import time
import random

LoadPinOfPcMux = machine.Pin(1, machine.Pin.OUT)
EnablePinOfPc = machine.Pin(0, machine.Pin.OUT)
ClockPc = machine.Pin(16, machine.Pin.OUT)

LoadPinOfPcMux.value(1)
EnablePinOfPc.value(1)

Muxinp1 = machine.Pin(2, machine.Pin.OUT)
Muxinp2 = machine.Pin(3, machine.Pin.OUT)
Muxinp3 = machine.Pin(4, machine.Pin.OUT)
Muxinp4 = machine.Pin(5, machine.Pin.OUT)

Muxinp1.value(1)
Muxinp2.value(1)
Muxinp3.value(1)
Muxinp4.value(1)

Muxinp1.value(0)
Muxinp2.value(0)
Muxinp3.value(0)
Muxinp4.value(0)

PcInputPin1 = machine.Pin(13, machine.Pin.IN)
PcInputPin2 = machine.Pin(12, machine.Pin.IN)
PcInputPin4 = machine.Pin(11, machine.Pin.IN)
PcInputPin8 = machine.Pin(10, machine.Pin.IN)

#bottom IR pins
bottomIRPin1= machine.Pin(18,machine.Pin.OUT)
bottomIRPin2= machine.Pin(19,machine.Pin.OUT)
bottomIRPin3= machine.Pin(20,machine.Pin.OUT)
bottomIRPin4= machine.Pin(21,machine.Pin.OUT)

#top IR pins
topIRpin1 = machine.Pin(22,machine.Pin.OUT)
topIRpin2 = machine.Pin(26,machine.Pin.OUT)
topIRpin3 = machine.Pin(27,machine.Pin.OUT)
topIRpin4 = machine.Pin(28,machine.Pin.OUT)

ClockIR= machine.Pin(17, machine.Pin.OUT)
loadIR= machine.Pin(14, machine.Pin.OUT)

opCodepin1= machine.Pin(8, machine.Pin.OUT)
opCodepin2= machine.Pin(9, machine.Pin.OUT)

accumulatorClock= machine.Pin(6, machine.Pin.OUT)
loadAccumulator = machine.Pin(7, machine.Pin.OUT)

#Memory simulation
Memory = [
    [1, 1, 1, 1],   #15
    [1, 1, 1, 0],   #14
    [1, 1, 0, 1],   #13
    [1, 1, 0, 0],   #12
    [1, 0, 1, 1],   #11
    [1, 0, 1, 0],   #10
    [1, 0, 0, 1],   #9
    [1, 0, 0, 0],   #8
    [0, 1, 1, 1],   #7
    [0, 1, 1, 0],   #6
    [0, 1, 0, 1],   #5
    [0, 1, 0, 0],   #4
    [0, 0, 1, 1],   #3
    [0, 0, 1, 0],   #2
    [0, 0, 0, 1],   #1
    [0, 0, 0, 0]    #0
]

#print ("Memory elements are as follows: ")
#for row in Memory:
 #   print(row)

ALUAddSubtract = machine.Pin(15, machine.Pin.OUT)
counter = 1
while True:
    ClockPc.value(0)
    time.sleep(2)
    ClockPc.value(1)
    time.sleep(2)

    PCpin1_val = PcInputPin1.value()
    PCpin2_val = PcInputPin2.value()
    PCpin4_val = PcInputPin4.value()
    PCpin8_val = PcInputPin8.value()
    loadIR.value(0)

    PC_dec = PCpin1_val*1 + PCpin2_val*2 + PCpin4_val*4 + PCpin8_val*8
    if (PC_dec % 4 == 1):
        print(f"starting LOOP {counter} ")
        opCodepin1.value(0)
        opCodepin2.value(1)
    if(PC_dec % 4 == 2):
        opCodepin1.value(1)
        opCodepin2.value(0)
    if (PC_dec % 4 == 3):
        addSubtract = random.randint(0, 1)
        if (addSubtract == 0):
            opCodepin1.value(1)
            opCodepin2.value(1)
        else: 
            opCodepin1.value(0)
            opCodepin2.value(0)
    if (PC_dec % 4 == 0):
        print("The final value has been saved in the accumulator")
        print(f"LOOP {counter} has been completed successfully. ")
        counter += 1
        continue

    opCodepin1_val= opCodepin1.value()
    opCodepin2_val= opCodepin2.value()

    if (opCodepin1_val==0 and opCodepin2_val==1):
        elements = Memory[PC_dec]
        var1, var2, var3, var4 = elements
        topIRpin1.value(var4)
        topIRpin2.value(var3)
        topIRpin3.value(var2)
        topIRpin4.value(var1)
        print ("OPCODE RECEIVED: 01 - data loaded into the top instruction register -")
        print (var1,var2,var3,var4)

    if (opCodepin1_val==1 and opCodepin2_val==0):
        elements = Memory[PC_dec]
        var1, var2, var3, var4 = elements
        bottomIRPin1.value(var4)
        bottomIRPin2.value(var3)
        bottomIRPin3.value(var2)
        bottomIRPin4.value(var1)
        print ("OPCODE RECEIVED: 10 - data loaded into the bottom instruction register -")
        print (var1,var2,var3,var4)

    # now if it is 11 we will do addition
    if (opCodepin1_val==1 and opCodepin2_val==1):
        ALUAddSubtract.value(0)
        print ("OPCODE RECEIVED: 11 - DATA IS BEING ADDED")
        loadIR.value(1)
        ClockIR.value(0)
        time.sleep(1)
        ClockIR.value(1)
        time.sleep(1)
        loadAccumulator.value(1)
        accumulatorClock.value(0)
        time.sleep(1)
        accumulatorClock.value(1)
        time.sleep(1)
        print ("Data has been added successfully. ")

    # now if it is 00 we will do subtraction
    if (opCodepin1_val==0 and opCodepin2_val==0):
        ALUAddSubtract.value(1)
        print ("OPCODE RECEIVED: 00 - DATA IS BEING SUBTRACTED")
        loadIR.value(1)
        ClockIR.value(0)
        time.sleep(1)
        ClockIR.value(1)
        time.sleep(1)
        loadAccumulator.value(1)
        accumulatorClock.value(0)
        time.sleep(1)
        accumulatorClock.value(1)
        time.sleep(1)
        print ("Data has been subtracted successfully. ")