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d7919f148d072bf7d3d9fdfc86182e48a942842f
product-vamp/src/vamp_zero/page_control.cpp
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khodowany d7919f148d
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2026-09-08 08:53:41 -05:00

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#include <vamp_zero/page_control.hpp>
#include <algorithm>
#include <cstdint>
#include <expected>
#include <optional>
#include <sstream>
#include <string>
#include <string_view>
#include <utility>
#include <boost/json/array.hpp>
#include <boost/json/object.hpp>
#include <boost/json/value.hpp>
#include <vamp_zero/errors.hpp>
#include <vamp_zero/navigation.hpp>
namespace {
constexpr auto main_menu_count = std::size_t{2};
auto wrap_next(std::size_t value, std::size_t count) -> std::size_t {
if (count == 0U) {
return 0U;
}
return (value + 1U) % count;
}
auto wrap_previous(std::size_t value, std::size_t count) -> std::size_t {
if (count == 0U) {
return 0U;
}
return value == 0U ? count - 1U : value - 1U;
}
auto menu_row_count(std::size_t item_count) -> std::size_t {
return item_count + 1U;
}
auto clamp_state(vamp_zero::app_state state) -> vamp_zero::app_state {
state.selected_main_menu_index = std::min(state.selected_main_menu_index, main_menu_count - 1U);
state.selected_song_index = std::min(state.selected_song_index, menu_row_count(state.performance.groups.size()) - 1U);
if (auto const* group = selected_group(state); group != nullptr) {
state.selected_part_index = std::min(state.selected_part_index, menu_row_count(group->parts.size()) - 1U);
} else {
state.selected_part_index = 0U;
}
state.selected_practice_type_index = std::min(state.selected_practice_type_index, menu_row_count(state.practice.types.size()) - 1U);
if (auto const* type = selected_practice_type(state); type != nullptr) {
state.selected_practice_lesson_index = std::min(state.selected_practice_lesson_index, menu_row_count(type->lesson_groups.size()) - 1U);
} else {
state.selected_practice_lesson_index = 0U;
}
if (auto const* lesson = selected_practice_lesson(state); lesson != nullptr) {
state.selected_practice_exercise_index = std::min(state.selected_practice_exercise_index, menu_row_count(lesson->exercises.size()) - 1U);
} else {
state.selected_practice_exercise_index = 0U;
}
state.selected_practice_key_index = std::min(state.selected_practice_key_index, practice_key_row_count(state) - 1U);
if (state.mode == vamp_zero::app_mode::PERFORMANCE_PART_MENU && selected_group(state) == nullptr) {
state.mode = vamp_zero::app_mode::PERFORMANCE_SONG_MENU;
}
if (state.mode == vamp_zero::app_mode::PRACTICE_LESSON_MENU && selected_practice_type(state) == nullptr) {
state.mode = vamp_zero::app_mode::PRACTICE_TYPE_MENU;
}
if (state.mode == vamp_zero::app_mode::PRACTICE_EXERCISE_MENU && selected_practice_lesson(state) == nullptr) {
state.mode = selected_practice_type(state) == nullptr ? vamp_zero::app_mode::PRACTICE_TYPE_MENU : vamp_zero::app_mode::PRACTICE_LESSON_MENU;
}
if (state.mode == vamp_zero::app_mode::PRACTICE_KEY_MENU) {
auto const* exercise = selected_practice_exercise(state);
if (exercise == nullptr) {
state.mode = practice_fallback_menu(state);
} else if (!supports_key_selection(*exercise) || exercise->variants.empty()) {
state.mode = vamp_zero::app_mode::PRACTICE_EXERCISE_MENU;
state.selected_practice_key_index = 0U;
}
}
if (state.mode == vamp_zero::app_mode::PERFORMANCE_SCORE && active_part(state) == nullptr) {
state.mode = selected_group(state) == nullptr ? vamp_zero::app_mode::PERFORMANCE_SONG_MENU : vamp_zero::app_mode::PERFORMANCE_PART_MENU;
state.active_part_id.clear();
state.page_index = 0;
} else if (state.mode == vamp_zero::app_mode::PRACTICE_SCORE) {
auto const* exercise = active_practice(state);
if (exercise == nullptr) {
state.mode = practice_fallback_menu(state);
state.active_practice_id.clear();
state.page_index = 0;
} else if (selected_practice_variant(state, *exercise) == nullptr) {
state.mode = vamp_zero::app_mode::PRACTICE_KEY_MENU;
state.active_practice_id.clear();
state.page_index = 0;
}
}
if (auto pages = active_pages(state); pages != 0U) {
state.page_index = std::min(state.page_index, pages - 1U);
} else if (state.mode != vamp_zero::app_mode::PERFORMANCE_SCORE && state.mode != vamp_zero::app_mode::PRACTICE_SCORE) {
