/**
 * @file lv_port_fs_template.c
 *
 */

/*Copy this file as "lv_port_fs.c" and set this value to "1" to enable content*/
#if 1

/*********************
 *      INCLUDES
 *********************/
#include "lv_port_fs.h"
#include "lvgl.h"

static const char *TAG = "LVGL_FS";
/*********************
 *      DEFINES
 *********************/

/**********************
 *      TYPEDEFS
 **********************/

/**********************
 *  STATIC PROTOTYPES
 **********************/
static void fs_init(void);

static void *fs_open(lv_fs_drv_t *drv, const char *path, lv_fs_mode_t mode);
static lv_fs_res_t fs_close(lv_fs_drv_t *drv, void *file_p);
static lv_fs_res_t fs_read(lv_fs_drv_t *drv, void *file_p, void *buf, uint32_t btr, uint32_t *br);
static lv_fs_res_t fs_write(lv_fs_drv_t *drv, void *file_p, const void *buf, uint32_t btw, uint32_t *bw);
static lv_fs_res_t fs_seek(lv_fs_drv_t *drv, void *file_p, uint32_t pos, lv_fs_whence_t whence);
static lv_fs_res_t fs_size(lv_fs_drv_t *drv, void *file_p, uint32_t *size_p);
static lv_fs_res_t fs_tell(lv_fs_drv_t *drv, void *file_p, uint32_t *pos_p);

static void *fs_dir_open(lv_fs_drv_t *drv, const char *path);
static lv_fs_res_t fs_dir_read(lv_fs_drv_t *drv, void *rddir_p, char *fn, uint32_t fn_len);
static lv_fs_res_t fs_dir_close(lv_fs_drv_t *drv, void *rddir_p);

/**********************
 *  STATIC VARIABLES
 **********************/

/**********************
 * GLOBAL PROTOTYPES
 **********************/

/**********************
 *      MACROS
 **********************/

/**********************
 *   GLOBAL FUNCTIONS
 **********************/

void lv_port_fs_init(void)
{
    /*----------------------------------------------------
     * Initialize your storage device and File System
     * -------------------------------------------------*/
    fs_init();

    /*---------------------------------------------------
     * Register the file system interface in LVGL
     *--------------------------------------------------*/

    static lv_fs_drv_t fs_drv;
    lv_fs_drv_init(&fs_drv);

    /*Set up fields...*/
    fs_drv.letter = 'S';
    fs_drv.open_cb = fs_open;
    fs_drv.close_cb = fs_close;
    fs_drv.read_cb = fs_read;
    fs_drv.write_cb = fs_write;
    fs_drv.seek_cb = fs_seek;
    fs_drv.tell_cb = fs_tell;

    fs_drv.dir_close_cb = fs_dir_close;
    fs_drv.dir_open_cb = fs_dir_open;
    fs_drv.dir_read_cb = fs_dir_read;

    lv_fs_drv_register(&fs_drv);
}

/**********************
 *   STATIC FUNCTIONS
 **********************/

/*Initialize your Storage device and File system.*/
static void fs_init(void)
{
    /*E.g. for FatFS initialize the SD card and FatFS itself*/

    /*You code here*/
    ESP_LOGI(TAG, "fs_init");
}

/**
 * Open a file
 * @param drv       pointer to a driver where this function belongs
 * @param path      path to the file beginning with the driver letter (e.g. S:/folder/file.txt)
 * @param mode      read: FS_MODE_RD, write: FS_MODE_WR, both: FS_MODE_RD | FS_MODE_WR
 * @return          a file descriptor or NULL on error
 */
static void *fs_open(lv_fs_drv_t *drv, const char *path, lv_fs_mode_t mode)
{

    ESP_LOGI(TAG, "fs_open:%s", path);

    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    void *f = NULL;

    if (mode == LV_FS_MODE_WR)
    {
        /*Open a file for write*/
        // f = ...         /*Add your code here*/
        f = fopen(path, "wb");
    }
    else if (mode == LV_FS_MODE_RD)
    {
        /*Open a file for read*/
        // f = ...         /*Add your code here*/
        f = fopen(path, "rb");
    }
    else if (mode == (LV_FS_MODE_WR | LV_FS_MODE_RD))
    {
        /*Open a file for read and write*/
        // f = ...         /*Add your code here*/
        f = fopen(path, "wb+");
    }

    if (f == NULL)
    {
        res = LV_FS_RES_NOT_EX;
        ESP_LOGW(TAG, "找不到文件:%s", path);
    }
    else
    {
        res = LV_FS_RES_OK;
    }

    return f;
}

/**
 * Close an opened file
 * @param drv       pointer to a driver where this function belongs
 * @param file_p    pointer to a file_t variable. (opened with fs_open)
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_close(lv_fs_drv_t *drv, void *file_p)
{
    ESP_LOGI(TAG, "fs_close");

    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    int r = fclose(file_p);

    if (r != 0)
    {
        res = LV_FS_RES_UNKNOWN;
        ESP_LOGE(TAG, "文件关闭失败");
    }
    else
    {
        res = LV_FS_RES_OK;
    }

    /*Add your code here*/

    return res;
}

/**
 * Read data from an opened file
 * @param drv       pointer to a driver where this function belongs
 * @param file_p    pointer to a file_t variable.
 * @param buf       pointer to a memory block where to store the read data
 * @param btr       number of Bytes To Read
 * @param br        the real number of read bytes (Byte Read)
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_read(lv_fs_drv_t *drv, void *file_p, void *buf, uint32_t btr, uint32_t *br)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    /*Add your code here*/
    ESP_LOGI(TAG, "fs_read");

