//========================================================================
//
// CurlCachedFile.cc
//
// This file is licensed under the GPLv2 or later
//
// Copyright 2009 Stefan Thomas <thomas@eload24.com>
// Copyright 2010, 2011 Hib Eris <hib@hiberis.nl>
// Copyright 2010, 2019 Albert Astals Cid <aacid@kde.org>
//
//========================================================================

#include <config.h>

#include "CurlCachedFile.h"

#include "goo/GooString.h"

//------------------------------------------------------------------------

CurlCachedFileLoader::CurlCachedFileLoader()
{
  url = nullptr;
  cachedFile = nullptr;
  curl = nullptr;
}

CurlCachedFileLoader::~CurlCachedFileLoader() {
  curl_easy_cleanup(curl);
}

static size_t
noop_cb(char *ptr, size_t size, size_t nmemb, void *ptr2)
{
  return size*nmemb;
}

size_t
CurlCachedFileLoader::init(GooString *urlA, CachedFile *cachedFileA)
{
  double contentLength = -1;
  long code = 0;
  size_t size;

  url = urlA;
  cachedFile = cachedFileA;
  curl = curl_easy_init();

  curl_easy_setopt(curl, CURLOPT_URL, url->c_str());
  curl_easy_setopt(curl, CURLOPT_HEADER, 1);
  curl_easy_setopt(curl, CURLOPT_NOBODY, 1);
  curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &noop_cb);
  curl_easy_perform(curl);
  curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
  if (code) {
     curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &contentLength);
     size = contentLength;
  } else {
     error(errInternal, -1, "Failed to get size of '{0:t}'.", url);
     size = -1;
  }
  curl_easy_reset(curl);

  return size;
}

static
size_t load_cb(const char *ptr, size_t size, size_t nmemb, void *data)
{
  CachedFileWriter *writer = (CachedFileWriter *) data;
  return (writer->write) (ptr, size*nmemb);
}

int CurlCachedFileLoader::load(const std::vector<ByteRange> &ranges, CachedFileWriter *writer)
{
  CURLcode r = CURLE_OK;
  size_t fromByte, toByte;
  for (const ByteRange &bRange : ranges) {

     fromByte = bRange.offset;
     toByte = fromByte + bRange.length - 1;
     GooString *range = GooString::format("{0:ud}-{1:ud}", fromByte, toByte);

     curl_easy_setopt(curl, CURLOPT_URL, url->c_str());
     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, load_cb);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, writer);
     curl_easy_setopt(curl, CURLOPT_RANGE, range->c_str());
     r = curl_easy_perform(curl);
     curl_easy_reset(curl);

     delete range;

     if (r != CURLE_OK) break;
  }
  return r;
}

//------------------------------------------------------------------------

