#include "bsp_board.h"

#include <stdbool.h>
#include "esp_err.h"
#include "freertos/FreeRTOS.h"
#include "freertos/semphr.h"
#include "freertos/task.h"
#include "string.h"
#include "driver/gpio.h"
#include "esp_err.h"
#include "esp_log.h"
#include "esp_rom_sys.h"
#include "esp_check.h"
#include "esp_vfs_fat.h"
#include "sdmmc_cmd.h"
#include "driver/i2s_std.h"
#include "driver/i2s_types.h"
#include "driver/i2s_pdm.h"
#include "driver/i2s_tdm.h"

#include <sys/unistd.h>
#include <sys/stat.h>
#include "dirent.h"
#include "driver/sdmmc_host.h"
#include <errno.h>

#if ((SOC_SDMMC_HOST_SUPPORTED) && (FUNC_SDMMC_EN))
#include "driver/sdmmc_host.h"
#endif /* ((SOC_SDMMC_HOST_SUPPORTED) && (FUNC_SDMMC_EN)) */


#define ADC_I2S_CHANNEL 2
#define ADC_BITS_PER_SAMPLE 32

static sdmmc_card_t *card;
static const char *TAG = "board";
static int s_play_sample_rate = 16000;
static int s_play_channel_format = 1;
static int s_bits_per_chan = 16;

#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
static i2s_chan_handle_t            tx_handle = NULL;        // I2S tx channel handler
static i2s_chan_handle_t            rx_handle = NULL;        // I2S rx channel handler
#endif
static audio_codec_data_if_t *record_data_if  = NULL;
static audio_codec_ctrl_if_t *record_ctrl_if  = NULL;
static audio_codec_if_t *record_codec_if      = NULL;
static esp_codec_dev_handle_t record_dev      = NULL;

static audio_codec_data_if_t *play_data_if    = NULL;
static audio_codec_ctrl_if_t *play_ctrl_if    = NULL;
static audio_codec_gpio_if_t *play_gpio_if    = NULL;
static audio_codec_if_t *play_codec_if        = NULL;
static esp_codec_dev_handle_t play_dev        = NULL;
static i2c_master_bus_handle_t i2c_bus_handle = NULL;
static uint32_t SDCard_Size  = 0;
static bool s_volume_buttons_task_started = false;

int mic_level = 0;
esp_codec_dev_handle_t esp_ret_play_dev(void)
{
    return play_dev;
}

i2c_master_bus_handle_t esp_ret_i2c_handle(void)
{
    return i2c_bus_handle;
}

static esp_err_t i2c_master_init(void)
{
    const i2c_master_bus_config_t bus_config = {
        .i2c_port = I2C_NUM,
        .sda_io_num = GPIO_I2C_SDA,
        .scl_io_num = GPIO_I2C_SCL,
        .clk_source = I2C_CLK_SRC_DEFAULT,
    };

    esp_err_t ret = i2c_new_master_bus(&bus_config, &i2c_bus_handle);
    if (ret != ESP_OK) {
        ESP_LOGE(TAG, "Failed to initialize I2C bus: %s", esp_err_to_name(ret));
        return ret;
    }

    ESP_LOGI(TAG, "I2C bus initialized successfully");
    return ESP_OK;  // 返回 ESP_OK 表示成功
}


esp_err_t bsp_codec_adc_init(int sample_rate)
{    ESP_LOGI(TAG,"ADC INIT START");
    esp_err_t ret_val = ESP_OK;

    audio_codec_i2s_cfg_t i2s_cfg = {
        .port = I2S_NUM_1,
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
        .rx_handle = rx_handle,
        .tx_handle = NULL,
#endif
    };

    record_data_if = audio_codec_new_i2s_data(&i2s_cfg);

    if(record_data_if == NULL)
{
    ESP_LOGE(TAG,"record_data_if creation failed");
    return ESP_FAIL;
}


    audio_codec_i2c_cfg_t i2c_cfg = {
        .addr = ES7210_CODEC_DEFAULT_ADDR,
        .bus_handle = i2c_bus_handle
    };


    record_ctrl_if = audio_codec_new_i2c_ctrl(&i2c_cfg);


    es7210_codec_cfg_t es7210_cfg = {
        .ctrl_if = record_ctrl_if,
        .mic_selected =
            ES7210_SEL_MIC1 |
            ES7210_SEL_MIC2 |
            ES7210_SEL_MIC3 |
            ES7210_SEL_MIC4,
    };


    record_codec_if = es7210_codec_new(&es7210_cfg);

