/*
 * Copyright (C) 2008-2017 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. ``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
 * 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. 
 */

#if USE(PLUGIN_HOST_PROCESS) && ENABLE(NETSCAPE_PLUGIN_API)

#import "WebHostedNetscapePluginView.h"

#import "HostedNetscapePluginStream.h"
#import "NetscapePluginHostManager.h"
#import "NetscapePluginHostProxy.h"
#import "NetscapePluginInstanceProxy.h"
#import "WebFrameInternal.h"
#import "WebTextInputWindowController.h"
#import "WebUIDelegate.h"
#import "WebView.h"
#import "WebViewInternal.h"

#import <CoreFoundation/CoreFoundation.h>
#import <JavaScriptCore/InitializeThreading.h>
#import <WebCore/BridgeJSC.h>
#import <WebCore/Frame.h>
#import <WebCore/FrameLoaderTypes.h>
#import <WebCore/FrameView.h>
#import <WebCore/HTMLPlugInElement.h>
#import <WebCore/RenderEmbeddedObject.h>
#import <WebCore/ResourceError.h>
#import <WebCore/WebCoreCALayerExtras.h>
#import <WebCore/runtime_root.h>
#import <pal/spi/cocoa/QuartzCoreSPI.h>
#import <wtf/Assertions.h>
#import <wtf/MainThread.h>
#import <wtf/RunLoop.h>

using namespace WebCore;
using namespace WebKit;

namespace WebKit {
    
class SoftwareCARenderer {
    WTF_MAKE_FAST_ALLOCATED;
public:
    explicit SoftwareCARenderer(uint32_t contextID)
        : m_context { [CAContext localContext] }
        , m_renderContext { CARenderCGNew(0) }
    {
        [m_context setLayer:[CALayer _web_renderLayerWithContextID:contextID]];
    }

    ~SoftwareCARenderer()
    {
        CARenderCGDestroy(m_renderContext);
    }

    void render(CGContextRef context, CGRect rect)
    {
        CARenderUpdate* update = CARenderUpdateBegin(nullptr, 0, CACurrentMediaTime(), nullptr, 0, &rect);
        CARenderUpdateAddContext(update, [m_context renderContext]);
        CARenderUpdateAddRect(update, &rect);
        CARenderCGRender(m_renderContext, update, context);
        CARenderUpdateFinish(update);
    }

private:
    RetainPtr<CAContext> m_context;
    CARenderCGContext* m_renderContext;
};

}

extern "C" {
#import "WebKitPluginClientServer.h"
#import "WebKitPluginHost.h"
}

#if HAVE(OUT_OF_PROCESS_LAYER_HOSTING)
@interface NSWindow (Details)
- (BOOL)_hostsLayersInWindowServer;
@end
#endif

@implementation WebHostedNetscapePluginView

+ (void)initialize
{
#if !PLATFORM(IOS_FAMILY)
    JSC::initialize();
    WTF::initializeMainThread();
#endif
    sendUserChangeNotifications();
}

- (id)initWithFrame:(NSRect)frame
      pluginPackage:(WebNetscapePluginPackage *)pluginPackage
                URL:(NSURL *)URL
            baseURL:(NSURL *)baseURL
           MIMEType:(NSString *)MIME
      attributeKeys:(NSArray *)keys
    attributeValues:(NSArray *)values
       loadManually:(BOOL)loadManually
            element:(RefPtr<WebCore::HTMLPlugInElement>&&)element
{
    self = [super initWithFrame:frame pluginPackage:pluginPackage URL:URL baseURL:baseURL MIMEType:MIME attributeKeys:keys attributeValues:values loadManually:loadManually element:WTFMove(element)];
    if (!self)
        return nil;
    
    return self;
}    

- (void)handleMouseMoved:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseMoved);
}

- (void)setAttributeKeys:(NSArray *)keys andValues:(NSArray *)values
{
    ASSERT(!_attributeKeys);
    ASSERT(!_attributeValues);
    
    _attributeKeys = adoptNS([keys copy]);
    _attributeValues = adoptNS([values copy]);
}

- (BOOL)windowHostsLayersInWindowServer
{
#if HAVE(OUT_OF_PROCESS_LAYER_HOSTING)
    return [[[self webView] window] _hostsLayersInWindowServer];
#else
    return false;
#endif
}

- (BOOL)createPlugin
{
    ASSERT(!_proxy);

