// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file defines specific implementation of BrowserDistribution class for
// Google Chrome.

#include <atlbase.h>
#include <shlwapi.h>

#include <map>

#include "base/logging.h"
#include "base/scoped_ptr.h"
#include "base/string_util.h"

#include "installer_util_strings.h"

namespace {

// Gets the language from the OS.  If we're unable to get the system language,
// defaults to en-us.
std::wstring GetSystemLanguage() {
  static std::wstring language;
  if (!language.empty())
    return language;
  // We don't have ICU at this point, so we use win32 apis.
  LCID id = GetThreadLocale();
  int length = GetLocaleInfo(id, LOCALE_SISO639LANGNAME, 0, 0);
  if (0 == length) {
    language = L"en-us";
    return language;
  }
  length = GetLocaleInfo(id, LOCALE_SISO639LANGNAME,
                         WriteInto(&language, length), length);
  DCHECK(length == language.length() + 1);
  StringToLowerASCII(&language);

  // Add the country if we need it.
  std::wstring country;
  length = GetLocaleInfo(id, LOCALE_SISO3166CTRYNAME, 0, 0);
  if (0 != length) {
    length = GetLocaleInfo(id, LOCALE_SISO3166CTRYNAME,
                           WriteInto(&country, length), length);
    DCHECK(length == country.length() + 1);
    StringToLowerASCII(&country);
    if (L"en" == language) {
      if (L"gb" == country) {
        language.append(L"-gb");
      } else {
        language.append(L"-us");
      }
    } else if (L"es" == language && L"es" != country) {
      language.append(L"-419");
    } else if (L"pt" == language) {
      if (L"br" == country) {
        language.append(L"-br");
      } else {
        language.append(L"-pt");
      }
    } else if (L"zh" == language) {
      if (L"tw" == country || L"mk" == country || L"hk" == country) {
        language.append(L"-tw");
      } else {
        language.append(L"-cn");
      }
    }
  }

  if (language.empty())
    language = L"en-us";

  return language;
}

// This method returns the appropriate language offset given the language as a
// string.  Note: This method is not thread safe because of how we create
// |offset_map|.
int GetLanguageOffset(const std::wstring& language) {
  static std::map<std::wstring, int> offset_map;
  if (offset_map.empty()) {
    offset_map[L"ar"] = IDS_L10N_OFFSET_AR;
    offset_map[L"bg"] = IDS_L10N_OFFSET_BG;
    offset_map[L"bn"] = IDS_L10N_OFFSET_BN;
    offset_map[L"ca"] = IDS_L10N_OFFSET_CA;
    offset_map[L"cs"] = IDS_L10N_OFFSET_CS;
    offset_map[L"da"] = IDS_L10N_OFFSET_DA;
    offset_map[L"de"] = IDS_L10N_OFFSET_DE;
    offset_map[L"el"] = IDS_L10N_OFFSET_EL;
    offset_map[L"en-gb"] = IDS_L10N_OFFSET_EN_GB;
    offset_map[L"en-us"] = IDS_L10N_OFFSET_EN_US;
    offset_map[L"es"] = IDS_L10N_OFFSET_ES;
    offset_map[L"es-419"] = IDS_L10N_OFFSET_ES_419;
    offset_map[L"et"] = IDS_L10N_OFFSET_ET;
    offset_map[L"fi"] = IDS_L10N_OFFSET_FI;
    offset_map[L"fil"] = IDS_L10N_OFFSET_FIL;
    offset_map[L"fr"] = IDS_L10N_OFFSET_FR;
    offset_map[L"gu"] = IDS_L10N_OFFSET_GU;
    offset_map[L"he"] = IDS_L10N_OFFSET_HE;
    offset_map[L"hi"] = IDS_L10N_OFFSET_HI;
    offset_map[L"hr"] = IDS_L10N_OFFSET_HR;
    offset_map[L"hu"] = IDS_L10N_OFFSET_HU;
    offset_map[L"id"] = IDS_L10N_OFFSET_ID;
    offset_map[L"it"] = IDS_L10N_OFFSET_IT;
    // Google web properties use iw for he. Handle both just to be safe.
    offset_map[L"iw"] = IDS_L10N_OFFSET_HE;
    offset_map[L"ja"] = IDS_L10N_OFFSET_JA;
    offset_map[L"kn"] = IDS_L10N_OFFSET_KN;
    offset_map[L"ko"] = IDS_L10N_OFFSET_KO;
    offset_map[L"lt"] = IDS_L10N_OFFSET_LT;
    offset_map[L"lv"] = IDS_L10N_OFFSET_LV;
    offset_map[L"ml"] = IDS_L10N_OFFSET_ML;
    offset_map[L"mr"] = IDS_L10N_OFFSET_MR;
    // Google web properties use no for nb. Handle both just to be safe.
    offset_map[L"nb"] = IDS_L10N_OFFSET_NO;
    offset_map[L"nl"] = IDS_L10N_OFFSET_NL;
    offset_map[L"no"] = IDS_L10N_OFFSET_NO;
    offset_map[L"or"] = IDS_L10N_OFFSET_OR;
    offset_map[L"pl"] = IDS_L10N_OFFSET_PL;
    offset_map[L"pt-br"] = IDS_L10N_OFFSET_PT_BR;
    offset_map[L"pt-pt"] = IDS_L10N_OFFSET_PT_PT;
    offset_map[L"ro"] = IDS_L10N_OFFSET_RO;
    offset_map[L"ru"] = IDS_L10N_OFFSET_RU;
    offset_map[L"sk"] = IDS_L10N_OFFSET_SK;
    offset_map[L"sl"] = IDS_L10N_OFFSET_SL;
    offset_map[L"sr"] = IDS_L10N_OFFSET_SR;
    offset_map[L"sv"] = IDS_L10N_OFFSET_SV;
    offset_map[L"ta"] = IDS_L10N_OFFSET_TA;
    offset_map[L"te"] = IDS_L10N_OFFSET_TE;
    offset_map[L"th"] = IDS_L10N_OFFSET_TH;
    // Some Google web properties use tl for fil. Handle both just to be safe.
    // They're not completely identical, but alias it here.
    offset_map[L"tl"] = IDS_L10N_OFFSET_FIL;
    offset_map[L"tr"] = IDS_L10N_OFFSET_TR;
    offset_map[L"uk"] = IDS_L10N_OFFSET_UK;
    offset_map[L"vi"] = IDS_L10N_OFFSET_VI;
    offset_map[L"zh-cn"] = IDS_L10N_OFFSET_ZH_CN;
    offset_map[L"zh-tw"] = IDS_L10N_OFFSET_ZH_TW;
  }