state.page_index = 0;
}
return state;
}
auto command_json(vamp_zero::app_state const& state) -> boost::json::object {
auto commands = boost::json::object{};
commands["last"] = state.last_command;
commands["next_count"] = state.next_count;
commands["previous_count"] = state.previous_count;
commands["select_count"] = state.select_count;
commands["heartbeat_count"] = state.heartbeat_count;
return commands;
}
auto part_json(vamp_zero::library_part const& part) -> boost::json::object {
auto result = boost::json::object{};
result["id"] = part.id;
result["title"] = part.title;
result["composer"] = part.composer;
result["key_signature"] = part.key_signature;
result["part"] = part.part;
result["source_path"] = part.source_path;
result["measures"] = static_cast<std::uint64_t>(part.measure_count);
result["pages"] = static_cast<std::uint64_t>(part.total_pages);
return result;
}
auto exercise_json(vamp_zero::practice_exercise const& exercise) -> boost::json::object {
auto variants = boost::json::array{};
for (auto const& variant : exercise.variants) {
auto item = boost::json::object{};
item["id"] = variant.id;
item["key_signature"] = variant.key_signature;
item["source_path"] = variant.source_path;
item["measures"] = static_cast<std::uint64_t>(variant.measure_count);
item["pages"] = static_cast<std::uint64_t>(variant.total_pages);
variants.push_back(std::move(item));
}
auto result = boost::json::object{};
result["id"] = exercise.id;
result["practice_type_id"] = exercise.practice_type_id;
result["practice_type_title"] = exercise.practice_type_title;
result["lesson_group_id"] = exercise.lesson_group_id;
result["lesson_group_title"] = exercise.lesson_group_title;
result["supports_key_selection"] = supports_key_selection(exercise);
result["title"] = exercise.title;
result["composer"] = exercise.composer;
result["key_signature"] = exercise.key_signature;
result["source_path"] = exercise.source_path;
result["measures"] = static_cast<std::uint64_t>(exercise.measure_count);
result["pages"] = static_cast<std::uint64_t>(exercise.total_pages);
result["variant_count"] = static_cast<std::uint64_t>(exercise.variants.size());
result["variants"] = std::move(variants);
return result;
}
auto lesson_json(vamp_zero::practice_lesson_group const& lesson) -> boost::json::object {
auto exercises = boost::json::array{};
for (auto const& exercise : lesson.exercises) {
exercises.push_back(exercise_json(exercise));
}
auto result = boost::json::object{};
result["id"] = lesson.id;
result["title"] = lesson.title;
result["exercise_count"] = static_cast<std::uint64_t>(lesson.exercises.size());
result["exercises"] = std::move(exercises);
return result;
}
auto practice_type_exercise_count(vamp_zero::practice_type_group const& type) -> std::size_t {
auto count = std::size_t{};
for (auto const& lesson : type.lesson_groups) {
count += lesson.exercises.size();
}
return count;
}
auto type_json(vamp_zero::practice_type_group const& type) -> boost::json::object {
auto lessons = boost::json::array{};
for (auto const& lesson : type.lesson_groups) {
lessons.push_back(lesson_json(lesson));
}
auto result = boost::json::object{};
result["id"] = type.id;
result["title"] = type.title;
result["lesson_group_count"] = static_cast<std::uint64_t>(type.lesson_groups.size());
result["exercise_count"] = static_cast<std::uint64_t>(practice_type_exercise_count(type));
result["lesson_groups"] = std::move(lessons);
return result;
}
auto performance_json(vamp_zero::app_state const& state) -> boost::json::object {
auto groups = boost::json::array{};
for (auto const& group : state.performance.groups) {
auto parts = boost::json::array{};
for (auto const& part : group.parts) {
parts.push_back(part_json(part));
}
auto item = boost::json::object{};
item["title"] = group.title;
item["composer"] = group.composer;
item["parts"] = std::move(parts);
groups.push_back(std::move(item));
}
auto library = boost::json::object{};
library["song_count"] = static_cast<std::uint64_t>(state.performance.groups.size());
library["part_count"] = static_cast<std::uint64_t>(state.performance.parts.size());
library["groups"] = std::move(groups);
return library;
}
auto practice_json(vamp_zero::app_state const& state) -> boost::json::object {
auto types = boost::json::array{};
for (auto const& type : state.practice.types) {
types.push_back(type_json(type));
