// Copyright (c) 2013 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2010 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.

#import <Cocoa/Cocoa.h>

#include "include/cef_app.h"
#import "include/cef_application_mac.h"
#include "include/cef_command_ids.h"
#import "include/wrapper/cef_library_loader.h"
#include "tests/cefclient/browser/main_context_impl.h"
#include "tests/cefclient/browser/resource.h"
#include "tests/cefclient/browser/root_window.h"
#include "tests/cefclient/browser/test_runner.h"
#include "tests/shared/browser/client_app_browser.h"
#include "tests/shared/browser/main_message_loop_external_pump.h"
#include "tests/shared/browser/main_message_loop_std.h"
#include "tests/shared/common/client_switches.h"

namespace {

// Returns the top menu bar with the specified |tag|.
NSMenuItem* GetMenuBarMenuWithTag(NSInteger tag) {
  NSMenu* main_menu = [[NSApplication sharedApplication] mainMenu];
  NSInteger found_index = [main_menu indexOfItemWithTag:tag];
  if (found_index >= 0) {
    return [main_menu itemAtIndex:found_index];
  }
  return nil;
}

// Returns the item in |menu| that has the specified |action_selector|.
NSMenuItem* GetMenuItemWithAction(NSMenu* menu, SEL action_selector) {
  for (NSInteger i = 0; i < menu.numberOfItems; ++i) {
    NSMenuItem* item = [menu itemAtIndex:i];
    if (item.action == action_selector) {
      return item;
    }
  }
  return nil;
}

void RemoveMenuItem(NSMenu* menu, SEL action_selector) {
  NSMenuItem* item = GetMenuItemWithAction(menu, action_selector);
  if (item) {
    [menu removeItem:item];
  }
}

}  // namespace

// Receives notifications from the application. Will delete itself when done.
@interface ClientAppDelegate : NSObject <NSApplicationDelegate> {
 @private
  bool with_osr_;
}

- (id)initWithOsr:(bool)with_osr;
- (void)createApplication:(id)object;
- (void)tryToTerminateApplication:(NSApplication*)app;
- (void)testsItemSelected:(int)command_id;
- (IBAction)menuTestsGetText:(id)sender;
- (IBAction)menuTestsGetSource:(id)sender;
- (IBAction)menuTestsWindowNew:(id)sender;
- (IBAction)menuTestsWindowPopup:(id)sender;
- (IBAction)menuTestsWindowDialog:(id)sender;
- (IBAction)menuTestsRequest:(id)sender;
- (IBAction)menuTestsZoomIn:(id)sender;
- (IBAction)menuTestsZoomOut:(id)sender;
- (IBAction)menuTestsZoomReset:(id)sender;
- (IBAction)menuTestsSetFPS:(id)sender;
- (IBAction)menuTestsSetScaleFactor:(id)sender;
- (IBAction)menuTestsTracingBegin:(id)sender;
- (IBAction)menuTestsTracingEnd:(id)sender;
- (IBAction)menuTestsPrint:(id)sender;
- (IBAction)menuTestsPrintToPdf:(id)sender;
- (IBAction)menuTestsMuteAudio:(id)sender;
- (IBAction)menuTestsUnmuteAudio:(id)sender;
- (IBAction)menuTestsOtherTests:(id)sender;
- (IBAction)menuTestsDumpWithoutCrashing:(id)sender;
- (void)enableAccessibility:(bool)bEnable;
@end

// Provide the CefAppProtocol implementation required by CEF.
@interface ClientApplication : NSApplication <CefAppProtocol> {
 @private
  BOOL handlingSendEvent_;
}
@end

@implementation ClientApplication

- (BOOL)isHandlingSendEvent {
  return handlingSendEvent_;
}

- (void)setHandlingSendEvent:(BOOL)handlingSendEvent {
  handlingSendEvent_ = handlingSendEvent;
}

- (void)sendEvent:(NSEvent*)event {
  CefScopedSendingEvent sendingEventScoper;
  [super sendEvent:event];
}

