/*
Crafter®.Graphics
Copyright (C) 2025 Catcrafts®
Catcrafts.net

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3.0 of the License, or (at your option) any later version.

This library 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 for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
*/

export module Crafter.Graphics:Types;
import std;

namespace Crafter {
    export struct MousePoint {
        std::int_fast32_t x;
        std::int_fast32_t y;
    };
    
    export struct MouseMoveEvent {
        MousePoint lastMousePos;
        MousePoint currentMousePos;
        MousePoint mouseDelta;
    };

    export struct ScaleData {
        std::int_fast32_t x;
		std::int_fast32_t y;
		std::int_fast32_t width;
		std::int_fast32_t height;
    };
    
    export struct __attribute__((packed)) Pixel_BU8_GU8_RU8_AU8 {
        std::uint8_t b;
        std::uint8_t g;
        std::uint8_t r;
        std::uint8_t a;
    };

    export struct __attribute__((packed)) Pixel_RU8_GU8_BU8_AU8 {
        std::uint8_t r;
        std::uint8_t g;
        std::uint8_t b;
        std::uint8_t a;
    };

    export struct __attribute__((packed)) Vertex {
        float x;
        float y;
        float z;
        float w;
    };
    export struct __attribute__((packed)) VertexUV {
        float x;
        float y;
        float z;
        float w;

        float u;
        float v;

        float pad[2];
    };

    export struct __attribute__((packed)) VertexRGBA {
        float x;
        float y;
        float z;
        float w;

        float r;
        float g;
        float b;
        float a;
    };

    export struct __attribute__((packed)) HeightRGBA {
        float height;

        float pad[3];

        float r;
        float g;
        float b;
        float a;
    };



    export constexpr std::int_fast32_t BOUND = 9;
    export constexpr std::int_fast32_t SCALE = std::numeric_limits<std::int_fast32_t>::max() / BOUND;
    export constexpr double SCALEDOUBLE = static_cast<double>(std::numeric_limits<std::int_fast32_t>::max()) / BOUND;

    export constexpr std::int_fast32_t SCALEBOUNDLESS = std::numeric_limits<std::int_fast32_t>::max();
    export constexpr double SCALEDOUBLEBOUNDLESS = static_cast<double>(std::numeric_limits<std::int_fast32_t>::max());

    export constexpr std::int_fast32_t FractionalToMapped(double f) {
        return std::int_fast32_t(f * SCALEDOUBLE);
    }

    export constexpr double MappedToFractional(std::int_fast32_t mapped) {
        return static_cast<double>(mapped) / SCALEDOUBLE;
    }

    export constexpr std::int_fast32_t MappedToPixel(std::int_fast32_t mapped, std::int_fast32_t width) {
        return mapped / (SCALE / width);
    }

    export constexpr std::int_fast32_t PixelToMapped(std::int_fast32_t pixel, std::int_fast32_t width) {
        return pixel * (SCALE / width);
    }

    export constexpr std::int_fast32_t BoundToBoundless(std::int_fast32_t bound) {
        return bound * BOUND;
    }

    export constexpr std::int_fast32_t FractionalToMappedBoundless(double f) {
        return std::int_fast32_t(f * SCALEDOUBLEBOUNDLESS);
    }

    export constexpr double MappedToFractionalBoundless(std::int_fast32_t mapped) {
        return static_cast<double>(mapped) / SCALEDOUBLEBOUNDLESS;
    }

    export constexpr std::int_fast32_t MappedToPixelBoundless(std::int_fast32_t mapped, std::int_fast32_t width) {
        return mapped / (SCALEBOUNDLESS / width);
    }

    export constexpr std::int_fast32_t PixelToMappedBoundless(std::int_fast32_t pixel, std::int_fast32_t width) {
        return pixel * (SCALEBOUNDLESS / width);
    }

    // export constexpr double bound = 10;

    // export constexpr std::uint_fast32_t FractionalToMapped(double fractional) {
    //     constexpr double min_x = -bound;
    //     constexpr double max_x = bound + 1.0;
    //     constexpr double range_x = max_x - min_x;

    //     constexpr double MAXD = static_cast<double>(
    //         std::numeric_limits<std::uint_fast32_t>::max()
    //     );

    //     // Normalize to [0,1]
    //     double t = (fractional - min_x) / range_x;

    //     // Clamp (important for constexpr safety and edge behavior)
    //     if (t < 0.0) t = 0.0;
    //     if (t > 1.0) t = 1.0;

    //     return static_cast<std::uint_fast32_t>(t * MAXD);
    // }

    // export constexpr double MappedToFractional(std::uint_fast32_t mapped) {
    //     constexpr double min_x = -bound;
    //     constexpr double max_x = bound + 1.0;
    //     constexpr double range_x = max_x - min_x;

    //     constexpr double MAXD = static_cast<double>(
    //         std::numeric_limits<std::uint_fast32_t>::max()
    //     );

    //     double t = static_cast<double>(mapped) / MAXD;

    //     return min_x + t * range_x;
    // }

    // export constexpr std::int_fast32_t MappedToPixel(std::uint_fast32_t mapped, std::uint_fast32_t size) {
    //     constexpr double MAXD = static_cast<double>(
    //         std::numeric_limits<std::uint_fast32_t>::max()
    //     );

    //     // scale mapped ∈ [0, MAX] to pixel ∈ [0, size]
    //     double t = static_cast<double>(mapped) / MAXD;

    //     // Clamp (shouldn't be necessary, but protects constexpr eval)
    //     if (t < 0.0) t = 0.0;
    //     if (t > 1.0) t = 1.0;

    //     return static_cast<std::int_fast32_t>(t * static_cast<double>(size));
    // }
}