import pandas as pd
import time

def main():
    """
    Print out a sequence following the see-it sequence
    """

    upper_bound = 100
    seed = "1"
    file_location = "output.csv"

    df = pd.DataFrame(columns=["Iteration", "Length", "Value"])

    val = seed

    for i in range(0,upper_bound):
        #print(f"Iteration : {i}")
        #print(f"Length : {len(val)}")
        #print(val)
        df.loc[len(df)] = [i, len(val), val]
        start_time = time.time()
        val = next_step(val)
        elasped_time = time.time() - start_time
        print(f"Iteration : {i} of {upper_bound} (took {elasped_time:.4f} seconds)")
        df.to_csv(file_location, index=False)
        print("Progress saved to file")
        print("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=")

    print("Result logged to {file_location.csv}")


def next_step(sequence: str) -> str:
    last_char = None
    last_char_count = 0

    ret = ""

    for char in sequence:
        if last_char == None:
            last_char = char
            last_char_count = 1
        elif char == last_char:
            last_char_count += 1
        else:
            ret += str(last_char_count)
            ret += str(last_char)
            last_char_count = 1
            last_char = char

    if ret != None:
        ret += str(last_char_count)
        ret += str(last_char)


    return ret



if __name__ == "__main__":
    main()