  std::map<std::wstring, int>::iterator it = offset_map.find(
      StringToLowerASCII(language));
  if (it != offset_map.end())
    return it->second;

  NOTREACHED() << "unknown system language-country";

  // Fallback on the en-US offset just in case.
  return IDS_L10N_OFFSET_EN_US;
}

}  // namespace

namespace installer_util {

std::wstring GetLocalizedString(int base_message_id) {
  std::wstring language = GetSystemLanguage();
  std::wstring localized_string;

  int message_id = base_message_id + GetLanguageOffset(language);
  const ATLSTRINGRESOURCEIMAGE* image = AtlGetStringResourceImage(
      _AtlBaseModule.GetModuleInstance(), message_id);
  if (image) {
    localized_string = std::wstring(image->achString, image->nLength);
  } else {
    NOTREACHED() << "Unable to find resource id " << message_id;
  }

  return localized_string;
}

// Here we generate the url spec with the Microsoft res:// scheme which is
// explained here : http://support.microsoft.com/kb/220830
std::wstring GetLocalizedEulaResource() {
  wchar_t full_exe_path[MAX_PATH];
  int len = ::GetModuleFileName(NULL, full_exe_path, MAX_PATH);
  if (len == 0 || len == MAX_PATH)
    return L"";
  std::wstring language = GetSystemLanguage();
  const wchar_t* resource = L"IDR_OEMPG_EN.HTML";

