//
// Copyright 2019-2020 Mateusz Loskot <mateusz at loskot dot net>
//
// 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
//
#include <boost/gil/channel.hpp>
#include <boost/gil/gray.hpp>
#include <boost/gil/packed_pixel.hpp>
#include <boost/gil/rgb.hpp>

#include <boost/mp11.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/core/typeinfo.hpp>

#include "test_fixture.hpp"

namespace gil = boost::gil;
namespace fixture = boost::gil::test::fixture;
namespace mp11 = boost::mp11;

void test_packed_pixel_gray3_definition()
{
    // Verify packed_pixel members

    static_assert(std::is_same<fixture::packed_pixel_gray3::layout_t, gil::gray_layout_t>::value,
        "layout should be bgr");

    static_assert(std::is_same<fixture::packed_pixel_gray3::value_type, fixture::packed_pixel_gray3>::value,
        "value_type member should be of the same type as the packed_pixel specialization");

    static_assert(std::is_reference<fixture::packed_pixel_gray3::reference>::value,
        "reference member should be a reference");

    static_assert(std::is_reference<fixture::packed_pixel_gray3::const_reference>::value,
        "const_reference member should be a reference");

    static_assert(std::is_same<decltype(fixture::packed_pixel_gray3::is_mutable), bool const>::value &&
        fixture::packed_pixel_gray3::is_mutable,
        "is_mutable should be boolean");

    // Verify metafunctions

    static_assert(mp11::mp_size<fixture::packed_channel_references_3>::value == 1,
        "packed_channel_references_vector_type should define one reference to channel start bits");

    using channel1_ref_t = mp11::mp_at_c<fixture::packed_channel_references_3, 0>;
    static_assert(channel1_ref_t::num_bits == 3,
        "1st channel of gray3 pixel should be of 3-bit size");

    static_assert(std::is_same
        <
            channel1_ref_t,
            gil::packed_channel_reference<std::uint8_t, 0, 3, true> const
        >::value,
        "1st element of packed_channel_references_vector should be packed_channel_reference of 1st channel");

    // double check intermediate metafunction packed_channel_reference_type
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint8_t,
                std::integral_constant<int, 0>,
                std::integral_constant<int, 3>
            >::type,
            channel1_ref_t
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint8_t,
                std::integral_constant<int, 0>,
                std::integral_constant<int, 3>
            >::type,
            gil::packed_channel_reference<std::uint8_t, 0, 3, true> const
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
}

void test_packed_pixel_gray3_assignment()
{
    fixture::packed_pixel_gray3 p1{int{5}};
    fixture::packed_pixel_gray3 p2;
    p2 = p1;
    BOOST_TEST_EQ(p1._bitfield, p2._bitfield);
}

void test_packed_pixel_gray3_equality()
{
    fixture::packed_pixel_gray3 p1{int{5}};
    fixture::packed_pixel_gray3 p2{int{5}};
    BOOST_TEST_EQ(p1, p2);

    fixture::packed_pixel_gray3 p3{int{3}};
    BOOST_TEST_NE(p2, p3);
}

void test_packed_pixel_gray3_assignment_gray_channel()
{
    {
        fixture::packed_pixel_gray3 p1; // default-initialized
        p1 = int{5};
        BOOST_TEST_EQ(p1._bitfield, int{5});
    }

    {
        fixture::packed_pixel_gray3 p1{0}; // value-initialized
        p1 = int{5};
        BOOST_TEST_EQ(p1._bitfield, int{5});
    }
}

void test_packed_pixel_gray3_equality_gray_channel()
{
    fixture::packed_pixel_gray3 p1{int{3}};
    BOOST_TEST_EQ(p1, int{3});
}

void test_packed_pixel_bgr121_definition()
{
    // Verify packed_pixel members

    static_assert(std::is_same<fixture::packed_pixel_bgr121::layout_t, gil::bgr_layout_t>::value,
        "layout should be bgr");

    static_assert(std::is_same<fixture::packed_pixel_bgr121::value_type, fixture::packed_pixel_bgr121>::value,
        "value_type member should be of the same type as the packed_pixel specialization");

    static_assert(std::is_reference<fixture::packed_pixel_bgr121::reference>::value,
        "reference member should be a reference");

    static_assert(std::is_reference<fixture::packed_pixel_bgr121::const_reference>::value,
        "const_reference member should be a reference");

    static_assert(std::is_same<decltype(fixture::packed_pixel_bgr121::is_mutable), bool const>::value &&
        fixture::packed_pixel_bgr121::is_mutable,
        "is_mutable should be boolean");

    // Verify metafunctions

    static_assert(mp11::mp_size<fixture::packed_channel_references_121>::value == 3,
        "packed_channel_references_vector_type should define three references to channel start bits");

    using channel1_ref_t = mp11::mp_at_c<fixture::packed_channel_references_121, 0>;
    static_assert(channel1_ref_t::num_bits == 1,
        "1st channel of bgr121 pixel should be of 1-bit size");

    using channel2_ref_t = mp11::mp_at_c<fixture::packed_channel_references_121, 1>;
    static_assert(channel2_ref_t::num_bits == 2,
        "2nd channel of bgr121 pixel should be of 2-bit size");

    using channel3_ref_t = mp11::mp_at_c<fixture::packed_channel_references_121, 2>;
    static_assert(channel3_ref_t::num_bits == 1,
        "3rd channel of bgr121 pixel should be of 1-bit size");

    static_assert(std::is_same
        <
            channel1_ref_t,
            gil::packed_channel_reference<std::uint8_t, 0, 1, true> const
        >::value,
        "1st element of packed_channel_references_vector should be packed_channel_reference of 1st channel");

    static_assert(std::is_same
        <
            channel2_ref_t,
            gil::packed_channel_reference<std::uint8_t, 1, 2, true> const
        >::value,
        "2nd element of packed_channel_references_vector should be packed_channel_reference of 2nd channel");

    static_assert(std::is_same
        <
            channel3_ref_t,
            gil::packed_channel_reference<std::uint8_t, 3, 1, true> const
        >::value,
        "3rd element of packed_channel_references_vector should be packed_channel_reference of 3rd channel");

