import numpy as np

PUs_states = [{"PU_MODE": "OFF","ploop_setpoint":0.0},{"PU_MODE": "OFF","ploop_setpoint":0.0},{"PU_MODE": "OFF","ploop_setpoint":0.0}] # data[i] is PU_i dictionnary

# Placeholder for CAN backend
class CANBackend:
    def __init__(self):
        self.connected = False

    def connect(self, node_id: int, eds_path: str) -> bool:
        # Placeholder for connection logic
        self.connected = True
        return True

    def shutdown(self):
        self.connected = False


    def read_current_state(self,pu_number: int):
        # Placeholder for reading mode command
        return PUs_states[pu_number-1]

    def send_thermal_loop_cleaning(self, mode: str):
        # Placeholder for thermal loop cleaning
        pass

    def send_state_command(self, state: str, pu_number : int, ploop_setpoint : float):
        # Placeholder for sending mode command
        PUs_states[pu_number-1] = {"PU_MODE": state, "ploop_setpoint":ploop_setpoint}


    def get_latest_data(self):
        # Placeholder for getting latest TPDO data
        return {"FM2" : round(1000*np.random.random(),1),"PS1" : round(10*np.random.random(),2)}