// |-terminate:| is the entry point for orderly "quit" operations in Cocoa. This
// includes the application menu's quit menu item and keyboard equivalent, the
// application's dock icon menu's quit menu item, "quit" (not "force quit") in
// the Activity Monitor, and quits triggered by user logout and system restart
// and shutdown.
//
// The default |-terminate:| implementation ends the process by calling exit(),
// and thus never leaves the main run loop. This is unsuitable for Chromium
// since Chromium depends on leaving the main run loop to perform an orderly
// shutdown. We support the normal |-terminate:| interface by overriding the
// default implementation. Our implementation, which is very specific to the
// needs of Chromium, works by asking the application delegate to terminate
// using its |-tryToTerminateApplication:| method.
//
// |-tryToTerminateApplication:| differs from the standard
// |-applicationShouldTerminate:| in that no special event loop is run in the
// case that immediate termination is not possible (e.g., if dialog boxes
// allowing the user to cancel have to be shown). Instead, this method tries to
// close all browsers by calling CloseBrowser(false) via
// ClientHandler::CloseAllBrowsers. Calling CloseBrowser will result in a call
// to ClientHandler::DoClose and execution of |-performClose:| on the NSWindow.
// DoClose sets a flag that is used to differentiate between new close events
// (e.g., user clicked the window close button) and in-progress close events
// (e.g., user approved the close window dialog). The NSWindowDelegate
// |-windowShouldClose:| method checks this flag and either calls
// CloseBrowser(false) in the case of a new close event or destructs the
// NSWindow in the case of an in-progress close event.
// ClientHandler::OnBeforeClose will be called after the CEF NSView hosted in
// the NSWindow is dealloc'ed.
//
// After the final browser window has closed ClientHandler::OnBeforeClose will
// begin actual tear-down of the application by calling CefQuitMessageLoop.
// This ends the NSApplication event loop and execution then returns to the
// main() function for cleanup before application termination.
//
// The standard |-applicationShouldTerminate:| is not supported, and code paths
// leading to it must be redirected.
- (void)terminate:(id)sender {
  ClientAppDelegate* delegate = static_cast<ClientAppDelegate*>(
      [[NSApplication sharedApplication] delegate]);
  [delegate tryToTerminateApplication:self];
  // Return, don't exit. The application is responsible for exiting on its own.
}

// Detect dynamically if VoiceOver is running. Like Chromium, rely upon the
// undocumented accessibility attribute @"AXEnhancedUserInterface" which is set
// when VoiceOver is launched and unset when VoiceOver is closed.
- (void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute {
  if ([attribute isEqualToString:@"AXEnhancedUserInterface"]) {
    ClientAppDelegate* delegate = static_cast<ClientAppDelegate*>(
        [[NSApplication sharedApplication] delegate]);
    [delegate enableAccessibility:([value intValue] == 1)];
  }
  return [super accessibilitySetValue:value forAttribute:attribute];
}
@end

@implementation ClientAppDelegate

- (id)initWithOsr:(bool)with_osr {
  if (self = [super init]) {
    with_osr_ = with_osr;
  }
  return self;
}

// Create the application on the UI thread.
- (void)createApplication:(id)object {
  NSApplication* application = [NSApplication sharedApplication];

