#pragma once

#include "assets/components/material_components.hpp"
#include "assets/components/mesh_vertex_components.hpp"
#include "shading/features/mesh_features.hpp"
#include "util/enum_bitfield_operators.hpp"

#include <array>

namespace rendering::requirements::mesh
{

struct type
{
 shading::features::mesh::indices::type shader_program_requirement_index{};
 components::mesh_vertex::flags vertex_requirements{
  components::mesh_vertex::flags::none
 };
 components::material::flags material_requirements{
  components::material::flags::none
 };
};

enum class flags : std::uint8_t
{
 none = 0,
 position = 1 << 0,
 lit = 1 << 1,
 textured = 1 << 2,
 uniform_color = 1 << 3,
 uniform_alpha = 1 << 4,
 point = 1 << 5
};

constexpr inline auto position = type{
 .shader_program_requirement_index = shading::features::mesh::indices::position,
 .vertex_requirements = components::mesh_vertex::flags::position
};

constexpr inline auto lit = type{
 .shader_program_requirement_index = shading::features::mesh::indices::lit,
 .vertex_requirements = components::mesh_vertex::flags::normal,
 .material_requirements = components::material::flags::surface_properties
};

constexpr inline auto point = type{
    .shader_program_requirement_index = shading::features::mesh::indices::point
};

constexpr inline auto textured = type{
 .shader_program_requirement_index = shading::features::mesh::indices::textured,
 .vertex_requirements = components::mesh_vertex::flags::tex_coord,
 .material_requirements = components::material::flags::texture,
};

constexpr inline auto uniform_color = type{
 .shader_program_requirement_index = shading::features::mesh::indices::uniform_color
};

constexpr inline auto uniform_alpha = type{
 .shader_program_requirement_index = shading::features::mesh::indices::uniform_alpha,
 .material_requirements = components::material::flags::transparency
};

constexpr inline auto all = std::array{
 position, lit,  textured, uniform_color, uniform_alpha, point
};

}

DEFINE_ENUM_BITFIELD_OPERATORS(rendering::requirements::mesh::flags)