/*
 * Copyright (c) 2013, Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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.
 */

#include "config.h"
#include "modules/imagebitmap/ImageBitmapFactories.h"

#include "bindings/v8/ExceptionState.h"
#include "bindings/v8/ScriptPromiseResolver.h"
#include "bindings/v8/ScriptPromiseResolverWithContext.h"
#include "core/dom/ExecutionContext.h"
#include "core/fileapi/Blob.h"
#include "core/html/HTMLCanvasElement.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLVideoElement.h"
#include "core/html/ImageData.h"
#include "core/html/canvas/CanvasRenderingContext2D.h"
#include "core/frame/LocalDOMWindow.h"
#include "core/frame/ImageBitmap.h"
#include "core/workers/WorkerGlobalScope.h"
#include "platform/SharedBuffer.h"
#include "platform/graphics/BitmapImage.h"
#include "platform/graphics/ImageSource.h"
#include "platform/graphics/skia/NativeImageSkia.h"
#include <v8.h>

namespace WebCore {

static LayoutSize sizeFor(HTMLImageElement* image)
{
    if (ImageResource* cachedImage = image->cachedImage())
        return cachedImage->imageSizeForRenderer(image->renderer(), 1.0f); // FIXME: Not sure about this.
    return IntSize();
}

static IntSize sizeFor(HTMLVideoElement* video)
{
    if (blink::WebMediaPlayer* webMediaPlayer = video->webMediaPlayer())
        return webMediaPlayer->naturalSize();
    return IntSize();
}

static ScriptPromise fulfillImageBitmap(ScriptState* scriptState, PassRefPtrWillBeRawPtr<ImageBitmap> imageBitmap)
{
    RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(scriptState);
    ScriptPromise promise = resolver->promise();
    if (imageBitmap) {
        resolver->resolve(imageBitmap);
    } else {
        resolver->reject(ScriptValue(scriptState, v8::Null(scriptState->isolate())));
    }
    return promise;
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLImageElement* image, ExceptionState& exceptionState)
{
    LayoutSize s = sizeFor(image);
    return createImageBitmap(scriptState, eventTarget, image, 0, 0, s.width(), s.height(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLImageElement* image, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    // This variant does not work in worker threads.
    ASSERT(eventTarget.toDOMWindow());

    if (!image->cachedImage()) {
        exceptionState.throwDOMException(InvalidStateError, "No image can be retrieved from the provided element.");
        return ScriptPromise();
    }
    if (image->cachedImage()->image()->isSVGImage()) {
        exceptionState.throwDOMException(InvalidStateError, "The image element contains an SVG image, which is unsupported.");
        return ScriptPromise();
    }
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    if (!image->cachedImage()->image()->currentFrameHasSingleSecurityOrigin()) {
        exceptionState.throwSecurityError("The source image contains image data from multiple origins.");
        return ScriptPromise();
    }
    if (!image->cachedImage()->passesAccessControlCheck(eventTarget.toDOMWindow()->document()->securityOrigin()) && eventTarget.toDOMWindow()->document()->securityOrigin()->taintsCanvas(image->src())) {
        exceptionState.throwSecurityError("Cross-origin access to the source image is denied.");
        return ScriptPromise();
    }
    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, ImageBitmap::create(image, IntRect(sx, sy, sw, sh)));
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLVideoElement* video, ExceptionState& exceptionState)
{
    IntSize s = sizeFor(video);
    return createImageBitmap(scriptState, eventTarget, video, 0, 0, s.width(), s.height(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLVideoElement* video, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    // This variant does not work in worker threads.
    ASSERT(eventTarget.toDOMWindow());

    if (video->networkState() == HTMLMediaElement::NETWORK_EMPTY) {
        exceptionState.throwDOMException(InvalidStateError, "The provided element has not retrieved data.");
        return ScriptPromise();
    }
    // FIXME: Remove the below null check once we fix the bug 382721
    if (video->readyState() <= HTMLMediaElement::HAVE_METADATA || !video->webMediaPlayer()) {
        exceptionState.throwDOMException(InvalidStateError, "The provided element's player has no current data.");
        return ScriptPromise();
    }
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    if (!video->hasSingleSecurityOrigin()) {
        exceptionState.throwSecurityError("The source video contains image data from multiple origins.");
        return ScriptPromise();
    }
    if (!video->webMediaPlayer()->didPassCORSAccessCheck()
        && eventTarget.toDOMWindow()->document()->securityOrigin()->taintsCanvas(video->currentSrc())) {
        exceptionState.throwSecurityError("Cross-origin access to the source video is denied.");
        return ScriptPromise();
    }
    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, ImageBitmap::create(video, IntRect(sx, sy, sw, sh)));
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, CanvasRenderingContext2D* context, ExceptionState& exceptionState)
{
    return createImageBitmap(scriptState, eventTarget, context->canvas(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, CanvasRenderingContext2D* context, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    return createImageBitmap(scriptState, eventTarget, context->canvas(), sx, sy, sw, sh, exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLCanvasElement* canvas, ExceptionState& exceptionState)
{
    return createImageBitmap(scriptState, eventTarget, canvas, 0, 0, canvas->width(), canvas->height(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, HTMLCanvasElement* canvas, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    // This variant does not work in worker threads.
    ASSERT(eventTarget.toDOMWindow());

    if (!canvas->originClean()) {
        exceptionState.throwSecurityError("The canvas element provided is tainted with cross-origin data.");
        return ScriptPromise();
    }
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }

