"""Configuration constants and EPG timespan parsing."""

import os
import re
from pathlib import Path

DATA_ROOT = Path("/data")
MOVIES_ROOT = Path("/movies")
SERIES_ROOT = Path("/series")
CHANNELS_FILE = DATA_ROOT / "channels.json"
VIDEO_EXTENSIONS = {".mkv", ".mp4", ".avi", ".mov", ".m4v", ".webm", ".wmv"}
DEFAULT_DURATION_SEC = 3600

# EPG timespan (parsed from EPG_TIMESPAN env)
EPG_TIMESPAN_DAYS = 14.0
EPG_TIMESPAN_SEC = 14.0 * 24 * 3600
SCHEDULE_CACHE_TTL_SEC = (14 * 24 - 3) * 3600


def _parse_epg_timespan(value: str) -> tuple[float, float]:
    """Parse EPG_TIMESPAN env (e.g. '2d', '14d', '48h'). Returns (days, seconds)."""
    value = (value or "").strip().lower()
    if not value:
        return 14.0, 14.0 * 24 * 3600
    m = re.match(r"^(\d+(?:\.\d+)?)\s*([dh])?$", value)
    if not m:
        return 14.0, 14.0 * 24 * 3600
    num = float(m.group(1))
    unit = m.group(2) or "d"
    days = num / 24.0 if unit == "h" else num
    sec = days * 24 * 3600
    return days, sec


def init_epg_timespan() -> None:
    """Load EPG_TIMESPAN from env and set EPG_* and SCHEDULE_CACHE_TTL_SEC."""
    global EPG_TIMESPAN_DAYS, EPG_TIMESPAN_SEC, SCHEDULE_CACHE_TTL_SEC
    days, sec = _parse_epg_timespan(os.environ.get("EPG_TIMESPAN", ""))
    EPG_TIMESPAN_DAYS = days
    EPG_TIMESPAN_SEC = sec
    schedule_ttl = sec - 3 * 3600
    SCHEDULE_CACHE_TTL_SEC = max(3600, schedule_ttl)


init_epg_timespan()

# TMDB (The Movie Database) for EPG metadata — Dutch (nl). Set TMDB_API_KEY.
TMDB_API_BASE = "https://api.themoviedb.org/3"
TMDB_LANGUAGE = "nl"
TMDB_CACHE_TTL_SEC = 24 * 3600
TMDB_RATE_LIMIT_REQUESTS = 40
TMDB_RATE_LIMIT_WINDOW_SEC = 10.0
TMDB_CACHE_DIR = DATA_ROOT / "tmdb_cache"
try:
    TMDB_PREFETCH_INTERVAL_SEC = int(os.environ.get("TMDB_PREFETCH_INTERVAL_SEC", str(6 * 3600)))
except (TypeError, ValueError):
    TMDB_PREFETCH_INTERVAL_SEC = 6 * 3600
TMDB_IMAGE_BASE = "https://image.tmdb.org/t/p"
TMDB_IMAGE_STILL_SIZE = "w500"

# Preferred audio languages for streaming (in order): Dutch → Flemish → default
PREFERRED_AUDIO_LANGUAGES = ("nld", "dut", "nl", "vls")