from pathlib import Path

from config import STORAGE_DIR, PROJECTS_DIR, PROJECT_ROOT

THEMEN_DIR = STORAGE_DIR / "themen"


def _safe(name: str) -> str:
    return name.replace("/", "_").replace("\x00", "")


def topic_dir(topic: str) -> Path:
    return THEMEN_DIR / _safe(topic)


def arbeit_dir(topic: str) -> Path:
    return topic_dir(topic) / "arbeit"


def bausteine_path(topic: str) -> Path:
    return topic_dir(topic) / "bausteine.md"


def subbausteine_path(topic: str) -> Path:
    """Sidecar: pro Baustein die Subbausteine mit Stufe (von allen Guides geteilt)."""
    return topic_dir(topic) / "subbausteine.json"


def quelle_path(topic: str) -> Path:
    """Persistierte Quellen-Wahl pro Thema: {type, ort, spec}."""
    return topic_dir(topic) / "quelle.json"


def quelle_crawl_dir(topic: str) -> Path:
    """Zielordner für gecrawlte Link-Quellen (Seiten + PDF-.txt)."""
    return topic_dir(topic) / "quelle"


def safe_ordner(ort: str) -> Path | None:
    """Ordnerpfad relativ zum Repo-Root, gesandboxt. None bei leer/Ausbruch (../, absolut außerhalb)."""
    if not ort or not ort.strip():
        return None
    p = (PROJECT_ROOT / ort.strip()).resolve()
    try:
        p.relative_to(PROJECT_ROOT)
    except ValueError:
        return None
    return p


def guide_content_path(topic: str, format_name: str) -> Path:
    return topic_dir(topic) / "guides" / f"{format_name}.json"


def bausteine_topics() -> list[str]:
    """Themen, für die ein Themen-Ordner existiert."""
    if not THEMEN_DIR.is_dir():
        return []
    return [d.name for d in THEMEN_DIR.iterdir() if d.is_dir()]


def project_dir(name: str) -> Path:
    return PROJECTS_DIR / name