/*
 * Copyright (C) 2016-2020 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "config.h"
#import "TestWKWebView.h"

#import "ClassMethodSwizzler.h"
#import "InstanceMethodSwizzler.h"
#import "TestNavigationDelegate.h"
#import "Utilities.h"

#import <WebKit/WKContentWorld.h>
#import <WebKit/WKWebViewConfigurationPrivate.h>
#import <WebKit/WKWebViewPrivateForTesting.h>
#import <WebKit/WebKitPrivate.h>
#import <WebKit/_WKActivatedElementInfo.h>
#import <WebKit/_WKProcessPoolConfiguration.h>
#import <WebKit/_WKTextInputContext.h>
#import <objc/runtime.h>
#import <wtf/BlockPtr.h>
#import <wtf/RetainPtr.h>

#if PLATFORM(MAC)
#import <AppKit/AppKit.h>
#import <Carbon/Carbon.h>
#endif

#if PLATFORM(IOS_FAMILY)
#import "UIKitSPI.h"
#import <MobileCoreServices/MobileCoreServices.h>
#import <wtf/SoftLinking.h>
SOFT_LINK_FRAMEWORK(UIKit)
SOFT_LINK_CLASS(UIKit, UIWindow)

static NSString *overrideBundleIdentifier(id, SEL)
{
    return @"com.apple.TestWebKitAPI";
}

@implementation WKWebView (WKWebViewTestingQuirks)

// TestWebKitAPI is currently not a UIApplication so we are unable to track if it is in
// the background or not (https://bugs.webkit.org/show_bug.cgi?id=175204). This can
// cause our processes to get suspended on iOS. We work around this by having
// WKWebView._isBackground always return NO in the context of API tests.
- (BOOL)_isBackground
{
    return NO;
}
@end
#endif

@implementation WKWebView (TestWebKitAPI)

- (void)loadTestPageNamed:(NSString *)pageName
{
    NSURLRequest *request = [NSURLRequest requestWithURL:[[NSBundle mainBundle] URLForResource:pageName withExtension:@"html" subdirectory:@"TestWebKitAPI.resources"]];
    [self loadRequest:request];
}

- (void)synchronouslyGoBack
{
    [self goBack];
    [self _test_waitForDidFinishNavigation];
}

- (void)synchronouslyGoForward
{
    [self goForward];
    [self _test_waitForDidFinishNavigation];
}

- (void)synchronouslyLoadRequest:(NSURLRequest *)request
{
    [self loadRequest:request];
    [self _test_waitForDidFinishNavigation];
}

- (void)synchronouslyLoadHTMLString:(NSString *)html baseURL:(NSURL *)url
{
    [self loadHTMLString:html baseURL:url];
    [self _test_waitForDidFinishNavigation];
}

- (void)synchronouslyLoadHTMLString:(NSString *)html
{
    [self synchronouslyLoadHTMLString:html baseURL:[[[NSBundle mainBundle] bundleURL] URLByAppendingPathComponent:@"TestWebKitAPI.resources"]];
}

- (void)synchronouslyLoadHTMLString:(NSString *)html preferences:(WKWebpagePreferences *)preferences
{
    [self loadHTMLString:html baseURL:[[[NSBundle mainBundle] bundleURL] URLByAppendingPathComponent:@"TestWebKitAPI.resources"]];
    [self _test_waitForDidFinishNavigationWithPreferences:preferences];
}

- (void)synchronouslyLoadTestPageNamed:(NSString *)pageName
{
    [self loadTestPageNamed:pageName];
    [self _test_waitForDidFinishNavigation];
}

- (BOOL)_synchronouslyExecuteEditCommand:(NSString *)command argument:(NSString *)argument
{
    __block bool done = false;
    __block bool success;
    [self _executeEditCommand:command argument:argument completion:^(BOOL completionSuccess) {
        done = true;
        success = completionSuccess;
    }];
    TestWebKitAPI::Util::run(&done);
    return success;
}

#if PLATFORM(IOS_FAMILY)

- (UIView <UITextInputPrivate, UITextInputMultiDocument> *)textInputContentView
{
    return (UIView <UITextInputPrivate, UITextInputMultiDocument> *)[self valueForKey:@"_currentContentView"];
}

