<?php
ini_set("session.use_only_cookies", 0);
set_time_limit(0);
session_cache_limiter("must-revalidate");

require_once('slideshow_music.inc.php');

class SlideshowMusicAPI extends WebAPI {
	private $operationPemission = "admin";
	protected $idPrefix = 'slideshowmusic_';
	private $mimeType = array(
		'mp3' => 'audio/mpeg'
	);

	function __construct() {
		parent::__construct(SZ_WEBAPI_API_DESCRIPTION_PATH);
	}

	protected function Process()
	{
		if (!strcasecmp($this->method, "list")) {
			$this->SlideshowMusicList();
		} elseif (!strcasecmp($this->method, "get")) {
			session_write_close();
			$this->GetMusic();
		} else if (!strcasecmp($this->method, "add")) {
			$this->AddItem();
		} else if (!strcasecmp($this->method, "edit")) {
			$this->Edit();
		} else if (!strcasecmp($this->method, "delete")) {
			$this->Delete();
		}
	}

	private function SlideshowMusicList()
	{
		$resp = array();

		$params = $this->GetParams_List();

		$data = SlideshowMusic::ListItem($params['offset'], $params['limit']);
		$items = array();
		foreach ($data['data'] as $k => $v) {
			$v['id'] = $this->EncodeItemId($k);
			$items[] = $v;
		}
		$resp['items'] = $items;
		$resp['total'] = $data['total'];
        $offset = (0 > (int)$params['limit']) ? $resp['total'] : $params['offset'] + $params['limit'];
        $resp['offset'] = ($offset > $resp['total']) ?  $resp['total'] : $offset;
		$this->SetResponse($resp);
	}

	private function GetMusic()
	{
		$id = $this->DecodeItemId($_REQUEST['id']);
		if (false === $id) {
			$this->SetError(WEBAPI_ERR_BAD_REQUEST);
			goto End;
		}

		$path = SlideshowMusic::GetMusicPath($id);
		if (!$path) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_NO_FILE);
			goto End;
		}

		@header("Content-Type: audio/mpeg");
		@header("Content-Transfer-Encoding: binary");

		$this->GetRangeDownload($path);
		exit;

	End:
		return;
	}

	private function GetRangeDownload($file)
	{
		$fp = @fopen($file, 'rb');
		if (false == $fp) {
			return false;
		}

		$size   = filesize($file); // File size
		$length = $size;		   // Content length
		$start  = 0;			   // Start byte
		$end	= $size - 1;	   // End byte
		// Now that we've gotten so far without errors we send the accept range header
		// At the moment we only support single ranges.
		// Multiple ranges requires some more work to ensure it works correctly
		// and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
		//
		// Multirange support annouces itself with:
		// header('Accept-Ranges: bytes');
		//
		// Multirange content must be sent with multipart/byteranges mediatype,
		// (mediatype = mimetype)
		// as well as a boundry header to indicate the various chunks of data.
		//
		//header("Accept-Ranges: 0-$length");
		header('Accept-Ranges: bytes');
		// multipart/byteranges
		// http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
		if (isset($_SERVER['HTTP_RANGE'])) {
			$c_start = $start;
			$c_end   = $end;
			// Extract the range string
			list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
			// Make sure the client hasn't sent us a multibyte range
			if (strpos($range, ',') !== false) {

				// (?) Shoud this be issued here, or should the first
				// range be used? Or should the header be ignored and
				// we output the whole content?
				header('HTTP/1.1 416 Requested Range Not Satisfiable');
				header("Content-Range: bytes $start-$end/$size");
				// (?) Echo some info to the client?
				exit;
			}
			// If the range starts with an '-' we start from the beginning
			// If not, we forward the file pointer
			// And make sure to get the end byte if spesified
			if ($range{0} == '-') {

				// The n-number of the last bytes is requested
				$c_start = $size - substr($range, 1);
			} else {

				$range  = explode('-', $range);
				$c_start = $range[0];
				$c_end   = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
			}
			// Check the range and make sure it's treated according to the specs.
			// http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
			//
			// End bytes can not be larger than $end.
			$c_end = ($c_end > $end) ? $end : $c_end;
			// Validate the requested range and return an error if it's not correct.
			if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {

				header('HTTP/1.1 416 Requested Range Not Satisfiable');
				header("Content-Range: bytes $start-$end/$size");
				// (?) Echo some info to the client?
				exit;
			}
			$start  = $c_start;
			$end	= $c_end;
			$length = $end - $start + 1; // Calculate new content length
			header('HTTP/1.1 206 Partial Content');
		}
		// Notify the client the byte range we'll be outputting
		header("Content-Range: bytes $start-$end/$size");
		header("Content-Length: $length");


		// Start buffered download
		$this->OutputFileWithRange($fp, $start, $end);
		fclose($fp);
	}

