#!/usr/bin/env python3
"""Pins plugswitch.py's rule: `off` only when 20 s of readings show the machine is off."""
import os, sys, unittest
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
from plugswitch import off_allowed  # noqa: E402

OFF = [(t, 0.4, False) for t in range(0, 20, 2)]


class Rule(unittest.TestCase):
    def test_off_machine_allowed(self):
        self.assertTrue(off_allowed(OFF, 0.3)[0])

    def test_running_machine_refused_by_watts(self):
        s = OFF[:5] + [(10, 7.2, False)] + OFF[6:]
        ok, why = off_allowed(s, 0.3)
        self.assertFalse(ok); self.assertIn('draws power', why)

    def test_ping_answer_refused(self):
        s = OFF[:-1] + [(18, 0.4, True)]
        ok, why = off_allowed(s, 0.3)
        self.assertFalse(ok); self.assertIn('ping', why)

    def test_failed_read_refused(self):
        s = OFF[:3] + [(6, None, False)] + OFF[4:]
        self.assertFalse(off_allowed(s, 0.3)[0])

    def test_short_window_refused(self):
        self.assertFalse(off_allowed(OFF[:4], 0.3)[0])

    def test_no_standby_refused(self):
        self.assertFalse(off_allowed(OFF, None)[0])

    def test_edge_exactly_at_limit_refused(self):
        s = OFF[:-1] + [(18, 1.3, False)]
        self.assertFalse(off_allowed(s, 0.3)[0])


if __name__ == '__main__':
    unittest.main()