"""CLI: python -m web_fetcher fetch SPECS.json [--cache DIR | --replay DIR] [--out FILE]

SPECS.json is a JSON list of spec objects (or {"specs": [...]}). Output is
JSON Lines, one Observation per line. --replay serves every URL from a cache
written by an earlier --cache run, without network access.
"""

from __future__ import annotations

import argparse
import json
import sys

from web_fetcher.registry import run_specs


def main(argv: list[str] | None = None) -> int:
    ap = argparse.ArgumentParser(prog="web_fetcher")
    sub = ap.add_subparsers(dest="cmd", required=True)
    f = sub.add_parser("fetch", help="run fetch specs")
    f.add_argument("specs")
    src = f.add_mutually_exclusive_group()
    src.add_argument("--cache", default=None, help="content-addressed cache directory")
    src.add_argument("--replay", default=None, help="replay from a cache directory; no network")
    f.add_argument("--out", default="-", help="output JSONL path (default stdout)")
    f.add_argument("--only", action="append", default=[], help="run only these spec ids")
    args = ap.parse_args(argv)
    with open(args.specs, encoding="utf-8") as fh:
        data = json.load(fh)
    specs = data["specs"] if isinstance(data, dict) else data
    if args.only:
        specs = [s for s in specs if s.get("id") in set(args.only)]
    obs = run_specs(specs, cache_dir=args.cache, replay_dir=args.replay)
    lines = "\n".join(o.to_json() for o in obs) + "\n"
    if args.out == "-":
        sys.stdout.write(lines)
    else:
        with open(args.out, "w", encoding="utf-8") as fh:
            fh.write(lines)
    return 0 if all(o.status != "error" for o in obs) else 1


if __name__ == "__main__":
    raise SystemExit(main())