// Copyright (c) 2013 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/extensions/launch_util.h"

#include "base/command_line.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_prefs.h"
#include "chrome/browser/ui/host_desktop.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/extensions/extension_constants.h"
#include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
#include "extensions/common/extension.h"

#if defined(OS_WIN)
#include "win8/util/win8_util.h"
#endif

#if defined(USE_ASH)
#include "ash/shell.h"
#endif

namespace extensions {
namespace {

// A preference set by the the NTP to persist the desired launch container type
// used for apps.
const char kPrefLaunchType[] = "launchType";

}  // namespace

LaunchType GetLaunchType(const ExtensionPrefs* prefs,
                         const Extension* extension) {
  int value = -1;
  LaunchType result = LAUNCH_TYPE_DEFAULT;

  // Launch hosted apps as windows by default for streamlined hosted apps.
  if (CommandLine::ForCurrentProcess()->
          HasSwitch(switches::kEnableStreamlinedHostedApps) &&
      extension->id() != extension_misc::kChromeAppId) {
    result = LAUNCH_TYPE_WINDOW;
  }

  if (prefs->ReadPrefAsInteger(extension->id(), kPrefLaunchType, &value) &&
      (value == LAUNCH_TYPE_PINNED ||
       value == LAUNCH_TYPE_REGULAR ||
       value == LAUNCH_TYPE_FULLSCREEN ||
       value == LAUNCH_TYPE_WINDOW)) {
    result = static_cast<LaunchType>(value);
  }
#if defined(OS_MACOSX)
    // App windows are not yet supported on mac.  Pref sync could make
    // the launch type LAUNCH_TYPE_WINDOW, even if there is no UI to set it
    // on mac.
    if (!extension->is_platform_app() && result == LAUNCH_TYPE_WINDOW)
      result = LAUNCH_TYPE_REGULAR;
#endif

#if defined(OS_WIN)
    // We don't support app windows in Windows 8 single window Metro mode.
    if (win8::IsSingleWindowMetroMode() && result == LAUNCH_TYPE_WINDOW)
      result = LAUNCH_TYPE_REGULAR;
#endif  // OS_WIN

  return result;
}

void SetLaunchType(ExtensionPrefs* prefs,
                   const std::string& extension_id,
                   LaunchType launch_type) {
  prefs->UpdateExtensionPref(extension_id, kPrefLaunchType,
      new base::FundamentalValue(static_cast<int>(launch_type)));
}

LaunchContainer GetLaunchContainer(const ExtensionPrefs* prefs,
                                   const Extension* extension) {
  LaunchContainer manifest_launch_container =
      AppLaunchInfo::GetLaunchContainer(extension);

  const LaunchContainer kInvalidLaunchContainer =
      static_cast<LaunchContainer>(-1);

  LaunchContainer result = kInvalidLaunchContainer;

  if (manifest_launch_container == LAUNCH_CONTAINER_PANEL) {
    // Apps with app.launch.container = 'panel' should always respect the
    // manifest setting.
    result = manifest_launch_container;
  } else if (manifest_launch_container == LAUNCH_CONTAINER_TAB) {
    // Look for prefs that indicate the user's choice of launch container. The
    // app's menu on the NTP provides a UI to set this preference.
    LaunchType prefs_launch_type = GetLaunchType(prefs, extension);

    if (prefs_launch_type == LAUNCH_TYPE_WINDOW) {
      // If the pref is set to launch a window (or no pref is set, and
      // window opening is the default), make the container a window.
      result = LAUNCH_CONTAINER_WINDOW;
#if defined(USE_ASH)
    } else if (prefs_launch_type == LAUNCH_TYPE_FULLSCREEN &&
               chrome::GetActiveDesktop() == chrome::HOST_DESKTOP_TYPE_ASH) {
      // LAUNCH_TYPE_FULLSCREEN launches in a maximized app window in ash.
      // For desktop chrome AURA on all platforms we should open the
      // application in full screen mode in the current tab, on the same
      // lines as non AURA chrome.
      result = LAUNCH_CONTAINER_WINDOW;
#endif
    } else {
      // All other launch types (tab, pinned, fullscreen) are
      // implemented as tabs in a window.
      result = LAUNCH_CONTAINER_TAB;
    }
  } else {
    // If a new value for app.launch.container is added, logic for it should be
    // added here. LAUNCH_CONTAINER_WINDOW is not present because there is no
    // way to set it in a manifest.
    NOTREACHED() << manifest_launch_container;
  }

  // All paths should set |result|.
  if (result == kInvalidLaunchContainer) {
    DLOG(FATAL) << "Failed to set a launch container.";
    result = LAUNCH_CONTAINER_TAB;
  }

  return result;
}

bool HasPreferredLaunchContainer(const ExtensionPrefs* prefs,
                                 const Extension* extension) {
  int value = -1;
  LaunchContainer manifest_launch_container =
      AppLaunchInfo::GetLaunchContainer(extension);
  return manifest_launch_container == LAUNCH_CONTAINER_TAB &&
      prefs->ReadPrefAsInteger(extension->id(), kPrefLaunchType, &value);
}

}  // namespace extensions