/*

 * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>

 * Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>

 *

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

 */

#pragma once

#include <AK/String.h>

#include <AK/Variant.h>

#include <LibGfx/AffineTransform.h>

#include <LibGfx/AntiAliasingPainter.h>

#include <LibGfx/Color.h>

#include <LibGfx/Forward.h>

#include <LibGfx/Path.h>

#include <LibGfx/PathClipper.h>

#include <LibWeb/Bindings/PlatformObject.h>

#include <LibWeb/HTML/Canvas/CanvasCompositing.h>

#include <LibWeb/HTML/Canvas/CanvasDrawImage.h>

#include <LibWeb/HTML/Canvas/CanvasDrawPath.h>

#include <LibWeb/HTML/Canvas/CanvasFillStrokeStyles.h>

#include <LibWeb/HTML/Canvas/CanvasImageData.h>

#include <LibWeb/HTML/Canvas/CanvasImageSmoothing.h>

#include <LibWeb/HTML/Canvas/CanvasPath.h>

#include <LibWeb/HTML/Canvas/CanvasPathDrawingStyles.h>

#include <LibWeb/HTML/Canvas/CanvasRect.h>

#include <LibWeb/HTML/Canvas/CanvasState.h>

#include <LibWeb/HTML/Canvas/CanvasText.h>

#include <LibWeb/HTML/Canvas/CanvasTextDrawingStyles.h>

#include <LibWeb/HTML/Canvas/CanvasTransform.h>

#include <LibWeb/HTML/CanvasGradient.h>

#include <LibWeb/Layout/InlineNode.h>

#include <LibWeb/Layout/LineBox.h>

#include <LibWeb/WebIDL/ExceptionOr.h>

namespace Web::HTML {

class CanvasRenderingContext2D

    : public Bindings::PlatformObject

    , public CanvasPath

    , public CanvasState

    , public CanvasTransform<CanvasRenderingContext2D>

    , public CanvasFillStrokeStyles<CanvasRenderingContext2D>

    , public CanvasRect

    , public CanvasDrawPath

    , public CanvasText

    , public CanvasDrawImage

    , public CanvasImageData

    , public CanvasImageSmoothing

    , public CanvasCompositing

    , public CanvasPathDrawingStyles<CanvasRenderingContext2D>

    , public CanvasTextDrawingStyles<CanvasRenderingContext2D> {

    WEB_PLATFORM_OBJECT(CanvasRenderingContext2D, Bindings::PlatformObject);

    JS_DECLARE_ALLOCATOR(CanvasRenderingContext2D);

public:

    [[nodiscard]] static JS::NonnullGCPtr<CanvasRenderingContext2D> create(JS::Realm&, HTMLCanvasElement&);

    virtual ~CanvasRenderingContext2D() override;

    virtual void fill_rect(float x, float y, float width, float height) override;

    virtual void stroke_rect(float x, float y, float width, float height) override;

    virtual void clear_rect(float x, float y, float width, float height) override;

    virtual WebIDL::ExceptionOr<void> draw_image_internal(CanvasImageSource const&, float source_x, float source_y, float source_width, float source_height, float destination_x, float destination_y, float destination_width, float destination_height) override;

    virtual void begin_path() override;

    virtual void stroke() override;

    virtual void stroke(Path2D const& path) override;

    virtual void fill_text(StringView, float x, float y, Optional<double> max_width) override;

    virtual void stroke_text(StringView, float x, float y, Optional<double> max_width) override;

    virtual void fill(StringView fill_rule) override;

    virtual void fill(Path2D& path, StringView fill_rule) override;

    virtual WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> create_image_data(int width, int height, Optional<ImageDataSettings> const& settings = {}) const override;

    virtual WebIDL::ExceptionOr<JS::NonnullGCPtr<ImageData>> create_image_data(ImageData const& image_data) const override;

    virtual WebIDL::ExceptionOr<JS::GCPtr<ImageData>> get_image_data(int x, int y, int width, int height, Optional<ImageDataSettings> const& settings = {}) const override;

    virtual void put_image_data(ImageData const&, float x, float y) override;

    virtual void reset_to_default_state() override;

    JS::NonnullGCPtr<HTMLCanvasElement> canvas_for_binding() const;

    virtual JS::NonnullGCPtr<TextMetrics> measure_text(StringView text) override;

    virtual void clip(StringView fill_rule) override;

    virtual void clip(Path2D& path, StringView fill_rule) override;

    virtual bool image_smoothing_enabled() const override;

    virtual void set_image_smoothing_enabled(bool) override;

    virtual Bindings::ImageSmoothingQuality image_smoothing_quality() const override;

    virtual void set_image_smoothing_quality(Bindings::ImageSmoothingQuality) override;

    virtual float global_alpha() const override;

    virtual void set_global_alpha(float) override;

