/*
 * This file is part of the MicroPython project, http://micropython.org/
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Damien P. George
 * Copyright (c) 2016 Paul Sokolovsky
 * Copyright (c) Quectel Wireless Solution, Co., Ltd.All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "py/mpconfig.h"
#if MICROPY_VFS_FAT

#if !MICROPY_VFS
#error "with MICROPY_VFS_FAT enabled, must also enable MICROPY_VFS"
#endif

#include <string.h>
#include <stdio.h>
#include "py/runtime.h"
#include "py/mperrno.h"
#include "ff.h"
#include "extmod/vfs_fat.h"
#include "lib/timeutils/timeutils.h"

#if FF_MAX_SS == FF_MIN_SS
#define SECSIZE(fs) (FF_MIN_SS)
#else
#define SECSIZE(fs) ((fs)->ssize)
#endif

#define mp_obj_fat_vfs_t fs_user_mount_t

enum { FATFS_MAKE_ARG_spiport, FATFS_MAKE_ARG_spimode, FATFS_MAKE_ARG_spiclk, FATFS_MAKE_ARG_spics };

const mp_arg_t fatfs_make_allowed_args[] = { 
 { MP_QSTR_spiport, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 32} },
 { MP_QSTR_spimode, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 32} },
 { MP_QSTR_spiclk, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 32} },
 { MP_QSTR_spics, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 32} },
};

STATIC mp_import_stat_t fat_vfs_import_stat(void *vfs_in, const char *path) {
 fs_user_mount_t *vfs = vfs_in;
 FILINFO fno;
	char fat_path[258] = "0:";
 assert(vfs != NULL);
	
	sprintf(fat_path, "%s%s", "0:", path);

	FRESULT res = f_stat(fat_path, &fno);
 if (res == FR_OK) {
 if ((fno.fattrib & AM_DIR) != 0) {
 return MP_IMPORT_STAT_DIR;
 } else {
 return MP_IMPORT_STAT_FILE;
 }
 }
 return MP_IMPORT_STAT_NO_EXIST;
}

extern unsigned char SD_Init_Config(int spi_port, int spimode, unsigned int spiclk, int spics);	

STATIC mp_obj_t fat_vfs_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {

	mp_arg_val_t args_parse[MP_ARRAY_SIZE(fatfs_make_allowed_args)];
 mp_arg_parse_all_kw_array(n_args, n_kw, args, MP_ARRAY_SIZE(fatfs_make_allowed_args), fatfs_make_allowed_args, args_parse);

 // create new object
 fs_user_mount_t *vfs = m_new_obj(fs_user_mount_t);
 vfs->base.type = type;

 // Initialise underlying block device
 vfs->blockdev.flags = MP_BLOCKDEV_FLAG_FREE_OBJ;
 vfs->blockdev.block_size = FF_MIN_SS; // default, will be populated by call to MP_BLOCKDEV_IOCTL_BLOCK_SIZE
 //mp_vfs_blockdev_init(&vfs->blockdev, args[0]);
 SD_Init_Config(args_parse[FATFS_MAKE_ARG_spiport].u_int, args_parse[FATFS_MAKE_ARG_spimode].u_int, args_parse[FATFS_MAKE_ARG_spiclk].u_int, args_parse[FATFS_MAKE_ARG_spics].u_int);//forrest.liu@20210731 add for SPI SD card function

 // mount the block device so the VFS methods can be used
 FRESULT res = f_mount(&vfs->fatfs, "0:", 1);
 if (res == FR_NO_FILESYSTEM) {
 // don't error out if no filesystem, to let mkfs()/mount() create one if wanted
 vfs->blockdev.flags |= MP_BLOCKDEV_FLAG_NO_FILESYSTEM;
 } else if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

 return MP_OBJ_FROM_PTR(vfs);
}

#if _FS_REENTRANT
STATIC mp_obj_t fat_vfs_del(mp_obj_t self_in) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(self_in);
 // f_umount only needs to be called to release the sync object
 f_umount(&self->fatfs);
 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fat_vfs_del_obj, fat_vfs_del);
#endif