- (NSArray<_WKTextInputContext *> *)synchronouslyRequestTextInputContextsInRect:(CGRect)rect
{
    __block bool finished = false;
    __block RetainPtr<NSArray<_WKTextInputContext *>> result;
    [self _requestTextInputContextsInRect:rect completionHandler:^(NSArray<_WKTextInputContext *> *contexts) {
        result = contexts;
        finished = true;
    }];
    TestWebKitAPI::Util::run(&finished);
    return result.autorelease();
}

#endif // PLATFORM(IOS_FAMILY)

- (NSUInteger)gpuToWebProcessConnectionCount
{
    __block bool done = false;
    __block NSUInteger count = 0;
    [self _gpuToWebProcessConnectionCountForTesting:^(NSUInteger result) {
        done = true;
        count = result;
    }];
    TestWebKitAPI::Util::run(&done);
    return count;
}

- (NSString *)contentsAsString
{
    __block bool done = false;
    __block RetainPtr<NSString> result;
    [self _getContentsAsStringWithCompletionHandler:^(NSString *contents, NSError *error) {
        result = contents;
        done = true;
    }];
    TestWebKitAPI::Util::run(&done);
    return result.autorelease();
}

- (NSArray<NSString *> *)tagsInBody
{
    return [self objectByEvaluatingJavaScript:@"Array.from(document.body.getElementsByTagName('*')).map(e => e.tagName)"];
}

- (void)expectElementTagsInOrder:(NSArray<NSString *> *)tagNames
{
    auto remainingTags = adoptNS([tagNames mutableCopy]);
    NSArray<NSString *> *tagsInBody = self.tagsInBody;
    for (NSString *tag in tagsInBody.reverseObjectEnumerator) {
        if ([tag isEqualToString:[remainingTags lastObject]])
            [remainingTags removeLastObject];
        if (![remainingTags count])
            break;
    }
    EXPECT_EQ([remainingTags count], 0U);
    if ([remainingTags count])
        NSLog(@"Expected to find ordered tags: %@ in: %@", tagNames, tagsInBody);
}

- (void)expectElementCount:(NSInteger)count querySelector:(NSString *)querySelector
{
    NSString *script = [NSString stringWithFormat:@"document.querySelectorAll('%@').length", querySelector];
    EXPECT_EQ(count, [self stringByEvaluatingJavaScript:script].integerValue);
}

- (void)expectElementTag:(NSString *)tagName toComeBefore:(NSString *)otherTagName
{
    [self expectElementTagsInOrder:@[tagName, otherTagName]];
}

- (BOOL)evaluateMediaQuery:(NSString *)query
{
    return [[self objectByEvaluatingJavaScript:[NSString stringWithFormat:@"window.matchMedia(\"(%@)\").matches", query]] boolValue];
}

- (id)objectByEvaluatingJavaScript:(NSString *)script
{
    bool callbackComplete = false;
    RetainPtr<id> evalResult;
    [self _evaluateJavaScriptWithoutUserGesture:script completionHandler:[&] (id result, NSError *error) {
        evalResult = result;
        callbackComplete = true;
        EXPECT_TRUE(!error);
        if (error)
            NSLog(@"Encountered error: %@ while evaluating script: %@", error, script);
    }];
    TestWebKitAPI::Util::run(&callbackComplete);
    return evalResult.autorelease();
}

- (id)objectByEvaluatingJavaScriptWithUserGesture:(NSString *)script
{
    bool callbackComplete = false;
    RetainPtr<id> evalResult;
    [self evaluateJavaScript:script completionHandler:[&] (id result, NSError *error) {
        evalResult = result;
        callbackComplete = true;
        EXPECT_TRUE(!error);
        if (error)
            NSLog(@"Encountered error: %@ while evaluating script: %@", error, script);
    }];
    TestWebKitAPI::Util::run(&callbackComplete);
    return evalResult.autorelease();
}

- (id)objectByCallingAsyncFunction:(NSString *)script withArguments:(NSDictionary *)arguments error:(NSError **)errorOut
{
    bool callbackComplete = false;
    if (errorOut)
        *errorOut = nil;

    RetainPtr<id> evalResult;
    RetainPtr<NSError> strongError;
    [self callAsyncJavaScript:script arguments:arguments inFrame:nil inContentWorld:WKContentWorld.pageWorld completionHandler:[&] (id result, NSError *error) {
        evalResult = result;
        strongError = error;
        callbackComplete = true;
    }];
    TestWebKitAPI::Util::run(&callbackComplete);

    if (errorOut)
        *errorOut = strongError.autorelease();

    return evalResult.autorelease();
}

- (NSString *)stringByEvaluatingJavaScript:(NSString *)script
{
    return [NSString stringWithFormat:@"%@", [self objectByEvaluatingJavaScript:script]];
}

