/*****************************************************include files **************************************************************************/
#include "screen_brightness.h"
#include "LVGL/lvgl_init.h"
#include "ui.h"
/******************************************************* variable declaration ************************************************************************/

/*
 * 亮度模型：UI/BLE 的 0~100% 线性映射到面板 PWM [BRIGHTNESS_PWM_MIN, BRIGHTNESS_PWM_MAX]。
 * 选 55 作为下限：约 21.5% 全量程，且 (255-55)=200，duty = 55 + percent*2，0~100 与整数 PWM 一一对应、无除法舍入误差。
 * 若硬件需其它暗场门限，只改 BRIGHTNESS_PWM_MIN（需保持 SPAN 与映射公式一致或同步改除法）。
 */
#define BRIGHTNESS_PWM_MIN   55
#define BRIGHTNESS_PWM_MAX   255
#define BRIGHTNESS_PWM_SPAN  (BRIGHTNESS_PWM_MAX - BRIGHTNESS_PWM_MIN)

// 当前面板 PWM（BRIGHTNESS_PWM_MIN~BRIGHTNESS_PWM_MAX）；未读 NVS 前取中间偏亮，避免明显过暗
uint8_t g_current_brightness = (uint8_t)(BRIGHTNESS_PWM_MIN + BRIGHTNESS_PWM_SPAN * 3 / 4);
static bool g_brightness_dirty  = false;
static uint8_t g_brightness_commit_pending = 0;

static TimerHandle_t g_brightness_commit_timer = NULL;

/******************************************************* functions declaration ************************************************************************/


void save_brightness_to_nvs(uint8_t value); /* forward declaration for timer callback */
void commit_brightness_if_dirty(void);

extern esp_err_t panel_qspi_amoled_set_brightness(esp_lcd_panel_handle_t panel, uint8_t brightness);


/******************************************************* functions definition ************************************************************************/

// 保存亮度到 NVS
void save_brightness_to_nvs(uint8_t value)
{
    nvs_handle_t my_handle;
    esp_err_t err = nvs_open("system_cfg", NVS_READWRITE, &my_handle);
    if (err == ESP_OK)
    {
        nvs_set_u8(my_handle, "brightness", value);
        nvs_commit(my_handle);
        nvs_close(my_handle);
        // ESP_LOGI("NVS", "亮度已保存: %d", value);
    }
}

static void brightness_commit_timer_cb(TimerHandle_t xTimer)
{
    (void)xTimer;
    save_brightness_to_nvs(g_brightness_commit_pending);
}

// 从 NVS 读取亮度
void load_brightness_from_nvs(void)
{
    nvs_handle_t my_handle;
    esp_err_t err = nvs_open("system_cfg", NVS_READONLY, &my_handle);
    if (err == ESP_OK)
    {
        uint8_t saved_val = 0;
        if (nvs_get_u8(my_handle, "brightness", &saved_val) == ESP_OK)
        {
            g_current_brightness = saved_val;
            if (g_current_brightness < BRIGHTNESS_PWM_MIN)
                g_current_brightness = BRIGHTNESS_PWM_MIN; 
            if (g_current_brightness > BRIGHTNESS_PWM_MAX)
                g_current_brightness = BRIGHTNESS_PWM_MAX;
            ESP_LOGI("NVS", "加载保存的亮度: %d", g_current_brightness);
        }
        nvs_close(my_handle);
    }
}

// ================= 对外接口 =================

// 设置亮度 (供 UI 和 BLE 调用)
// 参数 percent: 0-100，0 对应 PWM_MIN、100 对应 PWM_MAX
void set_system_brightness(int percent)
{
    if (percent < 0)
        percent = 0;
    if (percent > 100)
        percent = 100;

    uint8_t duty = (uint8_t)(BRIGHTNESS_PWM_MIN + ((unsigned)percent * BRIGHTNESS_PWM_SPAN) / 100U);

    // 3. 应用到硬件
    if (panel_handle)
    {
        panel_qspi_amoled_set_brightness(panel_handle, duty);
    }

    // 4. 更新全局变量并保存
    if (g_current_brightness != duty)
    {
        g_current_brightness = duty;
        g_brightness_dirty = true;
        request_brightness_slider_sync();
    }
    /* BLE/UI 共用：有变更时经定时器落盘 NVS（避免在回调里同步写） */
    commit_brightness_if_dirty();
}

/* 退出亮度界面时调用：只写一次 NVS，避免频繁保存导致不稳定 */
void commit_brightness_if_dirty(void)
{
    if (!g_brightness_dirty)
        return;
    g_brightness_commit_pending = g_current_brightness;
    g_brightness_dirty = false;
    /* NVS 写放到 timer 任务上下文，避免在 LVGL 点击事件回调里同步写导致崩溃 */
    if (g_brightness_commit_timer == NULL)
    {
        g_brightness_commit_timer = xTimerCreate("brightness_commit_tmr",
                                                   pdMS_TO_TICKS(50),
                                                   pdFALSE,
                                                   NULL,
                                                   brightness_commit_timer_cb);
    }
    if (g_brightness_commit_timer)
    {
        xTimerStop(g_brightness_commit_timer, 0);
        if (xTimerStart(g_brightness_commit_timer, 0) != pdPASS)
        {
            /* 定时器队列满等异常时仍落盘，避免已清 dirty 却永不写入 NVS */
            save_brightness_to_nvs(g_brightness_commit_pending);
        }
    }
    else
    {
        /* xTimerCreate 失败（如堆不足）时直接写 NVS，否则与蓝牙路径行为不一致 */
        save_brightness_to_nvs(g_brightness_commit_pending);
    }
}

// 获取当前亮度百分比 (供 UI 初始化滑块与 BLE 查询，0~100)
int get_system_brightness_percent(void)
{
    unsigned d = g_current_brightness;
    if (d <= BRIGHTNESS_PWM_MIN)
        return 0;
    if (d >= BRIGHTNESS_PWM_MAX)
        return 100;
    return (int)((d - BRIGHTNESS_PWM_MIN) * 100U / BRIGHTNESS_PWM_SPAN);
}

// 【核心函数 2】设置是否阻止休眠 (例如 OTA 时调用 set_block_sleep(true))
void set_block_auto_sleep(bool block)
{
    block_auto_sleep = block;
    if (block)
    {
        system_keep_alive(); // 阻止时顺便刷新一下时间
    }
}


/* 亮度滑动条同步：将设置页滑动条与当前系统亮度对齐 */
void request_brightness_slider_sync(void)
{
    extern lv_ui guider_ui;
    extern int get_system_brightness_percent(void);
    
    int percent = get_system_brightness_percent();
    
    if (guider_ui.screen_set_slider_light != NULL && 
        lv_obj_is_valid(guider_ui.screen_set_slider_light)) {
        lv_slider_set_value(guider_ui.screen_set_slider_light, percent, LV_ANIM_OFF);
    }
}