# import unittest
import sys
import time

import mock

import snapshottest

# Note: prepare globally mocked modules first and then load our module
MOCKED_SMBUS_MODULE = mock.Mock()
sys.modules['smbus'] = MOCKED_SMBUS_MODULE
time.sleep = lambda s: None
import veml6070  # pylint: disable=wrong-import-position


# inspired by https://github.com/adafruit/Adafruit_Python_GPIO/blob/master/Adafruit_GPIO/I2C.py
class MockSMBus(object): # pylint: disable=bad-option-value,useless-object-inheritance
    def __init__(self, initial_read=None):
        self._log = []
        self.initial_read = initial_read or {}

    def read_byte(self, addr):
        val = self.initial_read.get(addr).pop(0)
        self._log.append(('r', addr, val))
        return val

    def write_byte(self, addr, val):
        self._log.append(('w', addr, val))


# def create_veml6070(**kwargs):
#     mockbus = MockSMBus()
#     smbus = Mock()
#     smbus.SMBus.return_value = mockbus
#     with patch.dict('sys.modules', {'smbus': smbus}):
#         import veml6070
#         # Note: our module constants only available in this scope
#         return (veml6070.Veml6070(**kwargs), mockbus)


def setup_mockbus(**kwargs):
    mockbus = MockSMBus(**kwargs)
    MOCKED_SMBUS_MODULE.SMBus.return_value = mockbus
    return mockbus


# pylint: disable=protected-access
class TestVeml6070(snapshottest.TestCase):
    def test_setup(self):
        mockbus = setup_mockbus()
        veml = veml6070.Veml6070()
        MOCKED_SMBUS_MODULE.SMBus.assert_called_with(1)
        self.assertIsNotNone(veml)
        self.assertMatchSnapshot(mockbus._log)

    def test_integration_time(self):
        mockbus = setup_mockbus()
        veml = veml6070.Veml6070(integration_time=veml6070.INTEGRATIONTIME_1_2T)
        self.assertEqual(veml.get_integration_time(), veml6070.INTEGRATIONTIME_1_2T)
        veml.set_integration_time(veml6070.INTEGRATIONTIME_4T)
        self.assertEqual(veml.get_integration_time(), veml6070.INTEGRATIONTIME_4T)
        self.assertMatchSnapshot(mockbus._log)

    def test_enable(self):
        mockbus = setup_mockbus()
        veml = veml6070.Veml6070()
        veml.enable()
        self.assertMatchSnapshot(mockbus._log)

    def test_disable(self):
        mockbus = setup_mockbus()
        veml = veml6070.Veml6070()
        veml.disable()
        self.assertMatchSnapshot(mockbus._log)

    def test_uva_light_intensity_raw(self):
        mockbus = setup_mockbus(initial_read={0x38 + 1: [0x12], 0x38 + 0: [0x34]})
        veml = veml6070.Veml6070()
        self.assertEqual(veml.get_uva_light_intensity_raw(), 0x1234)
        self.assertMatchSnapshot(mockbus._log)

    def test_uva_light_intensity(self):
        mockbus = setup_mockbus(initial_read={0x38 + 1: [0x01, 0x01], 0x38 + 0: [0x06, 0x06]})
        veml = veml6070.Veml6070()
        self.assertEqual(veml.get_uva_light_intensity(), 0x0106 * (0.1 / 0.1125) * 0.05 / 1)
        veml.set_integration_time(veml6070.INTEGRATIONTIME_4T)
        self.assertEqual(veml.get_uva_light_intensity(), 0x0106 * (0.1 / 0.1125) * 0.05 / 4)
        self.assertMatchSnapshot(mockbus._log)

    def test_get_estimated_risk_level(self):
        mockbus = setup_mockbus(initial_read={0x38 + 1: [0x01, 0x04], 0x38 + 0: [0x06, 0x01]})  # pylint: disable=unused-variable
        veml = veml6070.Veml6070()
        intensity = veml.get_uva_light_intensity()
        self.assertEqual(veml.get_estimated_risk_level(intensity), "low")
        intensity = veml.get_uva_light_intensity()
        self.assertEqual(veml.get_estimated_risk_level(intensity), "moderate")
        # don't assert mockbus._log as we do not care

    def test_get_refresh_time(self):
        mockbus = setup_mockbus()  # pylint: disable=unused-variable
        veml = veml6070.Veml6070(rset=veml6070.RSET_240K)
        self.assertEqual(veml.get_refresh_time(), 0.1)
        veml.set_integration_time(veml6070.INTEGRATIONTIME_1_2T)
        self.assertEqual(veml.get_refresh_time(), 0.05)
        veml2 = veml6070.Veml6070(rset=veml6070.RSET_270K)
        self.assertEqual(veml2.get_refresh_time(), 0.1125)
        veml3 = veml6070.Veml6070(rset=veml6070.RSET_600K)
        veml3.set_integration_time(veml6070.INTEGRATIONTIME_2T)
        self.assertEqual(veml3.get_refresh_time(), 0.5)
        veml4 = veml6070.Veml6070(rset=480000)
        self.assertEqual(veml4.get_refresh_time(), 0.2)
        # don't assert mockbus._log as we do not care