#include <furi_hal_light.h>
#include <furi.h>
#include <furi_hal.h>
#include <storage/storage.h>
#include <input/input.h>
#include <gui/gui_i.h>
#include <u8g2_glue.h>
#include <lib/toolbox/float_tools.h>
#include "notification.h"
#include "notification_messages.h"
#include "notification_app.h"

#define TAG         "NotificationSrv"
#define COLOR_COUNT (sizeof(colors) / sizeof(RGBBacklightColor))

static const uint8_t minimal_delay = 100;
static const uint8_t led_off_values[NOTIFICATION_LED_COUNT] = {0x00, 0x00, 0x00};

static const uint8_t reset_red_mask = 1 << 0;
static const uint8_t reset_green_mask = 1 << 1;
static const uint8_t reset_blue_mask = 1 << 2;
static const uint8_t reset_vibro_mask = 1 << 3;
static const uint8_t reset_sound_mask = 1 << 4;
static const uint8_t reset_display_mask = 1 << 5;
static const uint8_t reset_blink_mask = 1 << 6;

static void notification_vibro_on(bool force);
static void notification_vibro_off(void);
static void notification_sound_on(float freq, float volume, bool force);
static void notification_sound_off(void);

static uint8_t notification_settings_get_display_brightness(NotificationApp* app, uint8_t value);
static uint8_t notification_settings_get_rgb_led_brightness(NotificationApp* app, uint8_t value);
static uint32_t notification_settings_display_off_delay_ticks(NotificationApp* app);

// --- RGB BACKLIGHT ---

// local variable for local use
uint8_t rgb_backlight_installed_variable = 0;

typedef struct {
    char* name;
    uint8_t red;
    uint8_t green;
    uint8_t blue;
} RGBBacklightColor;

// use one type RGBBacklightColor for current_leds_settings and for static colors definition
static RGBBacklightColor current_led[] = {
    {"LED0", 0, 0, 0},
    {"LED1", 0, 0, 0},
    {"LED2", 0, 0, 0},
};

static const RGBBacklightColor colors[] = {
    {"Orange", 255, 60, 0},
    {"Yellow", 255, 144, 0},
    {"Spring", 167, 255, 0},
    {"Lime", 0, 255, 0},
    {"Aqua", 0, 255, 127},
    {"Cyan", 0, 210, 210},
    {"Azure", 0, 127, 255},
    {"Blue", 0, 0, 255},
    {"Purple", 127, 0, 255},
    {"Magenta", 210, 0, 210},
    {"Pink", 255, 0, 127},
    {"Red", 255, 0, 0},
    {"White", 254, 210, 200},
    {"OFF", 0, 0, 0},
};

uint8_t rgb_backlight_get_color_count(void) {
    return COLOR_COUNT;
}

const char* rgb_backlight_get_color_text(uint8_t index) {
    return colors[index].name;
}

// function for changind local variable from outside;
void set_rgb_backlight_installed_variable(uint8_t var) {
    rgb_backlight_installed_variable = var;
}

// update led current colors by static
void rgb_backlight_set_led_static_color(uint8_t led, uint8_t index) {
    if(led < SK6805_get_led_count()) {
        uint8_t r = colors[index].red;
        uint8_t g = colors[index].green;
        uint8_t b = colors[index].blue;

        current_led[led].red = r;
        current_led[led].green = g;
        current_led[led].blue = b;

        SK6805_set_led_color(led, r, g, b);
    }
}

// HSV to RGB based on
// https://www.radiokot.ru/forum/viewtopic.php?p=3000181&ysclid=m88wvoz34w244644702
// https://radiolaba.ru/microcotrollers/tsvetnaya-lampa.html#comment-1790
// https://alexgyver.ru/lessons/arduino-rgb/?ysclid=m88voflppa24464916
// led number (0-2), hue (0..255), sat (0..255), val (0...1)
void rgb_backlight_set_led_custom_hsv_color(uint8_t led, uint16_t hue, uint8_t sat, float V) {
    // init value
    float r = 1.0f;
    float g = 1.0f;
    float b = 1.0f;