}
auto exercises = boost::json::array{};
for (auto const& exercise : state.practice.exercises) {
exercises.push_back(exercise_json(exercise));
}
auto keys = boost::json::array{};
for (auto key : vamp_zero::practice_key_names()) {
keys.push_back(boost::json::value{std::string{key}});
}
auto selection = boost::json::object{};
selection["type_row_index"] = static_cast<std::uint64_t>(state.selected_practice_type_index);
selection["lesson_row_index"] = static_cast<std::uint64_t>(state.selected_practice_lesson_index);
selection["exercise_row_index"] = static_cast<std::uint64_t>(state.selected_practice_exercise_index);
selection["key_row_index"] = static_cast<std::uint64_t>(state.selected_practice_key_index);
if (auto const* type = selected_practice_type(state); type != nullptr) {
selection["type"] = type_json(*type);
}
if (auto const* lesson = selected_practice_lesson(state); lesson != nullptr) {
selection["lesson_group"] = lesson_json(*lesson);
}
if (auto const* exercise = selected_practice_exercise(state); exercise != nullptr) {
selection["exercise"] = exercise_json(*exercise);
auto variant = selected_practice_variant(state, *exercise);
if (variant != nullptr) {
auto item = boost::json::object{};
item["id"] = variant->id;
item["key_signature"] = variant->key_signature;
item["source_path"] = variant->source_path;
item["measures"] = static_cast<std::uint64_t>(variant->measure_count);
item["pages"] = static_cast<std::uint64_t>(variant->total_pages);
selection["variant"] = std::move(item);
}
}
if (auto const* exercise = selected_practice_exercise(state); exercise != nullptr) {
if (auto key = selected_practice_key(state, *exercise)) {
selection["key"] = std::string{*key};
}
}
auto practice = boost::json::object{};
practice["type_count"] = static_cast<std::uint64_t>(state.practice.types.size());
practice["exercise_count"] = static_cast<std::uint64_t>(state.practice.exercises.size());
practice["types"] = std::move(types);
practice["exercises"] = std::move(exercises);
practice["key_count"] = static_cast<std::uint64_t>(vamp_zero::practice_key_names().size());
practice["keys"] = std::move(keys);
practice["selection"] = std::move(selection);
return practice;
}
auto sanitize_line_value(std::string value) -> std::string {
for (auto& ch : value) {
if (ch == '\r' || ch == '\n') {
ch = ' ';
}
}
return value;
}
}
auto vamp_zero::apply_app_command(vamp_zero::app_state state, vamp_protocol::page_command command) -> vamp_zero::app_state {
state = clamp_state(std::move(state));
if (command == vamp_protocol::page_command::NEXT) {
++state.next_count;
} else if (command == vamp_protocol::page_command::PREVIOUS) {
++state.previous_count;
} else {
++state.select_count;
}
state.last_command = vamp_protocol::page_command_name(command);
switch (state.mode) {
case vamp_zero::app_mode::MAIN_MENU:
if (command == vamp_protocol::page_command::NEXT) {
state.selected_main_menu_index = wrap_next(state.selected_main_menu_index, main_menu_count);
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_main_menu_index = wrap_previous(state.selected_main_menu_index, main_menu_count);
} else if (state.selected_main_menu_index == 0U) {
state.mode = vamp_zero::app_mode::PERFORMANCE_SONG_MENU;
state.selected_song_index = 0;
state.selected_part_index = 0;
state.active_part_id.clear();
state.page_index = 0;
} else {
state.mode = vamp_zero::app_mode::PRACTICE_TYPE_MENU;
state.selected_practice_type_index = 0;
state.selected_practice_lesson_index = 0;
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
state.active_practice_id.clear();
state.page_index = 0;
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PERFORMANCE_SONG_MENU:
if (command == vamp_protocol::page_command::NEXT) {
state.selected_song_index = wrap_next(state.selected_song_index, menu_row_count(state.performance.groups.size()));
state.selected_part_index = 0;
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_song_index = wrap_previous(state.selected_song_index, menu_row_count(state.performance.groups.size()));
state.selected_part_index = 0;
} else if (state.selected_song_index == 0U) {
state.mode = vamp_zero::app_mode::MAIN_MENU;
} else {
state.mode = vamp_zero::app_mode::PERFORMANCE_PART_MENU;
state.selected_part_index = 0;
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PERFORMANCE_PART_MENU:
