"""User-specific paths, with compatibility for existing checkout installations."""
import os
from pathlib import Path


def user_directory(variable, fallback):
    value = os.environ.get(variable, '')
    # XDG paths must be absolute; ignore empty or relative values.
    base = Path(value) if value and Path(value).is_absolute() else Path.home() / fallback
    return base / 'ocado-grocy'


def config_file():
    # Keep an existing installation on its original journal until migrated.
    legacy = Path('config.toml')
    return legacy if legacy.exists() else user_directory('XDG_CONFIG_HOME', '.config') / 'config.toml'


def state_directory():
    return user_directory('XDG_STATE_HOME', '.local/state')


def archive_directory():
    if Path('config.toml').exists():
        return Path('history')
    return user_directory('XDG_DATA_HOME', '.local/share') / 'history'


def browser_directory():
    if Path('config.toml').exists():
        return Path('.ocado-browser')
    return state_directory() / 'browser'


def journal_file(settings, config_path):
    configured = settings.get('import', {}).get('state_file')
    if configured:
        path = Path(configured).expanduser()
        return path if path.is_absolute() else config_path.resolve().parent / path
    user_config = user_directory('XDG_CONFIG_HOME', '.config') / 'config.toml'
    if config_path.resolve() == user_config.resolve():
        return state_directory() / 'imports.sqlite3'
    # Explicit custom/legacy configs retain the historical relative default.
    return config_path.resolve().parent / 'imports.sqlite3'