<?php
if (!defined('BASEPATH'))
    exit('No direct script access allowed');

class Cache extends CI_Controller
{
    //缓存文件绝对路径
    private $dir = '';
    //存放缓存文件的数组
    private $file = array();
    //存放缓存文件夹的数组
    private $path = array();
    //缓存更新接口
    private $cache_api = '';
    //缓存更新参数
    private $post_para = '';
    //当前站点域名
    private $current_domain = '';
    //文件更新日期
    private $file_time = array();
    
    function __construct()
    {
        parent::__construct();
        $this->permission->is_admin();
        $this->load->model('Area_model');
        $this->load->model('InfoStructures_model');
        $this->load->model('Information_model');
        $this->site_code = $this->config->item('site_code');
    }
    
    /**
     * 
     * 公有函数：扫描已有缓存文件并更新。
     * 
     * 必要参数：
     * @param String $site_code
     * 
     */ 
    public function update()
    {
        //设置缓存文件文件夹
        $cache_config = $this->config->item('cache');
        $current_cache_config = $cache_config[$this->site_code];
        $this->dir = $current_cache_config['cache_path'];
        
        //设置当前站点
        $this->current_domain = $this->config->item('site_url');
        //设置缓存更新接口及POST参数
        $this->cache_api = $current_cache_config['cache_api'];
        $this->post_para = $current_cache_config['cache_api_para'];
        //遍历缓存文件夹
        $this->tree($this->dir, $this->file, $this->path, $this->file_time);
        //按目录筛选结果
        $this->filter($this->file, $this->path);
        
        //整理需要传递到视图的数据
        $data['file'] = $this->file;
        $data['path'] = $this->path;
        $data['file_time'] = $this->file_time;
        $data['cache_api'] = $this->cache_api;
        $data['post_para'] = $this->post_para;
        
        //视图
        $this->load->view('cache/update', $data);
    }
    
    /**
     * 
     * 私有函数：递归遍历缓存文件夹，将目录存放到$path，文件存放到$file。
     * 
     * 必要参数：
     * @param String $dir - 需要遍历的目录
     * @param Array $file - 存放文件结果的数组引用
     * @param Array $path - 存放路径结果的数组引用
     * @param Array $file_time - 存放文件更新日期的数组引用
     * 
     */ 
    private function tree($dir, &$file, &$path, &$file_time)
    {
        $mydir = dir($dir);
        while($f = $mydir->read())
        {
            if(is_dir("$dir/$f") && $f!="." && $f!=".." && (strpos($dir, '/cn/')==false))
            {
                $path[] = "$dir/$f";
                $this->tree("$dir/$f", $file, $path, $file_time);
            }
            else
            {
                if ($f!='.' && $f!='..' && (strpos($dir, '/cn/')==false))
                {
                    $file_temp = str_ireplace('index.htm###', '', $f.'###');
                    $file_temp = str_ireplace('###', '', $file_temp);
                    $path_temp = str_ireplace($this->dir, '', $dir);
                    $url_temp = $this->current_domain.$path_temp.'/'.$file_temp;
                    $file_time[$url_temp] = date("F d Y H:i:s", filemtime("$dir/$f"));
                    $file[] = $url_temp;
                }
            }
        }
        $mydir->close();
    }
    
    
    /**
     * 
     * 私有函数：筛选目录和文件。
     * 
     * 必要参数：
     * @param Array $file - 存放文件结果的数组引用
     * @param Array $path - 存放路径结果的数组引用
     * 
     * 可选参数：POST参数 - $_POST['p']
     * 
     */
    private function filter(&$file, &$path)
    {
        if (isset($_POST['p']) && !empty($_POST['p']))
        {
            //删选文件
            foreach ($file as &$f)
            {
                (stripos($f, $_POST['p'])!==false) or $f = false;
            }
            $file = array_filter($file);
            //删选目录
            foreach ($path as &$p)
            {
                (stripos($p, $_POST['p'])!==false) or $p = false;
            }
            $path = array_filter($path);
        }
    }
    
}
//end of Cache