if (auto const* group = selected_group(state); group != nullptr) {
if (command == vamp_protocol::page_command::NEXT) {
state.selected_part_index = wrap_next(state.selected_part_index, menu_row_count(group->parts.size()));
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_part_index = wrap_previous(state.selected_part_index, menu_row_count(group->parts.size()));
} else if (state.selected_part_index == 0U) {
state.mode = vamp_zero::app_mode::PERFORMANCE_SONG_MENU;
state.active_part_id.clear();
state.page_index = 0;
} else if (auto const* part = selected_part(state); part != nullptr) {
state.active_part_id = part->id;
state.active_practice_id.clear();
state.page_index = 0;
state.mode = vamp_zero::app_mode::PERFORMANCE_SCORE;
}
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PERFORMANCE_SCORE:
if (auto const* part = active_part(state); part != nullptr) {
if (command == vamp_protocol::page_command::NEXT) {
state.page_index = std::min(state.page_index + 1U, part->total_pages == 0U ? 0U : part->total_pages - 1U);
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.page_index = state.page_index == 0U ? 0U : state.page_index - 1U;
} else {
state.mode = vamp_zero::app_mode::PERFORMANCE_PART_MENU;
state.active_part_id.clear();
state.page_index = 0;
}
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PRACTICE_TYPE_MENU:
if (command == vamp_protocol::page_command::NEXT) {
state.selected_practice_type_index = wrap_next(state.selected_practice_type_index, menu_row_count(state.practice.types.size()));
state.selected_practice_lesson_index = 0;
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_practice_type_index = wrap_previous(state.selected_practice_type_index, menu_row_count(state.practice.types.size()));
state.selected_practice_lesson_index = 0;
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
} else if (state.selected_practice_type_index == 0U) {
state.mode = vamp_zero::app_mode::MAIN_MENU;
} else {
state.mode = vamp_zero::app_mode::PRACTICE_LESSON_MENU;
state.selected_practice_lesson_index = 0;
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PRACTICE_LESSON_MENU:
if (auto const* type = selected_practice_type(state); type != nullptr) {
if (command == vamp_protocol::page_command::NEXT) {
state.selected_practice_lesson_index = wrap_next(state.selected_practice_lesson_index, menu_row_count(type->lesson_groups.size()));
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_practice_lesson_index = wrap_previous(state.selected_practice_lesson_index, menu_row_count(type->lesson_groups.size()));
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
} else if (state.selected_practice_lesson_index == 0U) {
state.mode = vamp_zero::app_mode::PRACTICE_TYPE_MENU;
state.active_practice_id.clear();
state.page_index = 0;
} else {
state.mode = vamp_zero::app_mode::PRACTICE_EXERCISE_MENU;
state.selected_practice_exercise_index = 0;
state.selected_practice_key_index = 0;
}
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PRACTICE_EXERCISE_MENU:
if (auto const* lesson = selected_practice_lesson(state); lesson != nullptr) {
if (command == vamp_protocol::page_command::NEXT) {
state.selected_practice_exercise_index = wrap_next(state.selected_practice_exercise_index, menu_row_count(lesson->exercises.size()));
state.selected_practice_key_index = 0;
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_practice_exercise_index = wrap_previous(state.selected_practice_exercise_index, menu_row_count(lesson->exercises.size()));
state.selected_practice_key_index = 0;
} else if (state.selected_practice_exercise_index == 0U) {
state.mode = vamp_zero::app_mode::PRACTICE_LESSON_MENU;
state.active_practice_id.clear();
state.page_index = 0;
} else if (auto const* exercise = selected_practice_exercise(state); exercise != nullptr) {
state.active_part_id.clear();
state.active_practice_id.clear();
state.page_index = 0;
if (supports_key_selection(*exercise) && !exercise->variants.empty()) {
state.mode = vamp_zero::app_mode::PRACTICE_KEY_MENU;
state.selected_practice_key_index = 0;
} else {
state.active_practice_id = exercise->id;
state.selected_practice_key_index = 0;
state.mode = vamp_zero::app_mode::PRACTICE_SCORE;
}
}
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PRACTICE_KEY_MENU:
if (auto const* exercise = selected_practice_exercise(state); exercise != nullptr && supports_key_selection(*exercise)) {
