#pragma once

#include <cstddef>
#include <optional>
#include <string>
#include <string_view>

#include <modulus/types.hpp>

#include <vamp_zero/types.hpp>


namespace vamp_zero {

auto selected_group(vamp_zero::app_state const &state) -> vamp_zero::song_group const *;
auto selected_part(vamp_zero::app_state const &state) -> vamp_zero::library_part const *;
auto active_part(vamp_zero::app_state const &state) -> vamp_zero::library_part const *;
auto selected_practice_type(vamp_zero::app_state const &state) -> vamp_zero::practice_type_group const *;
auto selected_practice_lesson(vamp_zero::app_state const &state) -> vamp_zero::practice_lesson_group const *;
auto selected_practice_exercise(vamp_zero::app_state const &state) -> vamp_zero::practice_exercise const *;
auto active_practice(vamp_zero::app_state const &state) -> vamp_zero::practice_exercise const *;
auto supports_key_selection(vamp_zero::practice_exercise const &exercise) -> std::bool_t;
auto selected_practice_variant(vamp_zero::app_state const &state, vamp_zero::practice_exercise const &exercise) -> vamp_zero::practice_exercise::score_variant const *;
auto selected_practice_key(vamp_zero::app_state const &state, vamp_zero::practice_exercise const &exercise) -> std::optional<std::string_view>;
auto practice_key_row_count(vamp_zero::app_state const &state) -> std::size_t;
auto effective_practice_key(vamp_zero::app_state const &state, vamp_zero::practice_exercise const &exercise) -> std::string;
auto active_pages(vamp_zero::app_state const &state) -> std::size_t;
auto practice_fallback_menu(vamp_zero::app_state const &state) -> vamp_zero::app_mode;

}