    // from (0..255) to (0..1)
    float H = hue / 255.0f;
    float S = sat / 255.0f;

    uint8_t i = trunc(H * 6);
    float f = H * 6 - i;
    float p = V * (1 - S);
    float q = V * (1 - f * S);
    float t = V * (1 - (1 - f) * S);

    switch(i) {
    case 0:
        r = V, g = t, b = p;
        break;
    case 1:
        r = q, g = V, b = p;
        break;
    case 2:
        r = p, g = V, b = t;
        break;
    case 3:
        r = p, g = q, b = V;
        break;
    case 4:
        r = t, g = p, b = V;
        break;
    case 5:
        r = V, g = p, b = q;
        break;
    }

    // from (0..1) to (0..255)
    current_led[led].red = r * 255;
    current_led[led].green = g * 255;
    current_led[led].blue = b * 255;
}

// set current_* colors to led and update backlight
void rgb_backlight_update(float brightness) {
    if(rgb_backlight_installed_variable > 0) {
        for(uint8_t i = 0; i < SK6805_get_led_count(); i++) {
            uint8_t r = current_led[i].red * brightness * 1.0f;
            uint8_t g = current_led[i].green * brightness * 1.0f;
            uint8_t b = current_led[i].blue * brightness * 1.0f;
            SK6805_set_led_color(i, r, g, b);
        }
        SK6805_update();
    }
}

// start furi timer for rainbow
void rainbow_timer_start(NotificationApp* app) {
    if(furi_timer_is_running(app->rainbow_timer)) {
        furi_timer_stop(app->rainbow_timer);
    }
    furi_timer_start(app->rainbow_timer, furi_ms_to_ticks(app->settings.rgb.rainbow_speed_ms));
}

// stop furi timer for rainbow
void rainbow_timer_stop(NotificationApp* app) {
    if(furi_timer_is_running(app->rainbow_timer)) {
        furi_timer_stop(app->rainbow_timer);
    }
}

// if rgb_backlight_installed then apply rainbow colors to backlight and start/restart/stop rainbow_timer
void rainbow_timer_starter(NotificationApp* app) {
    if((app->settings.rgb.rainbow_mode > 0) && (app->settings.rgb.rgb_backlight_installed)) {
        rainbow_timer_start(app);
    }
}

static void rainbow_timer_callback(void* context) {
    furi_assert(context);
    NotificationApp* app = context;

    if(app->settings.rgb.rgb_backlight_installed) {
        app->rainbow_hue += app->settings.rgb.rainbow_step;
        if(app->rainbow_hue > 254) {
            app->rainbow_hue = 0;
        }

        uint8_t wide = app->settings.rgb.rainbow_wide;

        switch(app->settings.rgb.rainbow_mode) {
        //rainbow mode
        case 1:
            for(uint8_t i = 0; i < SK6805_get_led_count(); i++) {
                rgb_backlight_set_led_custom_hsv_color(
                    i,
                    app->rainbow_hue,
                    app->settings.rgb.rainbow_saturation,
                    app->settings.display_brightness);
            }
            break;

        //wave mode
        case 2:
            uint16_t j = app->rainbow_hue + wide;
            uint16_t k = app->rainbow_hue + wide * 2;

            if(app->rainbow_hue > (254 - wide)) {
                j = j - 255;
            }
            if(app->rainbow_hue > (254 - wide * 2)) {
                k = k - 255;
            }

            rgb_backlight_set_led_custom_hsv_color(
                0,
                app->rainbow_hue,
                app->settings.rgb.rainbow_saturation,
                app->settings.display_brightness);
            rgb_backlight_set_led_custom_hsv_color(
                1, j, app->settings.rgb.rainbow_saturation, app->settings.display_brightness);
            rgb_backlight_set_led_custom_hsv_color(
                2, k, app->settings.rgb.rainbow_saturation, app->settings.display_brightness);
            break;

        default:
            break;
        }

        rgb_backlight_update(app->settings.display_brightness * app->current_night_shift);
    }
}

// --- RGB BACKLIGHT END---

// --- NIGHT SHIFT ---

void night_shift_timer_start(NotificationApp* app) {
    if(app->settings.night_shift != 1) {
        if(furi_timer_is_running(app->night_shift_timer)) {
            furi_timer_stop(app->night_shift_timer);
        }
        furi_timer_start(app->night_shift_timer, furi_ms_to_ticks(2000));
    }
}

void night_shift_timer_stop(NotificationApp* app) {
    if(furi_timer_is_running(app->night_shift_timer)) {
        furi_timer_stop(app->night_shift_timer);
    }
}

