<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2017 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

use SplFileObject;

class File extends SplFileObject
{
    /**
     * 错误信息
     * @var string
     */
    private $error = '';
    // 当前完整文件名
    protected $filename;
    // 上传文件名
    protected $saveName;
    // 文件上传命名规则
    protected $rule = 'date';
    // 文件上传验证规则
    protected $validate = [];
    // 单元测试
    protected $isTest;
    // 上传文件信息
    protected $info;
    // 文件hash信息
    protected $hash = [];

    public function __construct($filename, $mode = 'r')
    {
        parent::__construct($filename, $mode);
        $this->filename = $this->getRealPath() ?: $this->getPathname();
    }

    /**
     * 是否测试
     * @param  bool   $test 是否测试
     * @return $this
     */
    public function isTest($test = false)
    {
        $this->isTest = $test;
        return $this;
    }

    /**
     * 设置上传信息
     * @param  array   $info 上传文件信息
     * @return $this
     */
    public function setUploadInfo($info)
    {
        $this->info = $info;
        return $this;
    }

    /**
     * 获取上传文件的信息
     * @param  string   $name
     * @return array|string
     */
    public function getInfo($name = '')
    {
        return isset($this->info[$name]) ? $this->info[$name] : $this->info;
    }

    /**
     * 获取上传文件的文件名
     * @return string
     */
    public function getSaveName()
    {
        return $this->saveName;
    }

    /**
     * 设置上传文件的保存文件名
     * @param  string   $saveName
     * @return $this
     */
    public function setSaveName($saveName)
    {
        $this->saveName = $saveName;
        return $this;
    }

    /**
     * 获取文件的哈希散列值
     * @param string $type
     * @return string
     */
    public function hash($type = 'sha1')
    {
        if (!isset($this->hash[$type])) {
            $this->hash[$type] = hash_file($type, $this->filename);
        }
        return $this->hash[$type];
    }

    /**
     * 检查目录是否可写
     * @param  string   $path    目录
     * @return boolean
     */
    protected function checkPath($path)
    {
        if (is_dir($path)) {
            return true;
        }

        if (mkdir($path, 0755, true)) {
            return true;
        } else {
            $this->error = ['directory {:path} creation failed', ['path' => $path]];
            return false;
        }
    }

    /**
     * 获取文件类型信息
     * @return string
     */
    public function getMime()
    {
        $finfo = finfo_open(FILEINFO_MIME_TYPE);
        return finfo_file($finfo, $this->filename);
    }

    /**
     * 设置文件的命名规则
     * @param  string   $rule    文件命名规则
     * @return $this
     */
    public function rule($rule)
    {
        $this->rule = $rule;
        return $this;
    }

    /**
     * 设置上传文件的验证规则
     * @param  array   $rule    验证规则
     * @return $this
     */
    public function validate($rule = [])
    {
        $this->validate = $rule;
        return $this;
    }

    /**
     * 检测是否合法的上传文件
     * @return bool
     */
    public function isValid()
    {
        if ($this->isTest) {
            return is_file($this->filename);
        }
        return is_uploaded_file($this->filename);
    }

    /**
     * 检测上传文件
     * @param  array   $rule    验证规则
     * @return bool
     */
    public function check($rule = [])
    {
        $rule = $rule ?: $this->validate;

        /* 检查文件大小 */
        if (isset($rule['size']) && !$this->checkSize($rule['size'])) {
            $this->error = 'filesize not match';
            return false;
        }

        /* 检查文件Mime类型 */
        if (isset($rule['type']) && !$this->checkMime($rule['type'])) {
            $this->error = 'mimetype to upload is not allowed';
            return false;
        }

        /* 检查文件后缀 */
        if (isset($rule['ext']) && !$this->checkExt($rule['ext'])) {
            $this->error = 'extensions to upload is not allowed';
            return false;
        }

        /* 检查图像文件 */
        if (!$this->checkImg()) {
            $this->error = 'illegal image files';
            return false;
        }
        return true;
    }

    /**
     * 检测上传文件后缀
     * @param  array|string   $ext    允许后缀
     * @return bool
     */
    public function checkExt($ext)
    {
        if (is_string($ext)) {
            $ext = explode(',', $ext);
        }

        $extension = strtolower(pathinfo($this->getInfo('name'), PATHINFO_EXTENSION));

        if (!in_array($extension, $ext)) {
            return false;
        }
        return true;
    }

    /**
     * 检测图像文件
     * @return bool
     */
    public function checkImg()
    {
        $extension = strtolower(pathinfo($this->getInfo('name'), PATHINFO_EXTENSION));

