#
# Copyright (c) 2021-2026 ahriman team.
#
# This file is part of ahriman
# (see https://github.com/arcan1s/ahriman).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
from dataclasses import dataclass, fields
from typing import Any, Self

from ahriman.core.utils import filter_json
from ahriman.models.package import Package


@dataclass(frozen=True, kw_only=True)
class RepositoryStats:
    """
    repository stats representation
    """

    bases: int
    packages: int
    archive_size: int
    installed_size: int

    @classmethod
    def from_json(cls, dump: dict[str, Any]) -> Self:
        """
        construct counters from JSON dump

        Args:
            dump(dict[str, Any]): JSON dump body

        Returns:
            Self: status counters
        """
        # filter to only known fields
        known_fields = [pair.name for pair in fields(cls)]
        return cls(**filter_json(dump, known_fields))

    @classmethod
    def from_packages(cls, packages: list[Package]) -> Self:
        """
        construct statistics from list of repository packages

        Args:
            packages(list[Packages]): list of repository packages

        Returns:
            Self: constructed statistics object
        """
        return cls(
            bases=len(packages),
            packages=sum(len(package.packages) for package in packages),
            archive_size=sum(
                archive.archive_size or 0
                for package in packages
                for archive in package.packages.values()
            ),
            installed_size=sum(
                archive.installed_size or 0
                for package in packages
                for archive in package.packages.values()
            ),
        )
