// 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 "cefclient/client_app.h"
#include "cefclient/client_switches.h"
#include "cefclient/main_context_impl.h"
#include "cefclient/main_message_loop_std.h"
#include "cefclient/resource.h"
#include "cefclient/root_window.h"
#include "cefclient/test_runner.h"

namespace {

void AddMenuItem(NSMenu *menu, NSString* label, int idval) {
  NSMenuItem* item = [menu addItemWithTitle:label
                                     action:@selector(menuItemSelected:)
                              keyEquivalent:@""];
  [item setTag:idval];
}

}  // 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;
- (IBAction)menuItemSelected:(id)sender;
@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.
}
@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];
  [NSBundle loadNibNamed:@"MainMenu" owner:NSApp];

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

  // Add the Tests menu.
  NSMenu* menubar = [application mainMenu];
  NSMenuItem *testItem = [[[NSMenuItem alloc] initWithTitle:@"Tests"
                                                     action:nil
                                              keyEquivalent:@""] autorelease];
  NSMenu *testMenu = [[[NSMenu alloc] initWithTitle:@"Tests"] autorelease];
  AddMenuItem(testMenu, @"Get Text",      ID_TESTS_GETSOURCE);
  AddMenuItem(testMenu, @"Get Source",    ID_TESTS_GETTEXT);
  AddMenuItem(testMenu, @"Popup Window",  ID_TESTS_POPUP);
  AddMenuItem(testMenu, @"Request",       ID_TESTS_REQUEST);
  AddMenuItem(testMenu, @"Plugin Info",   ID_TESTS_PLUGIN_INFO);
  AddMenuItem(testMenu, @"Zoom In",       ID_TESTS_ZOOM_IN);
  AddMenuItem(testMenu, @"Zoom Out",      ID_TESTS_ZOOM_OUT);
  AddMenuItem(testMenu, @"Zoom Reset",    ID_TESTS_ZOOM_RESET);
  AddMenuItem(testMenu, @"Begin Tracing", ID_TESTS_TRACING_BEGIN);
  AddMenuItem(testMenu, @"End Tracing",   ID_TESTS_TRACING_END);
  AddMenuItem(testMenu, @"Print",         ID_TESTS_PRINT);
  AddMenuItem(testMenu, @"Other Tests",   ID_TESTS_OTHER_TESTS);
  [testItem setSubmenu:testMenu];
  [menubar addItem:testItem];

  // Create the first window.
  client::MainContext::Get()->GetRootWindowManager()->CreateRootWindow(
      true,             // Show controls.
      with_osr_,        // Use off-screen rendering.
      CefRect(),        // Use default system size.
      std::string());   // Use default URL.
}

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

- (IBAction)menuItemSelected:(id)sender {
  // Retrieve the active RootWindow.
  NSWindow* key_window = [[NSApplication sharedApplication] keyWindow];
  if (!key_window)
    return;

  scoped_refptr<client::RootWindow> root_window =
      client::RootWindow::GetForNSWindow(key_window);

  CefRefPtr<CefBrowser> browser = root_window->GetBrowser();
  if (browser.get()) {
    NSMenuItem *item = (NSMenuItem*)sender;
    client::test_runner::RunTest(browser, [item tag]);
  }
}

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

@end


namespace client {
namespace {

int RunMain(int argc, char* argv[]) {
  CefMainArgs main_args(argc, argv);
  CefRefPtr<ClientApp> app(new ClientApp);

  // Initialize the AutoRelease pool.
  NSAutoreleasePool* autopool = [[NSAutoreleasePool alloc] init];

  // Initialize the ClientApplication instance.
  [ClientApplication sharedApplication];

  // Create the main context object.
  scoped_ptr<MainContextImpl> context(new MainContextImpl(argc, argv, true));

  CefSettings settings;

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

  // Create the main message loop object.
  scoped_ptr<MainMessageLoop> message_loop(new MainMessageLoopStd);

  // Initialize CEF.
  context->Initialize(main_args, settings, app.get(), NULL);

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

  // Create the application delegate and window.
  ClientAppDelegate* delegate = [[ClientAppDelegate alloc]
      initWithOsr:settings.windowless_rendering_enabled ? true : false];
  [delegate performSelectorOnMainThread:@selector(createApplication:)
                             withObject:nil
                          waitUntilDone:NO];

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

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

  // Release objects in reverse order of creation.
  [delegate release];
  message_loop.reset();
  context.reset();
  [autopool release];

  return result;
}

}  // namespace
}  // namespace client


// Program entry point function.
int main(int argc, char* argv[]) {
  return client::RunMain(argc, argv);
}