<?php

class SFTPDeployer extends Deployer
{
	public function start()
	{
		self::println();
		self::println("=== SFTP Deployer – Bring Up ===");
		if (in_array('fs', $this->components))
		{
			$this->start_fs();
		}
	}

	private function getFsParams()
	{
		return $this->params['fs'];
	}

	private function generateSshpassPrefix()
	{
		if (empty($this->getFsParam('privkey_path')) &&
			!empty($this->getFsParam('password')))
		{
			return 'sshpass -p '.escapeshellarg($this->getFsParam('password')).' ';
		}
		return '';
	}

	private function getFsParam($key)
	{
		return $this->getFsParams()[$key];
	}

	private function generateRsyncRemoteShell()
	{
		$prefix = 'ssh -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -p '.
			escapeshellarg($this->getFsParam('port'));
		if (!empty($this->getFsParam('privkey_path')))
			return $prefix.' -i ' . escapeshellarg($this->getFsParam('privkey_path'));
		else
			return $prefix;
	}

	private static function runCommand($command, &$stdout = null, &$stderr = null)
	{
		$descriptorSpec = [
			1 => ['pipe', 'w'],
			2 => ['pipe', 'w'],
		];
		$pipes = [];
		self::println("Running this command…:");
		self::println($command);
		$resource = proc_open($command, $descriptorSpec, $pipes, APP_PATH);
		$stdout = stream_get_contents($pipes[1]);
		$stderr = stream_get_contents($pipes[2]);
		self::println("---------- stdout ----------");
		self::println(trim($stdout));
		self::println("---------- stderr ----------");
		self::println(trim($stderr));
		self::println("----------------------------");
		foreach ($pipes as $pipe)
		{
			fclose($pipe);
		}
		return proc_close($resource);
	}

	public function stop()
	{
		self::println("=== SFTP Deployer – Tear Down ===");
	}

	public function unlinkAppFile($relative_path)
	{
		self::println("Deleting file \"$relative_path\" from deployed test location…");
		$fs_params = $this->getFsParams();
		$command = $this->generateSshpassPrefix().
			$this->generateRsyncRemoteShell().
			" ".escapeshellarg("{$fs_params['user']}@{$fs_params['host']}").
			" ".escapeshellarg("rm -v " . escapeshellarg(rtrim($fs_params['path'], '/')."/$relative_path"));
		$retcode = self::runCommand($command);
		if ($retcode === 0)
		{
			self::println("Deleted file \"$relative_path\" from deployed test location");
		}
		else
		{
			self::println("No such file to delete: \"$relative_path\"");
		}
	}

	private function start_fs()
	{
		$fs_params = $this->getFsParams();
		$fs_params['path'] = rtrim($fs_params['path'], '/') . '/';
		$command = $this->generateSshpassPrefix() .
			'rsync -e ' .
			escapeshellarg($this->generateRsyncRemoteShell()) .
			' --delete -avzHXShs ' .
			escapeshellarg(rtrim(APP_PATH, '/') . '/') . ' ' .
			escapeshellarg("{$fs_params['user']}@{$fs_params['host']}:{$fs_params['path']}");
		$retcode = self::runCommand($command);
		if ($retcode !== 0) {
			throw new Exception("SFTP deployment failed. Run with --debug to see stdout and stderr.");
		}
	}
}