"""Flat-file storage: JSON files per week for pointages, one file for congés."""
import json
from pathlib import Path

DATA_DIR = Path("/data")
POINTAGES_DIR = DATA_DIR / "pointages"
CONGES_FILE = DATA_DIR / "conges.json"
CONFIG_FILE = DATA_DIR / "config.json"

DEFAULT_CONFIG = {
    "heures_jour": 7.8,   # 7h48 = 39h/semaine
}


def _ensure_dirs():
    POINTAGES_DIR.mkdir(parents=True, exist_ok=True)


# ---------- config ----------

def load_config() -> dict:
    _ensure_dirs()
    if CONFIG_FILE.exists():
        return json.loads(CONFIG_FILE.read_text())
    CONFIG_FILE.write_text(json.dumps(DEFAULT_CONFIG, indent=2))
    return DEFAULT_CONFIG.copy()


def save_config(cfg: dict):
    _ensure_dirs()
    CONFIG_FILE.write_text(json.dumps(cfg, indent=2, ensure_ascii=False))


# ---------- pointages ----------

def _week_file(year: int, week: int) -> Path:
    return POINTAGES_DIR / f"{year}-W{week:02d}.json"


def load_week_pointages(year: int, week: int) -> list[dict]:
    f = _week_file(year, week)
    if f.exists():
        return json.loads(f.read_text())
    return []


def save_week_pointages(year: int, week: int, pointages: list[dict]):
    _ensure_dirs()
    _week_file(year, week).write_text(json.dumps(pointages, indent=2, ensure_ascii=False))


def upsert_pointages(records: list[dict]):
    """Insert or update pointage records, grouped by ISO week."""
    from datetime import datetime
    by_week: dict[tuple, dict[str, dict]] = {}
    for r in records:
        d = datetime.strptime(r["date"], "%Y-%m-%d").date()
        iso = d.isocalendar()
        key = (iso.year, iso.week)
        by_week.setdefault(key, {})
        by_week[key][r["date"]] = r

    for (year, week), new_by_date in by_week.items():
        existing = {p["date"]: p for p in load_week_pointages(year, week)}
        existing.update(new_by_date)
        save_week_pointages(year, week, sorted(existing.values(), key=lambda p: p["date"]))


def list_all_weeks() -> list[tuple[int, int]]:
    """Return sorted list of (year, week) for which we have data."""
    _ensure_dirs()
    weeks = []
    for f in POINTAGES_DIR.glob("????-W??.json"):
        parts = f.stem.split("-W")
        if len(parts) == 2:
            weeks.append((int(parts[0]), int(parts[1])))
    return sorted(weeks)


# ---------- congés ----------

def load_conges() -> list[dict]:
    if CONGES_FILE.exists():
        return json.loads(CONGES_FILE.read_text())
    return []


def save_conges(conges: list[dict]):
    _ensure_dirs()
    CONGES_FILE.write_text(json.dumps(conges, indent=2, ensure_ascii=False))


def toggle_conge(date: str, type_conge: str):
    assert type_conge in ("jour", "matin", "aprem")
    conges = load_conges()
    already = any(c["date"] == date and c["type"] == type_conge for c in conges)

    if already:
        conges = [c for c in conges if not (c["date"] == date and c["type"] == type_conge)]
    else:
        # Adding: remove conflicting entries first
        if type_conge == "jour":
            conges = [c for c in conges if c["date"] != date]
        else:
            conges = [c for c in conges if not (c["date"] == date and c["type"] == "jour")]
        conges.append({"date": date, "type": type_conge})

    conges.sort(key=lambda c: (c["date"], c["type"]))
    save_conges(conges)