    ESP_LOGI(TAG,"ES7210 IF=%p", record_codec_if);


    esp_codec_dev_cfg_t dev_cfg = {
        .codec_if = record_codec_if,
        .data_if = record_data_if,
        .dev_type = ESP_CODEC_DEV_TYPE_IN,
    };


    record_dev = esp_codec_dev_new(&dev_cfg);


    if(record_dev == NULL)
    {
        ESP_LOGE(TAG,"Failed creating ADC codec");
        return ESP_FAIL;
    }


    esp_codec_dev_sample_info_t fs = {
        .sample_rate = sample_rate,
        .channel = 2,
        .bits_per_sample = 16,
    };


    ret_val = esp_codec_dev_open(record_dev, &fs);


    if(ret_val != ESP_OK)
    {
        ESP_LOGE(TAG,
                 "Codec open failed %s",
                 esp_err_to_name(ret_val));
        return ret_val;
    }


    esp_codec_dev_set_in_channel_gain(
        record_dev,
        ESP_CODEC_DEV_MAKE_CHANNEL_MASK(0),
        RECORD_VOLUME);

    esp_codec_dev_set_in_channel_gain(
        record_dev,
        ESP_CODEC_DEV_MAKE_CHANNEL_MASK(1),
        RECORD_VOLUME);


    return ret_val;
}

esp_err_t bsp_codec_dac_init(int sample_rate, int channel_format, int bits_per_chan)
{
    esp_err_t ret_val = ESP_OK;

    // Do initialize of related interface: data_if, ctrl_if and gpio_if
    audio_codec_i2s_cfg_t i2s_cfg = {
        .port = I2S_NUM_1,
#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
        .rx_handle = NULL,
        .tx_handle = tx_handle,
#endif
    };
    play_data_if = audio_codec_new_i2s_data(&i2s_cfg);

    audio_codec_i2c_cfg_t i2c_cfg = {.addr = ES8311_CODEC_DEFAULT_ADDR,.bus_handle = i2c_bus_handle};
    play_ctrl_if = audio_codec_new_i2c_ctrl(&i2c_cfg);
    play_gpio_if = audio_codec_new_gpio();
    // New output codec interface
    es8311_codec_cfg_t es8311_cfg = {
        .codec_mode = ESP_CODEC_DEV_WORK_MODE_DAC,
        .ctrl_if = play_ctrl_if,
        .gpio_if = play_gpio_if,
        .pa_pin = GPIO_PWR_CTRL,
        .use_mclk = false,
    };
    play_codec_if = es8311_codec_new(&es8311_cfg);
    // New output codec device
    esp_codec_dev_cfg_t dev_cfg = {
        .codec_if = play_codec_if,
        .data_if = play_data_if,
        .dev_type = ESP_CODEC_DEV_TYPE_OUT,
    };
    play_dev = esp_codec_dev_new(&dev_cfg);

    esp_codec_dev_sample_info_t fs = {
        .bits_per_sample = bits_per_chan,
        .sample_rate = sample_rate,
        .channel = channel_format,
    };
    esp_codec_dev_set_out_vol(play_dev, PLAYER_VOLUME);
    esp_codec_dev_open(play_dev, &fs);

    return ret_val;
}

static esp_err_t bsp_codec_adc_deinit()
{
    esp_err_t ret_val = ESP_OK;

    if (record_dev) {
        esp_codec_dev_close(record_dev);
        esp_codec_dev_delete(record_dev);
        record_dev = NULL;
    }

    // Delete codec interface
    if (record_codec_if) {
        audio_codec_delete_codec_if(record_codec_if);
        record_codec_if = NULL;
    }
    
    // Delete codec control interface
    if (record_ctrl_if) {
        audio_codec_delete_ctrl_if(record_ctrl_if);
        record_ctrl_if = NULL;
    }
    
