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<?php

namespace Laravel\Envoy;

use Closure;
use Symfony\Component\Process\Process;

abstract class RemoteProcessor
{
    /**
     * Run the given task over SSH.
     *
     * @param  \Laravel\Envoy\Task  $task
     * @param  \Closure|null  $callback
     * @return int
     */
    abstract public function run(Task $task, Closure $callback = null);

    /**
     * Run the given script on the given host.
     *
     * @param  string  $host
     * @param  \Laravel\Envoy\Task  $task
     * @return array
     */
    protected function getProcess($host, Task $task)
    {
        $target = $this->getConfiguredServer($host) ?: $host;

        $env = $this->getEnvironment($host);

        if (in_array($target, ['local', 'localhost', '127.0.0.1'])) {
            $process = Process::fromShellCommandline($task->script, null, $env);
        }

        // Here we'll run the SSH task on the server inline. We do not need to write the
        // script out to a file or anything. We will start the SSH process then pass
        // these lines of output back to the parent callback for display purposes.
        else {
            $delimiter = 'EOF-LARAVEL-ENVOY';

            foreach ($env as $k => $v) {
                if ($v !== false) {
                    $env[$k] = 'export '.$k.'="'.$v.'"'.PHP_EOL;
                }
            }

            if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
                $process = Process::fromShellCommandline("ssh $target -T");

                $process->setInput(
                    implode(PHP_EOL, $env)
                    .'set -e '.PHP_EOL
                    .str_replace("\r", '', $task->script)
                );
            } else {
                $process = Process::fromShellCommandline(
                    "ssh $target 'bash -se' << \\$delimiter".PHP_EOL
                    .implode(PHP_EOL, $env).PHP_EOL
                    .'set -e'.PHP_EOL
                    .$task->script.PHP_EOL
                    .$delimiter
                );
            }
        }

        return [$target, $process->setTimeout(null)];
    }

    /**
     * Get the appropriate environment variables.
     *
     * @param  string  $host
     * @return array
     */
    protected function getEnvironment($host)
    {
        return [
            'ENVOY_HOST' => $host,
        ];
    }

    /**
     * Gather the cumulative exit code for the processes.
     *
     * @param  array  $processes
     * @return int
     */
    protected function gatherExitCodes(array $processes)
    {
        $code = 0;

        foreach ($processes as $process) {
            $code = $code + $process->getExitCode();
        }

        return $code;
    }
}