- (unsigned)waitUntilClientWidthIs:(unsigned)expectedClientWidth
{
    int timeout = 10;
    unsigned clientWidth = 0;
    do {
        if (timeout != 10)
            TestWebKitAPI::Util::sleep(0.1);

        id result = [self objectByEvaluatingJavaScript:@"function ___forceLayoutAndGetClientWidth___() { document.body.offsetTop; return document.body.clientWidth; }; ___forceLayoutAndGetClientWidth___();"];
        clientWidth = [result integerValue];

        --timeout;
    } while (clientWidth != expectedClientWidth && timeout >= 0);

    return clientWidth;
}

@end

@implementation TestMessageHandler {
    NSMutableDictionary<NSString *, dispatch_block_t> *_messageHandlers;
    BlockPtr<void(NSString *)> _wildcardMessageHandler;
}

- (void)addMessage:(NSString *)message withHandler:(dispatch_block_t)handler
{
    if (!_messageHandlers)
        _messageHandlers = [NSMutableDictionary dictionary];

    _messageHandlers[message] = [handler copy];
}

- (void)setWildcardMessageHandler:(void (^)(NSString *))handler
{
    _wildcardMessageHandler = handler;
}

- (void)removeMessage:(NSString *)message
{
    [_messageHandlers removeObjectForKey:message];
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    dispatch_block_t handler = _messageHandlers[message.body];
    if (handler)
        handler();

    if (_wildcardMessageHandler)
        _wildcardMessageHandler(message.body);
}

@end

#if PLATFORM(MAC)
@interface TestWKWebViewHostWindow : NSWindow
#else
@interface TestWKWebViewHostWindow : UIWindow
#endif // PLATFORM(MAC)
@end

@implementation TestWKWebViewHostWindow {
    BOOL _forceKeyWindow;
    __weak TestWKWebView *_webView;
}

#if PLATFORM(MAC)

static int gEventNumber = 1;

NSEventMask __simulated_forceClickAssociatedEventsMask(id self, SEL _cmd)
{
    return NSEventMaskPressure | NSEventMaskLeftMouseDown | NSEventMaskLeftMouseUp | NSEventMaskLeftMouseDragged;
}

- (instancetype)initWithWebView:(TestWKWebView *)webView contentRect:(NSRect)contentRect styleMask:(NSWindowStyleMask)style backing:(NSBackingStoreType)backingStoreType defer:(BOOL)flag
{
    if (self = [super initWithContentRect:contentRect styleMask:style backing:backingStoreType defer:flag])
        _webView = webView;
    return self;
}

- (void)_mouseDownAtPoint:(NSPoint)point simulatePressure:(BOOL)simulatePressure clickCount:(NSUInteger)clickCount modifierFlags:(NSEventModifierFlags)modifierFlags mouseEventType:(NSEventType)mouseEventType
{
    if (simulatePressure)
        modifierFlags |= NSEventMaskPressure;

    NSEvent *event = [NSEvent mouseEventWithType:mouseEventType location:point modifierFlags:modifierFlags timestamp:_webView.eventTimestamp windowNumber:self.windowNumber context:[NSGraphicsContext currentContext] eventNumber:++gEventNumber clickCount:clickCount pressure:simulatePressure];
    if (!simulatePressure) {
        [self sendEvent:event];
        return;
    }

    IMP simulatedAssociatedEventsMaskImpl = (IMP)__simulated_forceClickAssociatedEventsMask;
    Method associatedEventsMaskMethod = class_getInstanceMethod([NSEvent class], @selector(associatedEventsMask));
    IMP originalAssociatedEventsMaskImpl = method_setImplementation(associatedEventsMaskMethod, simulatedAssociatedEventsMaskImpl);
    @try {
        [self sendEvent:event];
    } @finally {
        // In the case where event sending raises an exception, we still want to restore the original implementation
        // to prevent subsequent event sending tests from being affected.
        method_setImplementation(associatedEventsMaskMethod, originalAssociatedEventsMaskImpl);
    }
}

