from dataclasses import dataclass
from typing import Optional

from frostfs_sdk.models.dto.version import Version, DEFAULT_MAJOR_VERSION, DEFAULT_MINOR_VERSION


class MetaHeader:
    def __init__(self, version=None, epoch: int = 0, ttl: int = 2):
        """
        Initializes a MetaHeader object.

        :param version: A Version object representing the version.
        :param epoch: An integer representing the epoch (default: 0).
        :param ttl: An integer representing the time-to-live (default: 2).
        """
        self._version = None
        self._epoch = None
        self._ttl = None

        # Set default values if not provided
        self.set_version(version or Version(DEFAULT_MAJOR_VERSION, DEFAULT_MINOR_VERSION))
        self.set_epoch(epoch)
        self.set_ttl(ttl)

    def get_version(self):
        return self._version

    def get_epoch(self):
        return self._epoch

    def get_ttl(self):
        return self._ttl

    def set_version(self, version):
        if version is None:
            raise ValueError(f"Input parameter is missing: {Version.__name__}")
        self._version = version

    def set_epoch(self, epoch: int):
        if epoch < 0:
            raise ValueError("Epoch must be greater than or equal to zero")
        self._epoch = epoch

    def set_ttl(self, ttl: int):
        if ttl <= 0:
            raise ValueError("TTL must be greater than zero")
        self._ttl = ttl