// Copyright (c) 2011 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.

#include "chrome/browser/spellchecker/spellcheck_host.h"

#include "base/string_split.h"
#include "base/synchronization/waitable_event.h"
#include "chrome/browser/prefs/pref_member.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/spellchecker/spellcheck_host_impl.h"
#include "chrome/browser/spellchecker/spellcheck_platform_mac.h"
#include "chrome/common/pref_names.h"
#include "chrome/common/spellcheck_common.h"

using content::BrowserThread;

namespace {

// An event used by browser tests to receive status events from this class and
// its derived classes.
base::WaitableEvent* g_status_event = NULL;
SpellCheckHost::EventType g_status_type = SpellCheckHost::BDICT_NOTINITIALIZED;

}  // namespace

// static
SpellCheckHost* SpellCheckHost::Create(
    SpellCheckProfileProvider* profile,
    const std::string& language,
    net::URLRequestContextGetter* request_context_getter,
    SpellCheckHostMetrics* metrics) {
  SpellCheckHostImpl* host =
      new SpellCheckHostImpl(profile, language, request_context_getter,
                             metrics);
  if (!host)
    return NULL;

  host->Initialize();
  return host;
}

// static
int SpellCheckHost::GetSpellCheckLanguages(
    Profile* profile,
    std::vector<std::string>* languages) {
  StringPrefMember accept_languages_pref;
  StringPrefMember dictionary_language_pref;
  accept_languages_pref.Init(prefs::kAcceptLanguages, profile->GetPrefs(),
                             NULL);
  dictionary_language_pref.Init(prefs::kSpellCheckDictionary,
                                profile->GetPrefs(), NULL);
  std::string dictionary_language = dictionary_language_pref.GetValue();

  // The current dictionary language should be there.
  languages->push_back(dictionary_language);

  // Now scan through the list of accept languages, and find possible mappings
  // from this list to the existing list of spell check languages.
  std::vector<std::string> accept_languages;

#if defined(OS_MACOSX)
  if (spellcheck_mac::SpellCheckerAvailable())
    spellcheck_mac::GetAvailableLanguages(&accept_languages);
  else
    base::SplitString(accept_languages_pref.GetValue(), ',', &accept_languages);
#else
  base::SplitString(accept_languages_pref.GetValue(), ',', &accept_languages);
#endif  // !OS_MACOSX

  for (std::vector<std::string>::const_iterator i = accept_languages.begin();
       i != accept_languages.end(); ++i) {
    std::string language =
        SpellCheckCommon::GetCorrespondingSpellCheckLanguage(*i);
    if (!language.empty() &&
        std::find(languages->begin(), languages->end(), language) ==
        languages->end()) {
      languages->push_back(language);
    }
  }

  for (size_t i = 0; i < languages->size(); ++i) {
    if ((*languages)[i] == dictionary_language)
      return i;
  }
  return -1;
}

// static
bool SpellCheckHost::SignalStatusEvent(SpellCheckHost::EventType status_type) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));

  if (!g_status_event)
    return false;
  g_status_type = status_type;
  g_status_event->Signal();
  return true;
}

// static
void SpellCheckHost::AttachStatusEvent(base::WaitableEvent* status_event) {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  g_status_event = status_event;
}

// static
SpellCheckHost::EventType SpellCheckHost::WaitStatusEvent() {
  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));

  if (g_status_event)
    g_status_event->Wait();
  return g_status_type;
}