import random
import numpy as np
import json

from cereal import messaging
from openpilot.selfdrive.locationd.paramsd import retrieve_initial_vehicle_params, migrate_cached_vehicle_params_if_needed
from openpilot.selfdrive.locationd.models.car_kf import CarKalman
from openpilot.selfdrive.locationd.test.test_locationd_scenarios import TEST_ROUTE
from openpilot.selfdrive.test.process_replay.migration import migrate, migrate_carParams
from openpilot.common.params import Params
from openpilot.tools.lib.logreader import LogReader


def get_random_live_parameters(CP):
  msg = messaging.new_message("liveParameters")
  msg.liveParameters.steerRatio = (random.random() + 0.5) * CP.steerRatio
  msg.liveParameters.stiffnessFactor = random.random()
  msg.liveParameters.angleOffsetAverageDeg = random.random()
  msg.liveParameters.debugFilterState.std = [random.random() for _ in range(CarKalman.P_initial.shape[0])]
  return msg


class TestParamsd:
  def test_read_saved_params(self):
    params = Params()

    lr = migrate(LogReader(TEST_ROUTE), [migrate_carParams])
    CP = next(m for m in lr if m.which() == "carParams").carParams

    msg = get_random_live_parameters(CP)
    params.put("LiveParametersV2", msg.to_bytes())
    params.put("CarParamsPrevRoute", CP.as_builder().to_bytes())

    migrate_cached_vehicle_params_if_needed(params) # this is not tested here but should not mess anything up or throw an error
    sr, sf, offset, p_init = retrieve_initial_vehicle_params(params, CP, replay=True, debug=True)
    np.testing.assert_allclose(sr, msg.liveParameters.steerRatio)
    np.testing.assert_allclose(sf, msg.liveParameters.stiffnessFactor)
    np.testing.assert_allclose(offset, msg.liveParameters.angleOffsetAverageDeg)
    np.testing.assert_equal(p_init.shape, CarKalman.P_initial.shape)
    np.testing.assert_allclose(np.diagonal(p_init), msg.liveParameters.debugFilterState.std)

  # TODO Remove this test after the support for old format is removed
  def test_read_saved_params_old_format(self):
    params = Params()

    lr = migrate(LogReader(TEST_ROUTE), [migrate_carParams])
    CP = next(m for m in lr if m.which() == "carParams").carParams

    msg = get_random_live_parameters(CP)
    params.put("LiveParameters", json.dumps(msg.liveParameters.to_dict()))
    params.put("CarParamsPrevRoute", CP.as_builder().to_bytes())
    params.remove("LiveParametersV2")

    migrate_cached_vehicle_params_if_needed(params)
    sr, sf, offset, _ = retrieve_initial_vehicle_params(params, CP, replay=True, debug=True)
    np.testing.assert_allclose(sr, msg.liveParameters.steerRatio)
    np.testing.assert_allclose(sf, msg.liveParameters.stiffnessFactor)
    np.testing.assert_allclose(offset, msg.liveParameters.angleOffsetAverageDeg)
    assert params.get("LiveParametersV2") is not None

  def test_read_saved_params_corrupted_old_format(self):
    params = Params()
    params.put("LiveParameters", b'\x00\x00\x02\x00\x01\x00:F\xde\xed\xae;')
    params.remove("LiveParametersV2")

    migrate_cached_vehicle_params_if_needed(params)
    assert params.get("LiveParameters") is None
    assert params.get("LiveParametersV2") is None