    HTMLCanvasElement& canvas_element();

    HTMLCanvasElement const& canvas_element() const;

private:

    explicit CanvasRenderingContext2D(JS::Realm&, HTMLCanvasElement&);

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

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

    struct PreparedTextGlyph {

        String glyph;

        Gfx::IntPoint position;

    };

    struct PreparedText {

        Vector<PreparedTextGlyph> glyphs;

        Gfx::TextAlignment physical_alignment;

        Gfx::IntRect bounding_box;

    };

    void did_draw(Gfx::FloatRect const&);

    template<typename TDrawFunction>

    void draw_clipped(TDrawFunction draw_function)

    {

        auto painter = this->antialiased_painter();

        if (!painter.has_value())

            return;

        Gfx::ScopedPathClip clipper(painter->underlying_painter(), drawing_state().clip);

        auto draw_rect = draw_function(*painter);

        if (drawing_state().clip.has_value())

            draw_rect.intersect(drawing_state().clip->path.bounding_box());

        did_draw(draw_rect);

    }

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::clear_rect(float, float, float, float)::$_0>(Web::HTML::CanvasRenderingContext2D::clear_rect(float, float, float, float)::$_0)

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::draw_image_internal(AK::Variant<JS::Handle<Web::HTML::HTMLImageElement>, JS::Handle<Web::SVG::SVGImageElement>, JS::Handle<Web::HTML::HTMLCanvasElement>, JS::Handle<Web::HTML::ImageBitmap>, JS::Handle<Web::HTML::HTMLVideoElement> > const&, float, float, float, float, float, float, float, float)::$_1>(Web::HTML::CanvasRenderingContext2D::draw_image_internal(AK::Variant<JS::Handle<Web::HTML::HTMLImageElement>, JS::Handle<Web::SVG::SVGImageElement>, JS::Handle<Web::HTML::HTMLCanvasElement>, JS::Handle<Web::HTML::ImageBitmap>, JS::Handle<Web::HTML::HTMLVideoElement> > const&, float, float, float, float, float, float, float, float)::$_1)

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::bitmap_font_fill_text(AK::StringView, float, float, AK::Optional<double>)::$_0>(Web::HTML::CanvasRenderingContext2D::bitmap_font_fill_text(AK::StringView, float, float, AK::Optional<double>)::$_0)

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::stroke_internal(Gfx::Path const&)::$_0>(Web::HTML::CanvasRenderingContext2D::stroke_internal(Gfx::Path const&)::$_0)

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::fill_internal(Gfx::Path const&, Gfx::WindingRule)::$_0>(Web::HTML::CanvasRenderingContext2D::fill_internal(Gfx::Path const&, Gfx::WindingRule)::$_0)

Unexecuted instantiation: CanvasRenderingContext2D.cpp:void Web::HTML::CanvasRenderingContext2D::draw_clipped<Web::HTML::CanvasRenderingContext2D::put_image_data(Web::HTML::ImageData const&, float, float)::$_0>(Web::HTML::CanvasRenderingContext2D::put_image_data(Web::HTML::ImageData const&, float, float)::$_0)

    RefPtr<Gfx::Font const> current_font();

    PreparedText prepare_text(ByteString const& text, float max_width = INFINITY);

    Gfx::Painter* painter();

    Optional<Gfx::AntiAliasingPainter> antialiased_painter();

    Gfx::Path rect_path(float x, float y, float width, float height);

    Gfx::Path text_path(StringView text, float x, float y, Optional<double> max_width);

    void bitmap_font_fill_text(StringView text, float x, float y, Optional<double> max_width);

    void stroke_internal(Gfx::Path const&);

    void fill_internal(Gfx::Path const&, Gfx::WindingRule);

    void clip_internal(Gfx::Path&, Gfx::WindingRule);

    JS::NonnullGCPtr<HTMLCanvasElement> m_element;

    OwnPtr<Gfx::Painter> m_painter;

    // https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-origin-clean

    bool m_origin_clean { true };

};

enum class CanvasImageSourceUsability {

    Bad,

    Good,

};

WebIDL::ExceptionOr<CanvasImageSourceUsability> check_usability_of_image(CanvasImageSource const&);

bool image_is_not_origin_clean(CanvasImageSource const&);

}