import json
import mmap
import sys
import threading
import time
from collections import OrderedDict

from . import config


def is_valid(val, val_type="key"):
    """
        Utility method to check if the key-value pair satisfies the constraints
    """
    if val_type == "key":
        if not isinstance(val, str):
            raise ValueError(f"Key [{val}] must be of type str.")
        return len(val) <= config.MAX_KEY_LEN
    elif val_type == "value":
        if isinstance(val, dict):
            return sys.getsizeof(val) <= config.MAX_VALUE_SIZE
        raise ValueError(f"Value [{val}] must be of type dict.")


class DataStoreValueObject:
    def __init__(self, value, created_at, ttl, *args, **kwargs):
        self.value = value
        self.ttl = ttl
        self.created_at = created_at

    def is_expired(self):
        if self.ttl is None:
            return False
        curr_ts = int(time.time() * 1000)
        return (curr_ts - self.created_at) > self.ttl * 1000


class DataStore:
    def __init__(self, file_descriptor, *args, **kwargs):
        self.__fd = file_descriptor
        self.__mmap = self._get_mmaped_fd()
        self.__data = OrderedDict()
        self.__lock = threading.Lock()
        self._read_data()

    def _get_mmaped_fd(self) -> mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) -> None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\0')
        self.__data = json.loads(raw_data)

    def create(self, key, value, ttl=None) -> None:
        with self.__lock:
            if key in self.__data:
                raise ValueError(f"Key '{key}' already present.")
            if is_valid(key, val_type="key") and is_valid(value, val_type="value"):
                if ttl is not None:
                    try:
                        ttl = int(ttl)
                    except:
                        raise ValueError(f"Time-to-live {ttl} must be an integer value.")
                value_arr = [value, int(time.time() * 1000), ttl]
                self.__data[key] = value_arr
                self.flush()
            else:
                raise ValueError(
                    f"Either provided key(allowed_size:{config.MAX_KEY_LEN} characters) or value(allowed_size:{config.MAX_VALUE_SIZE} bytes) doesn't meet the size config.")

    def delete(self, key) -> None:
        """
            To delete key-value pair from data.
        """
        with self.__lock:
            if key not in self.__data:
                return  # Ignore if key is non-existent
            del self.__data[key]
            self.flush()

    def get(self, key) -> dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f"Key [{key}] not in datastore.")
            value = DataStoreValueObject(*self.__data.get(key))  # type: DataStoreValueObject
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f"Key [{key}] Time-to-live expired.")
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()

    def flush(self) -> None:
        """
            To write data to mmap
        """
        self.__mmap.seek(0)
        data_string = bytes(json.dumps(self.__data).encode('ascii'))
        self.__mmap.write(data_string)
        empty_space_bytes = self.__mmap.size() - self.__mmap.tell()
        self.__mmap[self.__mmap.tell():] = b'\0' * empty_space_bytes

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)

764a57ec09b29239add70bbd72dafeb4f48efcf2
<mask token>


class DataStore:
    <mask token>

    def _get_mmaped_fd(self) ->mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) ->None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\x00')
        self.__data = json.loads(raw_data)
    <mask token>
    <mask token>

    def get(self, key) ->dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f'Key [{key}] not in datastore.')
            value = DataStoreValueObject(*self.__data.get(key))
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f'Key [{key}] Time-to-live expired.')
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()
    <mask token>

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)

<mask token>


class DataStore:
    <mask token>

    def _get_mmaped_fd(self) ->mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) ->None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\x00')
        self.__data = json.loads(raw_data)

    def create(self, key, value, ttl=None) ->None:
        with self.__lock:
            if key in self.__data:
                raise ValueError(f"Key '{key}' already present.")
            if is_valid(key, val_type='key') and is_valid(value, val_type=
                'value'):
                if ttl is not None:
                    try:
                        ttl = int(ttl)
                    except:
                        raise ValueError(
                            f'Time-to-live {ttl} must be an integer value.')
                value_arr = [value, int(time.time() * 1000), ttl]
                self.__data[key] = value_arr
                self.flush()
            else:
                raise ValueError(
                    f"Either provided key(allowed_size:{config.MAX_KEY_LEN} characters) or value(allowed_size:{config.MAX_VALUE_SIZE} bytes) doesn't meet the size config."
                    )
    <mask token>

    def get(self, key) ->dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f'Key [{key}] not in datastore.')
            value = DataStoreValueObject(*self.__data.get(key))
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f'Key [{key}] Time-to-live expired.')
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()

    def flush(self) ->None:
        """
            To write data to mmap
        """
        self.__mmap.seek(0)
        data_string = bytes(json.dumps(self.__data).encode('ascii'))
        self.__mmap.write(data_string)
        empty_space_bytes = self.__mmap.size() - self.__mmap.tell()
        self.__mmap[self.__mmap.tell():] = b'\x00' * empty_space_bytes