  static std::map<int, wchar_t*> html_map;
  if (html_map.empty()) {
    html_map[IDS_L10N_OFFSET_AR] = L"IDR_OEMPG_AR.HTML";
    html_map[IDS_L10N_OFFSET_BG] = L"IDR_OEMPG_BG.HTML";
    html_map[IDS_L10N_OFFSET_CA] = L"IDR_OEMPG_CA.HTML";
    html_map[IDS_L10N_OFFSET_CS] = L"IDR_OEMPG_CS.HTML";
    html_map[IDS_L10N_OFFSET_DA] = L"IDR_OEMPG_DA.HTML";
    html_map[IDS_L10N_OFFSET_DE] = L"IDR_OEMPG_DE.HTML";
    html_map[IDS_L10N_OFFSET_EL] = L"IDR_OEMPG_EL.HTML";
    html_map[IDS_L10N_OFFSET_EN_US] = L"IDR_OEMPG_EN.HTML";
    html_map[IDS_L10N_OFFSET_EN_GB] = L"IDR_OEMPG_EN_GB.HTML";
    html_map[IDS_L10N_OFFSET_ES] = L"IDR_OEMPG_ES.HTML";
    html_map[IDS_L10N_OFFSET_ES_419] = L"IDR_OEMPG_ES_419.HTML";
    html_map[IDS_L10N_OFFSET_ET] = L"IDR_OEMPG_ET.HTML";
    html_map[IDS_L10N_OFFSET_FI] = L"IDR_OEMPG_FI.HTML";
    html_map[IDS_L10N_OFFSET_FIL] = L"IDR_OEMPG_FIL.HTML";
    html_map[IDS_L10N_OFFSET_FR] = L"IDR_OEMPG_FR.HTML";
    html_map[IDS_L10N_OFFSET_HI] = L"IDR_OEMPG_HI.HTML";
    html_map[IDS_L10N_OFFSET_HR] = L"IDR_OEMPG_HR.HTML";
    html_map[IDS_L10N_OFFSET_HU] = L"IDR_OEMPG_HU.HTML";
    html_map[IDS_L10N_OFFSET_ID] = L"IDR_OEMPG_ID.HTML";
    html_map[IDS_L10N_OFFSET_IT] = L"IDR_OEMPG_IT.HTML";
    html_map[IDS_L10N_OFFSET_JA] = L"IDR_OEMPG_JA.HTML";
    html_map[IDS_L10N_OFFSET_KO] = L"IDR_OEMPG_KO.HTML";
    html_map[IDS_L10N_OFFSET_LT] = L"IDR_OEMPG_LT.HTML";
    html_map[IDS_L10N_OFFSET_LV] = L"IDR_OEMPG_LV.HTML";
    html_map[IDS_L10N_OFFSET_NL] = L"IDR_OEMPG_NL.HTML";
    html_map[IDS_L10N_OFFSET_NO] = L"IDR_OEMPG_NO.HTML";
    html_map[IDS_L10N_OFFSET_PL] = L"IDR_OEMPG_PL.HTML";
    html_map[IDS_L10N_OFFSET_PT_BR] = L"IDR_OEMPG_PT_BR.HTML";
    html_map[IDS_L10N_OFFSET_PT_PT] = L"IDR_OEMPG_PT_PT.HTML";
    html_map[IDS_L10N_OFFSET_RO] = L"IDR_OEMPG_RO.HTML";
    html_map[IDS_L10N_OFFSET_RU] = L"IDR_OEMPG_RU.HTML";
    html_map[IDS_L10N_OFFSET_SK] = L"IDR_OEMPG_SK.HTML";
    html_map[IDS_L10N_OFFSET_SL] = L"IDR_OEMPG_SL.HTML";
    html_map[IDS_L10N_OFFSET_SR] = L"IDR_OEMPG_SR.HTML";
    html_map[IDS_L10N_OFFSET_SV] = L"IDR_OEMPG_SV.HTML";
    html_map[IDS_L10N_OFFSET_TH] = L"IDR_OEMPG_TH.HTML";
    html_map[IDS_L10N_OFFSET_TR] = L"IDR_OEMPG_TR.HTML";
    html_map[IDS_L10N_OFFSET_UK] = L"IDR_OEMPG_UK.HTML";
    html_map[IDS_L10N_OFFSET_VI] = L"IDR_OEMPG_VI.HTML";
    html_map[IDS_L10N_OFFSET_ZH_CN] = L"IDR_OEMPG_ZH_CN.HTML";
    html_map[IDS_L10N_OFFSET_ZH_TW] = L"IDR_OEMPG_ZH_TW.HTML";
  }

  std::map<int, wchar_t*>::iterator it = html_map.find(
      GetLanguageOffset(language));
  if (it != html_map.end())
    resource = it->second;

  // Spaces and DOS paths must be url encoded.
  std::wstring url_path =
      StringPrintf(L"res://%ls/#23/%ls", full_exe_path, resource);
  DWORD count = url_path.size() * 3;
  scoped_ptr<wchar_t> url_canon(new wchar_t[count]);
  HRESULT hr = ::UrlCanonicalizeW(url_path.c_str(), url_canon.get(),
                                  &count, URL_ESCAPE_UNSAFE);
  if (SUCCEEDED(hr))
    return std::wstring(url_canon.get());
  return url_path;
}

}  // namespace installer_util