if (command == vamp_protocol::page_command::NEXT) {
state.selected_practice_key_index = wrap_next(state.selected_practice_key_index, menu_row_count(exercise->variants.size()));
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.selected_practice_key_index = wrap_previous(state.selected_practice_key_index, menu_row_count(exercise->variants.size()));
} else if (state.selected_practice_key_index == 0U) {
state.mode = vamp_zero::app_mode::PRACTICE_EXERCISE_MENU;
state.active_practice_id.clear();
state.page_index = 0;
} else if (selected_practice_variant(state, *exercise) != nullptr) {
state.active_practice_id = exercise->id;
state.active_part_id.clear();
state.page_index = 0;
state.mode = vamp_zero::app_mode::PRACTICE_SCORE;
}
}
return clamp_state(std::move(state));
case vamp_zero::app_mode::PRACTICE_SCORE:
if (auto const* exercise = active_practice(state); exercise != nullptr) {
auto const* variant = selected_practice_variant(state, *exercise);
if (command == vamp_protocol::page_command::NEXT) {
auto pages = variant == nullptr ? 0U : variant->total_pages;
state.page_index = std::min(state.page_index + 1U, pages == 0U ? 0U : pages - 1U);
} else if (command == vamp_protocol::page_command::PREVIOUS) {
state.page_index = state.page_index == 0U ? 0U : state.page_index - 1U;
} else {
state.mode = supports_key_selection(*exercise) ? vamp_zero::app_mode::PRACTICE_KEY_MENU : vamp_zero::app_mode::PRACTICE_EXERCISE_MENU;
state.active_practice_id.clear();
state.page_index = 0;
}
}
return clamp_state(std::move(state));
}
return clamp_state(std::move(state));
}
auto vamp_zero::app_status_json(vamp_zero::app_state const& state) -> boost::json::value {
auto selection = boost::json::object{};
selection["main_menu_index"] = static_cast<std::uint64_t>(state.selected_main_menu_index);
selection["song_row_index"] = static_cast<std::uint64_t>(state.selected_song_index);
selection["part_row_index"] = static_cast<std::uint64_t>(state.selected_part_index);
if (auto const* group = selected_group(state); group != nullptr) {
selection["title"] = group->title;
selection["composer"] = group->composer;
}
if (auto const* part = selected_part(state); part != nullptr) {
selection["part"] = part_json(*part);
}
auto active = boost::json::object{};
if (state.mode == vamp_zero::app_mode::PERFORMANCE_SCORE) {
if (auto const* part = active_part(state); part != nullptr) {
active["selected"] = true;
active["kind"] = "performance";
active["part"] = part_json(*part);
active["page_index"] = static_cast<std::uint64_t>(state.page_index);
active["page_number"] = static_cast<std::uint64_t>(state.page_index + 1U);
active["page_total"] = static_cast<std::uint64_t>(part->total_pages);
}
} else if (state.mode == vamp_zero::app_mode::PRACTICE_SCORE) {
if (auto const* exercise = active_practice(state); exercise != nullptr) {
auto const* variant = selected_practice_variant(state, *exercise);
active["selected"] = true;
active["kind"] = "practice";
active["exercise"] = exercise_json(*exercise);
active["key"] = effective_practice_key(state, *exercise);
active["page_index"] = static_cast<std::uint64_t>(state.page_index);
active["page_number"] = static_cast<std::uint64_t>(state.page_index + 1U);
active["page_total"] = static_cast<std::uint64_t>(variant == nullptr ? 0U : variant->total_pages);
}
}
if (active.empty()) {
active["selected"] = false;
active["page_index"] = 0;
active["page_number"] = 0;
active["page_total"] = 0;
}
auto remote = boost::json::object{};
remote["pico_connected"] = state.pico_connected;
remote["heartbeat_count"] = state.heartbeat_count;
auto performance = performance_json(state);
auto root = boost::json::object{};
root["mode"] = vamp_zero::to_string(state.mode);
root["library"] = performance;
root["performance"] = std::move(performance);
root["practice"] = practice_json(state);
root["selection"] = std::move(selection);
root["active"] = std::move(active);
root["commands"] = command_json(state);
root["remote"] = std::move(remote);
return root;
}
auto vamp_zero::remote_display_text(vamp_zero::app_state const& state) -> std::string {
auto title = std::string{};
auto part = std::string{};
auto page = std::size_t{};
auto pages = std::size_t{};
auto active = false;
if (state.mode == vamp_zero::app_mode::PERFORMANCE_SCORE) {
if (auto const* selected = active_part(state); selected != nullptr) {