	// this function output contain $end
	private function OutputFileWithRange($fp, $start, $end)
	{
		fseek($fp, $start);
		$buffer = 1024 * 8;
		while (!feof($fp) && ($end == -1 || ($p = ftell($fp)) <= $end)) {

			if ($p + $buffer > $end && $end != -1) {

				// In case we're only outputtin a chunk, make sure we don't
				// read past the length
				$buffer = $end - $p + 1;
			}

			echo fread($fp, $buffer);
			flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.
		}
	}

	private function AddItem()
	{
		$filename = $_FILES['file']['name'];
		$title = $_REQUEST['title'];

		if (!csSYNOPhotoMisc::IsMusicFile($filename)) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_FILE_EXT_ERR);
			goto End;
		}
		if (!isset($_FILES['file'])) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_NO_FILE);
			goto End;
		}

		if ($_FILES['file']['error'] > 0) { // files is not uploaded successfully by form upload
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_UPLOAD_ERROR);
			goto End;
		}

		if (SlideshowMusic::LIMIT <= SlideshowMusic::GetCount()) {
			$this->SetError(array(PHOTOSTATION_SLIDESHOWMUSIC_EXCEED_LIMIT, SlideshowMusic::LIMIT));
			goto End;
		}

		if (!SlideshowMusic::Add($filename, $_FILES['file']['tmp_name'], $title)) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_SET_FAIL);
			goto End;
		}
		$resp = SlideshowMusic::GetLastInsertMusic();
		$resp['id'] = $this->EncodeItemId($resp['id']);
		$this->SetResponse($resp);
	End:
		return;
	}

	private function Edit()
	{
		$params = $this->GetParams_Edit();

		if (!$params) {
			$this->SetError(WEBAPI_ERR_BAD_REQUEST);
			goto End;
		}

		$res = SlideshowMusic::EditById($params['id'], $params['title'], $params['default']);

		if (!$res) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_SET_FAIL);
		}
	End:
		return;
	}

	private function Delete()
	{
		$params = $this->GetParams_Delete();

		if (!$params) {
			$this->SetError(WEBAPI_ERR_BAD_REQUEST);
			goto End;
		}
		$res = SlideshowMusic::DeleteById($params['id']);

		if (!$res) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_SET_FAIL);
		}
	End:
		return;
	}

	private function GetParams_List()
	{
		// $variable + 0 => convert to integer
		$params = array(
			'offset' => !isset($_REQUEST['offset']) || $_REQUEST['offset'] < 0 ? 0 : $_REQUEST['offset'] + 0,
			'limit' => !isset($_REQUEST['limit']) || $_REQUEST['limit'] < 0 ? NULL : $_REQUEST['limit'] + 0,
		);
		return $params;
	}

	private function GetParams_Edit()
	{
		if (!isset($_REQUEST['id']) || !((isset($_REQUEST['title']) && '' !== $_REQUEST['title']) || isset($_REQUEST['default']))) {
			return false;
		}

		$id = $this->DecodeItemId($_REQUEST['id']);

		if (false === $id) {
			return false;
		}

		$params = array(
			'id' => $id,
			'title'	=> $_REQUEST['title'],
			'default' => isset($_REQUEST['default']) ? ("true" === $_REQUEST['default'] ? true : false) : NULL
		);
		return $params;
	}

	private function GetParams_Delete()
	{
		if (!isset($_REQUEST['id'])){
			return false;
		}

		$ids = explode(',', $_REQUEST['id']);
		$validIds= array();
		foreach($ids as $id) {
			$decodeId = $this->DecodeItemId($id);
			if(false === $decodeId) {
				continue;
			}
			$validIds[] = $decodeId;
		}

		if (!count($validIds)) {
			return false;
		}

		$params = array(
			'id' => $validIds
		);
		return $params;
	}

	protected function CheckPermission()
	{
		$res = true;
		$check = array(
			"add" => $this->operationPemission,
			"edit" => $this->operationPemission,
			"delete" => $this->operationPemission
		);
		if (!array_key_exists($this->method, $check)) {
			goto End;
		}

		$funcName = "check_".$check[$this->method];

		if (!method_exists($this, $funcName)) {
			$res = false;
			goto End;
		}

		$res = $this->$funcName();

	End:
		if (!$res) {
			$this->SetError(PHOTOSTATION_SLIDESHOWMUSIC_ACCESS_DENY);
		}
		return $res;
	}

	private function check_admin()
	{
		csSYNOPhotoDB::GetDBInstance()->SetSessionCache();
		csSYNOPhotoMisc::CheckSessionTimeOut(true);
		return isset($_SESSION[SYNOPHOTO_ADMIN_USER]['admin_syno_user']);
	}
}
$api = new SlideshowMusicAPI();
$api->Run();

?>