    // Delete codec data interface
    if (record_data_if) {
        audio_codec_delete_data_if(record_data_if);
        record_data_if = NULL;
    }

    return ret_val;
}

static esp_err_t bsp_codec_dac_deinit()
{
    esp_err_t ret_val = ESP_OK;

    if (play_dev) {
        esp_codec_dev_close(play_dev);
        esp_codec_dev_delete(play_dev);
        play_dev = NULL;
    }

    // Delete codec interface
    if (play_codec_if) {
        audio_codec_delete_codec_if(play_codec_if);
        play_codec_if = NULL;
    }
    
    // Delete codec control interface
    if (play_ctrl_if) {
        audio_codec_delete_ctrl_if(play_ctrl_if);
        play_ctrl_if = NULL;
    }
    
    if (play_gpio_if) {
        audio_codec_delete_gpio_if(play_gpio_if);
        play_gpio_if = NULL;
    }
    
    // Delete codec data interface
    if (play_data_if) {
        audio_codec_delete_data_if(play_data_if);
        play_data_if = NULL;
    }

    return ret_val;
}

esp_err_t esp_audio_set_play_vol(int volume)
{
    if (!play_dev) {
        ESP_LOGE(TAG, "DAC codec init fail");
        return ESP_FAIL;
    }
    esp_codec_dev_set_out_vol(play_dev, volume);
    return ESP_OK;
}

esp_err_t esp_audio_get_play_vol(int *volume)
{
    if (!play_dev) {
        ESP_LOGE(TAG, "DAC codec init fail");
        return ESP_FAIL;
    }
    esp_codec_dev_get_out_vol(play_dev, volume);
    return ESP_OK;
}

// static esp_err_t bsp_i2s_init(i2s_port_t i2s_num, uint32_t sample_rate, i2s_channel_fmt_t channel_format, i2s_bits_per_chan_t bits_per_chan)
static esp_err_t bsp_i2s_init(int i2s_num, uint32_t sample_rate, int channel_format, int bits_per_chan)
{
    esp_err_t ret_val = ESP_OK;

#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
    i2s_slot_mode_t channel_fmt = I2S_SLOT_MODE_STEREO;
    if (channel_format == 1) {
        channel_fmt = I2S_SLOT_MODE_MONO;
    } else if (channel_format == 2) {
        channel_fmt = I2S_SLOT_MODE_STEREO;
    } else {
        ESP_LOGE(TAG, "Unable to configure channel_format %d", channel_format);
        channel_format = 1;
        channel_fmt = I2S_SLOT_MODE_MONO;
    }

    if (bits_per_chan != 16 && bits_per_chan != 32) {
        ESP_LOGE(TAG, "Unable to configure bits_per_chan %d", bits_per_chan);
        bits_per_chan = 32;
    }

    i2s_chan_config_t chan_cfg = I2S_CHANNEL_DEFAULT_CONFIG(i2s_num, I2S_ROLE_MASTER);
    ret_val |= i2s_new_channel(&chan_cfg, &tx_handle, &rx_handle);
    i2s_std_config_t std_cfg = I2S_CONFIG_DEFAULT(sample_rate, channel_fmt, bits_per_chan);
    ret_val |= i2s_channel_init_std_mode(tx_handle, &std_cfg);
    ret_val |= i2s_channel_init_std_mode(rx_handle, &std_cfg);
    ret_val |= i2s_channel_enable(tx_handle);
    ret_val |= i2s_channel_enable(rx_handle);
#else
    i2s_channel_fmt_t channel_fmt = I2S_CHANNEL_FMT_RIGHT_LEFT;
    if (channel_format == 1) {
        channel_fmt = I2S_CHANNEL_FMT_ONLY_LEFT;
    } else if (channel_format == 2) {
        channel_fmt = I2S_CHANNEL_FMT_RIGHT_LEFT;
    } else {
        ESP_LOGE(TAG, "Unable to configure channel_format %d", channel_format);
        channel_format = 1;
        channel_fmt = I2S_CHANNEL_FMT_ONLY_LEFT;
    }

    if (bits_per_chan != 16 && bits_per_chan != 32) {
        ESP_LOGE(TAG, "Unable to configure bits_per_chan %d", bits_per_chan);
        bits_per_chan = 16;
    }

    i2s_config_t i2s_config = I2S_CONFIG_DEFAULT(sample_rate, channel_fmt, bits_per_chan);