STATIC mp_obj_t fat_vfs_mkfs(mp_obj_t bdev_in) {
 // create new object
 fs_user_mount_t *vfs = MP_OBJ_TO_PTR(fat_vfs_make_new(&mp_fat_vfs_type, 1, 0, &bdev_in));

 // make the filesystem
 uint8_t working_buf[FF_MAX_SS];
	MKFS_PARM opt = {
		.fmt = FM_FAT32,
 .n_fat = 2,
 .align = 4096,
 .n_root = 0, // use default
 .au_size = 0, // auto selection
 };
	//forrest.liu@20210731 modify for SPI SD card function
	FRESULT res = f_mkfs("0:", &opt, working_buf, sizeof(working_buf));
	
 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fat_vfs_mkfs_fun_obj, fat_vfs_mkfs);
STATIC MP_DEFINE_CONST_STATICMETHOD_OBJ(fat_vfs_mkfs_obj, MP_ROM_PTR(&fat_vfs_mkfs_fun_obj));

typedef struct _mp_vfs_fat_ilistdir_it_t {
 mp_obj_base_t base;
 mp_fun_1_t iternext;
 bool is_str;
 DIR dir;
} mp_vfs_fat_ilistdir_it_t;

STATIC mp_obj_t mp_vfs_fat_ilistdir_it_iternext(mp_obj_t self_in) {
 mp_vfs_fat_ilistdir_it_t *self = MP_OBJ_TO_PTR(self_in);

 for (;;) {
 FILINFO fno;
 FRESULT res = f_readdir(&self->dir, &fno);
 char *fn = fno.fname;
 if (res != FR_OK || fn[0] == 0) {
 // stop on error or end of dir
 break;
 }

 // Note that FatFS already filters . and .., so we don't need to

 // make 4-tuple with info about this entry
 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(4, NULL));
 if (self->is_str) {
 t->items[0] = mp_obj_new_str(fn, strlen(fn));
 } else {
 t->items[0] = mp_obj_new_bytes((const byte *)fn, strlen(fn));
 }
 if (fno.fattrib & AM_DIR) {
 // dir
 t->items[1] = MP_OBJ_NEW_SMALL_INT(MP_S_IFDIR);
 } else {
 // file
 t->items[1] = MP_OBJ_NEW_SMALL_INT(MP_S_IFREG);
 }
 t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // no inode number
 t->items[3] = mp_obj_new_int_from_uint(fno.fsize);

 return MP_OBJ_FROM_PTR(t);
 }

 // ignore error because we may be closing a second time
 f_closedir(&self->dir);

 return MP_OBJ_STOP_ITERATION;
}

STATIC mp_obj_t fat_vfs_ilistdir_func(size_t n_args, const mp_obj_t *args) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(args[0]);
 bool is_str_type = true;
 const char *path;
	char fat_path[258] = "0:";
	
 if (n_args == 2) {
 if (mp_obj_get_type(args[1]) == &mp_type_bytes) {
 is_str_type = false;
 }
 path = mp_obj_str_get_str(args[1]);
 } else {
 path = "";
 }
	sprintf(fat_path, "%s%s", "0:", path);

 // Create a new iterator object to list the dir
 mp_vfs_fat_ilistdir_it_t *iter = m_new_obj(mp_vfs_fat_ilistdir_it_t);
 iter->base.type = &mp_type_polymorph_iter;
 iter->iternext = mp_vfs_fat_ilistdir_it_iternext;
 iter->is_str = is_str_type;
 FRESULT res = f_opendir(&iter->dir, fat_path);
 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

 return MP_OBJ_FROM_PTR(iter);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(fat_vfs_ilistdir_obj, 1, 2, fat_vfs_ilistdir_func);