- (void)_mouseUpAtPoint:(NSPoint)point clickCount:(NSUInteger)clickCount modifierFlags:(NSEventModifierFlags)modifierFlags eventType:(NSEventType)eventType
{
    [self sendEvent:[NSEvent mouseEventWithType:eventType location:point modifierFlags:modifierFlags timestamp:_webView.eventTimestamp windowNumber:self.windowNumber context:[NSGraphicsContext currentContext] eventNumber:++gEventNumber clickCount:clickCount pressure:0]];
}

#endif

- (BOOL)isKeyWindow
{
    return _forceKeyWindow || [super isKeyWindow];
}

#if PLATFORM(IOS_FAMILY)

static NeverDestroyed<RetainPtr<UIWindow>> gOverriddenApplicationKeyWindow;
static NeverDestroyed<std::unique_ptr<InstanceMethodSwizzler>> gApplicationKeyWindowSwizzler;
static NeverDestroyed<std::unique_ptr<InstanceMethodSwizzler>> gSharedApplicationSwizzler;

static void setOverriddenApplicationKeyWindow(UIWindow *window)
{
    if (gOverriddenApplicationKeyWindow.get() == window)
        return;

    if (!UIApplication.sharedApplication) {
        InstanceMethodSwizzler bundleIdentifierSwizzler(NSBundle.class, @selector(bundleIdentifier), reinterpret_cast<IMP>(overrideBundleIdentifier));
        UIApplicationInitialize();
        UIApplicationInstantiateSingleton(UIApplication.class);
    }

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        gApplicationKeyWindowSwizzler.get() = makeUnique<InstanceMethodSwizzler>(UIApplication.class, @selector(keyWindow), reinterpret_cast<IMP>(applicationKeyWindowOverride));
    });
    gOverriddenApplicationKeyWindow.get() = window;
}

static UIWindow *applicationKeyWindowOverride(id, SEL)
{
    return gOverriddenApplicationKeyWindow.get().get();
}

- (instancetype)initWithWebView:(TestWKWebView *)webView frame:(CGRect)frame
{
    if (self = [super initWithFrame:frame])
        _webView = webView;
    return self;
}

#endif

- (void)makeKeyWindow
{
    if (_forceKeyWindow)
        return;

    _forceKeyWindow = YES;
#if PLATFORM(MAC)
    [[NSNotificationCenter defaultCenter] postNotificationName:NSWindowDidBecomeKeyNotification object:self];
#else
    setOverriddenApplicationKeyWindow(self);
    [[NSNotificationCenter defaultCenter] postNotificationName:UIWindowDidBecomeKeyNotification object:self];
#endif
}

- (void)resignKeyWindow
{
    _forceKeyWindow = NO;
    [super resignKeyWindow];
}

@end

#if PLATFORM(IOS_FAMILY)

using InputSessionChangeCount = NSUInteger;
static InputSessionChangeCount nextInputSessionChangeCount()
{
    static InputSessionChangeCount gInputSessionChangeCount = 0;
    return ++gInputSessionChangeCount;
}

#endif

@implementation TestWKWebView {
    RetainPtr<TestWKWebViewHostWindow> _hostWindow;
    RetainPtr<TestMessageHandler> _testHandler;
    RetainPtr<WKUserScript> _onloadScript;
#if PLATFORM(IOS_FAMILY)
    std::unique_ptr<ClassMethodSwizzler> _sharedCalloutBarSwizzler;
    InputSessionChangeCount _inputSessionChangeCount;
#endif
#if PLATFORM(MAC)
    NSTimeInterval _eventTimestampOffset;
#endif
}

- (instancetype)initWithFrame:(CGRect)frame
{
    auto defaultConfiguration = adoptNS([[WKWebViewConfiguration alloc] init]);
    return [self initWithFrame:frame configuration:defaultConfiguration.get()];
}

- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration
{
    return [self initWithFrame:frame configuration:configuration addToWindow:YES];
}

#if PLATFORM(IOS_FAMILY)

static UICalloutBar *suppressUICalloutBar()
{
    return nil;
}

#endif

- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration addToWindow:(BOOL)addToWindow
{
    self = [super initWithFrame:frame configuration:configuration];
    if (!self)
        return nil;

    if (addToWindow)
        [self _setUpTestWindow:frame];

