"""XDG directories and library layout."""
from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path

APP_DIRNAME = "mhwilds-mod-manager"


@dataclass(frozen=True)
class Paths:
    data_dir: Path
    config_dir: Path

    @classmethod
    def default(cls) -> "Paths":
        home = Path.home()
        data = Path(os.environ.get("XDG_DATA_HOME") or home / ".local/share")
        conf = Path(os.environ.get("XDG_CONFIG_HOME") or home / ".config")
        return cls(data / APP_DIRNAME, conf / APP_DIRNAME)

    @property
    def mods_dir(self) -> Path:
        return self.data_dir / "mods"

    @property
    def downloads_dir(self) -> Path:
        return self.data_dir / "downloads"

    @property
    def state_dir(self) -> Path:
        return self.data_dir / "state"

    @property
    def backup_dir(self) -> Path:
        return self.state_dir / "backup"

    @property
    def trash_dir(self) -> Path:
        return self.state_dir / "trash"

    @property
    def manifest_file(self) -> Path:
        return self.state_dir / "deployed.json"

    @property
    def baseline_file(self) -> Path:
        return self.state_dir / "pak-baseline.json"

    @property
    def settings_file(self) -> Path:
        return self.config_dir / "settings.json"

    @property
    def profiles_file(self) -> Path:
        return self.config_dir / "profiles.json"

    @property
    def secrets_file(self) -> Path:
        return self.config_dir / "secrets.json"

    def ensure(self) -> None:
        for d in (self.mods_dir, self.downloads_dir, self.state_dir, self.backup_dir, self.config_dir):
            d.mkdir(parents=True, exist_ok=True)