# distutils: language = c++

"""placeholder module for compilation"""

from __future__ import annotations

import datetime
import hashlib
import struct
import time

import cython
import dopt_basics.datetime

# from cython.cimports.cpython.ref import Py_INCREF, PyObject
from polluck_blockchain.block cimport Block
from libcpp.unordered_map cimport unordered_map
from libcpp.string cimport string

ctypedef unsigned long ULong

# cdef struct PyStringC:
#     char* ptr
#     Py_ssize_t length


# cdef PyStringC_to_unicode(PyStringC string):
#     return string.ptr[: string.length].decode("UTF-8", "strict")


# cdef PyStringC_to_bytes(PyStringC string):
#     return <bytes>string.ptr[: string.length]



cdef timestamp_to_datetime(double ts):
    return datetime.datetime.fromtimestamp(ts, dopt_basics.datetime.TIMEZONE_UTC)


# cdef class StringHolder:
#     cdef readonly PyStringC c
#     cdef object _py_data

#     def __cinit__(self, data: str):
#         """accepting Python str

#         Parameters
#         ----------
#         data : str
#             _description_
#         """
#         if not isinstance(data, str):
#             raise TypeError("Data not 'str'")

#         self._py_data = data.encode("UTF-8")
#         self.c = PyStringC(self._py_data, len(self._py_data))

#     @property
#     def py_string(self):
#         return PyStringC_to_unicode(self.c)

#     @property
#     def py_bytes(self):
#         return PyStringC_to_bytes(self.c)


# BlockC = cython.struct(
#     index=cython.ulonglong,
#     timestamp=cython.double,
#     data=PyStringC,
#     previous_hash=PyStringC,
#     nonce=cython.ulonglong,
# )


cdef float_to_bytes(double num):
    return struct.pack(">d", num)

# cdef struct BlockC:
#     ULong _index
#     double _timestamp
#     string _data
#     string _prev_hash
#     ULong _nonce
#     string _hash


cdef class BlockPy:
    cdef:
        ULong _index
        double _timestamp
        string _data
        string _prev_hash
        ULong _nonce
        string _hash
        Block* Block

    def __cinit__(self, 
        index: int,
        data: str,
        previous_hash: str,
        nonce: int,
    ):
        self.Block = new Block(
            index,
            datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
            nonce,
            data.encode("UTF-8"),
            previous_hash.encode("UTF-8"),
            "".encode("UTF-8"),
        )

    def get_data(self):
        return self.Block.data.decode("UTF-8")

    # def __init__(
    #     self,
    #     index: int,
    #     data: str,
    #     previous_hash: str,
    #     nonce: int,
    # ):
        # self.C = new BlockC(
        #     index,
        #     datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp(),
        #     data.encode("UTF-8"),
        #     previous_hash.encode("UTF-8"),
        #     nonce,
        #     "".encode("UTF-8"),
        # )
        # self._index = index
        # # self._timestamp = dopt_basics.datetime.current_time_tz().timestamp()
        # self._timestamp = datetime.datetime(2025, 12, 1, 12, 0, 0).timestamp()
        # self._data = data.encode("UTF-8")
        # self._prev_hash = previous_hash.encode("UTF-8")
        # self._nonce = nonce
        # self._hash = "".encode("UTF-8")

    # cpdef _perform_hash(self):
    #     parts = bytearray()
    #     parts.extend(self._index.to_bytes(8, "big"))
    #     parts.extend(float_to_bytes(self._timestamp))
    #     parts.extend(self._data)
    #     parts.extend(self._prev_hash)
    #     parts.extend(self._nonce.to_bytes(8, "big"))

    #     return hashlib.sha256(parts)

    # def compute_hash_bytes(self):
    #     return self._perform_hash().digest()

    # def compute_hash(self):
    #     return self._perform_hash().hexdigest()

    # # Python public API
    # @property
    # def index(self):
    #     return self._index

    # @property
    # def timestamp(self):
    #     return timestamp_to_datetime(self._timestamp)

    # @property
    # def data(self):
    #     return self._data.decode("UTF-8")

    # @property
    # def prev_hash(self):
    #     return self._prev_hash.decode("UTF-8")

    # @property
    # def nonce(self):
    #     return self._nonce

    # @nonce.setter
    # def nonce(self, value: int):
    #     self._nonce = value

    # @property
    # def hash(self):
    #     return self._hash.decode("UTF-8")

    # @hash.setter
    # def hash(self, value: str):
    #     if not isinstance(value, str):
    #         raise TypeError("No string")
    #     self._hash = value.encode("UTF-8")


# cdef class Blockchain:
#     cdef int _difficulty
#     cdef size_t _index
#     cdef unordered_map[size_t, int] _chain

#     def __cinit__(self):
#         self._difficulty = 1
#         self._index = <size_t>0
#         # self._chain = new unordered_map[size_t, Block]()

#     def __init__(
#         self,
#         difficulty: int = 1,
#     ) -> None:
#         self._difficulty = difficulty

    # @property
    # def index(self):
    #     return self._index

    # @property
    # def difficulty(self):
    #     return self._difficulty

    # cdef create_genesis_block(self):
    #     genesis = Block(
    #         index=0,
    #         data="Genesis Block",
    #         previous_hash="0",
    #         nonce=0,
    #     )
    #     genesis.hash = genesis.compute_hash()
    #     self.chain[self._index] = genesis

    # cdef proof_of_work(self, block: Block):
    #     prefix = "0" * self._difficulty
    #     while True:
    #         block_hash = block.compute_hash()
    #         if block_hash.startswith(prefix):
    #             return block_hash
    #         block._nonce += 1

    # cdef add_block(self, data: str):
    #     prev_hash = self.chain[self._index].hash
    #     new_block = Block(
    #         index=(self._index + 1),
    #         data=data,
    #         previous_hash=prev_hash,
    #         nonce=0,
    #     )

    #     # start = time.perf_counter()
    #     new_block.hash = self.proof_of_work(new_block)
    #     # elapsed = time.perf_counter() - start

    #     self.chain.append(new_block)
    #     self._index += 1
    #     print(f"Mined block {new_block.index} with nonce={new_block.nonce}")
    #     # print(f"Mined block {new_block.index} in {elapsed:.3f}s with nonce={new_block.nonce}")

    #     return new_block