/*

 * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>

 *

 * SPDX-License-Identifier: BSD-2-Clause

 */

#pragma once

#include <AK/ByteBuffer.h>

#include <LibGfx/Forward.h>

#include <LibWeb/HTML/HTMLElement.h>

#include <LibWeb/WebGL/WebGLRenderingContext.h>

namespace Web::HTML {

class HTMLCanvasElement final : public HTMLElement {

    WEB_PLATFORM_OBJECT(HTMLCanvasElement, HTMLElement);

    JS_DECLARE_ALLOCATOR(HTMLCanvasElement);

public:

    using RenderingContext = Variant<JS::Handle<CanvasRenderingContext2D>, JS::Handle<WebGL::WebGLRenderingContext>, Empty>;

    virtual ~HTMLCanvasElement() override;

    Gfx::Bitmap const* bitmap() const { return m_bitmap; }

    Gfx::Bitmap* bitmap() { return m_bitmap; }

    bool create_bitmap(size_t minimum_width = 0, size_t minimum_height = 0);

    JS::ThrowCompletionOr<RenderingContext> get_context(String const& type, JS::Value options);

    unsigned width() const;

    unsigned height() const;

    WebIDL::ExceptionOr<void> set_width(unsigned);

    WebIDL::ExceptionOr<void> set_height(unsigned);

    String to_data_url(StringView type, Optional<double> quality);

    WebIDL::ExceptionOr<void> to_blob(JS::NonnullGCPtr<WebIDL::CallbackType> callback, StringView type, Optional<double> quality);

    void present();

private:

    HTMLCanvasElement(DOM::Document&, DOM::QualifiedName);

    virtual void initialize(JS::Realm&) override;

    virtual void visit_edges(Cell::Visitor&) override;

    virtual void apply_presentational_hints(CSS::StyleProperties&) const override;

    virtual JS::GCPtr<Layout::Node> create_layout_node(NonnullRefPtr<CSS::StyleProperties>) override;

    enum class HasOrCreatedContext {

        No,

        Yes,

    };

    HasOrCreatedContext create_2d_context();

    JS::ThrowCompletionOr<HasOrCreatedContext> create_webgl_context(JS::Value options);

    void reset_context_to_default_state();

    RefPtr<Gfx::Bitmap> m_bitmap;

    Variant<JS::NonnullGCPtr<HTML::CanvasRenderingContext2D>, JS::NonnullGCPtr<WebGL::WebGLRenderingContext>, Empty> m_context;

};

}