/*
    Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>

    This file is part of Magnum.

    Magnum is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License version 3
    only, as published by the Free Software Foundation.

    Magnum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU Lesser General Public License version 3 for more details.
*/

#include <sstream>
#include <TestSuite/Tester.h>
#include <Utility/Configuration.h>

#include "Math/Vector4.h"

struct Vec4 {
    float x, y, z, w;
};

namespace Magnum { namespace Math {

namespace Implementation {

template<> struct VectorConverter<4, float, Vec4> {
    inline constexpr static Vector<4, Float> from(const Vec4& other) {
        return {other.x, other.y, other.z, other.w};
    }

    inline constexpr static Vec4 to(const Vector<4, Float>& other) {
        return {other[0], other[1], other[2], other[3]};
    }
};

}

namespace Test {

class Vector4Test: public Corrade::TestSuite::Tester {
    public:
        Vector4Test();

        void construct();
        void constructDefault();
        void constructOneValue();
        void constructParts();
        void constructConversion();
        void constructCopy();

        void convert();

        void access();
        void threeComponent();
        void twoComponent();

        void debug();
        void configuration();
};

typedef Math::Vector4<Float> Vector4;
typedef Math::Vector4<Int> Vector4i;
typedef Math::Vector3<Float> Vector3;
typedef Math::Vector2<Float> Vector2;

Vector4Test::Vector4Test() {
    addTests({&Vector4Test::construct,
              &Vector4Test::constructDefault,
              &Vector4Test::constructOneValue,
              &Vector4Test::constructParts,
              &Vector4Test::constructConversion,
              &Vector4Test::constructCopy,

              &Vector4Test::convert,

              &Vector4Test::access,
              &Vector4Test::threeComponent,
              &Vector4Test::twoComponent,

              &Vector4Test::debug,
              &Vector4Test::configuration});
}

void Vector4Test::construct() {
    constexpr Vector4 a(1.0f, -2.5f, 3.0f, 4.1f);
    CORRADE_COMPARE(a, (Vector<4, Float>(1.0f, -2.5f, 3.0f, 4.1f)));
}

void Vector4Test::constructDefault() {
    constexpr Vector4 a;
    CORRADE_COMPARE(a, Vector4(0.0f, 0.0f, 0.0f, 0.0f));
}

void Vector4Test::constructOneValue() {
    #ifndef CORRADE_GCC46_COMPATIBILITY
    constexpr Vector4 a(4.3f);
    #else
    Vector4 a(4.3f); /* Not constexpr under GCC < 4.7 */
    #endif
    CORRADE_COMPARE(a, Vector4(4.3f, 4.3f, 4.3f, 4.3f));
}

void Vector4Test::constructParts() {
    constexpr Vector3 a(1.0f, 2.0f, 3.0f);
    constexpr Vector4 b(a, 4.0f);
    CORRADE_COMPARE(b, Vector4(1.0f, 2.0f, 3.0f, 4.0f));
}

void Vector4Test::constructConversion() {
    constexpr Vector4 a(1.0f, -2.5f, 3.0f, 4.1f);
    #ifndef CORRADE_GCC46_COMPATIBILITY
    constexpr Vector4i b(a);
    #else
    Vector4i b(a); /* Not constexpr under GCC < 4.7 */
    #endif
    CORRADE_COMPARE(b, Vector4i(1, -2, 3, 4));
}

void Vector4Test::constructCopy() {
    constexpr Vector4 a(1.0f, -2.5f, 3.0f, 4.1f);
    constexpr Vector4 b(a);
    CORRADE_COMPARE(b, Vector4(1.0f, -2.5f, 3.0f, 4.1f));
}

void Vector4Test::convert() {
    Vec4 a{1.5f, 2.0f, -3.5f, -0.5f};
    Vector4 b(1.5f, 2.0f, -3.5f, -0.5f);
    CORRADE_COMPARE(Vector4(a), b);
    CORRADE_COMPARE(Vec4(b).x, a.x);
    CORRADE_COMPARE(Vec4(b).y, a.y);
    CORRADE_COMPARE(Vec4(b).z, a.z);
    CORRADE_COMPARE(Vec4(b).w, a.w);
}

void Vector4Test::access() {
    Vector4 vec(1.0f, -2.0f, 5.0f, 0.5f);
    CORRADE_COMPARE(vec.x(), 1.0f);
    CORRADE_COMPARE(vec.y(), -2.0f);
    CORRADE_COMPARE(vec.z(), 5.0f);
    CORRADE_COMPARE(vec.w(), 0.5f);

    constexpr Vector4 cvec(1.0f, -2.0f, 5.0f, 0.5f);
    constexpr Float x = cvec.x();
    constexpr Float y = cvec.y();
    constexpr Float z = cvec.z();
    constexpr Float w = cvec.w();
    CORRADE_COMPARE(x, 1.0f);
    CORRADE_COMPARE(y, -2.0f);
    CORRADE_COMPARE(z, 5.0f);
    CORRADE_COMPARE(w, 0.5f);
}

void Vector4Test::threeComponent() {
    Vector4 a(1.0f, 2.0f, 3.0f, 4.0f);
    CORRADE_COMPARE(a.xyz(), Vector3(1.0f, 2.0f, 3.0f));

    constexpr Vector4 b(1.0f, 2.0f, 3.0f, 4.0f);
    constexpr Vector3 c = b.xyz();
    constexpr Float d = b.xyz().y();
    CORRADE_COMPARE(c, Vector3(1.0f, 2.0f, 3.0f));
    CORRADE_COMPARE(d, 2.0f);
}

void Vector4Test::twoComponent() {
    Vector4 a(1.0f, 2.0f, 3.0f, 4.0f);
    CORRADE_COMPARE(a.xy(), Vector2(1.0f, 2.0f));

    constexpr Vector4 b(1.0f, 2.0f, 3.0f, 4.0f);
    constexpr Vector2 c = b.xy();
    constexpr Float d = b.xy().x();
    CORRADE_COMPARE(c, Vector2(1.0f, 2.0f));
    CORRADE_COMPARE(d, 1.0f);
}

void Vector4Test::debug() {
    std::ostringstream o;
    Debug(&o) << Vector4(0.5f, 15.0f, 1.0f, 1.0f);
    CORRADE_COMPARE(o.str(), "Vector(0.5, 15, 1, 1)\n");
}

void Vector4Test::configuration() {
    Corrade::Utility::Configuration c;

    Vector4 vec(3.0f, 3.125f, 9.0f, 9.55f);
    std::string value("3 3.125 9 9.55");

    c.setValue("vector", vec);
    CORRADE_COMPARE(c.value("vector"), value);
    CORRADE_COMPARE(c.value<Vector4>("vector"), vec);
}

}}}

CORRADE_TEST_MAIN(Magnum::Math::Test::Vector4Test)