<?php

namespace app\common\service\storage\engine;

use app\Request;
use think\Exception;
use app\common\service\ConfigService;
use app\common\service\ImageCompressService;

/**
 * 存储引擎抽象类
 * Class server
 * @package app\common\library\storage\drivers
 */
abstract class Server
{
    protected $file;
    protected $error;
    protected $fileName;
    protected $fileInfo;

    // 是否为内部上传
    protected $isInternal = false;

    /**
     * 构造函数
     * Server constructor.
     */
    protected function __construct()
    {
    }

    /**
     * 设置上传的文件信息
     * @param string $name
     * @throws Exception
     */
    public function setUploadFile($name)
    {
        // 接收上传的文件
        $this->file = app('\app\Request')->file($name);
        
        if (empty($this->file)) {
            throw new Exception('未找到上传文件的信息');
        }
        // 文件信息
        $this->fileInfo = [
            'ext'      => $this->file->extension(),
            'size'     => $this->file->getSize(),
            'mime'     => $this->file->getMime(),
            'name'     => $this->file->getOriginalName(),
            'realPath' => $this->file->getRealPath(),
        ];
        // 如果是图片文件，进行压缩处理
        if ($this->isImageFile()) {
            $compressedPath = $this->compressImage();
            if ($compressedPath) {
                $this->fileInfo['realPath'] = $compressedPath;
                $this->fileInfo['size'] = filesize($compressedPath);
            }
        }
        // 生成保存文件名
        $this->fileName = $this->buildSaveName();
    }

    /**
     * 压缩图片
     */
    protected function compressImage()
    {

        // 获取压缩配置（可以从配置文件读取）
        $quality = ConfigService::get('upload', 'image_quality', 80);
        $maxWidth = ConfigService::get('upload', 'max_width', 1920);
        $maxHeight = ConfigService::get('upload', 'max_height', 1080);
        // 添加调试信息
        error_log('开始压缩图片: ' . $this->fileInfo['realPath']);
        $result = ImageCompressService::compress(
            $this->fileInfo['realPath'],
            $quality,
            $maxWidth,
            $maxHeight
        );
        if ($result === false) {
            error_log('图片压缩失败: ' . $this->fileInfo['realPath']);
        } else {
            error_log('图片压缩成功: ' . $result);
        }
        return $result;
    }

    /**
     * 判断是否为图片文件
     */
    protected function isImageFile()
    {
        $imageExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp'];
        return in_array(strtolower($this->fileInfo['ext']), $imageExtensions);
    }

    /**
     * 设置上传的文件信息
     * @param string $filePath
     */
    public function setUploadFileByReal($filePath)
    {
        // 设置为系统内部上传
        $this->isInternal = true;
        // 文件信息
        $this->fileInfo = [
            'name' => basename($filePath),
            'size' => filesize($filePath),
            'tmp_name' => $filePath,
            'error' => 0,
        ];
        // 生成保存文件名
        $this->fileName = $this->buildSaveName();
    }

    /**
     * Notes: 抓取网络资源
     * @param $url
     * @param $key
     * @author 张无忌(2021/3/2 14:15)
     * @return mixed
     */
    abstract protected function fetch($url, $key);

    /**
     * 文件上传
     * @param $save_dir (保存路径)
     * @return mixed
     */
    abstract protected function upload($save_dir);

    /**
     * 文件删除
     * @param $fileName
     * @return mixed
     */
    abstract protected function delete($fileName);

    /**
     * 返回上传后文件路径
     * @return mixed
     */
    abstract public function getFileName();

    /**
     * 返回文件信息
     * @return mixed
     */
    public function getFileInfo()
    {
        return $this->fileInfo;
    }

    protected function getRealPath()
    {
        return $this->fileInfo['realPath'];
    }

    /**
     * 返回错误信息
     * @return mixed
     */
    public function getError()
    {
        return $this->error;
    }

    /**
     * 生成保存文件名
     */
    private function buildSaveName()
    {
        // 要上传图片的本地路径
        $realPath = $this->getRealPath();
        // 扩展名
        $ext = pathinfo($this->getFileInfo()['name'], PATHINFO_EXTENSION);
        // 自动生成文件名
        return date('YmdHis') . substr(md5($realPath), 0, 5)
            . str_pad(rand(0, 9999), 4, '0', STR_PAD_LEFT) . ".{$ext}";
    }

}