#!/usr/bin/env python3
from datetime import datetime
import pathlib
import re

import pytz
from suntime import Sun

_here = pathlib.Path(__file__).resolve().parent

def _read_conf(path):
    conf = {}
    try:
        with open(path) as f:
            for line in f:
                line = line.strip()
                if not line or line.startswith('#') or '=' not in line:
                    continue
                k, v = line.split('=', 1)
                k = k.strip()
                v = v.strip()
                v = re.sub(r'\s+#.*$', '', v)   # strip inline comments
                v = v.strip('"').strip("'")
                # Extract default from bash ${VAR:-default} pattern
                m = re.match(r'^\$\{[^}]+:-([^}]*)\}$', v)
                if m:
                    v = m.group(1).strip('"').strip("'")
                conf[k] = v
    except FileNotFoundError:
        pass
    return conf

conf = _read_conf(_here / 'sky-cam.conf')
# .env overrides sky-cam.conf — mirrors the sourcing order at the bottom of sky-cam.conf
conf.update(_read_conf(_here / '.env'))

for _key in ('LATITUDE', 'LONGITUDE', 'TIMEZONE'):
    if not conf.get(_key):
        raise SystemExit(f"sunrise.py: {_key} not set in sky-cam.conf or .env")

latitude  = float(conf['LATITUDE'])
longitude = float(conf['LONGITUDE'])
tz        = pytz.timezone(conf['TIMEZONE'])

sun = Sun(latitude, longitude)
now = datetime.now(tz)
sunrise_utc = sun.get_sunrise_time(now)
sunrise_time = sunrise_utc.astimezone(tz)

print(sunrise_time.strftime('%Y-%m-%d %H:%M:%S'))