// every callback time we check current time and current night_shift_settings value
void night_shift_timer_callback(void* context) {
    furi_assert(context);
    NotificationApp* app = context;
    DateTime current_date_time;

    // take system time and convert to minutes
    furi_hal_rtc_get_datetime(&current_date_time);
    uint32_t time = current_date_time.hour * 60 + current_date_time.minute;

    // if current time not in night_shift range then current_night_shift = 1 else = settings value;
    // set values to stock and rgb backlights
    if((time > app->settings.night_shift_end) && (time < app->settings.night_shift_start)) {
        app->current_night_shift = 1.0f;
    } else {
        app->current_night_shift = app->settings.night_shift;
    }
}

// --- NIGHT SHIFT END ---

void notification_message_save_settings(NotificationApp* app) {
    NotificationAppMessage m = {
        .type = SaveSettingsMessage, .back_event = furi_event_flag_alloc()};
    furi_check(furi_message_queue_put(app->queue, &m, FuriWaitForever) == FuriStatusOk);
    furi_event_flag_wait(
        m.back_event, NOTIFICATION_EVENT_COMPLETE, FuriFlagWaitAny, FuriWaitForever);
    furi_event_flag_free(m.back_event);
}

// internal layer
static void
    notification_apply_internal_led_layer(NotificationLedLayer* layer, uint8_t layer_value) {
    furi_assert(layer);
    furi_assert(layer->index < LayerMAX);

    // set value
    layer->value[LayerInternal] = layer_value;

    // apply if current layer is internal
    if(layer->index == LayerInternal) {
        furi_hal_light_set(layer->light, layer->value[LayerInternal]);
    }
}

static void notification_apply_lcd_contrast(NotificationApp* app) {
    Gui* gui = furi_record_open(RECORD_GUI);
    u8x8_d_st756x_set_contrast(&gui->canvas->fb.u8x8, app->settings.contrast);
    furi_record_close(RECORD_GUI);
}

static bool notification_is_any_led_layer_internal_and_not_empty(NotificationApp* app) {
    bool result = false;
    if((app->led[0].index == LayerInternal) || (app->led[1].index == LayerInternal) ||
       (app->led[2].index == LayerInternal)) {
        if((app->led[0].value[LayerInternal] != 0x00) ||
           (app->led[1].value[LayerInternal] != 0x00) ||
           (app->led[2].value[LayerInternal] != 0x00)) {
            result = true;
        }
    }

    return result;
}

// notification layer
static void notification_apply_notification_led_layer(
    NotificationLedLayer* layer,
    const uint8_t layer_value) {
    furi_assert(layer);
    furi_assert(layer->index < LayerMAX);

    // set value
    layer->index = LayerNotification;
    // set layer
    layer->value[LayerNotification] = layer_value;
    // apply
    furi_hal_light_set(layer->light, layer->value[LayerNotification]);
}

static void notification_reset_notification_led_layer(NotificationLedLayer* layer) {
    furi_assert(layer);
    furi_assert(layer->index < LayerMAX);

    // set value
    layer->value[LayerNotification] = 0;
    // set layer
    layer->index = LayerInternal;

    // apply
    furi_hal_light_set(layer->light, layer->value[LayerInternal]);
}

static void notification_reset_notification_layer(
    NotificationApp* app,
    uint8_t reset_mask,
    float display_brightness_set) {
    if(reset_mask & reset_blink_mask) {
        furi_hal_light_blink_stop();
    }
    if(reset_mask & reset_red_mask) {
        notification_reset_notification_led_layer(&app->led[0]);
    }
    if(reset_mask & reset_green_mask) {
        notification_reset_notification_led_layer(&app->led[1]);
    }
    if(reset_mask & reset_blue_mask) {
        notification_reset_notification_led_layer(&app->led[2]);
    }
    if(reset_mask & reset_vibro_mask) {
        notification_vibro_off();
    }
    if(reset_mask & reset_sound_mask) {
        notification_sound_off();
    }
    if(reset_mask & reset_display_mask) {
        if(!float_is_equal(display_brightness_set, app->settings.display_brightness)) {
            // --- NIGHT SHIFT ---
            furi_hal_light_set(
                LightBacklight,
                app->settings.display_brightness * 0xFF * app->current_night_shift * 1.0f);
            // --- NIGHT SHIFT END---
        }
        if(app->settings.display_off_delay_ms > 0) {
            furi_timer_start(
                app->display_timer, notification_settings_display_off_delay_ticks(app));
        }
    }
}