  // The top menu is configured using Interface Builder (IB). To modify the menu
  // start by loading MainMenu.xib in IB.
  //
  // To associate MainMenu.xib with ClientAppDelegate:
  // 1. Select "File's Owner" from the "Placeholders" section in the left side
  //    pane.
  // 2. Load the "Identity inspector" tab in the top-right side pane.
  // 3. In the "Custom Class" section set the "Class" value to
  //    "ClientAppDelegate".
  // 4. Pass an instance of ClientAppDelegate as the |owner| parameter to
  //    loadNibNamed:.
  //
  // To create a new top menu:
  // 1. Load the "Object library" tab in the bottom-right side pane.
  // 2. Drag a "Submenu Menu Item" widget from the Object library to the desired
  //    location in the menu bar shown in the center pane.
  // 3. Select the newly created top menu by left clicking on it.
  // 4. Load the "Attributes inspector" tab in the top-right side pane.
  // 5. Under the "Menu Item" section set the "Tag" value to a unique integer.
  //    This is necessary for the GetMenuBarMenuWithTag function to work
  //    properly.
  //
  // To create a new menu item in a top menu:
  // 1. Add a new receiver method in ClientAppDelegate (e.g. menuTestsDoStuff:).
  // 2. Load the "Object library" tab in the bottom-right side pane.
  // 3. Drag a "Menu Item" widget from the Object library to the desired
  //    location in the menu bar shown in the center pane.
  // 4. Double-click on the new menu item to set the label.
  // 5. Right click on the new menu item to show the "Get Source" dialog.
  // 6. In the "Sent Actions" section drag from the circle icon and drop on the
  //    new receiver method in the ClientAppDelegate source code file.
  //
  // Load the top menu from MainMenu.xib.
  [[NSBundle mainBundle] loadNibNamed:@"MainMenu"
                                owner:self
                      topLevelObjects:nil];

  // Set the delegate for application events.
  [application setDelegate:self];

  auto* main_context = client::MainContext::Get();

  NSMenuItem* tests_menu = GetMenuBarMenuWithTag(8);
  if (tests_menu) {
    if (!with_osr_) {
      // Remove the OSR-related menu items when not using OSR.
      RemoveMenuItem(tests_menu.submenu, @selector(menuTestsSetFPS:));
      RemoveMenuItem(tests_menu.submenu, @selector(menuTestsSetScaleFactor:));
    }
    if (!main_context->UseViewsGlobal()) {
      // Remove the Views-related menu items when not using Views.
      RemoveMenuItem(tests_menu.submenu, @selector(menuTestsWindowDialog:));
    }
  }

  auto window_config = std::make_unique<client::RootWindowConfig>();
  window_config->with_osr = with_osr_;

  // Create the first window.
  main_context->GetRootWindowManager()->CreateRootWindow(
      std::move(window_config));
}

- (void)tryToTerminateApplication:(NSApplication*)app {
  client::MainContext::Get()->GetRootWindowManager()->CloseAllWindows(false);
}

- (void)orderFrontStandardAboutPanel:(id)sender {
  [[NSApplication sharedApplication] orderFrontStandardAboutPanel:nil];
}

- (void)testsItemSelected:(int)command_id {
  if (auto browser = [self getActiveBrowser]) {
    client::test_runner::RunTest(browser, command_id);
  }
}

- (IBAction)menuTestsGetText:(id)sender {
  [self testsItemSelected:ID_TESTS_GETTEXT];
}

- (IBAction)menuTestsGetSource:(id)sender {
  [self testsItemSelected:ID_TESTS_GETSOURCE];
}

- (IBAction)menuTestsWindowNew:(id)sender {
  [self testsItemSelected:ID_TESTS_WINDOW_NEW];
}

- (IBAction)menuTestsWindowPopup:(id)sender {
  [self testsItemSelected:ID_TESTS_WINDOW_POPUP];
}

- (IBAction)menuTestsWindowDialog:(id)sender {
  [self testsItemSelected:ID_TESTS_WINDOW_DIALOG];
}

- (IBAction)menuTestsRequest:(id)sender {
  [self testsItemSelected:ID_TESTS_REQUEST];
}

- (IBAction)menuTestsZoomIn:(id)sender {
  [self testsItemSelected:ID_TESTS_ZOOM_IN];
}

- (IBAction)menuTestsZoomOut:(id)sender {
  [self testsItemSelected:ID_TESTS_ZOOM_OUT];
}

- (IBAction)menuTestsZoomReset:(id)sender {
  [self testsItemSelected:ID_TESTS_ZOOM_RESET];
}

- (IBAction)menuTestsSetFPS:(id)sender {
  [self testsItemSelected:ID_TESTS_OSR_FPS];
}

