os_settings_intf.hpp

// Copyright Take Vos 2022.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "theme_mode.hpp"
#include "subpixel_orientation.hpp"
#include "../i18n/i18n.hpp"
#include "../geometry/module.hpp"
#include "../utility/utility.hpp"
#include "../numeric/module.hpp"
#include "../observer/module.hpp"
#include "../dispatch/dispatch.hpp"
#include "../macros.hpp"
#include <vector>
#include <mutex>
#include <expected>
#include <system_error>
 
hi_export_module(hikogui.settings.os_settings : intf);
 
namespace hi::inline v1 {
 
class os_settings {
public:
    using notifier_type = notifier<>;
    using callback_token = notifier_type::callback_token;
    using callback_proto = notifier_type::callback_proto;
 
    [[nodiscard]] static std::vector<language_tag> language_tags() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        hilet lock = std::scoped_lock(_mutex);
        return _language_tags;
    }
 
    [[nodiscard]] static std::locale locale() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        hilet lock = std::scoped_lock(_mutex);
        return _locale;
    }
 
 
    [[nodiscard]] static bool left_to_right() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _left_to_right.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static hi::theme_mode theme_mode() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _theme_mode.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static hi::subpixel_orientation subpixel_orientation() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _subpixel_orientation.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static bool uniform_HDR() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _uniform_HDR.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::chrono::milliseconds double_click_interval() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _double_click_interval.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static float double_click_distance() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _double_click_distance.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::chrono::milliseconds keyboard_repeat_delay() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _keyboard_repeat_delay.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::chrono::milliseconds keyboard_repeat_interval() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _keyboard_repeat_interval.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::chrono::milliseconds cursor_blink_delay() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _cursor_blink_delay.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::chrono::milliseconds cursor_blink_interval() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _cursor_blink_interval.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static float minimum_window_width() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _minimum_window_width.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static float minimum_window_height() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _minimum_window_height.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static float maximum_window_width() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _maximum_window_width.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static float maximum_window_height() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _maximum_window_height.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static aarectangle primary_monitor_rectangle() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        hilet lock = std::scoped_lock(_mutex);
        return _primary_monitor_rectangle;
    }
 
    [[nodiscard]] static uintptr_t primary_monitor_id() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _primary_monitor_id.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static aarectangle desktop_rectangle() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        hilet lock = std::scoped_lock(_mutex);
        return _desktop_rectangle;
    }
 
    [[nodiscard]] static hi::policy policy() noexcept
    {
        return policy::unspecified;
    }
 
    [[nodiscard]] static hi::policy gpu_policy() noexcept
    {
        hi_axiom(_populated.load(std::memory_order::acquire));
        return _gpu_policy.load(std::memory_order::relaxed);
    }
 
    [[nodiscard]] static std::vector<uuid> preferred_gpus(hi::policy performance_policy) noexcept;
 
    [[nodiscard]] static callback_token
    subscribe(forward_of<callback_proto> auto&& callback, callback_flags flags = callback_flags::synchronous) noexcept
    {
        hilet lock = std::scoped_lock(_mutex);
        return _notifier.subscribe(hi_forward(callback), flags);
    }
 
    static bool start_subsystem() noexcept
    {
        return hi::start_subsystem(_started, false, subsystem_init, subsystem_deinit);
    }
 
    static void gather() noexcept
    {
        hilet lock = std::scoped_lock(_mutex);
        auto setting_has_changed = false;
 
        hilet current_time = std::chrono::utc_clock::now();
        if (current_time < _gather_last_time + gather_minimum_interval) {
            return;
        }
        _gather_last_time = current_time;
 
        try {
            auto language_tags = gather_languages();
            if (language_tags.empty()) {
                // If not language is configured on the system, use English as default.
                language_tags.emplace_back("en-Latn-US");
            }
 
            auto left_to_right = language_tags.front().left_to_right();
 
            // Add all the variants of languages, for searching into translations.
            language_tags = variants(language_tags);
 
            auto language_changed = compare_store(_language_tags, language_tags);
            language_changed |= compare_store(_left_to_right, left_to_right);
 
            if (language_changed) {
                setting_has_changed = true;
                hi_log_info("OS language order has changed: {}", _language_tags);
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS language: {}", e.what());
        }
 
        if (auto optional_locale = gather_locale()) {
            if (compare_store(_locale, *optional_locale)) {
                setting_has_changed = true;
                hi_log_info("OS locale has changed: {}", _locale.name());
            }
        } else {
            hi_log_error("Failed to get OS locale: {}", optional_locale.error().message());
        }
 