static void notification_apply_notification_leds(NotificationApp* app, const uint8_t* values) {
    for(uint8_t i = 0; i < NOTIFICATION_LED_COUNT; i++) {
        notification_apply_notification_led_layer(
            &app->led[i], notification_settings_get_rgb_led_brightness(app, values[i]));
    }
}

// settings
uint8_t notification_settings_get_display_brightness(NotificationApp* app, uint8_t value) {
    return value * app->settings.display_brightness;
}

static uint8_t notification_settings_get_rgb_led_brightness(NotificationApp* app, uint8_t value) {
    return value * app->settings.led_brightness;
}

static uint32_t notification_settings_display_off_delay_ticks(NotificationApp* app) {
    return (float)(app->settings.display_off_delay_ms) /
           (1000.0f / furi_kernel_get_tick_frequency());
}

// generics
static void notification_vibro_on(bool force) {
    if(!furi_hal_rtc_is_flag_set(FuriHalRtcFlagStealthMode) || force) {
        furi_hal_vibro_on(true);
    }
}

static void notification_vibro_off(void) {
    furi_hal_vibro_on(false);
}

static void notification_sound_on(float freq, float volume, bool force) {
    if(!furi_hal_rtc_is_flag_set(FuriHalRtcFlagStealthMode) || force) {
        if(furi_hal_speaker_is_mine() || furi_hal_speaker_acquire(30)) {
            furi_hal_speaker_start(freq, volume);
        }
    }
}

static void notification_sound_off(void) {
    if(furi_hal_speaker_is_mine()) {
        furi_hal_speaker_stop();
        furi_hal_speaker_release();
    }
}

// display timer
static void notification_display_timer(void* ctx) {
    furi_assert(ctx);
    NotificationApp* app = ctx;
    notification_message(app, &sequence_display_backlight_off);
}

// message processing
static void notification_process_notification_message(
    NotificationApp* app,
    NotificationAppMessage* message) {
    uint32_t notification_message_index = 0;
    bool force_volume = false;
    bool force_vibro = false;
    const NotificationMessage* notification_message;
    notification_message = (*message->sequence)[notification_message_index];

    bool led_active = false;
    uint8_t led_values[NOTIFICATION_LED_COUNT] = {0x00, 0x00, 0x00};
    bool reset_notifications = true;
    float speaker_volume_setting = app->settings.speaker_volume;
    bool vibro_setting = app->settings.vibro_on;
    float display_brightness_setting = app->settings.display_brightness;

    uint8_t reset_mask = 0;

    while(notification_message != NULL) {
        switch(notification_message->type) {
        case NotificationMessageTypeLedDisplayBacklight:
            // if on - switch on and start timer
            // if off - switch off and stop timer
            // on timer - switch off
            // --- NIGHT SHIFT ---
            if(notification_message->data.led.value > 0x00) {
                notification_apply_notification_led_layer(
                    &app->display,
                    notification_message->data.led.value * display_brightness_setting *
                        app->current_night_shift * 1.0f);
                reset_mask |= reset_display_mask;