    i2s_pin_config_t pin_config = {
        .bck_io_num = GPIO_I2S_SCLK,
        .ws_io_num = GPIO_I2S_LRCK,
        .data_out_num = GPIO_I2S_DOUT,
        .data_in_num = GPIO_I2S_SDIN,
        .mck_io_num = GPIO_I2S_MCLK,
    };

    ret_val |= i2s_driver_install(i2s_num, &i2s_config, 0, NULL);
    ret_val |= i2s_set_pin(i2s_num, &pin_config);
#endif

    return ret_val;
}

static esp_err_t bsp_i2s_deinit(int i2s_num)
{
    esp_err_t ret_val = ESP_OK;

#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
    if (i2s_num == I2S_NUM_1 && rx_handle) {
        ret_val |= i2s_channel_disable(rx_handle);
        ret_val |= i2s_del_channel(rx_handle);
        rx_handle = NULL;
    } else if (i2s_num == I2S_NUM_0  && tx_handle) {
        ret_val |= i2s_channel_disable(tx_handle);
        ret_val |= i2s_del_channel(tx_handle);
        tx_handle = NULL;
    }
#else
    ret_val |= i2s_stop(i2s_num);
    ret_val |= i2s_driver_uninstall(i2s_num);
#endif

    return ret_val;
}

static esp_err_t bsp_codec_init(
        int adc_sample_rate,
        int dac_sample_rate,
        int dac_channel_format,
        int dac_bits_per_chan)
{
    //ESP_LOGE(TAG, "bsp_codec_adc_init START");
    esp_err_t ret;

    ret = bsp_codec_adc_init(adc_sample_rate);

    if(ret != ESP_OK)
    {
        ESP_LOGE(TAG,"ADC init failed: %s",
                 esp_err_to_name(ret));
        return ret;
    }


    ret = bsp_codec_dac_init(
            dac_sample_rate,
            dac_channel_format,
            dac_bits_per_chan);


    if(ret != ESP_OK)
    {
        ESP_LOGE(TAG,"DAC init failed: %s",
                 esp_err_to_name(ret));
    }


    return ret;
}

static esp_err_t bsp_codec_deinit()
{
    esp_err_t ret_val = ESP_OK;

    ret_val |= bsp_codec_adc_deinit();
    ret_val |= bsp_codec_dac_deinit();
    return ret_val;
}

esp_err_t esp_audio_play(const int16_t* data, int length, uint32_t ticks_to_wait)
{
    size_t bytes_write = 0;
    esp_err_t ret = ESP_OK;
    if (!play_dev) {
        return ESP_FAIL;
    }

    int out_length= length;
    int audio_time = 1;
    audio_time *= (16000 / s_play_sample_rate);
    audio_time *= (2 / s_play_channel_format);

    int *data_out = NULL;
    if (s_bits_per_chan != 32) {
        out_length = length * 2;
        data_out = malloc(out_length);
        for (int i = 0; i < length / sizeof(int16_t); i++) {
            int ret = data[i];
            data_out[i] = ret << 16;
        }
    }

    int *data_out_1 = NULL;
    if (s_play_channel_format != 2 || s_play_sample_rate != 16000) {
        out_length *= audio_time;
        data_out_1 = malloc(out_length);
        int *tmp_data = NULL;
        if (data_out != NULL) {
            tmp_data = data_out;
        } else {
            tmp_data = (int *)data;
        }

        for (int i = 0; i < out_length / (audio_time * sizeof(int)); i++) {
            for (int j = 0; j < audio_time; j++) {
                data_out_1[audio_time * i + j] = tmp_data[i];
            }
        }
        if (data_out != NULL) {
            free(data_out);
            data_out = NULL;
        }
    }

    if (data_out != NULL) {
        ret = esp_codec_dev_write(play_dev, (void *)data_out, out_length);
        free(data_out);
    } else if (data_out_1 != NULL) {
        ret = esp_codec_dev_write(play_dev, (void *)data_out_1, out_length);
        free(data_out_1);
    } else {
        ret = esp_codec_dev_write(play_dev, (void *)data, length);
    }

    return ret;
}
int get_mic_level (void) {

    return mic_level;
}
esp_err_t esp_get_feed_data(
        bool is_get_raw_channel,
        int16_t *buffer,
        int buffer_len)
{

