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// This file is part of the CircuitPython project: https://circuitpython.org

//

// SPDX-FileCopyrightText: Copyright (c) 2017 Scott Shawcroft for Adafruit Industries

//

// SPDX-License-Identifier: MIT

#include "py/binary.h"

#include "py/runtime.h"

#include "py/runtime0.h"

#include "shared-bindings/nvm/ByteArray.h"

//| class ByteArray:

//| r"""Presents a stretch of non-volatile memory as a bytearray.

//|

//| Non-volatile memory is available as a byte array that persists over reloads

//| and power cycles. Each assignment causes an erase and write cycle so its recommended to assign

//| all values to change at once.

//|

//| Usage::

//|

//| import microcontroller

//| microcontroller.nvm[0:3] = b"\xcc\x10\x00"

//| """

//|

//| def __init__(self) -> None:

//| """Not currently dynamically supported. Access the sole instance through `microcontroller.nvm`."""

//| ...

//|

//| def __bool__(self) -> bool: ...

//| def __len__(self) -> int:

//| """Return the length. This is used by (`len`)"""

//| ...

//|

static mp_obj_t nvm_bytearray_unary_op(mp_unary_op_t op, mp_obj_t self_in) {

nvm_bytearray_obj_t *self = MP_OBJ_TO_PTR(self_in);

uint16_t len = common_hal_nvm_bytearray_get_length(self);

switch (op) {

case MP_UNARY_OP_BOOL:

return mp_obj_new_bool(len != 0);

case MP_UNARY_OP_LEN:

return MP_OBJ_NEW_SMALL_INT(len);

default:

return MP_OBJ_NULL; // op not supported

}

}

static const mp_rom_map_elem_t nvm_bytearray_locals_dict_table[] = {

};

static MP_DEFINE_CONST_DICT(nvm_bytearray_locals_dict, nvm_bytearray_locals_dict_table);

//| @overload

//| def __getitem__(self, index: slice) -> bytearray: ...

//| @overload

//| def __getitem__(self, index: int) -> int:

//| """Returns the value at the given index."""

//| ...

//|

//| @overload

//| def __setitem__(self, index: slice, value: ReadableBuffer) -> None: ...

//| @overload

//| def __setitem__(self, index: int, value: int) -> None:

//| """Set the value at the given index."""

//| ...

//|

//|

static mp_obj_t nvm_bytearray_subscr(mp_obj_t self_in, mp_obj_t index_in, mp_obj_t value) {

if (value == MP_OBJ_NULL) {

// delete item

// slice deletion

return MP_OBJ_NULL; // op not supported

} else {

nvm_bytearray_obj_t *self = MP_OBJ_TO_PTR(self_in);

if (0) {

#if MICROPY_PY_BUILTINS_SLICE

} else if (mp_obj_is_type(index_in, &mp_type_slice)) {

mp_bound_slice_t slice;

if (!mp_seq_get_fast_slice_indexes(common_hal_nvm_bytearray_get_length(self), index_in, &slice)) {

mp_raise_NotImplementedError(MP_ERROR_TEXT("only slices with step=1 (aka None) are supported"));

}

if (value != MP_OBJ_SENTINEL) {

#if MICROPY_PY_ARRAY_SLICE_ASSIGN

// Assign

size_t src_len = slice.stop - slice.start;

uint8_t *src_items;

if (mp_obj_is_type(value, &mp_type_array) ||

mp_obj_is_type(value, &mp_type_bytearray) ||

mp_obj_is_type(value, &mp_type_memoryview) ||

mp_obj_is_type(value, &mp_type_bytes)) {

mp_buffer_info_t bufinfo;

mp_get_buffer_raise(value, &bufinfo, MP_BUFFER_READ);

if (bufinfo.len != src_len) {

mp_raise_ValueError(MP_ERROR_TEXT("Slice and value different lengths."));

}

src_len = bufinfo.len;

src_items = bufinfo.buf;

if (1 != mp_binary_get_size('@', bufinfo.typecode, NULL)) {

mp_raise_ValueError(MP_ERROR_TEXT("Array values should be single bytes."));

}

} else {

mp_raise_NotImplementedError(MP_ERROR_TEXT("array/bytes required on right side"));

}

if (!common_hal_nvm_bytearray_set_bytes(self, slice.start, src_items, src_len)) {

mp_raise_RuntimeError(MP_ERROR_TEXT("Unable to write to nvm."));

}

return mp_const_none;

#else

return MP_OBJ_NULL; // op not supported

#endif

} else {

// Read slice.

size_t len = slice.stop - slice.start;

uint8_t *items = m_new(uint8_t, len);

common_hal_nvm_bytearray_get_bytes(self, slice.start, len, items);

return mp_obj_new_bytearray_by_ref(len, items);

}

#endif

} else {

// Single index rather than slice.

size_t index = mp_get_index(self->base.type, common_hal_nvm_bytearray_get_length(self),

index_in, false);

if (value == MP_OBJ_SENTINEL) {

// load

uint8_t value_out;

common_hal_nvm_bytearray_get_bytes(self, index, 1, &value_out);

return MP_OBJ_NEW_SMALL_INT(value_out);

} else {

// store

mp_int_t byte_value = mp_obj_get_int(value);

mp_arg_validate_int_range(byte_value, 0, 255, MP_QSTR_bytes);

uint8_t short_value = byte_value;

if (!common_hal_nvm_bytearray_set_bytes(self, index, &short_value, 1)) {

mp_raise_RuntimeError(MP_ERROR_TEXT("Unable to write to nvm."));

}

return mp_const_none;

}

}

}

}

MP_DEFINE_CONST_OBJ_TYPE(

nvm_bytearray_type,

MP_QSTR_ByteArray,

MP_TYPE_FLAG_NONE,

locals_dict, &nvm_bytearray_locals_dict,

subscr, nvm_bytearray_subscr,

unary_op, nvm_bytearray_unary_op

);