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


@dataclass
class Tube:
    barcode: str
    row: int
    col: int


def main():
    input_file = argv[1]
    output_file = argv[2]

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

    tubes = read_and_parse_ziath_json(input_file)
    json_obj = tubes_to_tubes_json(tubes)

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


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


def read_and_parse_ziath_json(p: str) -> [Tube]:
    with open(p, 'r') as file:
        j = json.load(file)

    ziath_tubes = j["tubeBarcode"]
    return [Tube(tube["barcode"], tube["row"], tube["column"])
            for tube in ziath_tubes]


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

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

    output_obj = {}
    output_obj["Items"] = [{"BarcodeValue": b}
                           for b in items_list]
    output_obj["TargetPositions"] = [{"PositionIndex": p}
                                     for p in target_positions_list]

    return output_obj


if __name__ == "__main__":
    main()