STATIC mp_obj_t fat_vfs_remove_internal(mp_obj_t vfs_in, mp_obj_t path_in, mp_int_t attr) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 const char *path = mp_obj_str_get_str(path_in);
	char fat_path[258] = "0:";
	sprintf(fat_path, "%s%s", "0:", path);

 FILINFO fno;
 FRESULT res = f_stat(fat_path, &fno);

 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

 // check if path is a file or directory
 if ((fno.fattrib & AM_DIR) == attr) {
 res = f_unlink(fat_path);

 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
 return mp_const_none;
 } else {
 mp_raise_OSError(attr ? MP_ENOTDIR : MP_EISDIR);
 }
}

STATIC mp_obj_t fat_vfs_remove(mp_obj_t vfs_in, mp_obj_t path_in) {
 return fat_vfs_remove_internal(vfs_in, path_in, 0); // 0 == file attribute
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_remove_obj, fat_vfs_remove);

STATIC mp_obj_t fat_vfs_rmdir(mp_obj_t vfs_in, mp_obj_t path_in) {
 return fat_vfs_remove_internal(vfs_in, path_in, AM_DIR);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_rmdir_obj, fat_vfs_rmdir);

STATIC mp_obj_t fat_vfs_rename(mp_obj_t vfs_in, mp_obj_t path_in, mp_obj_t path_out) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 const char *old_path = mp_obj_str_get_str(path_in);
 const char *new_path = mp_obj_str_get_str(path_out);
	char fat_old_path[258] = "0:";
	char fat_new_path[258] = "0:";
	sprintf(fat_old_path, "%s%s", "0:", old_path);
	sprintf(fat_new_path, "%s%s", "0:", new_path);
	
 FRESULT res = f_rename(fat_old_path, fat_new_path);
 if (res == FR_EXIST) {
 // if new_path exists then try removing it (but only if it's a file)
 fat_vfs_remove_internal(vfs_in, path_out, 0); // 0 == file attribute
 // try to rename again
 res = f_rename(fat_old_path, fat_new_path);
 }
 if (res == FR_OK) {
 return mp_const_none;
 } else {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(fat_vfs_rename_obj, fat_vfs_rename);

STATIC mp_obj_t fat_vfs_mkdir(mp_obj_t vfs_in, mp_obj_t path_o) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 const char *path = mp_obj_str_get_str(path_o);
	char fat_path[258] = "0:";
	sprintf(fat_path, "%s%s", "0:", path);
	
 FRESULT res = f_mkdir(fat_path);
 if (res == FR_OK) {
 return mp_const_none;
 } else {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_mkdir_obj, fat_vfs_mkdir);

/// Change current directory.
STATIC mp_obj_t fat_vfs_chdir(mp_obj_t vfs_in, mp_obj_t path_in) {
#if FF_FS_RPATH >= 1
	mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 const char *path;
 path = mp_obj_str_get_str(path_in);

	char fat_path[258] = "0:";
	sprintf(fat_path, "%s%s", "0:", path);

 FRESULT res = f_chdir(fat_path);

 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
#endif

 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_chdir_obj, fat_vfs_chdir);

/// Get the current directory.
STATIC mp_obj_t fat_vfs_getcwd(mp_obj_t vfs_in) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 char buf[MICROPY_ALLOC_PATH_MAX + 1];
#if FF_FS_RPATH >= 2	
 FRESULT res = f_getcwd(buf, sizeof(buf));
 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
#endif	
 return mp_obj_new_str(buf, strlen(buf));
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fat_vfs_getcwd_obj, fat_vfs_getcwd);

/// \function stat(path)
/// Get the status of a file or directory.
STATIC mp_obj_t fat_vfs_stat(mp_obj_t vfs_in, mp_obj_t path_in) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 const char *path = mp_obj_str_get_str(path_in);
	char fat_path[258] = "0:";
	sprintf(fat_path, "%s%s", "0:", path);

