<?php

namespace App\Http\Controllers;

use App\Enums\Common\Code;
use App\Models\Image as ImageModel;
use Illuminate\Http\Exceptions\HttpResponseException;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Intervention\Image\Facades\Image;

class ImageController
{
    public $upload_img = [
            //验证
            'rule' => [
                'size' => 3 * 1024 * 1024, //大小限制
                'ext' => 'jpeg,jpg,png,gif', //文件类型限制
            ],
            //生成文件规则
            'savename' => 'uniqid',
            //设置静态缓存参数(304)
            'header' => [
                'Cache-Control' => 'max-age=2592000',
                'Pragma' => 'cache',
                'Expires' => "%Expires%", // cache 1 month
                'etag' => "%etag%",
                'Last-Modified' => "%Last-Modified%",
                'Content-Description' => 'File Transfer',
            ],
            //图片保存根路径
            'path' => './uploads/images/',
            //图片上传变量名
            'name' => 'image',
    ];
    public $request = '';

    public function __construct(Request $request)
    {
        $this->request = $request;
    }

    public function index($hash = '', $w = 0 ,$h = 0){
        if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) || isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
            header("HTTP/1.1 304 Not Modified");
            exit;
        }
        $imageModel = new ImageModel();
        $info = $imageModel->read(['hash'=>$hash]);
        if ($info === false) {
            $this->response('指定图片不存在!', Code::USER_ERROR);
        }
        //查看缩略图是否存在
        $filename = './../uploads/images/cache_'. $info['hash'] . $w . '_' . $h;
        if(is_file($filename)){
            $last_modified_time = gmdate(time() + ((30 * 60 * 60 * 24))) . " GMT";
            $header = str_replace(['%Expires%', "%etag%", '%Last-Modified%'],
                [$last_modified_time, $hash . ':' . $w . '_' . $h . '_' . 2, $last_modified_time], $this->upload_img['header']);
            $content = file_get_contents($filename);
            $header['Content-Length'] = $info['size'];
        }else{
            $path = $info['path'];
            if (!is_file($path)) {
                $this->response('指定图片已被系统删除!', Code::USER_ERROR);
            }
            $content = '';
            $last_modified_time = gmdate(time() + ((30 * 60 * 60 * 24))) . " GMT";
            $header = str_replace(['%Expires%', "%etag%", '%Last-Modified%'],
                [$last_modified_time, $hash . ':' . $w . '_' . $h . '_' . 2, $last_modified_time], $this->upload_img['header']);
            if ($w > 0 && $h > 0) {
                $path = $this->cacheImage($info, $w, $h);
                $content = file_get_contents($path);
                $header['Content-Length'] = strlen($content);
            } else {
                $content = file_get_contents($path);
                $header['Content-Length'] = $info['size'];
            }
        }
//        $img_type = $info['type'];
//        $content = base64_encode($content);
//        $img_base64 = 'data:image/' . $img_type . ';base64,' . $content;
        return response($content, 200, $header);
    }
    /**
     * 图片上传
     */
    public function upload() {
        $this->request->validate([
            'image'=>['required'],
        ],[
            'image.required'=>'图片必须填写',
        ]);
        $files = $this->request->file('image');
        if (empty($files)) {
            $this->response('没有上传的文件!', 400);
        }
        $type = $this->request->post('type', 'single');
        if ($type == 'multi') {
            return $this->multi($files);
        } else {
            return $this->single($files);
        }
    }
    /**
     * @name :上传图片
     * @return void
     * @author :liyuhang
     * @method
     */
    public function single($files){
        $hash = hash_file('md5', $files->getPathname());
        $url = './../uploads/images/';
        $filename = date('ymdHis').rand(10000,99999);
        $res =  $this->request->file('image')->move($url,$filename);
        if ($res === false) {
            return $this->response($files->getError(), Code::USER_ERROR);
        }
        $imageModel = new ImageModel();
        $data = [
            'path' => $url.$filename,
            'created_at' => date('Y-m-d H:i:s',time()),
            'size' => $res->getSize(),
            'hash' => $hash.$filename,
            'type'=>$files->getClientOriginalExtension(),
        ];
        $rs = $imageModel->add($data);
        if ($rs === false) {
            return $this->response('添加失败', Code::USER_ERROR);
        }
        return $hash.$filename;
    }
    /**
     * 生成缩略图缓存
     * @param type $info
     * @param type $w
     * @param type $h
     * @return string
     */
    private function cacheImage($info, $w, $h) {
        $path = $info['path'];
        $filename = './../uploads/images/cache_'. $info['hash'] . $w . '_' . $h;
        Image::make($path)->resize($w, $h)->save($filename);
        return $filename;
    }

    /**
     * 多图片上传
     * @param type $files file对象集合
     * @return type
     */
    private function multi($files) {
        if (!is_array($files)) {
            $files = [$files];
        }
        $save_data = [];
        $data = [];
        foreach ($files as $file) {
            $hash = hash_file('md5', $file->getPathname());
            $url = './../uploads/images/';
            $filename = date('ymdHis').rand(10000,99999);
            $res = $file->move($url,$filename);
            if ($res === false) {
                return $this->response($file->getError(), Code::USER_ERROR);
            }
            $save_data[] = [
                'path' => $url.$filename,
                'created_at' => date('Y-m-d H:i:s',time()),
                'size' => $res->getSize(),
                'hash' => $hash.$filename,
                'type'=>$files->getClientOriginalExtension(),
            ];
            $data[] = $hash.$filename;
        }
        $imageModel = new ImageModel();
        $imageModel->insertAll($save_data);
        return $data;
    }
    /**
     * @name 统一返回参数
     * @return JsonResponse
     * @author :liyuhang
     * @method
     */
    public function response($msg = null,string $code = Code::SUCCESS,$data = [],$result_code = 200,$type = 'application/json'): JsonResponse
    {
        $code = Code::fromValue($code);
        $result = [
            'msg' => $msg == ' ' ? $code->description : $msg,
            'code' => $code->value,
            'data' => $data,
        ];
        $this->header['Content-Type'] = $type;
        $response =  response($result,$result_code,$this->header);;
        throw new HttpResponseException($response);
    }
}