"""Converte i file .txt di output CHI660C (voltammetria ciclica) in CSV europeo.

Rimuove i metadati iniziali e la sezione "Results" e mantiene solo le due
colonne dati (Potential/V, Current/A), scritte con separatore ';' e
virgola come separatore decimale.
"""

import csv
import sys
from pathlib import Path

DATA_HEADER = "Potential/V, Current/A"


def convert_file(input_path: Path, output_path: Path) -> None:
    with input_path.open("r", encoding="utf-8", errors="replace") as f:
        lines = f.readlines()

    try:
        header_idx = next(i for i, line in enumerate(lines) if line.strip() == DATA_HEADER)
    except StopIteration:
        raise ValueError(f"Intestazione dati '{DATA_HEADER}' non trovata in {input_path}")

    rows = []
    for line in lines[header_idx + 1:]:
        line = line.strip()
        if not line:
            continue
        potential, current = (v.strip() for v in line.split(",", 1))
        rows.append((potential.replace(".", ","), current.replace(".", ",")))

    with output_path.open("w", encoding="utf-8", newline="") as f:
        writer = csv.writer(f, delimiter=";")
        writer.writerow(["Potential/V", "Current/A"])
        writer.writerows(rows)


def main(argv: list[str]) -> None:
    folder = Path(argv[1]) if len(argv) > 1 else Path(__file__).parent
    txt_files = sorted(folder.glob("*.txt"))

    if not txt_files:
        print(f"Nessun file .txt trovato in {folder}")
        return

    for txt_file in txt_files:
        csv_file = txt_file.with_suffix(".csv")
        try:
            convert_file(txt_file, csv_file)
            print(f"OK  {txt_file.name} -> {csv_file.name}")
        except ValueError as e:
            print(f"SKIP {txt_file.name}: {e}")


if __name__ == "__main__":
    main(sys.argv)