<?php
/**
 * 获取已上传的文件列表
 * User: Jinqn
 * Date: 14-04-09
 * Time: 上午10:17
 */
include "Uploader.class.php";

/* 判断类型 */
switch ($_GET ['action']) {
	/* 列出文件 */
	case 'listfile' :
		$allowFiles = $CONFIG ['fileManagerAllowFiles'];
		$listSize = $CONFIG ['fileManagerListSize'];
		$path = $CONFIG ['fileManagerListPath'];
		break;
	/* 列出图片 */
	case 'listimage' :
	default :
		$allowFiles = $CONFIG ['imageManagerAllowFiles'];
		$listSize = $CONFIG ['imageManagerListSize'];
		$path = $CONFIG ['imageManagerListPath'];
}
$allowFiles = substr ( str_replace ( ".", "|", join ( "", $allowFiles ) ), 1 );

/* 获取参数 */
$size = isset ( $_GET ['size'] ) ? htmlspecialchars ( $_GET ['size'] ) : $listSize;
$start = isset ( $_GET ['start'] ) ? htmlspecialchars ( $_GET ['start'] ) : 0;
$end = $start + $size;

/* 获取文件列表 */
$path = $_SERVER ['DOCUMENT_ROOT'] . (substr ( $path, 0, 1 ) == "/" ? "" : "/") . $path;
$files = getfiles ( $path, $allowFiles );
if (! count ( $files )) {
	return json_encode ( array (
			"state" => "no match file",
			"list" => array (),
			"start" => $start,
			"total" => count ( $files ) 
	) );
}

/* 获取指定范围的列表 */
$len = count ( $files );
for($i = min ( $end, $len ) - 1, $list = array (); $i < $len && $i >= 0 && $i >= $start; $i --) {
	$list [] = $files [$i];
}
// 倒序
// for ($i = $end, $list = array(); $i < $len && $i < $end; $i++){
// $list[] = $files[$i];
// }

/* 返回数据 */
$result = json_encode ( array (
		"state" => "SUCCESS",
		"list" => $list,
		"start" => $start,
		"total" => count ( $files ) 
) );

return $result;

/**
 * 遍历获取目录下的指定类型的文件
 * 
 * @param
 *        	$path
 * @param array $files        	
 * @return array
 */
function getfiles($path, $allowFiles, &$files = array()) {
	if (! is_dir ( $path ))
		return null;
	if (substr ( $path, strlen ( $path ) - 1 ) != '/')
		$path .= '/';
	$handle = opendir ( $path );
	while ( false !== ($file = readdir ( $handle )) ) {
		if ($file != '.' && $file != '..') {
			$path2 = $path . $file;
			if (is_dir ( $path2 )) {
				getfiles ( $path2, $allowFiles, $files );
			} else {
				if (preg_match ( "/\.(" . $allowFiles . ")$/i", $file )) {
					$files [] = array (
							'url' => substr ( $path2, strlen ( $_SERVER ['DOCUMENT_ROOT'] ) ),
							'mtime' => filemtime ( $path2 ) 
					);
				}
			}
		}
	}
	return $files;
}