                //start rgb_mod_rainbow_timer when display backlight is ON and all corresponding settings is ON too
                rainbow_timer_starter(app);
                // --- NIGHT SHIFT END ---
            } else {
                reset_mask &= ~reset_display_mask;
                notification_reset_notification_led_layer(&app->display);
                if(furi_timer_is_running(app->display_timer)) {
                    furi_timer_stop(app->display_timer);
                }
                //stop rgb_mod_rainbow_timer when display backlight is OFF
                if(furi_timer_is_running(app->rainbow_timer)) {
                    rainbow_timer_stop(app);
                }
            }
            break;
        case NotificationMessageTypeLedDisplayBacklightEnforceOn:
            // --- NIGHT SHIFT ---
            if(!app->display_led_lock) {
                app->display_led_lock = true;
                notification_apply_internal_led_layer(
                    &app->display,
                    notification_message->data.led.value * display_brightness_setting *
                        app->current_night_shift * 1.0f);
            }
            break;
        case NotificationMessageTypeLedDisplayBacklightEnforceAuto:
            if(app->display_led_lock) {
                app->display_led_lock = false;
                notification_apply_internal_led_layer(
                    &app->display,
                    notification_message->data.led.value * display_brightness_setting *
                        app->current_night_shift * 1.0f);
                // --- NIGHT SHIFT END ---
            } else {
                FURI_LOG_E(TAG, "Incorrect BacklightEnforce use");
            }
            break;
        case NotificationMessageTypeLedRed:
            // store and send on delay or after seq
            led_active = true;
            led_values[0] = notification_message->data.led.value;
            app->led[0].value_last[LayerNotification] = led_values[0];
            reset_mask |= reset_red_mask;
            break;
        case NotificationMessageTypeLedGreen:
            // store and send on delay or after seq
            led_active = true;
            led_values[1] = notification_message->data.led.value;
            app->led[1].value_last[LayerNotification] = led_values[1];
            reset_mask |= reset_green_mask;
            break;
        case NotificationMessageTypeLedBlue:
            // store and send on delay or after seq
            led_active = true;
            led_values[2] = notification_message->data.led.value;
            app->led[2].value_last[LayerNotification] = led_values[2];
            reset_mask |= reset_blue_mask;
            break;
        case NotificationMessageTypeLedBlinkStart:
            // store and send on delay or after seq
            led_active = true;
            furi_hal_light_blink_start(
                notification_message->data.led_blink.color,
                app->settings.led_brightness * 255,
                notification_message->data.led_blink.on_time,
                notification_message->data.led_blink.period);
            reset_mask |= reset_blink_mask;
            reset_mask |= reset_red_mask;
            reset_mask |= reset_green_mask;
            reset_mask |= reset_blue_mask;
            break;
        case NotificationMessageTypeLedBlinkColor:
            led_active = true;
            furi_hal_light_blink_set_color(notification_message->data.led_blink.color);
            break;
        case NotificationMessageTypeLedBlinkStop:
            furi_hal_light_blink_stop();
            reset_mask &= ~reset_blink_mask;
            reset_mask |= reset_red_mask;
            reset_mask |= reset_green_mask;
            reset_mask |= reset_blue_mask;
            break;
        case NotificationMessageTypeVibro:
            if(notification_message->data.vibro.on) {
                if(vibro_setting) notification_vibro_on(force_vibro);
            } else {
                notification_vibro_off();
            }
            reset_mask |= reset_vibro_mask;
            break;
        case NotificationMessageTypeSoundOn:
            notification_sound_on(
                notification_message->data.sound.frequency,
                notification_message->data.sound.volume * speaker_volume_setting,
                force_volume);
            reset_mask |= reset_sound_mask;
            break;
        case NotificationMessageTypeSoundOff:
            notification_sound_off();
            reset_mask |= reset_sound_mask;
            break;
        case NotificationMessageTypeDelay:
            if(led_active) {
                if(notification_is_any_led_layer_internal_and_not_empty(app)) {
                    notification_apply_notification_leds(app, led_off_values);
                    furi_delay_ms(minimal_delay);
                }

                led_active = false;

                notification_apply_notification_leds(app, led_values);
                reset_mask |= reset_red_mask;
                reset_mask |= reset_green_mask;
                reset_mask |= reset_blue_mask;
            }

            furi_delay_ms(notification_message->data.delay.length);
            break;
        case NotificationMessageTypeDoNotReset:
            reset_notifications = false;
            break;
        case NotificationMessageTypeForceSpeakerVolumeSetting:
            speaker_volume_setting = notification_message->data.forced_settings.speaker_volume;
            force_volume = true;
            break;
        case NotificationMessageTypeForceVibroSetting:
            vibro_setting = notification_message->data.forced_settings.vibro;
            force_vibro = true;
            break;
        case NotificationMessageTypeForceDisplayBrightnessSetting:
            display_brightness_setting =
                notification_message->data.forced_settings.display_brightness;
            break;
        case NotificationMessageTypeLedBrightnessSettingApply:
            led_active = true;
            for(uint8_t i = 0; i < NOTIFICATION_LED_COUNT; i++) {
                led_values[i] = app->led[i].value_last[LayerNotification];
            }
            reset_mask |= reset_red_mask;
            reset_mask |= reset_green_mask;
            reset_mask |= reset_blue_mask;
            break;
        case NotificationMessageTypeLcdContrastUpdate:
            notification_apply_lcd_contrast(app);
            break;
        }
        notification_message_index++;
        notification_message = (*message->sequence)[notification_message_index];
    };