#if PLATFORM(IOS_FAMILY)
    // FIXME: Remove this workaround once <https://webkit.org/b/175204> is fixed.
    _sharedCalloutBarSwizzler = makeUnique<ClassMethodSwizzler>([UICalloutBar class], @selector(sharedCalloutBar), reinterpret_cast<IMP>(suppressUICalloutBar));
    _inputSessionChangeCount = 0;
#endif

    return self;
}

- (instancetype)initWithFrame:(CGRect)frame configuration:(WKWebViewConfiguration *)configuration processPoolConfiguration:(_WKProcessPoolConfiguration *)processPoolConfiguration
{
    [configuration setProcessPool:adoptNS([[WKProcessPool alloc] _initWithConfiguration:processPoolConfiguration]).get()];
    return [self initWithFrame:frame configuration:configuration];
}

- (void)_setUpTestWindow:(NSRect)frame
{
#if PLATFORM(MAC)
    _hostWindow = adoptNS([[TestWKWebViewHostWindow alloc] initWithWebView:self contentRect:frame styleMask:(NSWindowStyleMaskBorderless | NSWindowStyleMaskMiniaturizable) backing:NSBackingStoreBuffered defer:NO]);
    [_hostWindow setFrameOrigin:frame.origin];
    [_hostWindow setIsVisible:YES];
    [_hostWindow contentView].wantsLayer = YES;
    [[_hostWindow contentView] addSubview:self];
    [_hostWindow makeKeyAndOrderFront:self];
#else
    _hostWindow = adoptNS([[TestWKWebViewHostWindow alloc] initWithWebView:self frame:frame]);
    [_hostWindow setHidden:NO];
    [_hostWindow addSubview:self];
#endif
}

- (void)addToTestWindow
{
#if PLATFORM(MAC)
    [[_hostWindow contentView] addSubview:self];
#else
    [_hostWindow addSubview:self];
#endif
}

- (void)clearMessageHandlers:(NSArray *)messageNames
{
    for (NSString *messageName in messageNames)
        [_testHandler removeMessage:messageName];
}

- (void)performAfterReceivingMessage:(NSString *)message action:(dispatch_block_t)action
{
    if (!_testHandler) {
        _testHandler = adoptNS([[TestMessageHandler alloc] init]);
        [[[self configuration] userContentController] addScriptMessageHandler:_testHandler.get() name:@"testHandler"];
    }

    [_testHandler addMessage:message withHandler:action];
}

- (void)performAfterReceivingAnyMessage:(void (^)(NSString *))action
{
    if (!_testHandler) {
        _testHandler = adoptNS([[TestMessageHandler alloc] init]);
        [[[self configuration] userContentController] addScriptMessageHandler:_testHandler.get() name:@"testHandler"];
    }
    [_testHandler setWildcardMessageHandler:action];
}

- (void)synchronouslyLoadHTMLStringAndWaitUntilAllImmediateChildFramesPaint:(NSString *)html
{
    bool didFireDOMLoadEvent = false;
    [self performAfterLoading:[&] { didFireDOMLoadEvent = true; }];
    [self loadHTMLString:html baseURL:[NSBundle.mainBundle.bundleURL URLByAppendingPathComponent:@"TestWebKitAPI.resources"]];
    TestWebKitAPI::Util::run(&didFireDOMLoadEvent);
    [self waitForNextPresentationUpdate];
}

- (void)waitForMessage:(NSString *)message
{
    __block bool isDoneWaiting = false;
    [self performAfterReceivingMessage:message action:^()
    {
        isDoneWaiting = true;
    }];
    TestWebKitAPI::Util::run(&isDoneWaiting);
}

- (void)performAfterLoading:(dispatch_block_t)actions
{
    NSString *const viewDidLoadMessage = @"TestWKWebViewDidLoad";
    if (!_onloadScript) {
        NSString *onloadScript = [NSString stringWithFormat:@"window.addEventListener('load', () => window.webkit.messageHandlers.testHandler.postMessage('%@'), true /* useCapture */)", viewDidLoadMessage];
        _onloadScript = adoptNS([[WKUserScript alloc] initWithSource:onloadScript injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:YES]);
        [self.configuration.userContentController addUserScript:_onloadScript.get()];
    }
    [self performAfterReceivingMessage:viewDidLoadMessage action:actions];
}

- (void)waitForNextPresentationUpdate
{
    __block bool done = false;
    [self _doAfterNextPresentationUpdate:^() {
        done = true;
    }];

    TestWebKitAPI::Util::run(&done);
}

- (void)waitUntilActivityStateUpdateDone
{
    __block bool done = false;
    [self _doAfterActivityStateUpdate:^() {
        done = true;
    }];