 FILINFO fno;
 if (path[0] == 0 || (path[0] == '/' && path[1] == 0)) {
 // stat root directory
 fno.fsize = 0;
 fno.fdate = 0x2821; // Jan 1, 2000
 fno.ftime = 0;
 fno.fattrib = AM_DIR;
 } else {
 FRESULT res = f_stat(fat_path, &fno);
 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
 }

 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));
 mp_int_t mode = 0;
 if (fno.fattrib & AM_DIR) {
 mode |= MP_S_IFDIR;
 } else {
 mode |= MP_S_IFREG;
 }
 mp_int_t seconds = timeutils_seconds_since_epoch(
 1980 + ((fno.fdate >> 9) & 0x7f),
 (fno.fdate >> 5) & 0x0f,
 fno.fdate & 0x1f,
 (fno.ftime >> 11) & 0x1f,
 (fno.ftime >> 5) & 0x3f,
 2 * (fno.ftime & 0x1f)
 );
 t->items[0] = MP_OBJ_NEW_SMALL_INT(mode); // st_mode
 t->items[1] = MP_OBJ_NEW_SMALL_INT(0); // st_ino
 t->items[2] = MP_OBJ_NEW_SMALL_INT(0); // st_dev
 t->items[3] = MP_OBJ_NEW_SMALL_INT(0); // st_nlink
 t->items[4] = MP_OBJ_NEW_SMALL_INT(0); // st_uid
 t->items[5] = MP_OBJ_NEW_SMALL_INT(0); // st_gid
 t->items[6] = mp_obj_new_int_from_uint(fno.fsize); // st_size
 t->items[7] = mp_obj_new_int_from_uint(seconds); // st_atime
 t->items[8] = mp_obj_new_int_from_uint(seconds); // st_mtime
 t->items[9] = mp_obj_new_int_from_uint(seconds); // st_ctime

 return MP_OBJ_FROM_PTR(t);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_stat_obj, fat_vfs_stat);

// Get the status of a VFS.
STATIC mp_obj_t fat_vfs_statvfs(mp_obj_t vfs_in, mp_obj_t path_in) {
 mp_obj_fat_vfs_t *self = MP_OBJ_TO_PTR(vfs_in);
 (void)path_in;

 DWORD nclst;
 FATFS *fatfs;
	const char *path = mp_obj_str_get_str(path_in);
	char fat_path[258] = "0:";
	sprintf(fat_path, "%s%s", "0:", path);
	
 FRESULT res = f_getfree(fat_path, &nclst, &fatfs);
 if (FR_OK != res) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }

 mp_obj_tuple_t *t = MP_OBJ_TO_PTR(mp_obj_new_tuple(10, NULL));

 t->items[0] = MP_OBJ_NEW_SMALL_INT(fatfs->csize * SECSIZE(fatfs)); // f_bsize
 t->items[1] = t->items[0]; // f_frsize
 t->items[2] = MP_OBJ_NEW_SMALL_INT((fatfs->n_fatent - 2)); // f_blocks
 t->items[3] = MP_OBJ_NEW_SMALL_INT(nclst); // f_bfree
 t->items[4] = t->items[3]; // f_bavail
 t->items[5] = MP_OBJ_NEW_SMALL_INT(0); // f_files
 t->items[6] = MP_OBJ_NEW_SMALL_INT(0); // f_ffree
 t->items[7] = MP_OBJ_NEW_SMALL_INT(0); // f_favail
 t->items[8] = MP_OBJ_NEW_SMALL_INT(0); // f_flags
 t->items[9] = MP_OBJ_NEW_SMALL_INT(FF_MAX_LFN); // f_namemax

 return MP_OBJ_FROM_PTR(t);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_2(fat_vfs_statvfs_obj, fat_vfs_statvfs);

STATIC mp_obj_t vfs_fat_mount(mp_obj_t self_in, mp_obj_t readonly, mp_obj_t mkfs) {
 fs_user_mount_t *self = MP_OBJ_TO_PTR(self_in);