    // send and do minimal delay
    if(led_active) {
        bool need_minimal_delay = false;
        if(notification_is_any_led_layer_internal_and_not_empty(app)) {
            need_minimal_delay = true;
        }

        notification_apply_notification_leds(app, led_values);
        reset_mask |= reset_red_mask;
        reset_mask |= reset_green_mask;
        reset_mask |= reset_blue_mask;

        if((need_minimal_delay) && (reset_notifications)) {
            notification_apply_notification_leds(app, led_off_values);
            furi_delay_ms(minimal_delay);
        }
    }

    if(reset_notifications) {
        notification_reset_notification_layer(app, reset_mask, display_brightness_setting);
    }
}

static void
    notification_process_internal_message(NotificationApp* app, NotificationAppMessage* message) {
    uint32_t notification_message_index = 0;
    const NotificationMessage* notification_message;
    notification_message = (*message->sequence)[notification_message_index];

    while(notification_message != NULL) {
        switch(notification_message->type) {
        case NotificationMessageTypeLedDisplayBacklight:
            notification_apply_internal_led_layer(
                &app->display,
                notification_settings_get_display_brightness(
                    app, notification_message->data.led.value));
            break;
        case NotificationMessageTypeLedRed:
            app->led[0].value_last[LayerInternal] = notification_message->data.led.value;
            notification_apply_internal_led_layer(
                &app->led[0],
                notification_settings_get_rgb_led_brightness(
                    app, notification_message->data.led.value));
            break;
        case NotificationMessageTypeLedGreen:
            app->led[1].value_last[LayerInternal] = notification_message->data.led.value;
            notification_apply_internal_led_layer(
                &app->led[1],
                notification_settings_get_rgb_led_brightness(
                    app, notification_message->data.led.value));
            break;
        case NotificationMessageTypeLedBlue:
            app->led[2].value_last[LayerInternal] = notification_message->data.led.value;
            notification_apply_internal_led_layer(
                &app->led[2],
                notification_settings_get_rgb_led_brightness(
                    app, notification_message->data.led.value));
            break;
        case NotificationMessageTypeLedBrightnessSettingApply:
            for(uint8_t i = 0; i < NOTIFICATION_LED_COUNT; i++) {
                uint8_t new_val = notification_settings_get_rgb_led_brightness(
                    app, app->led[i].value_last[LayerInternal]);
                notification_apply_internal_led_layer(&app->led[i], new_val);
            }
            break;
        default:
            break;
        }
        notification_message_index++;
        notification_message = (*message->sequence)[notification_message_index];
    }
}

static bool notification_load_settings(NotificationApp* app) {
    NotificationSettings settings;
    File* file = storage_file_alloc(furi_record_open(RECORD_STORAGE));
    const size_t settings_size = sizeof(NotificationSettings);

    FURI_LOG_I(TAG, "Loading \"%s\"", NOTIFICATION_SETTINGS_PATH);
    bool fs_result =
        storage_file_open(file, NOTIFICATION_SETTINGS_PATH, FSAM_READ, FSOM_OPEN_EXISTING);

    if(fs_result) {
        size_t bytes_count = storage_file_read(file, &settings, settings_size);

        if(bytes_count != settings_size) {
            fs_result = false;
        }
    }

    if(fs_result) {
        if(settings.version != NOTIFICATION_SETTINGS_VERSION) {
            FURI_LOG_E(
                TAG, "version(%d != %d) mismatch", settings.version, NOTIFICATION_SETTINGS_VERSION);
        } else {
            furi_kernel_lock();
            memcpy(&app->settings, &settings, settings_size);
            furi_kernel_unlock();
        }
    } else {
        FURI_LOG_E(TAG, "Load failed, %s", storage_file_get_error_desc(file));
    }

    storage_file_close(file);
    storage_file_free(file);
    furi_record_close(RECORD_STORAGE);

    return fs_result;
}

static bool notification_save_settings(NotificationApp* app) {
    NotificationSettings settings;
    File* file = storage_file_alloc(furi_record_open(RECORD_STORAGE));
    const size_t settings_size = sizeof(NotificationSettings);