    TestWebKitAPI::Util::run(&done);
}

- (void)forceDarkMode
{
#if HAVE(OS_DARK_MODE_SUPPORT)
#if USE(APPKIT)
    [self setAppearance:[NSAppearance appearanceNamed:NSAppearanceNameDarkAqua]];
#else
    [self setOverrideUserInterfaceStyle:UIUserInterfaceStyleDark];
#endif
#endif
}

- (NSString *)stylePropertyAtSelectionStart:(NSString *)propertyName
{
    NSString *script = [NSString stringWithFormat:@"getComputedStyle(getSelection().getRangeAt(0).startContainer.parentElement)['%@']", propertyName];
    return [self stringByEvaluatingJavaScript:script];
}

- (NSString *)stylePropertyAtSelectionEnd:(NSString *)propertyName
{
    NSString *script = [NSString stringWithFormat:@"getComputedStyle(getSelection().getRangeAt(0).endContainer.parentElement)['%@']", propertyName];
    return [self stringByEvaluatingJavaScript:script];
}

- (void)collapseToStart
{
    [self evaluateJavaScript:@"getSelection().collapseToStart()" completionHandler:nil];
}

- (void)collapseToEnd
{
    [self evaluateJavaScript:@"getSelection().collapseToEnd()" completionHandler:nil];
}

- (BOOL)selectionRangeHasStartOffset:(int)start endOffset:(int)end
{
    __block bool isDone = false;
    __block bool matches = true;
    [self evaluateJavaScript:@"window.getSelection().getRangeAt(0).startOffset" completionHandler:^(id result, NSError *error) {
        if ([(NSNumber *)result intValue] != start)
            matches = false;
    }];
    [self evaluateJavaScript:@"window.getSelection().getRangeAt(0).endOffset" completionHandler:^(id result, NSError *error) {
        if ([(NSNumber *)result intValue] != end)
            matches = false;
        isDone = true;
    }];
    TestWebKitAPI::Util::run(&isDone);

    return matches;
}

- (void)clickOnElementID:(NSString *)elementID
{
    [self evaluateJavaScript:[NSString stringWithFormat:@"document.getElementById('%@').click();", elementID] completionHandler:nil];
}

- (void)waitForPendingMouseEvents
{
    __block bool doneProcessingMouseEvents = false;
    [self _doAfterProcessingAllPendingMouseEvents:^{
        doneProcessingMouseEvents = true;
    }];
    TestWebKitAPI::Util::run(&doneProcessingMouseEvents);
}

- (void)focus
{
#if PLATFORM(MAC)
    [_hostWindow makeFirstResponder:self];
#else
    [super becomeFirstResponder];
#endif
}

#if PLATFORM(IOS_FAMILY)

- (void)didStartFormControlInteraction
{
    _inputSessionChangeCount = nextInputSessionChangeCount();
}

- (void)didEndFormControlInteraction
{
    _inputSessionChangeCount = 0;
}

#endif // PLATFORM(IOS_FAMILY)

@end

#if PLATFORM(IOS_FAMILY)

@implementation TestWKWebView (IOSOnly)

- (void)evaluateJavaScriptAndWaitForInputSessionToChange:(NSString *)script
{
    auto initialChangeCount = _inputSessionChangeCount;
    BOOL hasEmittedWarning = NO;
    NSTimeInterval secondsToWaitUntilWarning = 2;
    NSTimeInterval startTime = [NSDate timeIntervalSinceReferenceDate];

    [self objectByEvaluatingJavaScript:script];
    while ([[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantPast]]) {
        if (_inputSessionChangeCount != initialChangeCount)
            break;

        if (hasEmittedWarning || startTime + secondsToWaitUntilWarning >= [NSDate timeIntervalSinceReferenceDate])
            continue;

        NSLog(@"Warning: expecting input session change count to differ from %lu", static_cast<unsigned long>(initialChangeCount));
        hasEmittedWarning = YES;
    }
}

- (RetainPtr<NSArray>)selectionRectsAfterPresentationUpdate
{
    RetainPtr<TestWKWebView> retainedSelf = self;

    __block bool isDone = false;
    __block RetainPtr<NSArray> selectionRects;
    [self _doAfterNextPresentationUpdate:^() {
        selectionRects = [retainedSelf _uiTextSelectionRects];
        isDone = true;
    }];

