#!/usr/bin/env python3
"""Tests fuer die Helligkeitsregelung (verallgemeinert aus DoDimmen_V).

    python3 -m unittest -v test_brightness

Grenzen: Mitten (300, 2500, 3500) mit Hysterese (30, 150, 150)
 -> hoch bei 330 / 2650 / 3650, runter bei 270 / 2350 / 3350.
"""

import unittest

import brightness
from brightness import BrightnessController


class TestStufen(unittest.TestCase):

    def setUp(self):
        self.c = BrightnessController()

    def test_erststart_schaltet_von_0_hoch(self):
        self.assertEqual(self.c._next_level(329, None), 0)
        self.assertEqual(self.c._next_level(330, None), 1)
        self.assertEqual(self.c._next_level(2649, None), 1)
        self.assertEqual(self.c._next_level(2650, None), 2)
        self.assertEqual(self.c._next_level(3649, None), 2)
        self.assertEqual(self.c._next_level(3650, None), 3)   # 100 % erreichbar

    def test_hysterese_von_stufe_1(self):
        self.assertEqual(self.c._next_level(270, 1), 1)
        self.assertEqual(self.c._next_level(269, 1), 0)
        self.assertEqual(self.c._next_level(2649, 1), 1)
        self.assertEqual(self.c._next_level(2650, 1), 2)

    def test_hysterese_von_stufe_2(self):
        self.assertEqual(self.c._next_level(2350, 2), 2)
        self.assertEqual(self.c._next_level(2349, 2), 1)
        self.assertEqual(self.c._next_level(3649, 2), 2)
        self.assertEqual(self.c._next_level(3650, 2), 3)

    def test_hysterese_von_stufe_3(self):
        self.assertEqual(self.c._next_level(3350, 3), 3)
        self.assertEqual(self.c._next_level(3349, 3), 2)

    def test_prozente(self):
        self.assertEqual(brightness.PERCENTS, (5, 15, 50, 100))


class TestUpdate(unittest.TestCase):

    def test_erste_aenderung_meldet_changed(self):
        c = BrightnessController()
        self.assertEqual(c.update(100), (0, 5, True))

    def test_gleicher_wert_keine_aenderung(self):
        c = BrightnessController()
        c.update(100)
        level, percent, changed = c.update(100)
        self.assertFalse(changed)
        self.assertEqual(percent, 5)

    def test_dunkel_zu_hell_erreicht_100(self):
        c = BrightnessController()
        c.update(100)
        level = percent = None
        for _ in range(brightness.AVERAGE_WINDOW + 2):
            level, percent, _ = c.update(4000)
        self.assertEqual(level, 3)
        self.assertEqual(percent, 100)

    def test_gleitender_mittelwert_fenster(self):
        c = BrightnessController()
        for _ in range(20):
            c.update(1000)
        self.assertLessEqual(len(c._buf), brightness.AVERAGE_WINDOW)


if __name__ == "__main__":
    unittest.main(verbosity=2)