 // Read-only device indicated by writeblocks[0] == MP_OBJ_NULL.
 // User can specify read-only device by:
 // 1. readonly=True keyword argument
 // 2. nonexistent writeblocks method (then writeblocks[0] == MP_OBJ_NULL already)
 if (mp_obj_is_true(readonly)) {
 self->blockdev.writeblocks[0] = MP_OBJ_NULL;
 }

 // check if we need to make the filesystem
 FRESULT res = (self->blockdev.flags & MP_BLOCKDEV_FLAG_NO_FILESYSTEM) ? FR_NO_FILESYSTEM : FR_OK;
 if (res == FR_NO_FILESYSTEM && mp_obj_is_true(mkfs)) {
 uint8_t working_buf[FF_MAX_SS];
		MKFS_PARM opt = {
			.fmt = FM_FAT32,
	 .n_fat = 2,
	 .align = 4096,
	 .n_root = 0, // use default
	 .au_size = 0, // auto selection
	 };
		
		res = f_mkfs("0:", &opt, working_buf, sizeof(working_buf));
 }
 if (res != FR_OK) {
 mp_raise_OSError(fresult_to_errno_table[res]);
 }
 self->blockdev.flags &= ~MP_BLOCKDEV_FLAG_NO_FILESYSTEM;

 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_3(vfs_fat_mount_obj, vfs_fat_mount);

STATIC mp_obj_t vfs_fat_umount(mp_obj_t self_in) {
 (void)self_in;
 // keep the FAT filesystem mounted internally so the VFS methods can still be used
 return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_1(fat_vfs_umount_obj, vfs_fat_umount);

STATIC const mp_rom_map_elem_t fat_vfs_locals_dict_table[] = {
 #if _FS_REENTRANT
 { MP_ROM_QSTR(MP_QSTR___del__), MP_ROM_PTR(&fat_vfs_del_obj) },
 #endif
 { MP_ROM_QSTR(MP_QSTR_mkfs), MP_ROM_PTR(&fat_vfs_mkfs_obj) },
 { MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&fat_vfs_open_obj) },
 { MP_ROM_QSTR(MP_QSTR_ilistdir), MP_ROM_PTR(&fat_vfs_ilistdir_obj) },
 { MP_ROM_QSTR(MP_QSTR_mkdir), MP_ROM_PTR(&fat_vfs_mkdir_obj) },
 { MP_ROM_QSTR(MP_QSTR_rmdir), MP_ROM_PTR(&fat_vfs_rmdir_obj) },
 { MP_ROM_QSTR(MP_QSTR_chdir), MP_ROM_PTR(&fat_vfs_chdir_obj) },
 { MP_ROM_QSTR(MP_QSTR_getcwd), MP_ROM_PTR(&fat_vfs_getcwd_obj) },
 { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&fat_vfs_remove_obj) },
 { MP_ROM_QSTR(MP_QSTR_rename), MP_ROM_PTR(&fat_vfs_rename_obj) },
 { MP_ROM_QSTR(MP_QSTR_stat), MP_ROM_PTR(&fat_vfs_stat_obj) },
 { MP_ROM_QSTR(MP_QSTR_statvfs), MP_ROM_PTR(&fat_vfs_statvfs_obj) },
 { MP_ROM_QSTR(MP_QSTR_mount), MP_ROM_PTR(&vfs_fat_mount_obj) },
 { MP_ROM_QSTR(MP_QSTR_umount), MP_ROM_PTR(&fat_vfs_umount_obj) },
};
STATIC MP_DEFINE_CONST_DICT(fat_vfs_locals_dict, fat_vfs_locals_dict_table);

STATIC const mp_vfs_proto_t fat_vfs_proto = {
 .import_stat = fat_vfs_import_stat,
};

const mp_obj_type_t mp_fat_vfs_type = {
 { &mp_type_type },
 .name = MP_QSTR_VfsFat,
 .make_new = fat_vfs_make_new,
 .protocol = &fat_vfs_proto,
 .locals_dict = (mp_obj_dict_t *)&fat_vfs_locals_dict,

};

#endif // MICROPY_VFS_FAT