<?php
/**
 * List Controller
 */
require_once __DIR__ . '/../../../lib/DirScanner.php';
require_once __DIR__ . '/../../../plugins/Parsedown.php';
require_once __DIR__ . '/../../../plugins/Common.php';

Class ListController extends Controller {

    public function actionIndex() {
        $cateId = $this->get('id', '');
        $cacheParentDataId = $this->get('cid', '');
        if (empty($cateId) || empty($cacheParentDataId)) {
            throw new Exception("参数缺失！", 403);
        }


        //获取数据
        $menus = array();        //菜单，一级目录
        $htmlReadme = '';   //Readme.md 内容，底部网站详细介绍
        $htmlCateReadme = '';   //当前目录下的Readme.md 内容
        $menus_sorted = array(); //Readme_sort.txt 说明文件内容，一级目录菜单从上到下的排序

        $scanner = new DirScanner();

        //TODO: 根据参数cid获取id对应的目录realpath，从而只扫描这个目录
        $cacheSeconds = 3600;
        $cachedParentData = Common::getCacheFromFile($cacheParentDataId, $cacheSeconds);
        if (empty($cachedParentData)) {
            throw new Exception("缓存已过期，请返回上一页重新进入！", 404);
        }

        $currentDir = $cachedParentData[$cateId];
        if (empty($currentDir)) {
            throw new Exception("缓存数据中找不到当前目录，请返回上一页重新进入！", 404);
        }

        $scanner->setWebRoot($this->getCurrentWebroot($currentDir['realpath']));
        $scanner->setRootDir($currentDir['realpath']);

        //优先从缓存读取数据
        $maxScanDeep = 0;       //最大扫描目录级数
        $cacheKey = $this->getCacheKey($cateId, 'tree', $maxScanDeep);
        $cachedData = Common::getCacheFromFile($cacheKey);
        if (!empty($cachedData)) {
            $dirTree = $cachedData;
            $scanner->setTreeData($cachedData);
        }else {
            $dirTree = $scanner->scan($currentDir['realpath'], $maxScanDeep);
            Common::saveCacheToFile($cacheKey, $dirTree);
        }

        //优先从缓存读取数据
        $cacheKey = $cacheDataId = $this->getCacheKey($cateId, 'data', $maxScanDeep);
        $cachedData = Common::getCacheFromFile($cacheKey);
        if (!empty($cachedData)) {
            $scanResults = $cachedData;
            $scanner->setScanResults($cachedData);
        }else {
            $scanResults = $scanner->getScanResults();
            Common::saveCacheToFile($cacheKey, $scanResults);
        }

        //按照scanResults格式把当前目录扫描结果中的目录数据拼接到当前目录数据里: currentDir
        if (!empty($scanResults)) {
            $dirs = array();
            $files = array();
            foreach ($scanResults as $id => $item) {
                if (!empty($item['directory'])) {
                    array_push($dirs, $item);
                }else {
                    array_push($files, $item);
                }
            }

            if (!empty($dirs)) {
                $currentDir['directories'] = $dirs;
            }

            if (!empty($files)) {
                $currentDir['files'] = $files;
            }
    
            $scanResults = array($cateId => $currentDir);       //重新组装数据
        }


        //非首页统一从缓存获取目录数据，有效期 1 小时
        $cacheKey = $this->getCacheKey('all', 'menu', $maxScanDeep);
        $menus = Common::getCacheFromFile($cacheKey, 3600);
        

        //获取目录面包屑
        $subcate = $scanResults[$cateId];
        $breadcrumbs = $this->getBreadcrumbs($currentDir, $cachedParentData, $scanner);

        //获取当前目录下的readme
        $cateReadmeFile = $scanner->getDefaultReadme();
        if (!empty($cateReadmeFile)) {
            $Parsedown = new Parsedown();
            $content = file_get_contents($cateReadmeFile['realpath']);
            $htmlCateReadme = $Parsedown->text($content);
            $htmlCateReadme = $scanner->fixMDUrls($cateReadmeFile['realpath'], $htmlCateReadme);
        }

        //获取默认mp3文件
        //优先从缓存获取默认mp3文件
        $cacheKey = $this->getCacheKey('root', 'mp3', $maxScanDeep);
        $mp3File = Common::getCacheFromFile($cacheKey);


        //翻页支持
        $page = $this->get('page', 1);
        $pageSize = $this->get('limit', 24);

        $pageTitle = !empty($titles) ? $titles[0]['name'] : "FileSite.io - 无数据库、基于文件和目录的Markdown文档、网址导航、图书、图片、视频网站PHP开源系统";
        if (!empty($subcate)) {
            $pageTitle = "{$subcate['directory']}的照片，来自{$pageTitle}";
            if (!empty($subcate['title'])) {
                $pageTitle = $subcate['title'];
            }
        }
        $viewName = '//site/index';     //共享视图
        $params = compact(
            'cateId', 'dirTree', 'scanResults', 'menus', 'htmlReadme', 'breadcrumbs', 'htmlCateReadme',
            'mp3File', 'page', 'pageSize', 'cacheDataId'
        );
        return $this->render($viewName, $params, $pageTitle);
    }

    //实现php 5.5开始支持的array_column方法
    protected function array_column($arr, $col) {
        $out = array();

        if (!empty($arr) && is_array($arr) && !empty($col)) {
            foreach ($arr as $index => $item) {
                if (!empty($item[$col])) {
                    array_push($out, $item[$col]);
                }
            }
        }

        return $out;
    }

    //根据pid在目录数组里找出对应的父目录数据
    protected function getParentCateByPid($pid, $cates) {
        $parent = array();

        foreach ($cates as $index => $item) {
            if ($item['id'] == $pid) {
                $parent = $item;
                break;
            }else if (!empty($item['directories'])) {
                $parent = $this->getParentCateByPid($pid, $item['directories']);
                if (!empty($parent)) {break;}
            }
        }


        return $parent;
    }

    //根据目录结构以及当前目录获取面包屑
    //缓存key统一生成，方便按规则获取上一级目录的缓存cid
    protected function getBreadcrumbs($currentDir, $scanResults, $scanner) {
        $webroot = FSC::$app['config']['content_directory'];
        $arr = explode($webroot, $currentDir['realpath']);
        $breads = array();

        if (count($arr) < 2) {
            return $breads;
        }

        $cates = explode('/', $arr[1]);
        $parentCate = preg_replace("/\/$/", '', "{$arr[0]}{$webroot}");     //删除最后一个斜杠
        foreach ($cates as $index => $cate) {
            if (empty($cate)) {continue;}
            if ($cate == $currentDir['directory']) {break;}

            $subcate = "{$parentCate}/{$cate}";
            $cateId = $scanner->getId($subcate);

            //下一级子目录的id
            $parentCateId = $scanner->getId($parentCate);
            $maxScanDeep = 0;   //所有页面扫描深度都为 1
            $cacheKey = $this->getCacheKey($parentCateId, 'data', $maxScanDeep);

            array_push($breads, [
                'id' => $cateId,
                'name' => $cate,
                'url' => "/list/?id={$cateId}&cid={$cacheKey}",
            ]);

            $parentCate = $subcate;     //记录上一级目录
        }

        //最后一级
        array_push($breads, [
            'id' => $currentDir['id'],
            'name' => $currentDir['directory'],
            'url' => $currentDir['path'],
        ]);

        return $breads;
    }

}