- (IBAction)menuTestsSetScaleFactor:(id)sender {
  [self testsItemSelected:ID_TESTS_OSR_DSF];
}

- (IBAction)menuTestsTracingBegin:(id)sender {
  [self testsItemSelected:ID_TESTS_TRACING_BEGIN];
}

- (IBAction)menuTestsTracingEnd:(id)sender {
  [self testsItemSelected:ID_TESTS_TRACING_END];
}

- (IBAction)menuTestsPrint:(id)sender {
  [self testsItemSelected:ID_TESTS_PRINT];
}

- (IBAction)menuTestsPrintToPdf:(id)sender {
  [self testsItemSelected:ID_TESTS_PRINT_TO_PDF];
}

- (IBAction)menuTestsMuteAudio:(id)sender {
  [self testsItemSelected:ID_TESTS_MUTE_AUDIO];
}

- (IBAction)menuTestsUnmuteAudio:(id)sender {
  [self testsItemSelected:ID_TESTS_UNMUTE_AUDIO];
}

- (IBAction)menuTestsOtherTests:(id)sender {
  [self testsItemSelected:ID_TESTS_OTHER_TESTS];
}

- (IBAction)menuTestsDumpWithoutCrashing:(id)sender {
  [self testsItemSelected:ID_TESTS_DUMP_WITHOUT_CRASHING];
}

- (scoped_refptr<client::RootWindow>)getActiveRootWindow {
  return client::MainContext::Get()
      ->GetRootWindowManager()
      ->GetActiveRootWindow();
}

- (CefRefPtr<CefBrowser>)getActiveBrowser {
  if (auto root_window = [self getActiveRootWindow]) {
    return root_window->GetBrowser();
  }
  return nullptr;
}

- (NSWindow*)getActiveBrowserNSWindow {
  if (auto browser = [self getActiveBrowser]) {
    if (auto view = CAST_CEF_WINDOW_HANDLE_TO_NSVIEW(
            browser->GetHost()->GetWindowHandle())) {
      return [view window];
    }
  }
  return nil;
}

- (void)enableAccessibility:(bool)bEnable {
  if (auto browser = [self getActiveBrowser]) {
    browser->GetHost()->SetAccessibilityState(bEnable ? STATE_ENABLED
                                                      : STATE_DISABLED);
  }
}

- (NSApplicationTerminateReply)applicationShouldTerminate:
    (NSApplication*)sender {
  return NSTerminateNow;
}

// Returns true if there is a modal window (either window- or application-
// modal) blocking the active browser. Note that tab modal dialogs (HTTP auth
// sheets) will not count as blocking the browser. But things like open/save
// dialogs that are window modal will block the browser.
- (BOOL)keyWindowIsModal {
  if ([NSApp modalWindow]) {
    return YES;
  }

  if (auto window = [self getActiveBrowserNSWindow]) {
    return [[window attachedSheet] isKindOfClass:[NSWindow class]];
  }

  return NO;
}

// AppKit will call -[NSUserInterfaceValidations validateUserInterfaceItem:] to
// validate UI items. Any item whose target is FirstResponder, or nil, will
// traverse the responder chain looking for a responder that implements the
// item's selector. The top menu (configured in MainMenu.xib) can contain menu
// items with selectors that are implemented by Chromium's
// RenderWidgetHostViewCocoa or NativeWidgetMacNSWindow classes. These classes
// live in the Cocoa view hierarchy and will be triggered only if the browser
// window is focused. When the browser window is not focused these selectors
// will be forwarded (by Chromium's CommandDispatcher class) to `[NSApp
// delegate]` (this class). The particular selectors of interest here are
// |-commandDispatch:| and |-commandDispatchUsingKeyModifiers:| which will have
// a tag value from include/cef_command_ids.h. For example, 37000 is IDC_FIND
// and can be triggered via the "Find..." menu item or the Cmd+g keyboard
// shortcut:
//
//   <menuItem title="Find..." tag="37000" keyEquivalent="g" id="209">
//        <connections>
//            <action selector="commandDispatch:" target="-1" id="241"/>
//        </connections>
//   </menuItem>
//
// If |-validateUserInterfaceItem:| returns YES then the menu item will be
// enabled and execution will trigger the associated selector.
//
// This implementation is based on Chromium's AppController class.
- (BOOL)validateUserInterfaceItem:(id<NSValidatedUserInterfaceItem>)item {
  SEL action = [item action];
  BOOL enable = NO;
  // Whether opening a new browser window is allowed.
  BOOL canOpenNewBrowser = YES;

