//
// Copyright 2019 Mateusz Loskot <mateusz at loskot dot net>
// Copyright 2005-2007 Adobe Systems Incorporated
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
#ifndef BOOST_GIL_TEST_CORE_PIXEL_TEST_FIXTURE_HPP
#define BOOST_GIL_TEST_CORE_PIXEL_TEST_FIXTURE_HPP

#include <boost/gil/channel.hpp>
#include <boost/gil/color_base_algorithm.hpp>
#include <boost/gil/concepts/pixel.hpp>
#include <boost/gil/packed_pixel.hpp>
#include <boost/gil/pixel.hpp>
#include <boost/gil/planar_pixel_reference.hpp>
#include <boost/gil/promote_integral.hpp>
#include <boost/gil/typedefs.hpp>
#include <boost/gil/extension/toolbox/metafunctions/channel_type.hpp> // channel_type for packed and bit-aligned pixels

#include <boost/core/ignore_unused.hpp>
#include <boost/mp11.hpp>
#include <boost/mp11/mpl.hpp> // for compatibility with Boost.Test

#include <cstdint>
#include <iterator>
#include <tuple>
#include <type_traits>

#include "core/test_fixture.hpp" // random_value
#include "core/channel/test_fixture.hpp" // channel_minmax_value

namespace boost { namespace gil { namespace test { namespace fixture {

template <typename Pixel>
struct pixel_generator
{
    using channel_t = typename gil::channel_type<Pixel>::type;

    static auto max() -> Pixel
    {
        channel_minmax_value<channel_t> channel;
        Pixel pixel;
        gil::static_fill(pixel, channel.max_v_);
        return pixel;
    }

    static auto min()-> Pixel
    {
        channel_minmax_value<channel_t> channel;
        Pixel pixel;
        gil::static_fill(pixel, channel.min_v_);
        return pixel;
    }

    static auto random() -> Pixel
    {
        random_value<channel_t> generate;
        Pixel pixel;
        gil::static_generate(pixel, [&generate]() { return generate(); });
        return pixel;
    }
};

template <typename Pixel, int Tag = 0>
class pixel_value
{
public:
    using type = Pixel;
    using pixel_t = type;
    type pixel_{};

    pixel_value() = default;
    explicit pixel_value(pixel_t const& pixel)
        : pixel_(pixel) // test copy constructor
    {
        type temp_pixel; // test default constructor
        boost::ignore_unused(temp_pixel);
        boost::function_requires<PixelValueConcept<pixel_t> >();
    }
};

// Alias compatible with naming of equivalent class in the test/legacy/pixel.cpp
// The core suffix indicates `Pixel` is GIL core pixel type.
template <typename Pixel, int Tag = 0>
using value_core = pixel_value<Pixel, Tag>;

template <typename PixelRef, int Tag = 0>
struct pixel_reference
    : pixel_value
    <
        typename std::remove_reference<PixelRef>::type,
        Tag
    >
{
    static_assert(
        std::is_reference<PixelRef>::value ||
        gil::is_planar<PixelRef>::value, // poor-man test for specialization of planar_pixel_reference
        "PixelRef must be reference or gil::planar_pixel_reference");

    using type = PixelRef;
    using pixel_t = typename std::remove_reference<PixelRef>::type;
    using parent_t = pixel_value<typename pixel_t::value_type, Tag>;
    using value_t = typename pixel_t::value_type;
    type pixel_; // reference

    pixel_reference() : parent_t{}, pixel_(parent_t::pixel_) {}
    explicit pixel_reference(value_t const& pixel) : parent_t(pixel), pixel_(parent_t::pixel_)
    {
        boost::function_requires<PixelConcept<pixel_t>>();
    }
};

// Alias compatible with naming of equivalent class in the test/legacy/pixel.cpp
// The core suffix indicates `Pixel` is GIL core pixel type.
template <typename Pixel, int Tag = 0>
using reference_core = pixel_reference<Pixel, Tag>;

// Metafunction to yield nested type of a representative pixel type
template <typename PixelValueOrReference>
using nested_type = typename PixelValueOrReference::type;

