// Copyright 2015 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 "ui/base/test/scoped_fake_nswindow_focus.h"

#import <Cocoa/Cocoa.h>

#import "base/mac/foundation_util.h"
#import "base/mac/scoped_objc_class_swizzler.h"

using base::mac::ScopedObjCClassSwizzler;

namespace {

NSWindow* g_fake_focused_window = nil;

void SetFocus(NSWindow* window) {
  g_fake_focused_window = window;
  [[NSNotificationCenter defaultCenter]
      postNotificationName:NSWindowDidBecomeMainNotification
                    object:g_fake_focused_window];
  [[NSNotificationCenter defaultCenter]
      postNotificationName:NSWindowDidBecomeKeyNotification
                    object:g_fake_focused_window];
}

void ClearFocus() {
  NSWindow* window = g_fake_focused_window;
  g_fake_focused_window = nil;
  [[NSNotificationCenter defaultCenter]
      postNotificationName:NSWindowDidResignKeyNotification
                    object:window];

  [[NSNotificationCenter defaultCenter]
      postNotificationName:NSWindowDidResignMainNotification
                    object:window];
}

}  // namespace

// Donates testing implementations of NSWindow methods.
@interface FakeNSWindowFocusDonor : NSObject
@end

@implementation FakeNSWindowFocusDonor

- (BOOL)isKeyWindow {
  NSWindow* selfAsWindow = base::mac::ObjCCastStrict<NSWindow>(self);
  return selfAsWindow == g_fake_focused_window;
}

- (BOOL)isMainWindow {
  NSWindow* selfAsWindow = base::mac::ObjCCastStrict<NSWindow>(self);
  return selfAsWindow == g_fake_focused_window;
}

- (void)makeKeyWindow {
  NSWindow* selfAsWindow = base::mac::ObjCCastStrict<NSWindow>(self);
  if (selfAsWindow == g_fake_focused_window ||
      ![selfAsWindow canBecomeKeyWindow])
    return;

  ClearFocus();
  SetFocus(selfAsWindow);
}

- (void)makeMainWindow {
  [self makeKeyWindow];
}

@end

namespace ui {
namespace test {

ScopedFakeNSWindowFocus::ScopedFakeNSWindowFocus()
    : is_main_swizzler_(
          new ScopedObjCClassSwizzler([NSWindow class],
                                      [FakeNSWindowFocusDonor class],
                                      @selector(isMainWindow))),
      make_main_swizzler_(
          new ScopedObjCClassSwizzler([NSWindow class],
                                      [FakeNSWindowFocusDonor class],
                                      @selector(makeMainWindow))),
      is_key_swizzler_(
          new ScopedObjCClassSwizzler([NSWindow class],
                                      [FakeNSWindowFocusDonor class],
                                      @selector(isKeyWindow))),
      make_key_swizzler_(
          new ScopedObjCClassSwizzler([NSWindow class],
                                      [FakeNSWindowFocusDonor class],
                                      @selector(makeKeyWindow))) {}

ScopedFakeNSWindowFocus::~ScopedFakeNSWindowFocus() {
  ClearFocus();
}

}  // namespace test
}  // namespace ui