#!/usr/bin/env python
"""Download audio using youtube-dl, passing
   a specific set of options specified by the user.

=====
Usage
=====
>>> dlaudio -f flac -n <filename> "<url>"
"""

import argparse
import pathlib
import subprocess

if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-b', '--batch-dl',
                        dest='batchfile',
                        type=str,
                        help='provide the links from a text file')
    parser.add_argument('-f', '--format',
                        type=str,
                        default='flac',
                        help='the format to use')
    parser.add_argument('-n', '--filename',
                        type=str,
                        help='the name of the downloaded file (without extension)')
    parser.add_argument('urls',
                        nargs='*',
                        help='video URLs')
    args = parser.parse_args()

    default_filename = f"{pathlib.Path.home()}/Music/%(title)s.%(ext)s"

    dl_opts = []
    dl_opts.append('--no-part')
    dl_opts.append('--no-continue')
    dl_opts.append('--extract-audio')
    dl_opts.append(f"--audio-format={args.format}")

    dl_opts.append(f"--output={args.filename}")

    # filename handling
    # -b and -n should not be used together
    if args.filename and args.batchfile:
        print('Ignoring --batch-dl and --filename')
        dl_opts.append(f"--output={default_filename}")
    elif args.filename:
        dl_opts.append(f"--output={pathlib.Path.home()}/Music/{args.filename}.%(ext)s")
    else:
        dl_opts.append(f"--output={default_filename}")

    # URL handling
    if args.batchfile:
        dl_opts.append(f"--batch-file={args.batchfile}")
    elif len(args.urls) == 0:
        print("URLs are required")
        exit(2)
    else:
        dl_opts.extend(args.urls)

    dl = subprocess.run(['youtube-dl'] + dl_opts)