/*
 * MIT License
 *
 * Copyright (c) 2016-2019 xiongziliang <771730766@qq.com>
 *
 * This file is part of ZLMediaKit(https://github.com/xiongziliang/ZLMediaKit).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "HttpDownloader.h"
#include "Util/MD5.h"
#include "Util/File.h"
using namespace toolkit;

namespace mediakit {

HttpDownloader::HttpDownloader() {

}

HttpDownloader::~HttpDownloader() {
    closeFile();
}

void HttpDownloader::startDownload(const string& url, const string& filePath,bool bAppend,float timeOutSecond) {
    _filePath = filePath;
    if(_filePath.empty()){
        _filePath = exeDir() + "HttpDownloader/" + MD5(url).hexdigest();
    }
    _saveFile = File::createfile_file(_filePath.data(),bAppend ? "ab" : "wb");
    if(!_saveFile){
        auto strErr = StrPrinter << "打开文件失败:" << filePath << endl;
        throw std::runtime_error(strErr);
    }
    _bDownloadSuccess = false;
    if(bAppend){
        auto currentLen = ftell(_saveFile);
        if(currentLen){
            //最少续传一个字节，怕遇到http 416的错误
            currentLen -= 1;
            fseek(_saveFile,-1,SEEK_CUR);
        }
        addHeader("Range", StrPrinter << "bytes=" << currentLen << "-" << endl);
    }
    setMethod("GET");
    sendRequest(url,timeOutSecond);
}

int64_t HttpDownloader::onResponseHeader(const string& status,const HttpHeader& headers) {
    if(status != "200" && status != "206"){
        //失败
        shutdown(SockException(Err_shutdown,StrPrinter << "Http Status:" << status));
    }
    //后续全部是content
    return -1;
}

void HttpDownloader::onResponseBody(const char* buf, int64_t size, int64_t recvedSize, int64_t totalSize) {
    if(_saveFile){
        fwrite(buf,size,1,_saveFile);
    }
}

void HttpDownloader::onResponseCompleted() {
    closeFile();
    //InfoL << "md5Sum:" << getMd5Sum(_filePath);
    _bDownloadSuccess = true;
    if(_onResult){
        _onResult(Err_success,"success",_filePath);
        _onResult = nullptr;
    }
}

void HttpDownloader::onDisconnect(const SockException &ex) {
    closeFile();
    if(!_bDownloadSuccess){
        File::delete_file(_filePath.data());
    }
    if(_onResult){
        _onResult(ex.getErrCode(),ex.what(),_filePath);
        _onResult = nullptr;
    }
}

void HttpDownloader::closeFile() {
    if(_saveFile){
        fflush(_saveFile);
        fclose(_saveFile);
        _saveFile = nullptr;
    }
}


} /* namespace mediakit */