    ESP_LOGE(TAG, "NEW esp_get_feed_data CALLED");

    if(record_dev == NULL)
    {
        ESP_LOGE(TAG,"record_dev NULL");
        return ESP_ERR_INVALID_STATE;
    }


    ESP_LOGI(TAG,
             "read buffer=%p size=%d",
             buffer,
             buffer_len);


    esp_err_t ret;

    ret = esp_codec_dev_read(
            record_dev,
            buffer,
            buffer_len);


    ESP_LOGI(TAG,
             "codec read ret=%s",
             esp_err_to_name(ret));


    if(ret != ESP_OK)
    {
        return ret;
    }


    // Check microphone data
    int64_t sum = 0;

    for(int i=0;i<buffer_len/sizeof(int16_t);i++)
    {
        sum += abs(buffer[i]);
    }


    ESP_LOGI(TAG,
             "MIC level=%lld",
             sum/(buffer_len/sizeof(int16_t)));


    return ESP_OK;
}


int esp_get_feed_channel(void)
{
    return ADC_I2S_CHANNEL;
}

char* esp_get_input_format(void)
{
    return "RM";
}

static void bsp_volume_buttons_task(void *arg)
{
    int last_key1 = 1;
    int last_key3 = 1;

    while (1) {
        int key1 = gpio_get_level(GPIO_KEY1_PIN);
        int key3 = gpio_get_level(GPIO_KEY3_PIN);

        if (key1 == 0 && last_key1 != 0) {
            int current_vol = 0;
            if (esp_audio_get_play_vol(&current_vol) == ESP_OK) {
                current_vol += VOLUME_STEP;
                if (current_vol > VOLUME_MAX_LEVEL) {
                    current_vol = VOLUME_MAX_LEVEL;
                }
                if (esp_audio_set_play_vol(current_vol) == ESP_OK) {
                    ESP_LOGI(TAG, "Volume up -> %d", current_vol);
                }
            }
        }

        if (key3 == 0 && last_key3 != 0) {
            int current_vol = 0;
            if (esp_audio_get_play_vol(&current_vol) == ESP_OK) {
                current_vol -= VOLUME_STEP;
                if (current_vol < VOLUME_MIN_LEVEL) {
                    current_vol = VOLUME_MIN_LEVEL;
                }
                if (esp_audio_set_play_vol(current_vol) == ESP_OK) {
                    ESP_LOGI(TAG, "Volume down -> %d", current_vol);
                }
            }
        }

        last_key1 = key1;
        last_key3 = key3;
        vTaskDelay(pdMS_TO_TICKS(VOLUME_BUTTON_POLL_MS));
    }
}

static esp_err_t bsp_volume_buttons_init(void)
{
    if (s_volume_buttons_task_started) {
        return ESP_OK;
    }

    gpio_config_t io_conf = {
        .pin_bit_mask = (1ULL << GPIO_KEY1_PIN) | (1ULL << GPIO_KEY3_PIN),
        .mode = GPIO_MODE_INPUT,
        .pull_up_en = GPIO_PULLUP_ENABLE,
        .pull_down_en = GPIO_PULLDOWN_DISABLE,
        .intr_type = GPIO_INTR_DISABLE,
    };

    esp_err_t ret = gpio_config(&io_conf);
    if (ret != ESP_OK) {
        return ret;
    }

    BaseType_t task_created = xTaskCreate(bsp_volume_buttons_task, "vol_btns", 4096, NULL, 5, NULL);
    if (task_created != pdPASS) {
        return ESP_FAIL;
    }

    s_volume_buttons_task_started = true;
    return ESP_OK;
}

esp_err_t esp_board_init(uint32_t sample_rate, int channel_format, int bits_per_chan)
{
    /*!< Initialize I2C bus, used for audio codec*/

    i2c_master_init();
    s_play_sample_rate = sample_rate;

    if (channel_format != 2 && channel_format != 1) {
        ESP_LOGE(TAG, "Unable to configure channel_format");
        channel_format = 2;
    }
    s_play_channel_format = channel_format;

    if (bits_per_chan != 32 && bits_per_chan != 16) {
        ESP_LOGE(TAG, "Unable to configure bits_per_chan");
        bits_per_chan = 32;
    }
    s_bits_per_chan = bits_per_chan;

