<?php

/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/

namespace Symfony\Component\Console\Descriptor;

use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Exception\CommandNotFoundException;

/**
* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
*
* @internal
*/
class ApplicationDescription
{
const GLOBAL_NAMESPACE = '_global';

private $application;
private $namespace;
private $showHidden;

/**
* @var array
*/
private $namespaces;

/**
* @var Command[]
*/
private $commands;

/**
* @var Command[]
*/
private $aliases;

public function __construct(Application $application, string $namespace = null, bool $showHidden = false)
{
$this->application = $application;
$this->namespace = $namespace;
$this->showHidden = $showHidden;
}

/**
* @return array
*/
public function getNamespaces()
{
if (null === $this->namespaces) {
$this->inspectApplication();
}

return $this->namespaces;
}

/**
* @return Command[]
*/
public function getCommands()
{
if (null === $this->commands) {
$this->inspectApplication();
}

return $this->commands;
}

/**
* @param string $name
*
* @return Command
*
* @throws CommandNotFoundException
*/
public function getCommand($name)
{
if (!isset($this->commands[$name]) && !isset($this->aliases[$name])) {
throw new CommandNotFoundException(sprintf('Command %s does not exist.', $name));
}

return isset($this->commands[$name]) ? $this->commands[$name] : $this->aliases[$name];
}

private function inspectApplication()
{
$this->commands = array();
$this->namespaces = array();

$all = $this->application->all($this->namespace ? $this->application->findNamespace($this->namespace) : null);
foreach ($this->sortCommands($all) as $namespace => $commands) {
$names = array();

/** @var Command $command */
foreach ($commands as $name => $command) {
if (!$command->getName() || (!$this->showHidden && $command->isHidden())) {
continue;
}

if ($command->getName() === $name) {
$this->commands[$name] = $command;
} else {
$this->aliases[$name] = $command;
}

$names[] = $name;
}

$this->namespaces[$namespace] = array('id' => $namespace, 'commands' => $names);
}
}

private function sortCommands(array $commands): array
{
$namespacedCommands = array();
$globalCommands = array();
foreach ($commands as $name => $command) {
$key = $this->application->extractNamespace($name, 1);
if (!$key) {
$globalCommands['_global'][$name] = $command;
} else {
$namespacedCommands[$key][$name] = $command;
}
}
ksort($namespacedCommands);
$namespacedCommands = array_merge($globalCommands, $namespacedCommands);

foreach ($namespacedCommands as &$commandsSet) {
ksort($commandsSet);
}
// unset reference to keep scope clear
unset($commandsSet);

return $namespacedCommands;
}
}