// Metafunction to yield nested type of a representative pixel_t type
template <typename PixelValueOrReference>
using nested_pixel_type = typename PixelValueOrReference::pixel_t;

// Subset of pixel models that covers all color spaces, channel depths,
// reference/value, planar/interleaved, const/mutable.
// Operations like color conversion will be invoked on pairs of those.
using representative_pixel_types= ::boost::mp11::mp_list
<
    value_core<gil::gray8_pixel_t>,
    reference_core<gil::gray16_pixel_t&>,
    value_core<gil::bgr8_pixel_t>,
    reference_core<gil::rgb8_planar_ref_t>,
    value_core<gil::argb32_pixel_t>,
    reference_core<gil::cmyk32f_pixel_t&>,
    reference_core<gil::abgr16c_ref_t>, // immutable reference
    reference_core<gil::rgb32fc_planar_ref_t>
>;

// List of all integer-based core pixel typedefs (i.e. with cv-qualifiers)
using pixel_integer_types = ::boost::mp11::mp_list
<
    gil::gray8_pixel_t,
    gil::gray8s_pixel_t,
    gil::gray16_pixel_t,
    gil::gray16s_pixel_t,
    gil::gray32_pixel_t,
    gil::gray32s_pixel_t,
    gil::bgr8_pixel_t,
    gil::bgr8s_pixel_t,
    gil::bgr16_pixel_t,
    gil::bgr16s_pixel_t,
    gil::bgr32_pixel_t,
    gil::bgr32s_pixel_t,
    gil::rgb8_pixel_t,
    gil::rgb8s_pixel_t,
    gil::rgb16_pixel_t,
    gil::rgb16s_pixel_t,
    gil::rgb32_pixel_t,
    gil::rgb32s_pixel_t,
    gil::abgr8_pixel_t,
    gil::abgr8s_pixel_t,
    gil::abgr16_pixel_t,
    gil::abgr16s_pixel_t,
    gil::abgr32_pixel_t,
    gil::abgr32s_pixel_t,
    gil::bgra8_pixel_t,
    gil::bgra8s_pixel_t,
    gil::bgra16_pixel_t,
    gil::bgra16s_pixel_t,
    gil::bgra32_pixel_t,
    gil::bgra32s_pixel_t,
    gil::cmyk8_pixel_t,
    gil::cmyk8s_pixel_t,
    gil::cmyk16_pixel_t,
    gil::cmyk16s_pixel_t,
    gil::cmyk32_pixel_t,
    gil::cmyk32s_pixel_t,
    gil::rgba8_pixel_t,
    gil::rgba8s_pixel_t,
    gil::rgba16_pixel_t,
    gil::rgba16s_pixel_t,
    gil::rgba32_pixel_t,
    gil::rgba32s_pixel_t
>;

// List of all integer-based core pixel typedefs (i.e. with cv-qualifiers)
using pixel_float_types = ::boost::mp11::mp_list
<
    gil::gray32f_pixel_t,
    gil::bgr32f_pixel_t,
    gil::rgb32f_pixel_t,
    gil::abgr32f_pixel_t,
    gil::bgra32f_pixel_t,
    gil::cmyk32f_pixel_t,
    gil::rgba32f_pixel_t
>;

// List of all core pixel types (i.e. without cv-qualifiers)
using pixel_types = ::boost::mp11::mp_append
<
    pixel_integer_types,
    pixel_float_types
>;

