// Copyright (c) 2012 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 "android_webview/browser/aw_browser_main_parts.h"

#include "android_webview/browser/aw_browser_context.h"
#include "android_webview/browser/aw_result_codes.h"
#include "android_webview/native/aw_assets.h"
#include "base/android/build_info.h"
#include "base/android/memory_pressure_listener_android.h"
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/path_service.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/common/content_client.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/result_codes.h"
#include "content/public/common/url_utils.h"
#include "gpu/command_buffer/service/mailbox_synchronizer.h"
#include "net/android/network_change_notifier_factory_android.h"
#include "net/base/network_change_notifier.h"
#include "ui/base/l10n/l10n_util.h"
#include "ui/base/l10n/l10n_util_android.h"
#include "ui/base/layout.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/ui_base_paths.h"

namespace android_webview {

AwBrowserMainParts::AwBrowserMainParts(AwBrowserContext* browser_context)
    : browser_context_(browser_context) {
}

AwBrowserMainParts::~AwBrowserMainParts() {
}

void AwBrowserMainParts::PreEarlyInitialization() {
  net::NetworkChangeNotifier::SetFactory(
      new net::NetworkChangeNotifierFactoryAndroid());

  // Android WebView does not use default MessageLoop. It has its own
  // Android specific MessageLoop. Also see MainMessageLoopRun.
  DCHECK(!main_message_loop_.get());
  main_message_loop_.reset(new base::MessageLoopForUI);
  base::MessageLoopForUI::current()->Start();
}

int AwBrowserMainParts::PreCreateThreads() {
  int pak_fd = 0;
  int64 pak_off = 0;
  int64 pak_len = 0;

  // TODO(primiano): at present state there is a cyclic logic dependency
  // between l10n_util::GetApplicationLocale and our code here. l10n_util
  // decides which locale to ultimately use by scanning the pak files in the
  // data folder. What we ultimately want to achieve is knowing the pak file to
  // load from the apk beforehand, without looking at the data folder at all.
  // Fixing this cyclic dependency involves some refactoring in ResourceBundle
  // and l10n_util.
  // In the meanwhile we use the mmap path only as a fallback (i.e. we check
  // first for the existence of the pak files in the data dir). In the immediate
  // future this order should be reversed, and we should look in the data
  // directory only if we failed to mmap the pak file from the apk.
  bool did_init_from_file = !ui::ResourceBundle::InitSharedInstanceLocaleOnly(
                                 l10n_util::GetDefaultLocale(), NULL).empty();
  if (!did_init_from_file) {
    LOG(WARNING) << "Failed to load the locale pak from PATH_SERVICE. "
                    " Trying to mmap en-US.pak from the apk";
    if (AwAssets::OpenAsset("en-US.pak", &pak_fd, &pak_off, &pak_len)) {
      VLOG(0) << "Load from apk succesful, fd=" << pak_fd << " off=" << pak_off
              << " len=" << pak_len;
      ui::ResourceBundle::CleanupSharedInstance();
      ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(
          base::File(pak_fd),
          base::MemoryMappedFile::Region(pak_off, pak_len),
          /*should_load_common_resources=*/false);
    } else {
      LOG(WARNING) << "Failed to load en-US.pak from the apk too. "
                      "Bringing up WebView without any locale";
    }
  }

  // Try to directly mmap the webviewchromium.pak from the apk. Fall back to
  // load from file, using PATH_SERVICE, otherwise.
  if (AwAssets::OpenAsset("webviewchromium.pak", &pak_fd, &pak_off, &pak_len)) {
    VLOG(0) << "Loading webviewchromium.pak from, fd:" << pak_fd
            << " off:" << pak_off << " len:" << pak_len;
    ui::ResourceBundle::GetSharedInstance().AddDataPackFromFileRegion(
        base::File(pak_fd),
        base::MemoryMappedFile::Region(pak_off, pak_len),
        ui::SCALE_FACTOR_NONE);
  } else {
    base::FilePath pak_path;
    PathService::Get(ui::DIR_RESOURCE_PAKS_ANDROID, &pak_path);
    LOG(WARNING) << "Cannot load webviewchromium.pak assets from the apk. "
                    "Falling back loading it from " << pak_path.MaybeAsASCII();
    ui::ResourceBundle::GetSharedInstance().AddDataPackFromPath(
        pak_path.AppendASCII("webviewchromium.pak"), ui::SCALE_FACTOR_NONE);
  }

  base::android::MemoryPressureListenerAndroid::RegisterSystemCallback(
      base::android::AttachCurrentThread());

  return content::RESULT_CODE_NORMAL_EXIT;
}

void AwBrowserMainParts::PreMainMessageLoopRun() {
  // TODO(boliu): Can't support accelerated 2d canvas and WebGL with ubercomp
  // yet: crbug.com/352424.
  if (!gpu::gles2::MailboxSynchronizer::Initialize()) {
    CommandLine* cl = CommandLine::ForCurrentProcess();
    cl->AppendSwitch(switches::kDisableAccelerated2dCanvas);
    cl->AppendSwitch(switches::kDisableExperimentalWebGL);
  }

  browser_context_->PreMainMessageLoopRun();
  // This is needed for WebView Classic backwards compatibility
  // See crbug.com/298495
  content::SetMaxURLChars(20 * 1024 * 1024);
}

bool AwBrowserMainParts::MainMessageLoopRun(int* result_code) {
  // Android WebView does not use default MessageLoop. It has its own
  // Android specific MessageLoop.
  return true;
}

}  // namespace android_webview