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)

<mask token>


class DataStore:

    def __init__(self, file_descriptor, *args, **kwargs):
        self.__fd = file_descriptor
        self.__mmap = self._get_mmaped_fd()
        self.__data = OrderedDict()
        self.__lock = threading.Lock()
        self._read_data()

    def _get_mmaped_fd(self) ->mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) ->None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\x00')
        self.__data = json.loads(raw_data)

    def create(self, key, value, ttl=None) ->None:
        with self.__lock:
            if key in self.__data:
                raise ValueError(f"Key '{key}' already present.")
            if is_valid(key, val_type='key') and is_valid(value, val_type=
                'value'):
                if ttl is not None:
                    try:
                        ttl = int(ttl)
                    except:
                        raise ValueError(
                            f'Time-to-live {ttl} must be an integer value.')
                value_arr = [value, int(time.time() * 1000), ttl]
                self.__data[key] = value_arr
                self.flush()
            else:
                raise ValueError(
                    f"Either provided key(allowed_size:{config.MAX_KEY_LEN} characters) or value(allowed_size:{config.MAX_VALUE_SIZE} bytes) doesn't meet the size config."
                    )

    def delete(self, key) ->None:
        """
            To delete key-value pair from data.
        """
        with self.__lock:
            if key not in self.__data:
                return
            del self.__data[key]
            self.flush()

    def get(self, key) ->dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f'Key [{key}] not in datastore.')
            value = DataStoreValueObject(*self.__data.get(key))
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f'Key [{key}] Time-to-live expired.')
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()

    def flush(self) ->None:
        """
            To write data to mmap
        """
        self.__mmap.seek(0)
        data_string = bytes(json.dumps(self.__data).encode('ascii'))
        self.__mmap.write(data_string)
        empty_space_bytes = self.__mmap.size() - self.__mmap.tell()
        self.__mmap[self.__mmap.tell():] = b'\x00' * empty_space_bytes

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)

<mask token>


def is_valid(val, val_type='key'):
    """
        Utility method to check if the key-value pair satisfies the constraints
    """
    if val_type == 'key':
        if not isinstance(val, str):
            raise ValueError(f'Key [{val}] must be of type str.')
        return len(val) <= config.MAX_KEY_LEN
    elif val_type == 'value':
        if isinstance(val, dict):
            return sys.getsizeof(val) <= config.MAX_VALUE_SIZE
        raise ValueError(f'Value [{val}] must be of type dict.')


class DataStoreValueObject:

    def __init__(self, value, created_at, ttl, *args, **kwargs):
        self.value = value
        self.ttl = ttl
        self.created_at = created_at

    def is_expired(self):
        if self.ttl is None:
            return False
        curr_ts = int(time.time() * 1000)
        return curr_ts - self.created_at > self.ttl * 1000


class DataStore:

    def __init__(self, file_descriptor, *args, **kwargs):
        self.__fd = file_descriptor
        self.__mmap = self._get_mmaped_fd()
        self.__data = OrderedDict()
        self.__lock = threading.Lock()
        self._read_data()

    def _get_mmaped_fd(self) ->mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) ->None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\x00')
        self.__data = json.loads(raw_data)

    def create(self, key, value, ttl=None) ->None:
        with self.__lock:
            if key in self.__data:
                raise ValueError(f"Key '{key}' already present.")
            if is_valid(key, val_type='key') and is_valid(value, val_type=
                'value'):
                if ttl is not None:
                    try:
                        ttl = int(ttl)
                    except:
                        raise ValueError(
                            f'Time-to-live {ttl} must be an integer value.')
                value_arr = [value, int(time.time() * 1000), ttl]
                self.__data[key] = value_arr
                self.flush()
            else:
                raise ValueError(
                    f"Either provided key(allowed_size:{config.MAX_KEY_LEN} characters) or value(allowed_size:{config.MAX_VALUE_SIZE} bytes) doesn't meet the size config."
                    )

    def delete(self, key) ->None:
        """
            To delete key-value pair from data.
        """
        with self.__lock:
            if key not in self.__data:
                return
            del self.__data[key]
            self.flush()

    def get(self, key) ->dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f'Key [{key}] not in datastore.')
            value = DataStoreValueObject(*self.__data.get(key))
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f'Key [{key}] Time-to-live expired.')
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()

    def flush(self) ->None:
        """
            To write data to mmap
        """
        self.__mmap.seek(0)
        data_string = bytes(json.dumps(self.__data).encode('ascii'))
        self.__mmap.write(data_string)
        empty_space_bytes = self.__mmap.size() - self.__mmap.tell()
        self.__mmap[self.__mmap.tell():] = b'\x00' * empty_space_bytes

