<?php

namespace app\common\model;

use app\common\model\driver\AliyunOss;
use app\common\model\driver\Local;
use app\common\model\driver\TxyunOss;
use think\Exception;

class FileUpload
{

    /**
     * @var int 储存策略
     */
    protected $policy;

    /**
     * @var int 上传用户
     */
    protected $uid;

    /**
     * @var array 上传数据
     */
    protected $info;

    /**
     * @var int 最大上传大小
     */
    protected $max_size;


    /**
     * 设置来源信息
     * @param $uid
     * @param $policy
     * @param $max_size
     * @return FileUpload
     */
    public function source($uid,$policy,$max_size): FileUpload
    {
        $this->uid = $uid;
        $this->policy = $policy;
        $this->max_size = $max_size;
        return $this;
    }

    /**
     * 检查文件信息
     * @throws Exception
     */
    protected function check(){

        if(empty($this->info['file']['folder'])){
            throw new Exception('上传目标文件夹不存在');
        }

        if(empty($this->info['file']['data'])){
            throw new Exception('请选择上传的文件');
        }

        if(empty($this->info['file']['size'])){
            throw new Exception('文件大小异常');
        }

        if(empty($this->info['file']['name'])){
            throw new Exception('上传文件名异常');
        }

        if($this->policy['type'] == 'remote'){
            throw new Exception('您不可以使用该存储策略');
        }

        if(!empty($this->max_size)){
            if($this->info['file']['size'] > $this->max_size){
                throw new Exception('单文件最大上传大小'.countSize($this->max_size));
            }
        }

        if(!empty($this->policy['filetype'])){
            $file_ext = $this->getFileExt($this->info['file']['name']);
            $allow_ext = explode(',',$this->policy['filetype']);
            if(!in_array($file_ext,$allow_ext)){
                throw new Exception('不允许上传'.$file_ext.'类型的文件');
            }
        }

        if(empty($this->info['chunk']['key'])){
            throw new Exception('分片密钥错误');
        }

    }

    /**
     * 获取文件后缀名
     * @param $filename
     * @return string
     */
    protected function getFileExt($filename): string
    {
        return strtolower(pathinfo($filename, PATHINFO_EXTENSION));
    }

    /**
     * 获取随机文件名
     * @param int $length
     * @return string
     */
    protected function getRandomKey(int $length = 16): string
    {
        $charTable = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $result = "";
        for ( $i = 0; $i < $length; $i++ ){
            $result .= $charTable[ mt_rand(0, strlen($charTable) - 1) ];
        }
        return $result;
    }

    /**
     * 获取上传目录
     * @param $key
     * @return string|string[]
     */
    protected function getPath($key)
    {
        // 目录分割
        $ds = DIRECTORY_SEPARATOR;

        // 配置目录
        $save_dir = str_replace('/',$ds,$this->policy['config']['save_dir']);

        // 根目录
        $root_path = realpath(env('root_path') . './public') . $save_dir;

        // 临时存储目录
        $temp_path = realpath(env('root_path') . './public') . str_replace('/',$ds,'/temp/');

        // 当前保存目录
        $file_path = date('Ymd') . $ds . $this->uid . $ds;

        //文件名
        $file_name = uniqid( "file_") . time();

        $data = [
            'root' => $root_path,
            'temp' => $temp_path,
            'file' => $file_path,
            'path' => $root_path . $file_path,
            'temp_path' => $temp_path . $file_path,
            'name' => $file_name,
            'filename' => $file_name .'.'. $this->getFileExt($this->info['file']['name'])
        ];

        if($key == 'all'){
            return $data;
        }

        return $data[$key] ?? '';
    }


    public function upload(){
        // 超时时间5分钟
        @set_time_limit(5 * 60);

        // 获取有效的目录ID
        $this->info['file']['folder'] = FileManage::getFolderAllowPid(input('post.folder_id',0),$this->uid);

        // 获取上传文件大小
        $this->info['file']['size'] = input('post.size',0);

        // 获取上传文件名
        $this->info['file']['name'] = input('post.name','');

        // 上传文件对象获取
        $this->info['file']['data'] = request()->file('file');

        // 分片上传
        $this->info['chunk']['key'] = input('post.chunks_key');
        $this->info['chunk']['chunk'] = input('post.chunk',0);
        $this->info['chunk']['chunks'] = input('post.chunks',0);

        $this->info['uid'] = $this->uid;

        // 参数校验
        $this->check();

        // 目录
        $path = $this->getPath('all');

        // 上传驱动
        switch ($this->policy['type']){
            // 阿里云
            case 'aliyunoss':
                $upload = new AliyunOss($this->info,$this->policy,$path);
                break;
            // 腾讯云
            case 'txyunoss':
                $upload = new TxyunOss($this->info,$this->policy,$path);
                break;
            // 本地
            default:
                $upload = new Local($this->info,$this->policy,$path);
                break;
        }

        // 上传文件
        $file_object = $upload->upload();

        // 插入数据库
        if($file_object != 'chunk_file' && $file_object != null){
            // 加入数据库
            $data = [
                'uid' => $this->uid,
                'origin_name' => $this->info['file']['name'],
                'file_name' => $file_object,
                'size' => $this->info['file']['size'],
                'ext' => $this->getFileExt($this->info['file']['name']),
                'parent_folder' => $this->info['file']['folder'],
                'policy_id' => $this->policy['id'],
                'create_time' => time(),
                'update_time' => time()
            ];

            $file_id = (new Stores)->insertGetId($data);

            $share_id = Shares::addShare($this->uid,$file_id,0);

            Stores::where('id',$file_id)->update(['shares_id' => $share_id]);

            return ['code' => 1,'msg' => '文件上传成功'];
        }

        return ['code' => 1,'chunks' => 'chunk 文件上传成功'];
    }

}