#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Convert PDF to Microsoft Word (.docx).

Uses the pdf2docx library (layout-aware; works best on text-based PDFs).
Scanned PDFs may come through mostly as images inside the Word file.

  pip install pdf2docx

Usage:
  python pdf_to_word.py report.pdf
  python pdf_to_word.py report.pdf -o out.docx
  python pdf_to_word.py *.pdf
"""

from __future__ import annotations

import argparse
import sys
from pathlib import Path


def convert_one(pdf_path: Path, output_path: Path | None) -> Path:
    pdf_path = pdf_path.resolve()
    if not pdf_path.is_file():
        raise FileNotFoundError(pdf_path)

    if output_path is None:
        out = pdf_path.with_suffix(".docx")
    else:
        out = output_path.resolve()
        if out.suffix.lower() != ".docx":
            out = out.with_suffix(".docx")

    try:
        from pdf2docx import Converter
    except ImportError as e:
        raise SystemExit(
            "Missing dependency. Run: pip install pdf2docx\n" + str(e)
        ) from e

    print(f"Converting: {pdf_path.name} -> {out.name}")
    cv = Converter(str(pdf_path))
    try:
        cv.convert(str(out))
    finally:
        cv.close()
    print(f"  OK: {out}")
    return out


def main() -> None:
    ap = argparse.ArgumentParser(
        description="Convert PDF file(s) to Word (.docx).",
    )
    ap.add_argument(
        "pdf",
        nargs="+",
        type=Path,
        help="Input PDF file(s)",
    )
    ap.add_argument(
        "-o",
        "--output",
        type=Path,
        default=None,
        help="Output .docx (only when converting a single input PDF)",
    )
    args = ap.parse_args()

    inputs = args.pdf
    if len(inputs) > 1 and args.output is not None:
        print("ERROR: -o / --output can only be used with a single PDF.", file=sys.stderr)
        sys.exit(2)

    for pdf in inputs:
        try:
            # Only pass explicit output for the single-file case
            out = args.output if len(inputs) == 1 else None
            convert_one(pdf, out)
        except FileNotFoundError as e:
            print(f"ERROR: {e}", file=sys.stderr)
            sys.exit(1)
        except Exception as e:
            print(f"ERROR ({pdf}): {e}", file=sys.stderr)
            sys.exit(1)

    print("Done.")


if __name__ == "__main__":
    main()