"""XDG-compliant path constants for DevFlow."""

import os
from pathlib import Path


def _xdg(env_var: str, fallback: str) -> Path:
    return Path(os.environ.get(env_var, fallback))


HOME = Path.home()

CONFIG_DIR = _xdg("XDG_CONFIG_HOME", str(HOME / ".config")) / "devflow"
DATA_DIR = _xdg("XDG_DATA_HOME", str(HOME / ".local" / "share")) / "devflow"
STATE_DIR = _xdg("XDG_STATE_HOME", str(HOME / ".local" / "state")) / "devflow"

MANIFEST_FILE = CONFIG_DIR / "manifest.yaml"
CONFIG_FILE = CONFIG_DIR / "config"

DOTFILES_DIR = DATA_DIR / "dotfiles"
PACKAGES_DIR = DATA_DIR / "packages"
SCRATCH_DIR = DATA_DIR / "scratch"
PROJECTS_DIR = HOME / "projects"

LINKED_STATE = STATE_DIR / "linked.json"
INSTALLED_STATE = STATE_DIR / "installed.json"

# Self-hosted flow config paths (from dotfiles repo)
DOTFILES_FLOW_CONFIG = DOTFILES_DIR / "flow" / ".config" / "flow"
DOTFILES_MANIFEST = DOTFILES_FLOW_CONFIG / "manifest.yaml"
DOTFILES_CONFIG = DOTFILES_FLOW_CONFIG / "config"


def ensure_dirs() -> None:
    """Create all required directories if they don't exist."""
    for d in (CONFIG_DIR, DATA_DIR, STATE_DIR, PACKAGES_DIR, SCRATCH_DIR):
        d.mkdir(parents=True, exist_ok=True)