    FILE *f = (FILE *)file_p;
    size_t bytes_read = fread(buf, 1, btr, f);
    *br = (uint32_t)bytes_read;

    if (*br == btr)
    {
        res = LV_FS_RES_OK;
    }
    else
    {

        ESP_LOGE(TAG, "文件读取字节数量错误需要读取%lu 已读取%lu", btr, *br);
        res = LV_FS_RES_UNKNOWN;
    }

    ESP_LOGI(TAG, "文件读取字节数量:读取%lu 已读取%lu", btr, *br);

    return res;
}

/**
 * Write into a file
 * @param drv       pointer to a driver where this function belongs
 * @param file_p    pointer to a file_t variable
 * @param buf       pointer to a buffer with the bytes to write
 * @param btw       Bytes To Write
 * @param bw        the number of real written bytes (Bytes Written). NULL if unused.
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_write(lv_fs_drv_t *drv, void *file_p, const void *buf, uint32_t btw, uint32_t *bw)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    /*Add your code here*/
    ESP_LOGI(TAG, "fs_write");

    FILE *f = (FILE *)file_p;
    size_t bytes_written = fwrite(buf, 1, btw, f);
    *bw = (uint32_t)bytes_written;

    if (*bw == btw)
    {
        res = LV_FS_RES_OK;
    }
    else
    {

        ESP_LOGE(TAG, "文件写入字节数量错误需要写入%lu 已写入%lu", btw, *bw);
        res = LV_FS_RES_UNKNOWN;
    }

    return res;
}

/**
 * Set the read write pointer. Also expand the file size if necessary.
 * @param drv       pointer to a driver where this function belongs
 * @param file_p    pointer to a file_t variable. (opened with fs_open )
 * @param pos       the new position of read write pointer
 * @param whence    tells from where to interpret the `pos`. See @lv_fs_whence_t
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_seek(lv_fs_drv_t *drv, void *file_p, uint32_t pos, lv_fs_whence_t whence)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    /*Add your code here*/
    ESP_LOGI(TAG, "fs_seek:pop%lu whence%d",pos,whence);

    FILE *f = (FILE *)file_p;
    int std_whence;
    switch (whence)
    {
    case LV_FS_SEEK_SET:
        std_whence = SEEK_SET;
        break;
    case LV_FS_SEEK_CUR:
        std_whence = SEEK_CUR;
        break;
    case LV_FS_SEEK_END:
        std_whence = SEEK_END;
        break;
    default:
        // 如果传入的 whence 值不合法
        ESP_LOGE(TAG, "whence 参数错误");
        return LV_FS_RES_INV_PARAM;
    }

    if (fseek(f, (long)pos, std_whence) != 0)
    {
        // 定位失败，返回错误
        res = LV_FS_RES_UNKNOWN; // 或更具体的错误码
        ESP_LOGE(TAG, "seek定位失败");
    }

    res = LV_FS_RES_OK;

    return res;
}
/**
 * Give the position of the read write pointer
 * @param drv       pointer to a driver where this function belongs
 * @param file_p    pointer to a file_t variable
 * @param pos_p     pointer to store the result
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_tell(lv_fs_drv_t *drv, void *file_p, uint32_t *pos_p)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    /*Add your code here*/
    ESP_LOGI(TAG, "fs_tell");

    FILE *f = (FILE *)file_p;
    long pos = ftell(f);
    if (pos < 0)
    {
        ESP_LOGE(TAG, "tell定位失败");
        return LV_FS_RES_UNKNOWN;
    }
    *pos_p = (uint32_t)pos;

    return LV_FS_RES_OK;

    return res;
}

/**
 * Initialize a 'lv_fs_dir_t' variable for directory reading
 * @param drv       pointer to a driver where this function belongs
 * @param path      path to a directory
 * @return          pointer to the directory read descriptor or NULL on error
 */
static void *fs_dir_open(lv_fs_drv_t *drv, const char *path)
{
    ESP_LOGE(TAG, "fs_dir_open:%s", path);
    void *dir = NULL;
    /*Add your code here*/
    // dir = ...           /*Add your code here*/

    return dir;
}

/**
 * Read the next filename form a directory.
 * The name of the directories will begin with '/'
 * @param drv       pointer to a driver where this function belongs
 * @param rddir_p   pointer to an initialized 'lv_fs_dir_t' variable
 * @param fn        pointer to a buffer to store the filename
 * @param fn_len    length of the buffer to store the filename
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_dir_read(lv_fs_drv_t *drv, void *rddir_p, char *fn, uint32_t fn_len)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    ESP_LOGI(TAG, "fs_dir_read");

    /*Add your code here*/

    return res;
}

/**
 * Close the directory reading
 * @param drv       pointer to a driver where this function belongs
 * @param rddir_p   pointer to an initialized 'lv_fs_dir_t' variable
 * @return          LV_FS_RES_OK: no error or  any error from @lv_fs_res_t enum
 */
static lv_fs_res_t fs_dir_close(lv_fs_drv_t *drv, void *rddir_p)
{
    lv_fs_res_t res = LV_FS_RES_NOT_IMP;

    /*Add your code here*/
    ESP_LOGI(TAG, "fs_dir_close");

    return res;
}

#else /*Enable this file at the top*/

/*This dummy typedef exists purely to silence -Wpedantic.*/
typedef int keep_pedantic_happy;
#endif