#ifndef SHARED_MATH_HH_
#define SHARED_MATH_HH_

#include <compare>

#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>

namespace shared {
namespace math {

// 2D coordinates.
struct coords {
    std::int32_t x;
    std::int32_t z;
    coords operator+(const coords& c) const noexcept {
        auto ret = *this;
        ret.x += c.x;
        ret.z += c.z;
        return ret;
    }
    coords operator-(const coords& c) const noexcept {
        auto ret = *this;
        ret.x -= c.x;
        ret.z -= c.z;
        return ret;
    }
    auto operator<=>(const coords& c) const noexcept = default;
};

struct angles {
    float pitch;
    float yaw;
    angles operator+(const angles& a) const noexcept {
        auto ret = *this;
        ret.pitch += a.pitch;
        ret.yaw += a.yaw;
        return ret;
    }
};

// Returns a vector pointing in the direction of pitch + yaw.
glm::vec3 angle_to_dir(const angles& ang) noexcept;

bool is_inside_draw(const shared::math::coords& a,
                    const shared::math::coords& b,
                    const std::int32_t draw_distance) noexcept;

} // namespace math
} // namespace shared

#endif