// List of all core pixel typedefs (i.e. with cv-qualifiers)
using pixel_typedefs = ::boost::mp11::mp_append
<
    pixel_integer_types,
    pixel_float_types,
    ::boost::mp11::mp_list
    <
        gil::gray8c_pixel_t,
        gil::gray8sc_pixel_t,
        gil::gray16c_pixel_t,
        gil::gray16sc_pixel_t,
        gil::gray32c_pixel_t,
        gil::gray32fc_pixel_t,
        gil::gray32sc_pixel_t,
        gil::bgr8c_pixel_t,
        gil::bgr8sc_pixel_t,
        gil::bgr16c_pixel_t,
        gil::bgr16sc_pixel_t,
        gil::bgr32c_pixel_t,
        gil::bgr32fc_pixel_t,
        gil::bgr32sc_pixel_t,
        gil::rgb8c_pixel_t,
        gil::rgb8sc_pixel_t,
        gil::rgb16c_pixel_t,
        gil::rgb16sc_pixel_t,
        gil::rgb32c_pixel_t,
        gil::rgb32fc_pixel_t,
        gil::rgb32sc_pixel_t,
        gil::abgr8c_pixel_t,
        gil::abgr8sc_pixel_t,
        gil::abgr16c_pixel_t,
        gil::abgr16sc_pixel_t,
        gil::abgr32c_pixel_t,
        gil::abgr32fc_pixel_t,
        gil::abgr32sc_pixel_t,
        gil::bgra8c_pixel_t,
        gil::bgra8sc_pixel_t,
        gil::bgra16c_pixel_t,
        gil::bgra16sc_pixel_t,
        gil::bgra32c_pixel_t,
        gil::bgra32fc_pixel_t,
        gil::bgra32sc_pixel_t,
        gil::cmyk8c_pixel_t,
        gil::cmyk8sc_pixel_t,
        gil::cmyk16c_pixel_t,
        gil::cmyk16sc_pixel_t,
        gil::cmyk32c_pixel_t,
        gil::cmyk32fc_pixel_t,
        gil::cmyk32sc_pixel_t,
        gil::rgba8c_pixel_t,
        gil::rgba8sc_pixel_t,
        gil::rgba16c_pixel_t,
        gil::rgba16sc_pixel_t,
        gil::rgba32c_pixel_t,
        gil::rgba32fc_pixel_t,
        gil::rgba32sc_pixel_t
    >
>;

struct not_a_pixel_type {};

using non_pixels = ::boost::mp11::mp_list
<
    not_a_pixel_type,
    char,
    short, int, long,
    double, float,
    std::size_t,
    std::true_type,
    std::false_type
>;

using packed_channel_references_3 = typename gil::detail::packed_channel_references_vector_type
<
    std::uint8_t,
    mp11::mp_list_c<int, 3>
>::type;

using packed_pixel_gray3 = gil::packed_pixel
<
    std::uint8_t,
    packed_channel_references_3,
    gil::gray_layout_t
>;

using packed_channel_references_121 = typename gil::detail::packed_channel_references_vector_type
<
    std::uint8_t,
    mp11::mp_list_c<int, 1, 2, 1>
>::type;

using packed_pixel_bgr121 = gil::packed_pixel
<
    std::uint8_t,
    packed_channel_references_121,
    gil::bgr_layout_t
>;

using packed_channel_references_535 = typename gil::detail::packed_channel_references_vector_type
<
    std::uint16_t,
    mp11::mp_list_c<int, 5, 3, 5>
>::type;

using packed_pixel_rgb535 = gil::packed_pixel
<
    std::uint16_t,
    packed_channel_references_535,
    gil::rgb_layout_t
>;

using bit_aligned_pixel_bgr232_refefence = gil::bit_aligned_pixel_reference
    <
        std::uint8_t,
        mp11::mp_list_c<int, 2, 3, 2>,
        gil::bgr_layout_t,
        true
    > const;

using bit_aligned_pixel_bgr232_iterator = bit_aligned_pixel_iterator<bit_aligned_pixel_bgr232_refefence>;

using bit_aligned_pixel_bgr232 = std::iterator_traits<bit_aligned_pixel_bgr232_iterator>::value_type;

using bit_aligned_pixel_rgb567_refefence = gil::bit_aligned_pixel_reference
    <
        std::uint32_t,
        mp11::mp_list_c<int, 5, 6, 7>,
        gil::rgb_layout_t,
        true
    > const;

using bit_aligned_pixel_rgb567_iterator = bit_aligned_pixel_iterator<bit_aligned_pixel_rgb567_refefence>;

using bit_aligned_pixel_rgb567 = std::iterator_traits<bit_aligned_pixel_rgb567_iterator>::value_type;

}}}} // namespace boost::gil::test::fixture

#endif