// Copyright 2014 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "testing/fx_string_testhelpers.h"

#include <iomanip>
#include <ios>
#include <ostream>

#include "core/fxcrt/cfx_datetime.h"
#include "core/fxcrt/check_op.h"
#include "core/fxcrt/compiler_specific.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/span.h"
#include "fpdfsdk/cpdfsdk_helpers.h"

std::ostream& operator<<(std::ostream& os, const CFX_DateTime& dt) {
  os << dt.GetYear() << "-" << std::to_string(dt.GetMonth()) << "-"
     << std::to_string(dt.GetDay()) << " " << std::to_string(dt.GetHour())
     << ":" << std::to_string(dt.GetMinute()) << ":"
     << std::to_string(dt.GetSecond()) << "."
     << std::to_string(dt.GetMillisecond());
  return os;
}

std::vector<std::string> StringSplit(const std::string& str, char delimiter) {
  std::vector<std::string> result;
  size_t pos = 0;
  while (true) {
    size_t found = str.find(delimiter, pos);
    if (found == std::string::npos) {
      break;
    }

    result.push_back(str.substr(pos, found - pos));
    pos = found + 1;
  }
  result.push_back(str.substr(pos));
  return result;
}

std::string GetPlatformString(FPDF_WIDESTRING wstr) {
  WideString wide_string = WideStringFromFPDFWideString(wstr);
  return std::string(wide_string.ToUTF8().c_str());
}

std::wstring GetPlatformWString(FPDF_WIDESTRING wstr) {
  if (!wstr) {
    return std::wstring();
  }

  size_t characters = 0;
  while (wstr[characters]) {
    ++characters;
  }

  std::wstring platform_string;
  platform_string.reserve(characters);
  for (size_t i = 0; i < characters; ++i) {
    const unsigned char* ptr = reinterpret_cast<const unsigned char*>(&wstr[i]);
    platform_string.push_back(ptr[0] + 256 * ptr[1]);
  }
  return platform_string;
}

ScopedFPDFWideString GetFPDFWideString(const std::wstring& wstr) {
  size_t length = sizeof(uint16_t) * (wstr.size() + 1);
  ScopedFPDFWideString result(static_cast<FPDF_WCHAR*>(malloc(length)));

  // SAFETY: length was argument to malloc above.
  pdfium::span<uint8_t> result_span = UNSAFE_BUFFERS(
      pdfium::make_span(reinterpret_cast<uint8_t*>(result.get()), length));

  size_t i = 0;
  for (wchar_t w : wstr) {
    result_span[i++] = w & 0xff;
    result_span[i++] = (w >> 8) & 0xff;
  }
  result_span[i++] = 0;
  result_span[i] = 0;
  return result;
}

std::vector<FPDF_WCHAR> GetFPDFWideStringBuffer(size_t length_bytes) {
  DCHECK_EQ(length_bytes % sizeof(FPDF_WCHAR), 0u);
  return std::vector<FPDF_WCHAR>(length_bytes / sizeof(FPDF_WCHAR));
}