    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, canvas->buffer() ? ImageBitmap::create(canvas, IntRect(sx, sy, sw, sh)) : nullptr);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, Blob* blob, ExceptionState& exceptionState)
{
    ImageBitmapLoader* loader = ImageBitmapFactories::ImageBitmapLoader::create(from(eventTarget), IntRect(), scriptState);
    ScriptPromise promise = loader->promise();
    from(eventTarget).addLoader(loader);
    loader->loadBlobAsync(eventTarget.executionContext(), blob);
    return promise;
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, Blob* blob, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    ImageBitmapLoader* loader = ImageBitmapFactories::ImageBitmapLoader::create(from(eventTarget), IntRect(sx, sy, sw, sh), scriptState);
    ScriptPromise promise = loader->promise();
    from(eventTarget).addLoader(loader);
    loader->loadBlobAsync(eventTarget.executionContext(), blob);
    return promise;
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, ImageData* data, ExceptionState& exceptionState)
{
    return createImageBitmap(scriptState, eventTarget, data, 0, 0, data->width(), data->height(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, ImageData* data, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, ImageBitmap::create(data, IntRect(sx, sy, sw, sh)));
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, ImageBitmap* bitmap, ExceptionState& exceptionState)
{
    return createImageBitmap(scriptState, eventTarget, bitmap, 0, 0, bitmap->width(), bitmap->height(), exceptionState);
}

ScriptPromise ImageBitmapFactories::createImageBitmap(ScriptState* scriptState, EventTarget& eventTarget, ImageBitmap* bitmap, int sx, int sy, int sw, int sh, ExceptionState& exceptionState)
{
    if (!sw || !sh) {
        exceptionState.throwDOMException(IndexSizeError, String::format("The source %s provided is 0.", sw ? "height" : "width"));
        return ScriptPromise();
    }
    // FIXME: make ImageBitmap creation asynchronous crbug.com/258082
    return fulfillImageBitmap(scriptState, ImageBitmap::create(bitmap, IntRect(sx, sy, sw, sh)));
}

const char* ImageBitmapFactories::supplementName()
{
    return "ImageBitmapFactories";
}

ImageBitmapFactories& ImageBitmapFactories::from(EventTarget& eventTarget)
{
    if (LocalDOMWindow* window = eventTarget.toDOMWindow())
        return fromInternal(*window);

    ASSERT(eventTarget.executionContext()->isWorkerGlobalScope());
    return ImageBitmapFactories::fromInternal(*toWorkerGlobalScope(eventTarget.executionContext()));
}

template<class GlobalObject>
ImageBitmapFactories& ImageBitmapFactories::fromInternal(GlobalObject& object)
{
    ImageBitmapFactories* supplement = static_cast<ImageBitmapFactories*>(WillBeHeapSupplement<GlobalObject>::from(object, supplementName()));
    if (!supplement) {
        supplement = new ImageBitmapFactories();
        WillBeHeapSupplement<GlobalObject>::provideTo(object, supplementName(), adoptPtrWillBeNoop(supplement));
    }
    return *supplement;
}

void ImageBitmapFactories::addLoader(ImageBitmapLoader* loader)
{
    m_pendingLoaders.add(loader);
}

void ImageBitmapFactories::didFinishLoading(ImageBitmapLoader* loader)
{
    ASSERT(m_pendingLoaders.contains(loader));
    m_pendingLoaders.remove(loader);
}

ImageBitmapFactories::ImageBitmapLoader::ImageBitmapLoader(ImageBitmapFactories& factory, const IntRect& cropRect, ScriptState* scriptState)
    : m_loader(FileReaderLoader::ReadAsArrayBuffer, this)
    , m_factory(&factory)
    , m_resolver(ScriptPromiseResolverWithContext::create(scriptState))
    , m_cropRect(cropRect)
{
}

void ImageBitmapFactories::ImageBitmapLoader::loadBlobAsync(ExecutionContext* context, Blob* blob)
{
    m_loader.start(context, blob->blobDataHandle());
}

void ImageBitmapFactories::trace(Visitor* visitor)
{
    visitor->trace(m_pendingLoaders);
    WillBeHeapSupplement<LocalDOMWindow>::trace(visitor);
    WillBeHeapSupplement<WorkerGlobalScope>::trace(visitor);
}

void ImageBitmapFactories::ImageBitmapLoader::rejectPromise()
{
    m_resolver->reject(ScriptValue(m_resolver->scriptState(), v8::Null(m_resolver->scriptState()->isolate())));
    m_factory->didFinishLoading(this);
}

void ImageBitmapFactories::ImageBitmapLoader::didFinishLoading()
{
    if (!m_loader.arrayBufferResult()) {
        rejectPromise();
        return;
    }
    RefPtr<SharedBuffer> sharedBuffer = SharedBuffer::create((char*)m_loader.arrayBufferResult()->data(), m_loader.arrayBufferResult()->byteLength());

    OwnPtr<ImageSource> source = adoptPtr(new ImageSource());
    source->setData(*sharedBuffer, true);
    RefPtr<NativeImageSkia> imageSkia = source->createFrameAtIndex(0);
    if (!imageSkia) {
        rejectPromise();
        return;
    }

    RefPtr<Image> image = BitmapImage::create(imageSkia);
    if (!image->width() || !image->height()) {
        rejectPromise();
        return;
    }
    if (!m_cropRect.width() && !m_cropRect.height()) {
        // No cropping variant was called.
        m_cropRect = IntRect(IntPoint(), image->size());
    }

    RefPtrWillBeRawPtr<ImageBitmap> imageBitmap = ImageBitmap::create(image.get(), m_cropRect);
    m_resolver->resolve(imageBitmap.release());
    m_factory->didFinishLoading(this);
}

void ImageBitmapFactories::ImageBitmapLoader::didFail(FileError::ErrorCode)
{
    rejectPromise();
}

void ImageBitmapFactories::ImageBitmapLoader::trace(Visitor* visitor)
{
    visitor->trace(m_factory);
}

} // namespace WebCore