    NSString *userAgent = [[self webView] userAgentForURL:_baseURL.get()];
    BOOL acceleratedCompositingEnabled = false;
    acceleratedCompositingEnabled = [[[self webView] preferences] acceleratedCompositingEnabled];
    _hostsLayersInWindowServer = [self windowHostsLayersInWindowServer];

    _proxy = NetscapePluginHostManager::singleton().instantiatePlugin([_pluginPackage.get() path], [_pluginPackage.get() pluginHostArchitecture], [_pluginPackage.get() bundleIdentifier], self, _MIMEType.get(), _attributeKeys.get(), _attributeValues.get(), userAgent, _sourceURL.get(),
                                                                   _mode == NP_FULL, _isPrivateBrowsingEnabled, acceleratedCompositingEnabled, _hostsLayersInWindowServer);
    if (!_proxy) 
        return NO;

    if (_proxy->rendererType() == UseSoftwareRenderer)
        _softwareRenderer = makeUnique<SoftwareCARenderer>(_proxy->renderContextID());
    else
        [self createPluginLayer];
    
    // Update the window frame.
    _proxy->windowFrameChanged([[self window] frame]);
    
    return YES;
}

- (void)createPluginLayer
{
    BOOL acceleratedCompositingEnabled = false;
    acceleratedCompositingEnabled = [[[self webView] preferences] acceleratedCompositingEnabled];

    _pluginLayer = [CALayer _web_renderLayerWithContextID:_proxy->renderContextID()];

    if (acceleratedCompositingEnabled && _proxy->rendererType() == UseAcceleratedCompositing) {
        // FIXME: This code can be shared between WebHostedNetscapePluginView and WebNetscapePluginView.
        // Since this layer isn't going to be inserted into a view, we need to create another layer and flip its geometry
        // in order to get the coordinate system right.
        RetainPtr<CALayer> realPluginLayer = WTFMove(_pluginLayer);

        _pluginLayer = adoptNS([[CALayer alloc] init]);
        _pluginLayer.get().bounds = realPluginLayer.get().bounds;
        _pluginLayer.get().geometryFlipped = YES;

        realPluginLayer.get().autoresizingMask = kCALayerWidthSizable | kCALayerHeightSizable;
        [_pluginLayer.get() addSublayer:realPluginLayer.get()];

        // Eagerly enter compositing mode, since we know we'll need it. This avoids firing setNeedsStyleRecalc()
        // for iframes that contain composited plugins at bad times. https://bugs.webkit.org/show_bug.cgi?id=39033
        core([self webFrame])->view()->enterCompositingMode();
        [self element]->invalidateStyleAndLayerComposition();
    } else
        self.wantsLayer = YES;
}

- (void)setHostsLayersInWindowServer:(bool)hostsLayersInWindowServer
{
    if (_proxy->rendererType() == UseSoftwareRenderer)
        return;

    RetainPtr<CALayer> currentSuperlayer = [_pluginLayer superlayer];

    _hostsLayersInWindowServer = hostsLayersInWindowServer;

    [self createPluginLayer];
    [self setLayer:currentSuperlayer.get()];
}

// FIXME: This method is an ideal candidate to move up to the base class
- (CALayer *)pluginLayer
{
    return _pluginLayer.get();
}

- (BOOL)getFormValue:(NSString **)value
{
    // FIXME: We cannot implement this method for now because NPP_GetValue
    // is not currently exposed by the plugin host. Once we have an IPC routine
    // which allows us to invoke NPP_GetValue, we could implement this method.
    return false;
}

- (void)setLayer:(CALayer *)newLayer
{
    // FIXME: This should use the same implementation as WebNetscapePluginView (and move to the base class).
    [super setLayer:newLayer];
    
    if (_pluginLayer)
        [newLayer addSublayer:_pluginLayer.get()];
}

- (void)privateBrowsingModeDidChange
{
    if (_proxy)
        _proxy->privateBrowsingModeDidChange(_isPrivateBrowsingEnabled);
}

- (void)loadStream
{
}

- (void)updateAndSetWindow
{
    if (!_proxy)
        return;
    
    // The base coordinates of a window and it's contentView happen to be the equal at a userSpaceScaleFactor
    // of 1. For non-1.0 scale factors this assumption is false.
    NSView *windowContentView = [[self window] contentView];
    NSRect boundsInWindow = [self convertRect:[self bounds] toView:windowContentView];

    NSRect visibleRectInWindow;
    
