import time
from tasks.server_log import ServerLogTask
from components import APid, AHeater


def _safe_filename_part(text):
	return "".join(c if c.isalnum() or c in "-_" else "_" for c in text) or "Sud"


class SudLogTask(ServerLogTask):
	"""Records temp/power samples for a single Sud run - same sample format
	as ServerLogTask, but only while a run is active: recording starts on
	Play and is written out on Stop (or natural completion), to
	logs/log_{date_time}_{sud_name}.log. A Pause/resume doesn't start a new
	file - only a fresh Play (from IDLE/DONE) does."""

	def __init__(self, tc: APid, heater: AHeater, heater_task, sud, interval, path='./logs', config=None, dt=None, log_interval=None):
		ServerLogTask.__init__(self, tc, heater, heater_task, interval, path, config, dt, log_interval)
		self.sud = sud
		self._active = False

	def _should_sample(self):
		return self._active

	def _filename(self):
		name_part = _safe_filename_part(self.sud.name or 'Sud')
		return 'log_{}_{}.log'.format(self._run_id, name_part)

	def start_run(self):
		if self._active:
			return
		self._samples = []
		self._t0 = time.monotonic()
		self._last_write = self._t0
		self._run_id = time.strftime("%Y%m%dT%H%M%S", time.localtime())
		self._active = True

	def stop_run(self):
		if not self._active:
			return
		self._active = False
		self.write()
		self._param_events = []