        /* 对图像文件进行严格检测 */
        if (in_array($extension, ['gif', 'jpg', 'jpeg', 'bmp', 'png', 'swf']) && !in_array($this->getImageType($this->filename), [1, 2, 3, 4, 6, 13])) {
            return false;
        }
        return true;
    }

    // 判断图像类型
    protected function getImageType($image)
    {
        if (function_exists('exif_imagetype')) {
            return exif_imagetype($image);
        } else {
            try {
                $info = getimagesize($image);
                return $info ? $info[2] : false;
            } catch (\Exception $e) {
                return false;
            }
        }
    }

    /**
     * 检测上传文件大小
     * @param  integer   $size    最大大小
     * @return bool
     */
    public function checkSize($size)
    {
        if ($this->getSize() > $size) {
            return false;
        }
        return true;
    }

    /**
     * 检测上传文件类型
     * @param  array|string   $mime    允许类型
     * @return bool
     */
    public function checkMime($mime)
    {
        if (is_string($mime)) {
            $mime = explode(',', $mime);
        }

        if (!in_array(strtolower($this->getMime()), $mime)) {
            return false;
        }

        return true;
    }

    /**
     * 移动文件
     * @param  string           $path    保存路径
     * @param  string|bool      $savename    保存的文件名 默认自动生成
     * @param  boolean          $replace 同名文件是否覆盖
     * @return false|File       false-失败 否则返回File实例
     */
    public function move($path, $savename = true, $replace = true)
    {
        // 文件上传失败，捕获错误代码
        if (!empty($this->info['error'])) {
            $this->error($this->info['error']);
            return false;
        }

        // 检测合法性
        if (!$this->isValid()) {
            $this->error = 'upload illegal files';
            return false;
        }

        // 验证上传
        if (!$this->check()) {
            return false;
        }

        $path = rtrim($path, DS) . DS;
        // 文件保存命名规则
        $saveName = $this->buildSaveName($savename);
        $filename = $path . $saveName;

        // 检测目录
        if (false === $this->checkPath(dirname($filename))) {
            return false;
        }

        /* 不覆盖同名文件 */
        if (!$replace && is_file($filename)) {
            $this->error = ['has the same filename: {:filename}', ['filename' => $filename]];
            return false;
        }

        /* 移动文件 */
        if ($this->isTest) {
            rename($this->filename, $filename);
        } elseif (!move_uploaded_file($this->filename, $filename)) {
            $this->error = 'upload write error';
            return false;
        }

        // 返回 File对象实例
        $file = new self($filename);
        $file->setSaveName($saveName);
        $file->setUploadInfo($this->info);

        return $file;
    }

    /**
     * 获取保存文件名
     * @param  string|bool   $savename    保存的文件名 默认自动生成
     * @return string
     */
    protected function buildSaveName($savename)
    {
        if (true === $savename) {
            // 自动生成文件名
            if ($this->rule instanceof \Closure) {
                $savename = call_user_func_array($this->rule, [$this]);
            } else {
                switch ($this->rule) {
                    case 'date':
                        $savename = date('Ymd') . DS . md5(microtime(true));
                        break;
                    default:
                        if (in_array($this->rule, hash_algos())) {
                            $hash     = $this->hash($this->rule);
                            $savename = substr($hash, 0, 2) . DS . substr($hash, 2);
                        } elseif (is_callable($this->rule)) {
                            $savename = call_user_func($this->rule);
                        } else {
                            $savename = date('Ymd') . DS . md5(microtime(true));
                        }
                }
            }
        } elseif ('' === $savename || false === $savename) {
            $savename = $this->getInfo('name');
        }

        if (!strpos($savename, '.')) {
            $savename .= '.' . pathinfo($this->getInfo('name'), PATHINFO_EXTENSION);
        }

        return $savename;
    }

    /**
     * 获取错误代码信息
     * @param int $errorNo  错误号
     */
    private function error($errorNo)
    {
        switch ($errorNo) {
            case 1:
            case 2:
                $this->error = 'upload File size exceeds the maximum value';
                break;
            case 3:
                $this->error = 'only the portion of file is uploaded';
                break;
            case 4:
                $this->error = 'no file to uploaded';
                break;
            case 6:
                $this->error = 'upload temp dir not found';
                break;
            case 7:
                $this->error = 'file write error';
                break;
            default:
                $this->error = 'unknown upload error';
        }
    }

    /**
     * 获取错误信息（支持多语言）
     * @return string
     */
    public function getError()
    {
        if (is_array($this->error)) {
            list($msg, $vars) = $this->error;
        } else {
            $msg  = $this->error;
            $vars = [];
        }

        return Lang::has($msg) ? Lang::get($msg, $vars) : $msg;
    }

    public function __call($method, $args)
    {
        return $this->hash($method);
    }
}