    // Core Animation plug-ins need to be updated (with a 0,0,0,0 clipRect) when
    // moved to a background tab. We don't do this for Core Graphics plug-ins as
    // older versions of Flash have historical WebKit-specific code that isn't
    // compatible with this behavior.    
    BOOL shouldClipOutPlugin = _pluginLayer && [self shouldClipOutPlugin];
    if (!shouldClipOutPlugin)
        visibleRectInWindow = [self actualVisibleRectInWindow];
    else
        visibleRectInWindow = NSZeroRect;
    
    // Flip Y to convert NSWindow coordinates to top-left-based window coordinates.
    float borderViewHeight = [[self currentWindow] frame].size.height;
    boundsInWindow.origin.y = borderViewHeight - NSMaxY(boundsInWindow);
        
    if (!shouldClipOutPlugin)
        visibleRectInWindow.origin.y = borderViewHeight - NSMaxY(visibleRectInWindow);

    _previousSize = boundsInWindow.size;
    
    _proxy->resize(boundsInWindow, visibleRectInWindow);

    bool shouldHostLayersInWindowServer = [self windowHostsLayersInWindowServer];
    if (_hostsLayersInWindowServer != shouldHostLayersInWindowServer)
        _proxy->setShouldHostLayersInWindowServer(shouldHostLayersInWindowServer);
}

- (void)windowFocusChanged:(BOOL)hasFocus
{
    if (_proxy)
        _proxy->windowFocusChanged(hasFocus);
}

- (BOOL)shouldStop
{
    if (!_proxy)
        return YES;
    
    return _proxy->shouldStop();
}

- (void)destroyPlugin
{
    if (_proxy) {
        _softwareRenderer = nullptr;
        _proxy->destroy();
        _proxy = nullptr;
    }
    
    _pluginLayer = 0;
}

- (void)startTimers
{
    if (_proxy)
        _proxy->startTimers(_isCompletelyObscured);
}

- (void)stopTimers
{
    if (_proxy)
        _proxy->stopTimers();
}

- (void)focusChanged
{
    if (_proxy)
        _proxy->focusChanged(_hasFocus);
}

- (void)windowFrameDidChange:(NSNotification *)notification 
{
    if (_proxy && [self window])
        _proxy->windowFrameChanged([[self window] frame]);
}

- (void)addWindowObservers
{
    [super addWindowObservers];
    
    ASSERT([self window]);
    
    NSWindow *window = [self window];
    
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    [notificationCenter addObserver:self selector:@selector(windowFrameDidChange:) 
                               name:NSWindowDidMoveNotification object:window];
    [notificationCenter addObserver:self selector:@selector(windowFrameDidChange:)
                               name:NSWindowDidResizeNotification object:window];    

    if (_proxy)
        _proxy->windowFrameChanged([window frame]);
    [self updateAndSetWindow];
}

- (void)removeWindowObservers
{
    [super removeWindowObservers];
    
    NSNotificationCenter *notificationCenter = [NSNotificationCenter defaultCenter];
    [notificationCenter removeObserver:self name:NSWindowDidMoveNotification object:nil];
    [notificationCenter removeObserver:self name:NSWindowDidResizeNotification object:nil];
}

- (void)mouseDown:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseDown);
}

- (void)mouseUp:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseUp);
}

- (void)mouseDragged:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseDragged);
}

- (void)handleMouseEntered:(NSEvent *)event
{
    // Set cursor to arrow. Plugins often handle cursor internally, but those that don't will just get this default one.
    [[NSCursor arrowCursor] set];

    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseEntered);
}

- (void)handleMouseExited:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->mouseEvent(self, event, NPCocoaEventMouseExited);

    // Set cursor back to arrow cursor.  Because NSCursor doesn't know about changes that the plugin made, we could get confused about what we think the
    // current cursor is otherwise.  Therefore we have no choice but to unconditionally reset the cursor when the mouse exits the plugin.
    // FIXME: This should be job of plugin host, see <rdar://problem/7654434>.
    [[NSCursor arrowCursor] set];
}

- (void)scrollWheel:(NSEvent *)event
{
    bool processedEvent = false;
    
    if (_isStarted && _proxy)
        processedEvent = _proxy->wheelEvent(self, event);
    
    if (!processedEvent)
        [super scrollWheel:event];
}

- (NSTextInputContext *)inputContext
{
    return [[WebTextInputWindowController sharedTextInputWindowController] inputContext];
}

- (void)keyDown:(NSEvent *)event
{
    if (!_isStarted || !_proxy)
        return;
    