    // double check intermediate metafunction packed_channel_reference_type
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint8_t, mp11::mp_int<0>, mp11::mp_int<1>
            >::type,
            channel1_ref_t
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint8_t, mp11::mp_int<0>, mp11::mp_int<1>
            >::type,
            gil::packed_channel_reference<std::uint8_t, 0, 1, true> const
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
}

void test_packed_pixel_bgr121_assignment()
{
    fixture::packed_pixel_bgr121 p1{0, 3, 1};
    fixture::packed_pixel_bgr121 p2;
    p2 = p1;
    BOOST_TEST_EQ(p1._bitfield, p2._bitfield);
}

void test_packed_pixel_bgr121_equality()
{
    fixture::packed_pixel_bgr121 p1{1, 3, 0};
    fixture::packed_pixel_bgr121 p2{1, 3, 0};
    BOOST_TEST_EQ(p1, p2);

    fixture::packed_pixel_bgr121 p3{0, 3, 1};
    BOOST_TEST_NE(p2, p3);
}

void test_packed_pixel_rgb535_definition()
{
    // Verify packed_pixel members

    static_assert(std::is_same<fixture::packed_pixel_rgb535::layout_t, gil::rgb_layout_t>::value,
        "layout should be bgr");

    static_assert(std::is_same<fixture::packed_pixel_rgb535::value_type, fixture::packed_pixel_rgb535>::value,
        "value_type member should be of the same type as the packed_pixel specialization");

    static_assert(std::is_reference<fixture::packed_pixel_rgb535::reference>::value,
        "reference member should be a reference");

    static_assert(std::is_reference<fixture::packed_pixel_rgb535::const_reference>::value,
        "const_reference member should be a reference");

    static_assert(std::is_same<decltype(fixture::packed_pixel_rgb535::is_mutable), bool const>::value &&
        fixture::packed_pixel_rgb535::is_mutable,
        "is_mutable should be boolean");

    // Verify metafunctions

    static_assert(mp11::mp_size<fixture::packed_channel_references_535>::value == 3,
        "packed_channel_references_vector_type should define three references to channel start bits");

    using channel1_ref_t = mp11::mp_at_c<fixture::packed_channel_references_535, 0>;
    static_assert(channel1_ref_t::num_bits == 5,
        "1st channel of rgb535 pixel should be of 5-bit size");

    using channel2_ref_t = mp11::mp_at_c<fixture::packed_channel_references_535, 1>;
    static_assert(channel2_ref_t::num_bits == 3,
        "2nd channel of rgb535 pixel should be of 3-bit size");

    using channel3_ref_t = mp11::mp_at_c<fixture::packed_channel_references_535, 2>;
    static_assert(channel3_ref_t::num_bits == 5,
        "3rd channel of rgb535 pixel should be of 5-bit size");

    static_assert(std::is_same
        <
            channel1_ref_t,
            gil::packed_channel_reference<std::uint16_t, 0, 5, true> const
        >::value,
        "1st element of packed_channel_references_vector should be packed_channel_reference of 1st channel");

    static_assert(std::is_same
        <
            channel2_ref_t,
            gil::packed_channel_reference<std::uint16_t, 5, 3, true> const
        >::value,
        "2nd element of packed_channel_references_vector should be packed_channel_reference of 2nd channel");

    static_assert(std::is_same
        <
            channel3_ref_t,
            gil::packed_channel_reference<std::uint16_t, 8, 5, true> const
        >::value,
        "3rd element of packed_channel_references_vector should be packed_channel_reference of 3rd channel");

    // double check intermediate metafunction packed_channel_reference_type
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint16_t,
                std::integral_constant<int, 0>,
                std::integral_constant<int, 5>
            >::type,
            channel1_ref_t
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
    static_assert(std::is_same
        <
            gil::detail::packed_channel_reference_type
            <
                std::uint16_t,
                std::integral_constant<int, 0>,
                std::integral_constant<int, 5>
            >::type,
            gil::packed_channel_reference<std::uint16_t, 0, 5, true> const
        >::value,
        "packed_channel_reference_type should return packed_channel_reference");
}

void test_packed_pixel_rgb535_assignment()
{
    fixture::packed_pixel_rgb535 p1{31, 7, 31};
    fixture::packed_pixel_rgb535 p2;
    p2 = p1;
    BOOST_TEST_EQ(p1._bitfield, p2._bitfield);
}

void test_packed_pixel_rgb535_equality()
{
    fixture::packed_pixel_rgb535 p1{7, 3, 7};
    fixture::packed_pixel_rgb535 p2{7, 3, 7};
    BOOST_TEST_EQ(p1, p2);

    fixture::packed_pixel_rgb535 p3{7, 7, 7};
    BOOST_TEST_NE(p2, p3);
}

int main()
{
    test_packed_pixel_gray3_definition();
    test_packed_pixel_gray3_assignment();
    test_packed_pixel_gray3_equality();
    test_packed_pixel_gray3_assignment_gray_channel();
    test_packed_pixel_gray3_equality_gray_channel();
    test_packed_pixel_bgr121_definition();
    test_packed_pixel_bgr121_assignment();
    test_packed_pixel_bgr121_equality();
    test_packed_pixel_rgb535_definition();
    test_packed_pixel_rgb535_assignment();
    test_packed_pixel_rgb535_equality();

    return boost::report_errors();
}