    TestWebKitAPI::Util::run(&isDone);
    return selectionRects;
}

- (CGRect)caretViewRectInContentCoordinates
{
    UIView *selectionView = [self.textInputContentView valueForKeyPath:@"interactionAssistant.selectionView"];
    CGRect caretFrame = [[selectionView valueForKeyPath:@"caretView.frame"] CGRectValue];
    return [selectionView convertRect:caretFrame toView:self.textInputContentView];
}

- (NSArray<NSValue *> *)selectionViewRectsInContentCoordinates
{
    NSMutableArray *selectionRects = [NSMutableArray array];
    NSArray<UITextSelectionRect *> *rects = [self.textInputContentView valueForKeyPath:@"interactionAssistant.selectionView.rangeView.rects"];
    for (UITextSelectionRect *rect in rects)
        [selectionRects addObject:[NSValue valueWithCGRect:rect.rect]];
    return selectionRects;
}

- (_WKActivatedElementInfo *)activatedElementAtPosition:(CGPoint)position
{
    __block RetainPtr<_WKActivatedElementInfo> info;
    __block bool finished = false;
    [self _requestActivatedElementAtPosition:position completionBlock:^(_WKActivatedElementInfo *elementInfo) {
        info = elementInfo;
        finished = true;
    }];

    TestWebKitAPI::Util::run(&finished);
    return info.autorelease();
}

static WKContentView *recursiveFindWKContentView(UIView *view)
{
    if ([view isKindOfClass:NSClassFromString(@"WKContentView")])
        return (WKContentView *)view;

    for (UIView *subview in view.subviews) {
        WKContentView *contentView = recursiveFindWKContentView(subview);
        if (contentView)
            return contentView;
    }

    return nil;
}

- (WKContentView *)wkContentView
{
    return recursiveFindWKContentView(self);
}

@end

#endif

#if PLATFORM(MAC)

@implementation TestWKWebView (MacOnly)

- (void)setEventTimestampOffset:(NSTimeInterval)offset
{
    _eventTimestampOffset += offset;
}

- (NSTimeInterval)eventTimestamp
{
    return GetCurrentEventTime() + _eventTimestampOffset;
}

- (void)mouseDownAtPoint:(NSPoint)pointInWindow simulatePressure:(BOOL)simulatePressure
{
    [self mouseDownAtPoint:pointInWindow simulatePressure:simulatePressure withFlags:0 eventType:NSEventTypeLeftMouseDown];
}

- (void)mouseDownAtPoint:(NSPoint)pointInWindow simulatePressure:(BOOL)simulatePressure withFlags:(NSEventModifierFlags)flags eventType:(NSEventType)eventType
{
    [_hostWindow _mouseDownAtPoint:pointInWindow simulatePressure:simulatePressure clickCount:1 modifierFlags:flags mouseEventType:eventType];
}

- (void)mouseUpAtPoint:(NSPoint)pointInWindow
{
    [self mouseUpAtPoint:pointInWindow withFlags:0 eventType:NSEventTypeLeftMouseUp];
}

- (void)mouseUpAtPoint:(NSPoint)pointInWindow withFlags:(NSEventModifierFlags)flags eventType:(NSEventType)eventType
{
    [_hostWindow _mouseUpAtPoint:pointInWindow clickCount:1 modifierFlags:flags eventType:eventType];
}

- (void)mouseMoveToPoint:(NSPoint)pointInWindow withFlags:(NSEventModifierFlags)flags
{
    [self mouseMoved:[self _mouseEventWithType:NSEventTypeMouseMoved atLocation:pointInWindow flags:flags timestamp:self.eventTimestamp clickCount:0]];
}

- (void)sendClicksAtPoint:(NSPoint)pointInWindow numberOfClicks:(NSUInteger)numberOfClicks
{
    for (NSUInteger clickCount = 1; clickCount <= numberOfClicks; ++clickCount) {
        [_hostWindow _mouseDownAtPoint:pointInWindow simulatePressure:NO clickCount:clickCount modifierFlags:0 mouseEventType:NSEventTypeLeftMouseDown];
        [_hostWindow _mouseUpAtPoint:pointInWindow clickCount:clickCount modifierFlags:0 eventType:NSEventTypeLeftMouseUp];
    }
}

- (void)sendClickAtPoint:(NSPoint)pointInWindow
{
    [self sendClicksAtPoint:pointInWindow numberOfClicks:1];
}

- (void)mouseEnterAtPoint:(NSPoint)pointInWindow
{
    [self mouseEntered:[self _mouseEventWithType:NSEventTypeMouseEntered atLocation:pointInWindow]];
}

