#!/usr/bin/env python3
import argparse
import csv
import subprocess
import sys
from pathlib import Path
from typing import Dict

from tqdm import tqdm


def run(cmd: list[str]) -> int:
	"""Run a command and stream output; return exit code."""
	proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True)
	assert proc.stdout is not None
	for line in proc.stdout:
		sys.stdout.write(line)
	return proc.wait()


def sanitize(stem: str) -> str:
	return "".join(ch if ch.isalnum() or ch in "-_." else "_" for ch in stem)


def main() -> None:
	parser = argparse.ArgumentParser(description="Download audio with yt-dlp from a catalog CSV into category subfolders.")
	parser.add_argument("--catalog", required=True, help="Path to sources.csv")
	parser.add_argument("--outdir", required=True, help="Output root (e.g., audio)")
	parser.add_argument("--format", default="bestaudio/best", help="yt-dlp format selector")
	parser.add_argument("--rate-limit", default=None, help="Rate limit (e.g., 1M)")
	parser.add_argument("--dry-run", action="store_true", help="Print commands only")
	args = parser.parse_args()

	outroot = Path(args.outdir)
	outroot.mkdir(parents=True, exist_ok=True)

	with open(args.catalog, newline="", encoding="utf-8") as f:
		reader = csv.DictReader(f)
		rows = [r for r in reader if r.get("url") and not r["url"].startswith("#")]

	for row in tqdm(rows, desc="Downloading"):
		url = row["url"].strip()
		category = (row.get("category") or "misc").strip()
		license_name = (row.get("license") or "").strip().lower()
		license_url = (row.get("license_url") or "").strip()
		# Hard gate: skip non-permissive/unknown licenses unless user confirms upstream.
		if not license_name or all(k not in license_name for k in ("cc-by", "cc by", "cc-by-sa", "etalab", "public-domain", "public domain")):
			print(f"SKIP (license not permissive/unspecified): {url} -> {license_name}")
			continue

		target_dir = outroot / category
		target_dir.mkdir(parents=True, exist_ok=True)
		# Let yt-dlp set name; we will normalize later.
		out_tpl = str(target_dir / "%(uploader)s-%(title)s-%(id)s.%(ext)s")
		cmd = [
			"yt-dlp",
			"-f", args.format,
			"-x", "--audio-format", "wav",
			"--audio-quality", "0",
			"--no-playlist",
			"--restrict-filenames",
			"-o", out_tpl,
			url,
		]
		if args.rate_limit:
			cmd.extend(["--limit-rate", args.rate_limit])
		if args.dry_run:
			print(" ".join(cmd))
			continue
		code = run(cmd)
		if code != 0:
			print(f"Download failed with code {code} for {url}", file=sys.stderr)


if __name__ == "__main__":
	main()