<?php

declare(strict_types=1);

namespace App\System;

class Command
{
	protected $command;

	protected $defaultArguments;

	protected $path;

	public function __construct(string $command, array $defaultArguments = [])
	{
		$this->command = $command;
		$this->defaultArguments = $defaultArguments;
		$this->path = static::find($command);

		if (!isset($this->path))
		{
			throw new \Exception('Command not found: '.$command);
		}
	}

	public function getPath()
	{
		return $this->path;
	}

	public function create(array $arguments)
	{
		$arguments = array_merge($this->defaultArguments, $arguments);
		foreach ($arguments as &$argument)
		{
			if (!is_object($argument) || !($argument instanceof CommandArgument))
			{
				$argument = new CommandArgument($argument);
			}
		}

		$command = [];
		if (strpos($this->path, ' ') === false)
		{
			$command[] = '"'.$this->path.'"';
		}
		else
		{
			$command[] = $this->path;
		}
		$command = array_merge($command, $arguments);

		$process = app()->make('App\\System\\Process', ['command' => $command]);
		$process->setStartModeSync();
		return $process;
	}

	public function __invoke(array $arguments)
	{
		return $this->create($arguments)->start()->getStdout();
	}

	protected static function find($command)
	{
		if (PHP_OS == 'WINNT')
		{
			$result = shell_exec('where '.escapeshellarg($command));
			// No idea why Windows is using unix line endings here
			// Trim the trailing newline, last result is always empty
			$result = explode("\n", trim($result));
			$result = end($result);
		}
		else
		{
			$result = shell_exec('command -v '.escapeshellarg($command));
		}

		if (!is_string($result))
		{
			return;
		}

		$result = trim($result);

		if (empty($result))
		{
			return;
		}

		return $result;
	}
}