#pragma once

#include "tile.hpp"
#include <array>
#include <Corrade/Containers/ArrayViewStl.h>
#include <Magnum/Magnum.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/GL/Mesh.h>
#include <Magnum/GL/Buffer.h>

namespace Magnum::Examples {

struct tile_shader;
struct chunk;

struct wall_mesh final
{
    wall_mesh();
    void draw(tile_shader& shader, chunk& c);

private:
    static constexpr auto COUNT1 = TILE_MAX_DIM*2, COUNT = COUNT1 * COUNT1;

    using texcoords_array = std::array<Vector2, 4>;
    using position_array = std::array<Vector3, 4>;

    struct vertex final {
        typename texcoords_array::value_type texcoords;
    };

    using quad = std::array<vertex, 4>;
    using vertex_array = std::array<quad, COUNT>;
    using texture_array = std::array<GL::RectangleTexture*, COUNT>;

    static void maybe_add_tile(vertex_array& data, texture_array& textures, tile& x, std::size_t pos);
    static void add_wall(vertex_array& data, texture_array& textures, tile_image& img, std::size_t pos);

    GL::Mesh _mesh;
    GL::Buffer _vertex_buffer{vertex_array{}, Magnum::GL::BufferUsage::DynamicDraw},
               _index_buffer{make_index_array()},
                _positions_buffer{make_position_array()};
    static std::array<std::array<UnsignedShort, 6>, COUNT> make_index_array();
    static std::array<std::array<Vector3, 4>, COUNT> make_position_array();
};

} // namespace Magnum::Examples