from cereal import car
from common.numpy_fast import mean
from selfdrive.config import Conversions as CV
from opendbc.can.can_define import CANDefine
from opendbc.can.parser import CANParser
from selfdrive.car.interfaces import CarStateBase
from selfdrive.car.gm.values import DBC, CAR, AccState, CanBus, \
                                    CruiseButtons, is_eps_status_ok, \
                                    STEER_THRESHOLD


class CarState(CarStateBase):
  def __init__(self, CP):
    super().__init__(CP)
    can_define = CANDefine(DBC[CP.carFingerprint]['pt'])
    self.shifter_values = can_define.dv["ECMPRDNL"]["PRNDL"]

  def update(self, pt_cp):
    ret = car.CarState.new_message()

    self.prev_cruise_buttons = self.cruise_buttons
    self.cruise_buttons = pt_cp.vl["ASCMSteeringButton"]['ACCButtons']

    ret.wheelSpeeds.fl = pt_cp.vl["EBCMWheelSpdFront"]['FLWheelSpd'] * CV.KPH_TO_MS
    ret.wheelSpeeds.fr = pt_cp.vl["EBCMWheelSpdFront"]['FRWheelSpd'] * CV.KPH_TO_MS
    ret.wheelSpeeds.rl = pt_cp.vl["EBCMWheelSpdRear"]['RLWheelSpd'] * CV.KPH_TO_MS
    ret.wheelSpeeds.rr = pt_cp.vl["EBCMWheelSpdRear"]['RRWheelSpd'] * CV.KPH_TO_MS
    ret.vEgoRaw = mean([ret.wheelSpeeds.fl, ret.wheelSpeeds.fr, ret.wheelSpeeds.rl, ret.wheelSpeeds.rr])
    ret.vEgo, ret.aEgo = self.update_speed_kf(ret.vEgoRaw)
    ret.standstill = ret.vEgoRaw < 0.01

    ret.steeringAngle = pt_cp.vl["PSCMSteeringAngle"]['SteeringWheelAngle']
    ret.gearShifter = self.parse_gear_shifter(self.shifter_values.get(pt_cp.vl["ECMPRDNL"]['PRNDL'], None))
    ret.brake = pt_cp.vl["EBCMBrakePedalPosition"]['BrakePedalPosition'] / 0xd0
    # Brake pedal's potentiometer returns near-zero reading even when pedal is not pressed.
    if ret.brake < 10/0xd0:
      ret.brake = 0.

    ret.gas = pt_cp.vl["AcceleratorPedal"]['AcceleratorPedal'] / 254.
    ret.gasPressed = ret.gas > 1e-5

    ret.steeringTorque = pt_cp.vl["PSCMStatus"]['LKADriverAppldTrq']
    ret.steeringPressed = abs(ret.steeringTorque) > STEER_THRESHOLD

    # 1 - open, 0 - closed
    ret.doorOpen = (pt_cp.vl["BCMDoorBeltStatus"]['FrontLeftDoor'] == 1 or
                    pt_cp.vl["BCMDoorBeltStatus"]['FrontRightDoor'] == 1 or
                    pt_cp.vl["BCMDoorBeltStatus"]['RearLeftDoor'] == 1 or
                    pt_cp.vl["BCMDoorBeltStatus"]['RearRightDoor'] == 1)

    # 1 - latched
    ret.seatbeltUnlatched = pt_cp.vl["BCMDoorBeltStatus"]['LeftSeatBelt'] == 0
    ret.leftBlinker = pt_cp.vl["BCMTurnSignals"]['TurnSignals'] == 1
    ret.rightBlinker = pt_cp.vl["BCMTurnSignals"]['TurnSignals'] == 2

    self.park_brake = pt_cp.vl["EPBStatus"]['EPBClosed']
    ret.cruiseState.available = bool(pt_cp.vl["ECMEngineStatus"]['CruiseMainOn'])
    ret.espDisabled = pt_cp.vl["ESPStatus"]['TractionControlOn'] != 1
    self.pcm_acc_status = pt_cp.vl["AcceleratorPedal2"]['CruiseState']

    regen_pressed = False
    if self.car_fingerprint == CAR.VOLT:
      regen_pressed = bool(pt_cp.vl["EBCMRegenPaddle"]['RegenPaddle'])

    # Regen braking is braking
    ret.brakePressed = ret.brake > 1e-5 or regen_pressed
    ret.cruiseState.enabled = self.pcm_acc_status != AccState.OFF
    ret.cruiseState.standstill = self.pcm_acc_status == AccState.STANDSTILL

    # 0 - inactive, 1 - active, 2 - temporary limited, 3 - failed
    self.lkas_status = pt_cp.vl["PSCMStatus"]['LKATorqueDeliveredStatus']
    ret.steerWarning = not is_eps_status_ok(self.lkas_status, self.car_fingerprint)

    return ret

  @staticmethod
  def get_can_parser(CP):
    # this function generates lists for signal, messages and initial values
    signals = [
      # sig_name, sig_address, default
      ("BrakePedalPosition", "EBCMBrakePedalPosition", 0),
      ("FrontLeftDoor", "BCMDoorBeltStatus", 0),
      ("FrontRightDoor", "BCMDoorBeltStatus", 0),
      ("RearLeftDoor", "BCMDoorBeltStatus", 0),
      ("RearRightDoor", "BCMDoorBeltStatus", 0),
      ("LeftSeatBelt", "BCMDoorBeltStatus", 0),
      ("RightSeatBelt", "BCMDoorBeltStatus", 0),
      ("TurnSignals", "BCMTurnSignals", 0),
      ("AcceleratorPedal", "AcceleratorPedal", 0),
      ("CruiseState", "AcceleratorPedal2", 0),
      ("ACCButtons", "ASCMSteeringButton", CruiseButtons.UNPRESS),
      ("SteeringWheelAngle", "PSCMSteeringAngle", 0),
      ("FLWheelSpd", "EBCMWheelSpdFront", 0),
      ("FRWheelSpd", "EBCMWheelSpdFront", 0),
      ("RLWheelSpd", "EBCMWheelSpdRear", 0),
      ("RRWheelSpd", "EBCMWheelSpdRear", 0),
      ("PRNDL", "ECMPRDNL", 0),
      ("LKADriverAppldTrq", "PSCMStatus", 0),
      ("LKATorqueDeliveredStatus", "PSCMStatus", 0),
      ("TractionControlOn", "ESPStatus", 0),
      ("EPBClosed", "EPBStatus", 0),
      ("CruiseMainOn", "ECMEngineStatus", 0),
    ]

    if CP.carFingerprint == CAR.VOLT:
      signals += [
        ("RegenPaddle", "EBCMRegenPaddle", 0),
      ]

    return CANParser(DBC[CP.carFingerprint]['pt'], signals, [], CanBus.POWERTRAIN)