"""Package concern loading for Decman profiles."""

from __future__ import annotations

from pathlib import Path

import decman
from decman.plugins import aur, pacman

from modules import npm_packages

ROOT = Path(__file__).resolve().parents[1]
PACKAGES = ROOT / "packages"


def _names(path: Path) -> set[str]:
    return {
        line.strip()
        for line in path.read_text(encoding="utf-8").splitlines()
        if line.strip()
    }


class PackageConcern(decman.Module):
    """One named concern backed by native and AUR package lists."""

    def __init__(self, concern: str) -> None:
        super().__init__(f"packages:{concern}")
        self.concern = concern

    @pacman.packages
    def native_packages(self) -> set[str]:
        return _names(PACKAGES / f"{self.concern}-repo.txt")

    @aur.packages
    def aur_packages(self) -> set[str]:
        return _names(PACKAGES / f"{self.concern}-aur.txt")

    @npm_packages.packages
    def global_npm_packages(self) -> set[str]:
        path = PACKAGES / f"{self.concern}-npm.txt"
        return _names(path) if path.exists() else set()


def configure_no_removal_guard() -> None:
    """Keep Decman from pruning current dependency-orphans during adoption."""
    if decman.pacman is None or decman.aur is None:
        raise decman.SourceError("pacman and AUR plugins must be available")
    decman.pacman.ignored_packages |= _names(PACKAGES / "ignored/repo-dependencies.txt")
    decman.aur.ignored_packages |= _names(PACKAGES / "ignored/aur-dependencies.txt")