    bsp_i2s_init(I2S_NUM_1, 16000, 2, 16);
    // Because record and play use the same i2s.
esp_err_t codec_ret;

codec_ret = bsp_codec_init(16000,16000,2,16);

if(codec_ret != ESP_OK)
{
    ESP_LOGE(TAG,
             "bsp_codec_init failed: %s",
             esp_err_to_name(codec_ret));
}
else
{
    ESP_LOGI(TAG,"bsp_codec_init OK");
}
    /* Initialize PA */
     /*gpio_config_t  io_conf;
     memset(&io_conf, 0, sizeof(io_conf));
     io_conf.intr_type = GPIO_INTR_DISABLE;
     io_conf.mode = GPIO_MODE_OUTPUT;
     io_conf.pin_bit_mask = ((1ULL << GPIO_PWR_CTRL));
     io_conf.pull_down_en = 0;
     io_conf.pull_up_en = 0;
     gpio_config(&io_conf);
     */
    gpio_set_level(GPIO_PWR_CTRL, 1);

    esp_err_t button_ret = bsp_volume_buttons_init();
    if (button_ret != ESP_OK) {
        ESP_LOGW(TAG, "Failed to initialize volume buttons: %s", esp_err_to_name(button_ret));
    }

    return ESP_OK;
}

esp_err_t esp_sdcard_init(char *mount_point, size_t max_files)
{
    if (NULL != card) {
        return ESP_ERR_INVALID_STATE;
    }

    /* Check if SD crad is supported */
    if (!FUNC_SDMMC_EN && !FUNC_SDSPI_EN) {
        ESP_LOGE(TAG, "SDMMC and SDSPI not supported on this board!");
        return ESP_ERR_NOT_SUPPORTED;
    }

    esp_err_t ret_val = ESP_OK;

    /**
     * @brief Options for mounting the filesystem.
     *   If format_if_mount_failed is set to true, SD card will be partitioned and
     *   formatted in case when mounting fails.
     *
     */
    esp_vfs_fat_sdmmc_mount_config_t mount_config = {
        .format_if_mount_failed = false,
        .max_files = max_files,
        .allocation_unit_size = 16 * 1024
    };

    /**
     * @brief Use settings defined above to initialize SD card and mount FAT filesystem.
     *   Note: esp_vfs_fat_sdmmc/sdspi_mount is all-in-one convenience functions.
     *   Please check its source code and implement error recovery when developing
     *   production applications.
     *
     */
    sdmmc_host_t host =
#if FUNC_SDMMC_EN
        SDMMC_HOST_DEFAULT();
#else
        SDSPI_HOST_DEFAULT();
    spi_bus_config_t bus_cfg = {
        .mosi_io_num = GPIO_SDSPI_MOSI,
        .miso_io_num = GPIO_SDSPI_MISO,
        .sclk_io_num = GPIO_SDSPI_SCLK,
        .quadwp_io_num = GPIO_NUM_NC,
        .quadhd_io_num = GPIO_NUM_NC,
        .max_transfer_sz = 4000,
    };
    ret_val = spi_bus_initialize(host.slot, &bus_cfg, SPI_DMA_CH_AUTO);
    if (ret_val != ESP_OK) {
        ESP_LOGE(TAG, "Failed to initialize bus.");
        return ret_val;
    }
#endif

    /**
     * @brief This initializes the slot without card detect (CD) and write protect (WP) signals.
     *   Modify slot_config.gpio_cd and slot_config.gpio_wp if your board has these signals.
     *
     */
#if FUNC_SDMMC_EN
    sdmmc_slot_config_t slot_config = SDMMC_SLOT_CONFIG_DEFAULT();
#else
    sdspi_device_config_t slot_config = SDSPI_DEVICE_CONFIG_DEFAULT();
#endif

#if FUNC_SDMMC_EN
    /* Config SD data width. 0, 4 or 8. Currently for SD card, 8 bit is not supported. */
    slot_config.width = SDMMC_BUS_WIDTH;

