<?php
	require_once("Constants.php");

	class UploadManager
	{
		private $upload_max_size;
		private $post_max_size;
		private $file;
		
		public function __construct()
		{
			$this->file = null;
			$this->upload_max_size = ini_get('upload_max_filesize');
			$this->post_max_size   = ini_get('post_max_size');
		}

		public function run($target_dir)
		{
			$res = $this->init();
			if (!$res["success"])
				return $res;

			if ( ($error_code = $this->file['error']) != UPLOAD_ERR_OK )
				return array(
					"success" => false,
					"error" => $this->getUploadErrorMessage($error_code)
				);
			
			$fileName = $this->file['name'];
			$fileTmp  = $this->file['tmp_name'];
			
			if( !is_uploaded_file($fileTmp) )
				return array(
					"success" => false,
					"error" => 'Error uploading file - unknown error.'
				);
		
			$movedFile = time().'_'.$this->generateRandomString().'_'.basename( $fileName );
			$target_path = $target_dir.$movedFile;
		
			if( !move_uploaded_file($fileTmp, $target_path) )
				return array(
					"success" => false,
					"error" => 'Error uploading file - could not save uploaded file - Internal error'
				);
	
			return array(
				"success" => true,
				"fileName" => $movedFile
			);
		}

		private function init()
		{
			$this->file = null;

			if ($_SERVER['REQUEST_METHOD'] == 'POST' && empty($_POST) && empty($_FILES) && $_SERVER['CONTENT_LENGTH'] > 0)
				return array(
					"success" => false,
					"error" => 'Error uploading file - Posted data is too large (limitation to '.$this->post_max_size.')'
                                );

			if (!isset($_FILES['sourcefile']))
				return array(
					"success" => false,
					"error" => 'Error uploading file - cannot get source file'
				);

			$this->file = $_FILES['sourcefile'];

			return  array(
				"success" => true
			);
		}
		
		private function getUploadErrorMessage($error)
		{
			$message = 'Error uploading file - ';
			switch($error)
			{
				case UPLOAD_ERR_OK:
					$message = false;
					break;
				case UPLOAD_ERR_INI_SIZE:
				case UPLOAD_ERR_FORM_SIZE:
					$message .= 'file too large (limitation to '.$this->upload_max_size.')';
					break;
				case UPLOAD_ERR_PARTIAL:
					$message .= 'file upload not completed.';
					break;
				case UPLOAD_ERR_NO_FILE:
					$message .= 'zero-length file uploaded.';
					break;
				default:
					$message .= 'internal error #'.$error;
					break;
			}
			return $message;
		}
		
		private function generateRandomString($length = 10) 
		{
			return substr(str_shuffle("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"), 0, $length);
		}
	}

	$upMgr = new UploadManager();

	$r = $upMgr->run(TREPS_PHP_TMP_DIR);

	echo json_encode($r);
?>