#!/usr/bin/python3
# 

def waitMouseClick():
    print("wait mouse click")
    mouse = open( "/dev/input/mice", "rb" )
    down = False;
    while True:
        buf = mouse.read(3)
        if ((buf[0] & 0x1)==1):
            down = True
        if (((buf[0] & 0x1)==0) and down):        
            break;
    mouse.close()

def loop(state):
    print('loop ' +state)
    match state:
        case "START":
            waitMouseClick()
            return "STEP1"
        case "STEP1":
            waitMouseClick()
            return "STEP2"
        case "STEP2":
            waitMouseClick()
            return "STOP"
        case _:
            print("Unknwn state "+state)
            return "STOP"
    print("end loop")


if __name__ == "__main__":
    # The client code.

    state="START"
    while (state!="STOP"):
        state = loop(state)