import os
import math
import hypothesis.strategies as st
import pytest
from hypothesis import Phase, given, settings
from collections.abc import Callable
from typing import Any

from opendbc.car import DT_CTRL, CanData, gen_empty_fingerprint, structs
from opendbc.car.car_helpers import interfaces
from opendbc.car.fingerprints import FW_VERSIONS
from opendbc.car.fw_versions import FW_QUERY_CONFIGS
from opendbc.car.interfaces import get_interface_attr
from opendbc.car.mock.values import CAR as MOCK
from opendbc.car.values import PLATFORMS

DrawType = Callable[[st.SearchStrategy], Any]

ALL_ECUS = {ecu for ecus in FW_VERSIONS.values() for ecu in ecus.keys()}
ALL_ECUS |= {ecu for config in FW_QUERY_CONFIGS.values() for ecu in config.extra_ecus}

ALL_REQUESTS = {tuple(r.request) for config in FW_QUERY_CONFIGS.values() for r in config.requests}

MAX_EXAMPLES = int(os.environ.get('MAX_EXAMPLES', '15'))


def get_fuzzy_car_interface_args(draw: DrawType) -> dict:
  # Fuzzy CAN fingerprints and FW versions to test more states of the CarInterface
  fingerprint_strategy = st.fixed_dictionaries({key: st.dictionaries(st.integers(min_value=0, max_value=0x800),
                                                                     st.integers(min_value=0, max_value=64)) for key in
                                                gen_empty_fingerprint()})

  # only pick from possible ecus to reduce search space
  car_fw_strategy = st.lists(st.sampled_from(sorted(ALL_ECUS)))

  params_strategy = st.fixed_dictionaries({
    'fingerprints': fingerprint_strategy,
    'car_fw': car_fw_strategy,
    'alpha_long': st.booleans(),
  })

  params: dict = draw(params_strategy)
  params['car_fw'] = [structs.CarParams.CarFw(ecu=fw[0], address=fw[1], subAddress=fw[2] or 0,
                                              request=draw(st.sampled_from(sorted(ALL_REQUESTS))))
                      for fw in params['car_fw']]
  return params


class TestCarInterfaces:
  # FIXME: Due to the lists used in carParams, Phase.target is very slow and will cause
  #  many generated examples to overrun when max_examples > ~20, don't use it
  @pytest.mark.parametrize("car_name", sorted(PLATFORMS))
  @settings(max_examples=MAX_EXAMPLES, deadline=None,
            phases=(Phase.reuse, Phase.generate, Phase.shrink))
  @given(data=st.data())
  def test_car_interfaces(self, car_name, data):
    CarInterface = interfaces[car_name]

    args = get_fuzzy_car_interface_args(data.draw)

    car_params = CarInterface.get_params(car_name, args['fingerprints'], args['car_fw'],
                                         alpha_long=args['alpha_long'], docs=False)
    car_interface = CarInterface(car_params)
    assert car_params
    assert car_interface

    assert car_params.mass > 1
    assert car_params.wheelbase > 0
    # centerToFront is center of gravity to front wheels, assert a reasonable range
    assert car_params.wheelbase * 0.3 < car_params.centerToFront < car_params.wheelbase * 0.7
    assert car_params.maxLateralAccel > 0

    # Longitudinal sanity checks
    assert len(car_params.longitudinalTuning.kpV) == len(car_params.longitudinalTuning.kpBP)
    assert len(car_params.longitudinalTuning.kiV) == len(car_params.longitudinalTuning.kiBP)

    # Lateral sanity checks
    if car_params.steerControlType != structs.CarParams.SteerControlType.angle:
      tune = car_params.lateralTuning
      if tune.which() == 'pid':
        if car_name != MOCK.MOCK:
          assert not math.isnan(tune.pid.kf) and tune.pid.kf > 0
          assert len(tune.pid.kpV) > 0 and len(tune.pid.kpV) == len(tune.pid.kpBP)
          assert len(tune.pid.kiV) > 0 and len(tune.pid.kiV) == len(tune.pid.kiBP)

      elif tune.which() == 'torque':
        assert not math.isnan(tune.torque.kf) and tune.torque.kf > 0
        assert not math.isnan(tune.torque.friction) and tune.torque.friction > 0

    # Run car interface
    # TODO: use hypothesis to generate random messages
    now_nanos = 0
    CC = structs.CarControl().as_reader()
    for _ in range(10):
      car_interface.update([])
      car_interface.apply(CC, now_nanos)
      now_nanos += DT_CTRL * 1e9  # 10 ms

    CC = structs.CarControl()
    CC.enabled = True
    CC.latActive = True
    CC.longActive = True
    CC = CC.as_reader()
    for _ in range(10):
      car_interface.update([])
      car_interface.apply(CC, now_nanos)
      now_nanos += DT_CTRL * 1e9  # 10ms

    # Test radar interface
    radar_interface = CarInterface.RadarInterface(car_params)
    assert radar_interface

    # Run radar interface once
    radar_interface.update([])
    if not car_params.radarUnavailable and radar_interface.rcp is not None and \
       hasattr(radar_interface, '_update') and hasattr(radar_interface, 'trigger_msg'):
      radar_interface._update([radar_interface.trigger_msg])

    # Test radar fault
    if not car_params.radarUnavailable and radar_interface.rcp is not None:
      cans = [(0, [CanData(0, b'', 0) for _ in range(5)])]
      rr = radar_interface.update(cans)
      assert rr is None or len(rr.errors) > 0

  def test_interface_attrs(self):
    """Asserts basic behavior of interface attribute getter"""
    num_brands = len(get_interface_attr('CAR'))
    assert num_brands >= 12

    # Should return value for all brands when not combining, even if attribute doesn't exist
    ret = get_interface_attr('FAKE_ATTR')
    assert len(ret) == num_brands

    # Make sure we can combine dicts
    ret = get_interface_attr('DBC', combine_brands=True)
    assert len(ret) >= 160

    # We don't support combining non-dicts
    ret = get_interface_attr('CAR', combine_brands=True)
    assert len(ret) == 0

    # If brand has None value, it shouldn't return when ignore_none=True is specified
    none_brands = {b for b, v in get_interface_attr('FINGERPRINTS').items() if v is None}
    assert len(none_brands) >= 1

    ret = get_interface_attr('FINGERPRINTS', ignore_none=True)
    none_brands_in_ret = none_brands.intersection(ret)
    assert len(none_brands_in_ret) == 0, f'Brands with None values in ignore_none=True result: {none_brands_in_ret}'