import json
from sys import argv, exit
from os import path
from dataclasses import dataclass


@dataclass(frozen=True)
class Location:
    row: int
    col: int


def main():
    input_file = argv[1]
    output_file = argv[2]
    alternate_mode = len(argv) == 4 and argv[3] == "alt"

    if not test_file(input_file):
        print("Input file does not exist")
        exit(1)
    if test_file(output_file):
        print("Output file already exists")
        exit(1)

    locations = read_input_csv_to_wells(input_file)
    json_obj = tubes_to_tubes_json(locations)

    if alternate_mode:
        with open(output_file, 'w') as file:
            for location in locations:
                index = (location.row - 1) * 12 + location.col
                file.write(f"{index}\n")
        exit(0)

    with open(output_file, 'w') as file:
        json.dump(json_obj, file)


def read_input_csv_to_wells(p: str) -> [Location]:
    with open(p, 'r') as file:
        lines=file.readlines()
    # Assume 96w format only
    def get_first_col(line): return line.split(',')[0]
    def get_row(x): return ord(x.upper()) - 64

    def get_row_col(line: str) -> Location:
        col=get_first_col(line)[1:]
        row=get_row(get_first_col(line)[0])
        return Location(row, int(col))

    return list(set([get_row_col(line) for line in lines[1:]]))


def tubes_to_tubes_json(i: [Location]) -> dict:
    target_positions_list=[]

    for tube in i:
        target_positions_list.append((tube.row - 1) * 12
                                     + tube.col)

    output_obj={}
    output_obj["TargetPositions"]=[{"PositionIndex": p}
                                     for p in target_positions_list]

    return output_obj


def test_file(p: str) -> bool:
    return path.exists(p) and path.isfile(p)


if __name__ == "__main__":
    main()