    FURI_LOG_I(TAG, "Saving \"%s\"", NOTIFICATION_SETTINGS_PATH);

    furi_kernel_lock();
    memcpy(&settings, &app->settings, settings_size);
    furi_kernel_unlock();

    bool fs_result =
        storage_file_open(file, NOTIFICATION_SETTINGS_PATH, FSAM_WRITE, FSOM_CREATE_ALWAYS);

    if(fs_result) {
        size_t bytes_count = storage_file_write(file, &settings, settings_size);

        if(bytes_count != settings_size) {
            fs_result = false;
        }
    }

    if(fs_result) {
    } else {
        FURI_LOG_E(TAG, "Save failed, %s", storage_file_get_error_desc(file));
    }

    storage_file_close(file);
    storage_file_free(file);
    furi_record_close(RECORD_STORAGE);

    return fs_result;
}

static void input_event_callback(const void* value, void* context) {
    furi_assert(value);
    furi_assert(context);
    NotificationApp* app = context;
    notification_message(app, &sequence_display_backlight_on);
}

// App alloc
static NotificationApp* notification_app_alloc(void) {
    NotificationApp* app = malloc(sizeof(NotificationApp));
    app->queue = furi_message_queue_alloc(8, sizeof(NotificationAppMessage));
    app->display_timer = furi_timer_alloc(notification_display_timer, FuriTimerTypeOnce, app);

    app->settings.speaker_volume = 1.0f;
    app->settings.display_brightness = 1.0f;
    app->settings.led_brightness = 1.0f;
    app->settings.display_off_delay_ms = 30000;
    app->settings.vibro_on = true;

    app->display.value[LayerInternal] = 0x00;
    app->display.value[LayerNotification] = 0x00;
    app->display.index = LayerInternal;
    app->display.light = LightBacklight;

    app->led[0].value[LayerInternal] = 0x00;
    app->led[0].value[LayerNotification] = 0x00;
    app->led[0].index = LayerInternal;
    app->led[0].light = LightRed;

    app->led[1].value[LayerInternal] = 0x00;
    app->led[1].value[LayerNotification] = 0x00;
    app->led[1].index = LayerInternal;
    app->led[1].light = LightGreen;

    app->led[2].value[LayerInternal] = 0x00;
    app->led[2].value[LayerNotification] = 0x00;
    app->led[2].index = LayerInternal;
    app->led[2].light = LightBlue;

    app->settings.version = NOTIFICATION_SETTINGS_VERSION;

    // display backlight control
    app->event_record = furi_record_open(RECORD_INPUT_EVENTS);
    furi_pubsub_subscribe(app->event_record, input_event_callback, app);
    notification_message(app, &sequence_display_backlight_on);

    // --- NIGHT SHIFT ---
    app->current_night_shift = 1.0f;
    app->current_night_shift = 1.0f;
    app->settings.night_shift = 1.0f;
    app->settings.night_shift_start = 1020;
    app->settings.night_shift_end = 300;
    app->night_shift_timer =
        furi_timer_alloc(night_shift_timer_callback, FuriTimerTypePeriodic, app);
    // --- NIGHT SHIFT END ---

    // init working variables
    app->rainbow_hue = 1;
    app->current_night_shift = 1.0f;

    // init rgb.segings values
    app->settings.rgb.rgb_backlight_installed = 0;
    app->settings.rgb.led_2_color_index = 0;
    app->settings.rgb.led_1_color_index = 0;
    app->settings.rgb.led_0_color_index = 0;
    app->settings.rgb.rainbow_speed_ms = 100;
    app->settings.rgb.rainbow_step = 1;
    app->settings.rgb.rainbow_saturation = 255;
    app->settings.rgb.rainbow_wide = 50;