        try {
            if (compare_store(_theme_mode, gather_theme_mode())) {
                setting_has_changed = true;
                hi_log_info("OS theme-mode has changed: {}", _theme_mode.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS theme-mode: {}", e.what());
        }
 
        try {
            if (compare_store(_subpixel_orientation, gather_subpixel_orientation())) {
                setting_has_changed = true;
                hi_log_info("OS sub-pixel orientation has changed: {}", _subpixel_orientation.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS sub-pixel orientation: {}", e.what());
        }
 
        try {
            if (compare_store(_uniform_HDR, gather_uniform_HDR())) {
                setting_has_changed = true;
                hi_log_info("OS uniform-HDR has changed: {}", _uniform_HDR.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS uniform-HDR: {}", e.what());
        }
 
        try {
            if (compare_store(_double_click_interval, gather_double_click_interval())) {
                setting_has_changed = true;
                hi_log_info("OS double click interval has changed: {}", _double_click_interval.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS double click interval: {}", e.what());
        }
 
        try {
            if (compare_store(_double_click_distance, gather_double_click_distance())) {
                setting_has_changed = true;
                hi_log_info("OS double click distance has changed: {}", _double_click_distance.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS double click distance: {}", e.what());
        }
 
        try {
            if (compare_store(_keyboard_repeat_delay, gather_keyboard_repeat_delay())) {
                setting_has_changed = true;
                hi_log_info("OS keyboard repeat delay has changed: {}", _keyboard_repeat_delay.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS keyboard repeat delay: {}", e.what());
        }
 
        try {
            if (compare_store(_keyboard_repeat_interval, gather_keyboard_repeat_interval())) {
                setting_has_changed = true;
                hi_log_info("OS keyboard repeat interval has changed: {}", _keyboard_repeat_interval.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS keyboard repeat interval: {}", e.what());
        }
 
        try {
            if (compare_store(_cursor_blink_interval, gather_cursor_blink_interval())) {
                setting_has_changed = true;
                if (_cursor_blink_interval.load() < std::chrono::minutes(1)) {
                    hi_log_info("OS cursor blink interval has changed: {}", _cursor_blink_interval.load());
                } else {
                    hi_log_info("OS cursor blink interval has changed: no-blinking");
                }
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS cursor blink interval: {}", e.what());
        }
 
        try {
            if (compare_store(_cursor_blink_delay, gather_cursor_blink_delay())) {
                setting_has_changed = true;
                hi_log_info("OS cursor blink delay has changed: {}", _cursor_blink_delay.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS cursor blink delay: {}", e.what());
        }
 
        try {
            if (compare_store(_minimum_window_width, gather_minimum_window_width())) {
                setting_has_changed = true;
                hi_log_info("OS minimum window width has changed: {}", _minimum_window_width.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS minimum window width: {}", e.what());
        }
 
        try {
            if (compare_store(_minimum_window_height, gather_minimum_window_height())) {
                setting_has_changed = true;
                hi_log_info("OS minimum window height has changed: {}", _minimum_window_height.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS minimum window height: {}", e.what());
        }
 
        try {
            if (compare_store(_maximum_window_width, gather_maximum_window_width())) {
                setting_has_changed = true;
                hi_log_info("OS maximum window width has changed: {}", _maximum_window_width.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS maximum window width: {}", e.what());
        }
 
        try {
            if (compare_store(_maximum_window_height, gather_maximum_window_height())) {
                setting_has_changed = true;
                hi_log_info("OS maximum window height has changed: {}", _maximum_window_height.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS maximum window height: {}", e.what());
        }
 
        try {
            hilet primary_monitor_id = gather_primary_monitor_id();
            if (compare_store(_primary_monitor_id, primary_monitor_id)) {
                setting_has_changed = true;
                hi_log_info("OS primary monitor id has changed: {}, updating vsync source", primary_monitor_id);
                loop::main().set_vsync_monitor_id(primary_monitor_id);
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS primary monitor id: {}", e.what());
        }
 
        try {
            if (compare_store(_primary_monitor_rectangle, gather_primary_monitor_rectangle())) {
                setting_has_changed = true;
                hi_log_info("OS primary monitor rectangle has changed: {}", _primary_monitor_rectangle);
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS primary monitor rectangle: {}", e.what());
        }
 
        try {
            if (compare_store(_desktop_rectangle, gather_desktop_rectangle())) {
                setting_has_changed = true;
                hi_log_info("OS desktop rectangle has changed: {}", _desktop_rectangle);
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get OS desktop rectangle: {}", e.what());
        }
 
        try {
            if (compare_store(_gpu_policy, gather_gpu_policy())) {
                setting_has_changed = true;
                hi_log_info("GPU policy has changed: {}", _gpu_policy.load());
            }
        } catch (std::exception const& e) {
            hi_log_error("Failed to get the GPU policy: {}", e.what());
        }
 