  // Commands from the menu bar are only handled by commandDispatch: if there is
  // no key window.
  if (action == @selector(commandDispatch:) ||
      action == @selector(commandDispatchUsingKeyModifiers:)) {
    switch ([item tag]) {
      // Browser-level items that open in new tabs or perform an action in a
      // current tab should not open if there's a window- or app-modal dialog.
      case IDC_OPEN_FILE:
      case IDC_NEW_TAB:
      case IDC_FOCUS_LOCATION:
      case IDC_FOCUS_SEARCH:
      case IDC_SHOW_HISTORY:
      case IDC_SHOW_BOOKMARK_MANAGER:
      case IDC_CLEAR_BROWSING_DATA:
      case IDC_SHOW_DOWNLOADS:
      case IDC_IMPORT_SETTINGS:
      case IDC_MANAGE_EXTENSIONS:
      case IDC_HELP_PAGE_VIA_MENU:
      case IDC_OPTIONS:
        enable = canOpenNewBrowser && ![self keyWindowIsModal];
        break;
      // Browser-level items that open in new windows: allow the user to open
      // a new window even if there's a window-modal dialog.
      case IDC_NEW_WINDOW:
        enable = canOpenNewBrowser;
        break;
      case IDC_TASK_MANAGER:
        enable = YES;
        break;
      case IDC_NEW_INCOGNITO_WINDOW:
        enable = canOpenNewBrowser;
        break;
      default:
        enable = ![self keyWindowIsModal];
        break;
    }
  } else if ([self respondsToSelector:action]) {
    // All other selectors that this class implements.
    enable = YES;
  }

  return enable;
}

// This will get called in the case where the frontmost window is not a browser
// window, and the user has command-clicked a button in a background browser
// window whose action is |-commandDispatch:|
- (void)commandDispatch:(id)sender {
  // Handle the case where we're dispatching a command from a sender that's in a
  // browser window. This means that the command came from a background window
  // and is getting here because the foreground window is not a browser window.
  DCHECK(sender);
  if ([sender respondsToSelector:@selector(window)]) {
    id delegate = [[sender window] windowController];
    if ([delegate respondsToSelector:@selector(commandDispatch:)]) {
      [delegate commandDispatch:sender];
      return;
    }
  }

  // Handle specific commands where we want to make the last active browser
  // frontmost and then re-execute the command.
  switch ([sender tag]) {
    case IDC_FIND:
    case IDC_FIND_NEXT:
    case IDC_FIND_PREVIOUS:
      if (id window = [self getActiveBrowserNSWindow]) {
        [window makeKeyAndOrderFront:nil];
        if ([window respondsToSelector:@selector(commandDispatch:)]) {
          [window commandDispatch:sender];
          return;
        }
      }
      break;
    default:
      break;
  }

  LOG(INFO) << "Unhandled commandDispatch: for tag " << [sender tag];
}

// Same as |-commandDispatch:|, but executes commands using a disposition
// determined by the key flags. This will get called in the case where the
// frontmost window is not a browser window, and the user has command-clicked
// a button in a background browser window whose action is
// |-commandDispatchUsingKeyModifiers:|
- (void)commandDispatchUsingKeyModifiers:(id)sender {
  // Handle the case where we're dispatching a command from a sender that's in a
  // browser window. This means that the command came from a background window
  // and is getting here because the foreground window is not a browser window.
  DCHECK(sender);
  if ([sender respondsToSelector:@selector(window)]) {
    id delegate = [[sender window] windowController];
    if ([delegate
            respondsToSelector:@selector(commandDispatchUsingKeyModifiers:)]) {
      [delegate commandDispatchUsingKeyModifiers:sender];
      return;
    }
  }

