import random
import sys
import time

alphaBase = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz,. !="

def main():
    ### Argument validation ###
    if len(sys.argv) < 7:
        print("Usage: uv run main.py [0-58] [0-58] [0-58] '[message]' 'e|d' [int]")
        sys.exit(1)

    base_max = len(alphaBase)

    if not is_number(sys.argv[1]) or not is_number(sys.argv[2]) or not is_number(sys.argv[3]):
        print("Invalid seed value.")
        sys.exit(1)

    if not is_number(sys.argv[6]):
        print("Invalid iterations value.")
        sys.exit(1)

    if int(sys.argv[1]) == 0 or int(sys.argv[1]) > base_max:
        seed1 = random.randint(1, base_max)
    else:
        seed1 = int(sys.argv[1])

    if int(sys.argv[2]) == 0 or int(sys.argv[2]) > base_max:
        seed2 = random.randint(1, base_max)
    else:
        seed2 = int(sys.argv[2])

    if int(sys.argv[3]) == 0 or int(sys.argv[3]) > base_max:
        seed3 = random.randint(1, base_max)
    else:
        seed3 = int(sys.argv[3])

    if int(sys.argv[6]) < 0:
        iterations = 3
    else:
        iterations = int(sys.argv[6])

    ### Processing ###
    if sys.argv[5] == "e":
        for iteration in range(0, iterations):
            print("Iteration (not yet in use): ", iteration)


        # first iteration
        firstIterationResult = encode(seed1, sys.argv[4])
        print(firstIterationResult)
        
        secondIterationResult = encode(seed2, sys.argv[4])
        print(secondIterationResult)
        
        thirdIterationResult = encode(seed3, sys.argv[4])
        # print(thirdIterationResult)
        print("Seeds: ", seed1, seed2, seed3, thirdIterationResult)
    elif sys.argv[5] == "d":
        firstIterationResult = decode(seed1, sys.argv[4])
        print(firstIterationResult)

        secondIterationResult = decode(seed2, sys.argv[4])
        print(secondIterationResult)

        thirdIterationResult = decode(seed3, sys.argv[4])
        print(thirdIterationResult)
    else:
        print("Invalid option!")
        sys.exit(1)


def encode(offset, message):
    print("Encoding!")
    current_timestamp = time.time()
    print(current_timestamp)

    resultMessage = ""

    for indexA in range(len(message)):
        for indexB in range(len(alphaBase)):
            if message[indexA] == alphaBase[indexB]:
                location = indexB + offset
                if location > (len(alphaBase) - 1):
                    location = location - (len(alphaBase) - 1)
                resultMessage = resultMessage + alphaBase[location]
                break

    return resultMessage


def decode(offset, message):
    print("Decoding!")

    resultMessage = ""

    for indexA in range(len(message)):
        for indexB in range(len(alphaBase)):
            if message[indexA] == alphaBase[indexB]:
                location = indexB - offset
                if location < 0:
                    location = location + (len(alphaBase) - 1)
                resultMessage = resultMessage + alphaBase[location]
                break

    return resultMessage


def is_number(i):
    try:
        int(i)
        return True
    except ValueError:
        return False


if __name__ == "__main__":
    main()