- (void)mouseDragToPoint:(NSPoint)pointInWindow
{
    [self mouseDragged:[self _mouseEventWithType:NSEventTypeLeftMouseDragged atLocation:pointInWindow]];
}

- (NSEvent *)_mouseEventWithType:(NSEventType)type atLocation:(NSPoint)pointInWindow
{
    return [self _mouseEventWithType:type atLocation:pointInWindow flags:0 timestamp:self.eventTimestamp clickCount:0];
}

- (NSEvent *)_mouseEventWithType:(NSEventType)type atLocation:(NSPoint)locationInWindow flags:(NSEventModifierFlags)flags timestamp:(NSTimeInterval)timestamp clickCount:(NSUInteger)clickCount
{
    switch (type) {
    case NSEventTypeMouseEntered:
    case NSEventTypeMouseExited:
        return [NSEvent enterExitEventWithType:type location:locationInWindow modifierFlags:flags timestamp:timestamp windowNumber:[_hostWindow windowNumber] context:[NSGraphicsContext currentContext] eventNumber:++gEventNumber trackingNumber:1 userData:nil];
    default:
        return [NSEvent mouseEventWithType:type location:locationInWindow modifierFlags:flags timestamp:timestamp windowNumber:[_hostWindow windowNumber] context:[NSGraphicsContext currentContext] eventNumber:++gEventNumber clickCount:clickCount pressure:0];
    }
}

- (void)wheelEventAtPoint:(CGPoint)pointInWindow wheelDelta:(CGSize)delta
{
    RetainPtr<CGEventRef> cgScrollEvent = adoptCF(CGEventCreateScrollWheelEvent(nullptr, kCGScrollEventUnitPixel, 2, delta.height, delta.width, 0));

    CGPoint locationInGlobalScreenCoordinates = [[self window] convertPointToScreen:pointInWindow];
    locationInGlobalScreenCoordinates.y = [[[NSScreen screens] objectAtIndex:0] frame].size.height - locationInGlobalScreenCoordinates.y;
    CGEventSetLocation(cgScrollEvent.get(), locationInGlobalScreenCoordinates);
    
    NSEvent* event = [NSEvent eventWithCGEvent:cgScrollEvent.get()];
    [self scrollWheel:event];
}

- (NSWindow *)hostWindow
{
    return _hostWindow.get();
}

- (void)typeCharacter:(char)character
{
    [self typeCharacter:character modifiers:0];
}

- (void)typeCharacter:(char)character modifiers:(NSEventModifierFlags)modifiers
{
    NSString *characterAsString = [NSString stringWithFormat:@"%c" , character];
    NSEventType keyDownEventType = NSEventTypeKeyDown;
    NSEventType keyUpEventType = NSEventTypeKeyUp;
    [self keyDown:[NSEvent keyEventWithType:keyDownEventType location:NSZeroPoint modifierFlags:modifiers timestamp:self.eventTimestamp windowNumber:[_hostWindow windowNumber] context:nil characters:characterAsString charactersIgnoringModifiers:characterAsString isARepeat:NO keyCode:character]];
    [self keyUp:[NSEvent keyEventWithType:keyUpEventType location:NSZeroPoint modifierFlags:modifiers timestamp:self.eventTimestamp windowNumber:[_hostWindow windowNumber] context:nil characters:characterAsString charactersIgnoringModifiers:characterAsString isARepeat:NO keyCode:character]];
}

@end

#endif // PLATFORM(MAC)

#if PLATFORM(IOS_FAMILY)
@implementation UIView (WKTestingUIViewUtilities)

- (UIView *)wkFirstSubviewWithClass:(Class)targetClass
{
    for (UIView *view in self.subviews) {
        if ([view isKindOfClass:targetClass])
            return view;
    
        UIView *foundSubview = [view wkFirstSubviewWithClass:targetClass];
        if (foundSubview)
            return foundSubview;
    }
    
    return nil;
}

- (UIView *)wkFirstSubviewWithBoundsSize:(CGSize)size
{
    for (UIView *view in self.subviews) {
        if (CGSizeEqualToSize([view bounds].size, size))
            return view;
    
        UIView *foundSubview = [view wkFirstSubviewWithBoundsSize:size];
        if (foundSubview)
            return foundSubview;
    }
    
    return nil;
}

@end

#endif // PLATFORM(IOS_FAMILY)