  LOG(INFO) << "Unhandled commandDispatchUsingKeyModifiers: for tag "
            << [sender tag];
}

// Called when the user clicks the app dock icon while the application is
// already running.
- (BOOL)applicationShouldHandleReopen:(NSApplication*)theApplication
                    hasVisibleWindows:(BOOL)flag {
  if (auto root_window = [self getActiveRootWindow]) {
    root_window->Show(client::RootWindow::ShowNormal);
  }
  return NO;
}
@end

namespace client {
namespace {

int RunMain(int argc, char* argv[]) {
  // Load the CEF framework library at runtime instead of linking directly
  // as required by the macOS sandbox implementation.
  CefScopedLibraryLoader library_loader;
  if (!library_loader.LoadInMain()) {
    return 1;
  }

  int result = -1;

  CefMainArgs main_args(argc, argv);

  @autoreleasepool {
    // Initialize the ClientApplication instance.
    [ClientApplication sharedApplication];

    // If there was an invocation to NSApp prior to this method, then the NSApp
    // will not be a ClientApplication, but will instead be an NSApplication.
    // This is undesirable and we must enforce that this doesn't happen.
    CHECK([NSApp isKindOfClass:[ClientApplication class]]);

    // Parse command-line arguments.
    CefRefPtr<CefCommandLine> command_line =
        CefCommandLine::CreateCommandLine();
    command_line->InitFromArgv(argc, argv);

    // Create a ClientApp of the correct type.
    CefRefPtr<CefApp> app;
    ClientApp::ProcessType process_type =
        ClientApp::GetProcessType(command_line);
    if (process_type == ClientApp::BrowserProcess) {
      app = new ClientAppBrowser();
    }

    // Create the main context object.
    std::unique_ptr<MainContextImpl> context(
        new MainContextImpl(command_line, true));

    CefSettings settings;

// When generating projects with CMake the CEF_USE_SANDBOX value will be defined
// automatically. Pass -DUSE_SANDBOX=OFF to the CMake command-line to disable
// use of the sandbox.
#if !defined(CEF_USE_SANDBOX)
    settings.no_sandbox = true;
#endif

    // Populate the settings based on command line arguments.
    context->PopulateSettings(&settings);

    // Create the main message loop object.
    std::unique_ptr<MainMessageLoop> message_loop;
    if (settings.external_message_pump) {
      message_loop = MainMessageLoopExternalPump::Create();
    } else {
      message_loop.reset(new MainMessageLoopStd);
    }

    // Initialize the CEF browser process. May return false if initialization
    // fails or if early exit is desired (for example, due to process singleton
    // relaunch behavior).
    if (!context->Initialize(main_args, settings, app, nullptr)) {
      return CefGetExitCode();
    }

    // Register scheme handlers.
    test_runner::RegisterSchemeHandlers();

    // Create the application delegate and window.
    ClientAppDelegate* delegate = [[ClientAppDelegate alloc]
        initWithOsr:settings.windowless_rendering_enabled ? true : false];
    // Set as the delegate for application events.
    NSApp.delegate = delegate;

    [delegate performSelectorOnMainThread:@selector(createApplication:)
                               withObject:nil
                            waitUntilDone:NO];

    // Run the message loop. This will block until Quit() is called.
    result = message_loop->Run();

    // Shut down CEF.
    context->Shutdown();

    // Release objects in reverse order of creation.
#if !__has_feature(objc_arc)
    [delegate release];
#endif  // !__has_feature(objc_arc)
    delegate = nil;
    message_loop.reset();
    context.reset();
  }  // @autoreleasepool

  return result;
}

}  // namespace
}  // namespace client

// Entry point function for the browser process.
int main(int argc, char* argv[]) {
  return client::RunMain(argc, argv);
}