/*
 * Copyright (c) 2013, Google Inc. All rights reserved.
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 * 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.
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 * 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
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 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef ImageBitmapFactories_h
#define ImageBitmapFactories_h

#include "bindings/core/v8/ScriptPromise.h"
#include "bindings/core/v8/ScriptPromiseResolver.h"
#include "bindings/core/v8/ScriptState.h"
#include "bindings/core/v8/UnionTypesCore.h"
#include "core/fileapi/FileReaderLoader.h"
#include "core/fileapi/FileReaderLoaderClient.h"
#include "platform/Supplementable.h"
#include "platform/geometry/IntRect.h"

namespace blink {

class ImageBitmapSource;
class Blob;
class EventTarget;
class ExceptionState;
class ExecutionContext;

typedef HTMLImageElementOrHTMLVideoElementOrHTMLCanvasElementOrBlobOrImageDataOrImageBitmap ImageBitmapSourceUnion;

class ImageBitmapFactories final : public NoBaseWillBeGarbageCollectedFinalized<ImageBitmapFactories>, public WillBeHeapSupplement<LocalDOMWindow>, public WillBeHeapSupplement<WorkerGlobalScope> {
    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(ImageBitmapFactories);
    USING_FAST_MALLOC_WILL_BE_REMOVED(ImageBitmapFactories);

public:
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, const ImageBitmapSourceUnion&, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(ScriptState*, EventTarget&, ImageBitmapSource*, int sx, int sy, int sw, int sh, ExceptionState&);

    virtual ~ImageBitmapFactories() { }

    DECLARE_TRACE();

protected:
    static const char* supplementName();

private:
    class ImageBitmapLoader final : public GarbageCollectedFinalized<ImageBitmapLoader>, public FileReaderLoaderClient {
    public:
        static ImageBitmapLoader* create(ImageBitmapFactories& factory, const IntRect& cropRect, ScriptState* scriptState)
        {
            return new ImageBitmapLoader(factory, cropRect, scriptState);
        }

        void loadBlobAsync(ExecutionContext*, Blob*);
        ScriptPromise promise() { return m_resolver->promise(); }

        DECLARE_TRACE();

        ~ImageBitmapLoader() override { }

    private:
        ImageBitmapLoader(ImageBitmapFactories&, const IntRect&, ScriptState*);

        void rejectPromise();

        // FileReaderLoaderClient
        void didStartLoading() override { }
        void didReceiveData() override { }
        void didFinishLoading() override;
        void didFail(FileError::ErrorCode) override;

        FileReaderLoader m_loader;
        RawPtrWillBeMember<ImageBitmapFactories> m_factory;
        Member<ScriptPromiseResolver> m_resolver;
        IntRect m_cropRect;
    };

    static ImageBitmapFactories& from(EventTarget&);

    template<class GlobalObject>
    static ImageBitmapFactories& fromInternal(GlobalObject&);

    void addLoader(ImageBitmapLoader*);
    void didFinishLoading(ImageBitmapLoader*);

    PersistentHeapHashSetWillBeHeapHashSet<Member<ImageBitmapLoader>> m_pendingLoaders;
};

} // namespace blink

#endif // ImageBitmapFactories_h