/*
 * Copyright (c) 2023, Lucas Chollet <lucas.chollet@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/MemoryStream.h>
#include <AK/NonnullOwnPtr.h>
#include <LibGfx/ImageFormats/ImageDecoder.h>

namespace Gfx {

class ExifMetadata;

// This is a link to the main TIFF specification from 1992
// https://www.itu.int/itudoc/itu-t/com16/tiff-fx/docs/tiff6.pdf

// First TIFF Technical notes from 1995
// https://www.awaresystems.be/imaging/tiff/specification/TIFFPM6.pdf

// Second TIFF Technical notes from 1995
// The document is the second (and current) specification for embedded JPEGs in TIFF images.
// https://www.awaresystems.be/imaging/tiff/specification/TIFFTechNote2.txt

// This is also compatible with Exif as it is, basically, another set of TIFF tags:
// The spec is named "Exchangeable image file format for digital still cameras: Exif Version 3.0"
// And it can be found at https://www.cipa.jp/e/std/std-sec.html

namespace TIFF {
class TIFFLoadingContext;
}

class TIFFImageDecoderPlugin : public ImageDecoderPlugin {
public:
    static bool sniff(ReadonlyBytes);
    static ErrorOr<NonnullOwnPtr<ImageDecoderPlugin>> create(ReadonlyBytes);
    static ErrorOr<NonnullOwnPtr<ExifMetadata>> read_exif_metadata(ReadonlyBytes);

    virtual ~TIFFImageDecoderPlugin() override;

    virtual IntSize size() override;

    virtual ErrorOr<ImageFrameDescriptor> frame(size_t index, Optional<IntSize> ideal_size = {}) override;

    virtual Optional<Metadata const&> metadata() override;
    virtual ErrorOr<Optional<ReadonlyBytes>> icc_data() override;

    virtual NaturalFrameFormat natural_frame_format() const override;
    virtual ErrorOr<NonnullRefPtr<CMYKBitmap>> cmyk_frame() override;

    static ErrorOr<ByteBuffer> invert_horizontal_differencing(ReadonlyBytes, u32 columns, Span<u32> bits_per_component);

private:
    TIFFImageDecoderPlugin(NonnullOwnPtr<FixedMemoryStream>);

    OwnPtr<TIFF::TIFFLoadingContext> m_context;
};

}