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)

import json
import mmap
import sys
import threading
import time
from collections import OrderedDict

from . import config


def is_valid(val, val_type="key"):
    """
        Utility method to check if the key-value pair satisfies the constraints
    """
    if val_type == "key":
        if not isinstance(val, str):
            raise ValueError(f"Key [{val}] must be of type str.")
        return len(val) <= config.MAX_KEY_LEN
    elif val_type == "value":
        if isinstance(val, dict):
            return sys.getsizeof(val) <= config.MAX_VALUE_SIZE
        raise ValueError(f"Value [{val}] must be of type dict.")


class DataStoreValueObject:
    def __init__(self, value, created_at, ttl, *args, **kwargs):
        self.value = value
        self.ttl = ttl
        self.created_at = created_at

    def is_expired(self):
        if self.ttl is None:
            return False
        curr_ts = int(time.time() * 1000)
        return (curr_ts - self.created_at) > self.ttl * 1000


class DataStore:
    def __init__(self, file_descriptor, *args, **kwargs):
        self.__fd = file_descriptor
        self.__mmap = self._get_mmaped_fd()
        self.__data = OrderedDict()
        self.__lock = threading.Lock()
        self._read_data()

    def _get_mmaped_fd(self) -> mmap.mmap:
        """
            To create an mmap object for a given file_descriptor. 
        """
        try:
            mmaped_fd = mmap.mmap(self.__fd, 0, access=mmap.ACCESS_WRITE)
            mmaped_fd.resize(config.MAX_LOCAL_STORAGE_SIZE)
            return mmaped_fd
        except mmap.error:
            raise

    def _read_data(self) -> None:
        """
            To read data from mmap and parse it as json
        """
        raw_data = self.__mmap[:].decode('ascii').rstrip('\0')
        self.__data = json.loads(raw_data)

    def create(self, key, value, ttl=None) -> None:
        with self.__lock:
            if key in self.__data:
                raise ValueError(f"Key '{key}' already present.")
            if is_valid(key, val_type="key") and is_valid(value, val_type="value"):
                if ttl is not None:
                    try:
                        ttl = int(ttl)
                    except:
                        raise ValueError(f"Time-to-live {ttl} must be an integer value.")
                value_arr = [value, int(time.time() * 1000), ttl]
                self.__data[key] = value_arr
                self.flush()
            else:
                raise ValueError(
                    f"Either provided key(allowed_size:{config.MAX_KEY_LEN} characters) or value(allowed_size:{config.MAX_VALUE_SIZE} bytes) doesn't meet the size config.")

    def delete(self, key) -> None:
        """
            To delete key-value pair from data.
        """
        with self.__lock:
            if key not in self.__data:
                return  # Ignore if key is non-existent
            del self.__data[key]
            self.flush()

    def get(self, key) -> dict:
        """
            Get the value in data for the given key.
        """
        with self.__lock:
            if key not in self.__data:
                raise ValueError(f"Key [{key}] not in datastore.")
            value = DataStoreValueObject(*self.__data.get(key))  # type: DataStoreValueObject
            if value.is_expired():
                self.__data.pop(key)
                self.flush()
                raise ValueError(f"Key [{key}] Time-to-live expired.")
            return value.value

    def delete_all(self):
        """
            To delete the entire database
        """
        with self.__lock:
            self.__data = dict()
            self.flush()

    def flush(self) -> None:
        """
            To write data to mmap
        """
        self.__mmap.seek(0)
        data_string = bytes(json.dumps(self.__data).encode('ascii'))
        self.__mmap.write(data_string)
        empty_space_bytes = self.__mmap.size() - self.__mmap.tell()
        self.__mmap[self.__mmap.tell():] = b'\0' * empty_space_bytes

    def __getitem__(self, item):
        """
            Dictionary method
        """
        return self.get(item)
