<?php

/*
	Expected state: tested, should work.
*/

function check_if_file($db, $name, $folder_path){

	$owner = user_id($db, $name);

	$file_id = select_file_id($db, $owner, $folder_path);

	if($file_id){
		$check_if_file_db = $db->query("SELECT folder FROM files WHERE id=".$file_id.";");
		$check_if_file_ar = $check_if_file_db->fetchArray(SQLITE3_NUM);

		if($check_if_file_ar[0] == "FILE"){
			return true;
		} else {
			return false;
		}
	} else {
		//$content = get_path_to_empty_folder($db, $name, $folder_path);
		//print_empty_folder($content);
		//get_404("/", "Protected file");
		return false;
	}
}

function start_file_download($user, $path){

	$db = $GLOBALS["db"];

	$owner = user_id($db, $user);

	$file_id = select_file_id($db, $owner, $path);

	$file_db = $db->query("SELECT owner, share FROM files WHERE id=" . $file_id . ";");
	$file_ar = $file_db->fetchArray(SQLITE3_NUM);
	$file_owner = $file_ar[0];
	$share = $file_ar[1];
	$force_download = false;

	if($_SESSION["login"] && ($_SESSION["userid"] == $file_owner)){
		if(download_file($db, $file_id, $force_download)){
			return true;
		} else {
			return false;
		}
	} else {
		if($share != "PUBLIC"){
			return false;
		}

		if(download_file($db, $file_id, $force_download)){
			return true;
		} else {
			return false;
		}
	}
}

function check_file_hash($db, $file_id, $download_hash){
	if(preg_match("/[^0-9]/", $file_id)){
		return DOWNLOAD_FALSE_ID;
	}

	$check_hash_db = $db->query("SELECT owner, folder, share, download_link FROM files WHERE id=" . SQLite3::escapeString($file_id).";");
	$check_hash_ar = $check_hash_db->fetchArray(SQLITE3_NUM);

	if($check_hash_ar[1] != "FILE" || !$check_hash_ar){
		return DOWNLOAD_NOT_FILE;
	}

	if($check_hash_ar[2] != "PUBLIC"){
		if($_SESSION["userid"] != $check_hash_ar[0]){
			if($check_hash_ar[3] != $download_hash){
				return DOWNLOAD_PRIVATE_FILE;
			}
		}
	}

	$force_download = true;

	$var = download_file($db, $file_id, $force_download);
	if($var){
		return true;
	} else {
		return $var;
	}

}

function download_file($db, $file_id, $force_download){

	$file_db = $db->query("SELECT name, mime, size, hash FROM files WHERE id=". SQLite3::escapeString($file_id).";");
	$file_ar = $file_db->fetchArray(SQLITE3_NUM);

	$file_name = $file_ar[0];
	$file_mime = $file_ar[1];
	$file_size = $file_ar[2];
	$file_hash = $file_ar[3];

	$uploaddir = "../files/";
	$gzip_file = $uploaddir . $file_hash . ".gz";

//TODO: buffer output, print if reading == true

	header("Content-Type: ".$file_mime."");
	if(preg_match("/^application\/.+/", $file_mime) || $force_download){
		header("Content-Disposition: attachment; filename=\"".$file_name."\"");
	} else {
		header('filename="'.$file_name.'"');
	}

	header("Content-Length: ".$file_size);
	set_time_limit(0);
	$uncompressed_file = readgzfile($gzip_file);

	if($uncompressed_file){
		$db->exec("UPDATE  files SET lastseen=(SELECT strftime('%s', 'now')) WHERE id=".SQLite3::escapeString($file_id).";");
		return true;
	} else {
		return false;
	}
}