#include "app_settings.h"

#include "esp_log.h"
#include "nvs.h"
#include "nvs_flash.h"

#define SETTINGS_NAMESPACE          "radick"
#define SETTINGS_KEY_BRIGHTNESS     "brightness"
#define SETTINGS_KEY_SOUND          "sound"
#define DEFAULT_BRIGHTNESS_PERCENT  78U
#define DEFAULT_SOUND_ENABLED       true

static const char *TAG = "settings";
static nvs_handle_t s_nvs;
static bool s_ready;

static esp_err_t init_nvs_partition(void)
{
    esp_err_t err = nvs_flash_init();
    if (err == ESP_ERR_NVS_NO_FREE_PAGES || err == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        err = nvs_flash_erase();
        if (err != ESP_OK) {
            return err;
        }
        err = nvs_flash_init();
    }
    return err;
}

esp_err_t app_settings_init(app_settings_t *settings)
{
    if (settings == NULL) {
        return ESP_ERR_INVALID_ARG;
    }

    settings->brightness_percent = DEFAULT_BRIGHTNESS_PERCENT;
    settings->sound_enabled = DEFAULT_SOUND_ENABLED;

    esp_err_t err = init_nvs_partition();
    if (err != ESP_OK) {
        ESP_LOGW(TAG, "NVS unavailable: %s", esp_err_to_name(err));
        return err;
    }

    err = nvs_open(SETTINGS_NAMESPACE, NVS_READWRITE, &s_nvs);
    if (err != ESP_OK) {
        return err;
    }
    s_ready = true;

    uint8_t value = 0;
    if (nvs_get_u8(s_nvs, SETTINGS_KEY_BRIGHTNESS, &value) == ESP_OK &&
        value >= 10U && value <= 100U) {
        settings->brightness_percent = value;
    }
    if (nvs_get_u8(s_nvs, SETTINGS_KEY_SOUND, &value) == ESP_OK) {
        settings->sound_enabled = value != 0U;
    }
    return ESP_OK;
}

esp_err_t app_settings_set_brightness(uint8_t percent)
{
    if (percent < 10U || percent > 100U) {
        return ESP_ERR_INVALID_ARG;
    }
    if (!s_ready) {
        return ESP_ERR_INVALID_STATE;
    }
    esp_err_t err = nvs_set_u8(s_nvs, SETTINGS_KEY_BRIGHTNESS, percent);
    return err == ESP_OK ? nvs_commit(s_nvs) : err;
}

esp_err_t app_settings_set_sound(bool enabled)
{
    if (!s_ready) {
        return ESP_ERR_INVALID_STATE;
    }
    esp_err_t err = nvs_set_u8(s_nvs, SETTINGS_KEY_SOUND, enabled ? 1U : 0U);
    return err == ESP_OK ? nvs_commit(s_nvs) : err;
}