    // set inital value, later it will be rewriten by loading settings from file
    app->settings.lcd_inversion = false;

    return app;
}

static void notification_storage_callback(const void* message, void* context) {
    furi_assert(context);
    NotificationApp* app = context;
    const StorageEvent* event = message;

    if(event->type == StorageEventTypeCardMount) {
        NotificationAppMessage m = {
            .type = LoadSettingsMessage,
        };

        furi_check(furi_message_queue_put(app->queue, &m, FuriWaitForever) == FuriStatusOk);
    }
}

static void notification_apply_settings(NotificationApp* app) {
    if(!notification_load_settings(app)) {
        notification_save_settings(app);
    }

    notification_apply_lcd_contrast(app);

    // --- NIGHT SHIFT ---
    // if night_shift enabled then start timer for controlling current_night_shift multiplicator value depent from current time
    if(app->settings.night_shift != 1) {
        night_shift_timer_start(app);
    }
    // --- NIGHT SHIFT END ---

    // check RECORD_GUI is exist (insurance on boot time) then use it to setup lcd inversion mode from loaded settings;
    if(furi_record_exists(RECORD_GUI)) {
        Gui* gui = furi_record_open(RECORD_GUI);
        u8x8_d_st756x_set_inversion(&gui->canvas->fb.u8x8, app->settings.lcd_inversion);
        furi_record_close(RECORD_GUI);
    }
}

static void notification_init_settings(NotificationApp* app) {
    Storage* storage = furi_record_open(RECORD_STORAGE);
    furi_pubsub_subscribe(storage_get_pubsub(storage), notification_storage_callback, app);

    if(storage_sd_status(storage) != FSE_OK) {
        FURI_LOG_D(TAG, "SD Card not ready, skipping settings");
        return;
    }

    notification_apply_settings(app);
}

// App
int32_t notification_srv(void* p) {
    UNUSED(p);
    NotificationApp* app = notification_app_alloc();

    notification_init_settings(app);

    notification_vibro_off();
    notification_sound_off();
    notification_apply_internal_led_layer(&app->display, 0x00);
    notification_apply_internal_led_layer(&app->led[0], 0x00);
    notification_apply_internal_led_layer(&app->led[1], 0x00);
    notification_apply_internal_led_layer(&app->led[2], 0x00);

    furi_record_create(RECORD_NOTIFICATION, app);

    // --- RGB BACKLIGHT SECTION ---

    //setup local variable
    set_rgb_backlight_installed_variable(app->settings.rgb.rgb_backlight_installed);

    // define rainbow_timer and they callback
    app->rainbow_timer = furi_timer_alloc(rainbow_timer_callback, FuriTimerTypePeriodic, app);

    // if rgb_backlight_installed then start rainbow or set leds colors from saved settings (default index = 0)
    if(app->settings.rgb.rgb_backlight_installed) {
        if(app->settings.rgb.rainbow_mode > 0) {
            rainbow_timer_start(app);
        } else {
            rgb_backlight_set_led_static_color(2, app->settings.rgb.led_2_color_index);
            rgb_backlight_set_led_static_color(1, app->settings.rgb.led_1_color_index);
            rgb_backlight_set_led_static_color(0, app->settings.rgb.led_0_color_index);
            rgb_backlight_update(app->settings.display_brightness * app->current_night_shift);
        }
        // if rgb_backlight not installed then set default static orange color(index=0) to all leds (0-2) and force light on
    } else {
        rgb_backlight_set_led_static_color(2, 0);
        rgb_backlight_set_led_static_color(1, 0);
        rgb_backlight_set_led_static_color(0, 0);
        SK6805_update();
    }

    // --- RGB BACKLIGHT SECTION END ---

    NotificationAppMessage message;
    while(1) {
        furi_check(furi_message_queue_get(app->queue, &message, FuriWaitForever) == FuriStatusOk);

        switch(message.type) {
        case NotificationLayerMessage:
            notification_process_notification_message(app, &message);
            break;
        case InternalLayerMessage:
            notification_process_internal_message(app, &message);
            break;
        case SaveSettingsMessage:
            notification_save_settings(app);
            break;
        case LoadSettingsMessage:
            notification_load_settings(app);
            break;
        }

        if(message.back_event != NULL) {
            furi_event_flag_set(message.back_event, NOTIFICATION_EVENT_COMPLETE);
        }
    }

    return 0;
}