        _populated.store(true, std::memory_order::release);
        if (setting_has_changed) {
            _notifier();
        }
    }
 
private:
    constexpr static std::chrono::duration gather_interval = std::chrono::seconds(5);
    constexpr static std::chrono::duration gather_minimum_interval = std::chrono::seconds(1);
 
    static inline std::atomic<bool> _started = false;
    static inline std::atomic<bool> _populated = false;
    static inline unfair_mutex _mutex;
    static inline loop::timer_callback_token _gather_cbt;
    static inline utc_nanoseconds _gather_last_time;
 
    static inline notifier_type _notifier;
 
    static inline std::vector<language_tag> _language_tags = {};
    static inline std::locale _locale = std::locale{""};
    static inline std::atomic<bool> _left_to_right = true;
    static inline std::atomic<hi::theme_mode> _theme_mode = theme_mode::dark;
    static inline std::atomic<bool> _uniform_HDR = false;
    static inline std::atomic<hi::subpixel_orientation> _subpixel_orientation = hi::subpixel_orientation::unknown;
    static inline std::atomic<std::chrono::milliseconds> _double_click_interval = std::chrono::milliseconds(500);
    static inline std::atomic<float> _double_click_distance = 4.0f;
    static inline std::atomic<std::chrono::milliseconds> _keyboard_repeat_delay = std::chrono::milliseconds(250);
    static inline std::atomic<std::chrono::milliseconds> _keyboard_repeat_interval = std::chrono::milliseconds(33);
    static inline std::atomic<std::chrono::milliseconds> _cursor_blink_interval = std::chrono::milliseconds(1000);
    static inline std::atomic<std::chrono::milliseconds> _cursor_blink_delay = std::chrono::milliseconds(1000);
    static inline std::atomic<float> _minimum_window_width = 40.0f;
    static inline std::atomic<float> _minimum_window_height = 25.0f;
    static inline std::atomic<float> _maximum_window_width = 1920.0f;
    static inline std::atomic<float> _maximum_window_height = 1080.0f;
    static inline std::atomic<uintptr_t> _primary_monitor_id = 0;
    static inline aarectangle _primary_monitor_rectangle = aarectangle{0.0f, 0.0f, 1920.0f, 1080.0f};
    static inline aarectangle _desktop_rectangle = aarectangle{0.0f, 0.0f, 1920.0f, 1080.0f};
    static inline std::atomic<hi::policy> _gpu_policy = policy::unspecified;
 
    [[nodiscard]] static bool subsystem_init() noexcept
    {
        _gather_cbt = loop::timer().repeat_function(gather_interval, [] {
            os_settings::gather();
        });
 
        return true;
    }
 
    static void subsystem_deinit() noexcept
    {
        if (_started.exchange(false)) {
            _gather_cbt = nullptr;
        }
    }
 
    [[nodiscard]] static std::vector<language_tag> gather_languages();
    [[nodiscard]] static std::expected<std::locale, std::error_code> gather_locale() noexcept;
    [[nodiscard]] static hi::theme_mode gather_theme_mode();
    [[nodiscard]] static hi::subpixel_orientation gather_subpixel_orientation();
    [[nodiscard]] static bool gather_uniform_HDR();
    [[nodiscard]] static std::chrono::milliseconds gather_double_click_interval();
    [[nodiscard]] static float gather_double_click_distance();
    [[nodiscard]] static std::chrono::milliseconds gather_keyboard_repeat_delay();
    [[nodiscard]] static std::chrono::milliseconds gather_keyboard_repeat_interval();
    [[nodiscard]] static std::chrono::milliseconds gather_cursor_blink_interval();
    [[nodiscard]] static std::chrono::milliseconds gather_cursor_blink_delay();
    [[nodiscard]] static float gather_minimum_window_width();
    [[nodiscard]] static float gather_minimum_window_height();
    [[nodiscard]] static float gather_maximum_window_width();
    [[nodiscard]] static float gather_maximum_window_height();
    [[nodiscard]] static uintptr_t gather_primary_monitor_id();
    [[nodiscard]] static aarectangle gather_primary_monitor_rectangle();
    [[nodiscard]] static aarectangle gather_desktop_rectangle();
    [[nodiscard]] static hi::policy gather_gpu_policy();
};
 
} // namespace hi::inline v1