#!/usr/bin/env python3
"""
Show metadata for one file.

Drag a file onto this script, or run:
    python3 view_metadata.py path/to/file/or/directory [...]

If more than one file is provided or found, only the first file is shown.
"""

from __future__ import annotations

import subprocess
import sys
from pathlib import Path
from shutil import which


def first_file_from_path(path: Path) -> Path | None:
    path = path.expanduser()
    if path.is_file():
        return path.resolve()
    if path.is_dir():
        for child in sorted(path.rglob("*"), key=lambda item: str(item).lower()):
            if child.is_file():
                return child.resolve()
    return None


def choose_file(args: list[str]) -> Path | None:
    for arg in args:
        file_path = first_file_from_path(Path(arg))
        if file_path is not None:
            return file_path
    return None


def pause_if_interactive() -> None:
    if sys.stdin.isatty():
        try:
            input("\nPress Enter to close...")
        except EOFError:
            pass


def run(argv: list[str]) -> int:
    if len(argv) < 2:
        print("Usage: python3 view_metadata.py path/to/file/or/directory [...]")
        return 2

    exiftool = which("exiftool")
    if exiftool is None:
        print("exiftool was not found on PATH.")
        return 1

    file_path = choose_file(argv[1:])
    if file_path is None:
        print("No file found.")
        return 1

    print(f"Showing metadata for: {file_path}\n", flush=True)
    command = [
        exiftool,
        "-a",
        "-u",
        "-ee",
        "-G0:1",
        "-s",
        "-charset",
        "filename=UTF8",
        str(file_path),
    ]
    return subprocess.run(command).returncode


def main(argv: list[str]) -> int:
    try:
        return run(argv)
    finally:
        pause_if_interactive()


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