        )
                    ),
                ]
            )
        );
    }
}