    /**
     * @brief On chips where the GPIOs used for SD card can be configured, set them in
     *   the slot_config structure.
     *
     */
#if SOC_SDMMC_USE_GPIO_MATRIX
    slot_config.clk = GPIO_SDMMC_CLK;
    slot_config.cmd = GPIO_SDMMC_CMD;
    slot_config.d0 = GPIO_SDMMC_D0;
    slot_config.d1 = GPIO_SDMMC_D1;
    slot_config.d2 = GPIO_SDMMC_D2;
    slot_config.d3 = GPIO_SDMMC_D3;
#endif
    slot_config.cd = GPIO_SDMMC_DET;
    slot_config.flags |= SDMMC_SLOT_FLAG_INTERNAL_PULLUP;
#else
    slot_config.gpio_cs = GPIO_SDSPI_CS;
    slot_config.host_id = host.slot;
#endif
    /**
     * @brief Enable internal pullups on enabled pins. The internal pullups
     *   are insufficient however, please make sure 10k external pullups are
     *   connected on the bus. This is for debug / example purpose only.
     */

    /* get FAT filesystem on SD card registered in VFS. */
    ret_val =
#if FUNC_SDMMC_EN
        esp_vfs_fat_sdmmc_mount(mount_point, &host, &slot_config, &mount_config, &card);
#else
        esp_vfs_fat_sdspi_mount(mount_point, &host, &slot_config, &mount_config, &card);
#endif

    /* Check for SDMMC mount result. */
    if (ret_val != ESP_OK) {
        if (ret_val == ESP_FAIL) {
            ESP_LOGE(TAG, "Failed to mount filesystem. "
                     "If you want the card to be formatted, set the EXAMPLE_FORMAT_IF_MOUNT_FAILED menuconfig option.");
        } else {
            ESP_LOGE(TAG, "Failed to initialize the card (%s). "
                     "Make sure SD card lines have pull-up resistors in place.", esp_err_to_name(ret_val));
        }
        return ret_val;
    }

    /* Card has been initialized, print its properties. */
    sdmmc_card_print_info(stdout, card);
    SDCard_Size = ((uint64_t) card->csd.capacity) * card->csd.sector_size / (1024 * 1024);
    return ret_val;
}

esp_err_t esp_sdcard_deinit(char *mount_point)
{
    if (NULL == mount_point) {
        return ESP_ERR_INVALID_STATE;
    }

    /* Unmount an SD card from the FAT filesystem and release resources acquired */
    esp_err_t ret_val = esp_vfs_fat_sdcard_unmount(mount_point, card);

    /* Make SD/MMC card information structure pointer NULL */
    card = NULL;

    return ret_val;
}

#define MOUNT_POINT "/sdcard"

static const char *SD_TAG = "SD";



uint16_t Folder_retrieval(const char* directory, const char* fileExtension, char File_Name[][MAX_FILE_NAME_SIZE], uint16_t maxFiles)    
{
    DIR *dir = opendir(directory);  
    if (dir == NULL) {
        ESP_LOGE(SD_TAG, "Path: <%s> does not exist", directory); 
        return 0;  
    }

    uint16_t fileCount = 0;  
    struct dirent *entry;   

    while ((entry = readdir(dir)) != NULL && fileCount < maxFiles) {

        if (strcmp(entry->d_name, ".") == 0 || strcmp(entry->d_name, "..") == 0) {
            continue;
        }

        const char *dot = strrchr(entry->d_name, '.');  
        if (dot != NULL && dot != entry->d_name) { 

            if (strcasecmp(dot, fileExtension) == 0) {  
                strncpy(File_Name[fileCount], entry->d_name, MAX_FILE_NAME_SIZE - 1);
                File_Name[fileCount][MAX_FILE_NAME_SIZE - 1] = '\0';  

                char filePath[MAX_PATH_SIZE];
                snprintf(filePath, MAX_PATH_SIZE, "%s/%s", directory, entry->d_name);

                printf("File found: %s\r\n", filePath); 
                fileCount++;  
            }
        }
        else{
           
            // printf("No extension found for file: %s\r\n", entry->d_name);
        }
    }

    closedir(dir);  

    if (fileCount > 0) {
        ESP_LOGI(SD_TAG, "Retrieved %d files with extension '%s'", fileCount, fileExtension);  
    } else {
        ESP_LOGW(SD_TAG, "No files with extension '%s' found in directory: %s", fileExtension, directory); 
    }

    return fileCount; 
}