active = true;
title = selected->title;
part = selected->part;
page = state.page_index + 1U;
pages = selected->total_pages;
}
} else if (state.mode == vamp_zero::app_mode::PRACTICE_SCORE) {
if (auto const* selected = active_practice(state); selected != nullptr) {
auto const* variant = selected_practice_variant(state, *selected);
active = true;
title = selected->title;
part = "Key: " + effective_practice_key(state, *selected);
page = state.page_index + 1U;
pages = variant == nullptr ? 0U : variant->total_pages;
}
}
auto output = std::ostringstream{};
output << "version=1\n";
output << "mode=" << vamp_zero::to_string(state.mode) << "\n";
output << "active=" << (active ? "1" : "0") << "\n";
output << "title=" << sanitize_line_value(title) << "\n";
output << "part=" << sanitize_line_value(part) << "\n";
output << "page=" << page << "\n";
output << "pages=" << pages << "\n";
return output.str();
}
auto vamp_zero::validate_app_state(vamp_zero::app_state const& state) -> std::expected<void, modulus::error> {
if (state.selected_main_menu_index >= main_menu_count) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected main menu index is out of range"));
}
if (state.selected_song_index >= menu_row_count(state.performance.groups.size())) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected performance song row is out of range"));
}
if (auto const* group = selected_group(state); group != nullptr && state.selected_part_index >= menu_row_count(group->parts.size())) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected performance part row is out of range"));
}
if (state.selected_practice_type_index >= menu_row_count(state.practice.types.size())) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected practice type row is out of range"));
}
if (auto const* type = selected_practice_type(state); type != nullptr && state.selected_practice_lesson_index >= menu_row_count(type->lesson_groups.size())) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected practice lesson row is out of range"));
}
if (auto const* lesson = selected_practice_lesson(state); lesson != nullptr && state.selected_practice_exercise_index >= menu_row_count(lesson->exercises.size())) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected practice exercise row is out of range"));
}
if (state.selected_practice_key_index >= practice_key_row_count(state)) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "selected practice key row is out of range"));
}
if (state.mode == vamp_zero::app_mode::PRACTICE_LESSON_MENU && selected_practice_type(state) == nullptr) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice lesson mode requires a selected practice type"));
}
if (state.mode == vamp_zero::app_mode::PRACTICE_EXERCISE_MENU && selected_practice_lesson(state) == nullptr) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice exercise mode requires a selected lesson group"));
}
if (state.mode == vamp_zero::app_mode::PRACTICE_KEY_MENU) {
auto const* exercise = selected_practice_exercise(state);
if (exercise == nullptr || !supports_key_selection(*exercise)) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice key mode requires a melody exercise"));
}
}
if (state.mode == vamp_zero::app_mode::PERFORMANCE_SCORE) {
auto const* part = active_part(state);
if (part == nullptr) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "performance score mode requires an active part"));
}
if (part->total_pages == 0U || state.page_index >= part->total_pages) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "performance score page index is out of range"));
}
}
if (state.mode == vamp_zero::app_mode::PRACTICE_SCORE) {
auto const* exercise = active_practice(state);
if (exercise == nullptr) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice score mode requires an active exercise"));
}
auto const* variant = selected_practice_variant(state, *exercise);
if (variant == nullptr) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice score mode requires a selected generated variant"));
}
if (variant->total_pages == 0U || state.page_index >= variant->total_pages) {
return std::unexpected(vamp_zero::make_error(vamp_zero::error_code::INVALID_ARGUMENT, "practice score page index is out of range"));
}
}
return {};
}
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