import sys
import os

def CommandPrompt() : 
    os.system('clear')
    sys.stdout.write('Enter a command: \n')
    sys.stdout.write('1: write\n')
    sys.stdout.write('2: read\n')
    sys.stdout.write('3: wait an interrupt\n')
    MyString ="9: change base address["+hex(BaseAddress)+"]\n" 
    sys.stdout.write(MyString)
    sys.stdout.write('d: DUMP THE SIMULATION\n') 
    sys.stdout.write('e: exit\n\n')
    sys.stdout.write('> ')
    Command=sys.stdin.readline().strip('\n')   
    return Command

def BuildAddress (BaseAddress, RequestString) :
    sys.stdout.write(RequestString)
    return hex(BaseAddress + int(sys.stdin.readline().strip('\n'), 16)).lstrip('0x')

def SendCommand(CommandString) :
    fd_Out=open('../simulation/Py2V.fifo', 'w')
    fd_Out.write(CommandString)
    fd_Out.close() 

def ReadResult():
    fd_In=open('../simulation/V2Py.fifo', 'r')
    ResultString = fd_In.read()
    fd_In.close()
    return ResultString
    

Command=' '
BaseAddress=0

Command = CommandPrompt()                                   
while (Command!='e'):
    if Command=='d' :
        MyString =  'D\n'
        SendCommand(MyString)     
    elif Command=='1' :
        Address =BuildAddress(BaseAddress, 'Where do you want to write? 0x')
        sys.stdout.write('What do you want to write? ')
        Value =sys.stdin.readline().strip('\n') 
        MyString = 'W '+Address+' '+Value+'\n'
        SendCommand(MyString)
        print ReadResult()
        sys.stdin.readline()    
    elif Command=='2' :
        Address =BuildAddress(BaseAddress,'Where do you want to read? 0x' )
        MyString = 'R '+Address+'\n'
        SendCommand(MyString)
        print ReadResult()
        sys.stdin.readline()   
    elif Command=='3' :
        MyString = 'I \n'
        SendCommand(MyString)      
        print ReadResult()
        sys.stdin.readline()    
    elif Command=='9' :
        sys.stdout.write('What\'s the new base address? 0x')
        BaseAddress =int(sys.stdin.readline().strip('\n'), 16)
    Command = CommandPrompt()    
MyString =  'S\n'
SendCommand(MyString)