#!/usr/bin/env python3
"""Get a solar forecast from forecast.solar and emit it in Influx format
Nelson Minar <nelson@monkey.org>
"""

import json, sys, urllib.request
import pendulum

forecast_url = 'https://api.forecast.solar/estimate/watts/39.2/-121.1/35/70/11.5'


def parse(fp):
	data = json.load(fp)
	tz_name = data['message']['info']['timezone']
	for date, watts in data.get('result', {}).items():
		dt = pendulum.parse(date, tz=tz_name)
		ts = dt.int_timestamp * 1_000_000_000
		kw = watts / 1000.0
		print(f'forecast_dot_solar kw={kw:.4} {ts}')


if __name__ == '__main__':
	if len(sys.argv) == 1:
		parse(urllib.request.urlopen(forecast_url, timeout=120))
	for fn in sys.argv[1:]:
		parse(open(fn))