    NSString *string = nil;
    if ([[WebTextInputWindowController sharedTextInputWindowController] interpretKeyEvent:event string:&string]) {
        if (string)
            _proxy->insertText(string);
        return;
    }
    
    _proxy->keyEvent(self, event, NPCocoaEventKeyDown);
}

- (void)keyUp:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->keyEvent(self, event, NPCocoaEventKeyUp);
}

- (void)flagsChanged:(NSEvent *)event
{
    if (_isStarted && _proxy)
        _proxy->flagsChanged(event);
}

- (void)sendModifierEventWithKeyCode:(int)keyCode character:(char)character
{
    if (_isStarted && _proxy)
        _proxy->syntheticKeyDownWithCommandModifier(keyCode, character);
}

- (void)pluginHostDied
{
    if (is<RenderEmbeddedObject>(_element->renderer()))
        downcast<RenderEmbeddedObject>(*_element->renderer()).setPluginUnavailabilityReason(RenderEmbeddedObject::PluginCrashed);

    _pluginLayer = nil;
    _proxy = nullptr;
    
    // No need for us to be layer backed anymore
    self.wantsLayer = NO;
    
    [self invalidatePluginContentRect:[self bounds]];
}

- (void)drawRect:(NSRect)rect
{
    if (_cachedSnapshot) {
        NSRect sourceRect = { NSZeroPoint, [_cachedSnapshot.get() size] };
        [_cachedSnapshot.get() drawInRect:[self bounds] fromRect:sourceRect operation:NSCompositingOperationSourceOver fraction:1];
        return;
    }

    if (_proxy) {
        if (_softwareRenderer) {
            if ([NSGraphicsContext currentContextDrawingToScreen]) {
                _softwareRenderer->render([[NSGraphicsContext currentContext] CGContext], NSRectToCGRect(rect));
                _proxy->didDraw();
            } else
                _proxy->print([[NSGraphicsContext currentContext] CGContext], [self bounds].size.width, [self bounds].size.height);
        } else if (_snapshotting && [self supportsSnapshotting]) {
            _proxy->snapshot([[NSGraphicsContext currentContext] CGContext], [self bounds].size.width, [self bounds].size.height);
        }

        return;
    }
}

- (RefPtr<JSC::Bindings::Instance>)createPluginBindingsInstance:(Ref<JSC::Bindings::RootObject>&&)rootObject
{
    if (!_proxy)
        return nullptr;
    
    return _proxy->createBindingsInstance(WTFMove(rootObject));
}

- (void)pluginView:(NSView *)pluginView receivedResponse:(NSURLResponse *)response
{
    ASSERT(_loadManually);
    if (!_proxy)
        return;
    
    ASSERT(!_proxy->manualStream());

    _proxy->setManualStream(HostedNetscapePluginStream::create(_proxy.get(), &core([self webFrame])->loader()));
    _proxy->manualStream()->startStreamWithResponse(response);
}

- (void)pluginView:(NSView *)pluginView receivedData:(NSData *)data
{
    ASSERT(_loadManually);
    if (!_proxy)
        return;
    
    if (HostedNetscapePluginStream* manualStream = _proxy->manualStream())
        manualStream->didReceiveData(0, static_cast<const char*>([data bytes]), [data length]);
}

- (void)pluginView:(NSView *)pluginView receivedError:(NSError *)error
{
    ASSERT(_loadManually);
    if (!_proxy)
        return;
    
    if (HostedNetscapePluginStream* manualStream = _proxy->manualStream())
        manualStream->didFail(0, error);
}

- (void)pluginViewFinishedLoading:(NSView *)pluginView
{
    ASSERT(_loadManually);
    if (!_proxy)
        return;
    
    if (HostedNetscapePluginStream* manualStream = _proxy->manualStream())
        manualStream->didFinishLoading(0);
}

- (void)webFrame:(WebFrame *)webFrame didFinishLoadWithReason:(NPReason)reason
{
    if (_isStarted && _proxy)
        _proxy->webFrameDidFinishLoadWithReason(webFrame, reason);
}

- (void)webFrame:(WebFrame *)webFrame didFinishLoadWithError:(NSError *)error
{
    NPReason reason = NPRES_DONE;
    if (error)
        reason = HostedNetscapePluginStream::reasonForError(error);
    [self webFrame:webFrame didFinishLoadWithReason:reason];
}

@end

#endif // USE(PLUGIN_HOST_PROCESS) && ENABLE(NETSCAPE_PLUGIN_API)