#!/usr/bin/env python3
"""Replace hardcoded `localhost` URLs in the imported XVI checkers with self.url().

Why: the imported checkers connect to `http://localhost:{self.port}`. The
receiver does run on the same host as the published team ports, so this happens
to work, but it is fragile (breaks the moment a receiver runs in a container or
the port is bound to a specific interface). Challenge.url() builds the URL from
self.host (default 127.0.0.1, overridable with RECEIVER_HOST) plus self.port.

Idempotent; rewrites only the f-string form, leaving class-level constants that
pin a *fixed* port (GemasNotes/Pasta/S3) alone — those are handled separately.
"""
import re
import sys
from pathlib import Path

BASE = Path("/opt/gemastik18-final/receiver/challenges/xvi")

# f"http://localhost:{self.port}/path/{expr}"  ->  self.url(f"/path/{expr}")
# The leading f is part of the literal being matched and must be consumed.
PAT = re.compile(
    r"""f?(?P<q>["'])http://localhost:\{self\.port\}(?P<path>/[^"']*)?(?P=q)"""
)


def repl(m: "re.Match[str]") -> str:
    path = m.group("path") or ""
    if not path:
        return "self.url()"
    # the path may itself contain {expr} placeholders — keep them as an f-string
    return f"self.url(f{path!r})"


def main() -> int:
    changed = []
    for p in sorted(BASE.glob("*.py")):
        if p.name in ("Challenge.py", "config.py", "__init__.py"):
            continue
        src = p.read_text()
        if "localhost:{self.port}" not in src:
            continue
        new = PAT.sub(repl, src)
        if new != src:
            p.write_text(new)
            changed.append(p.name)
    print("rewritten:", ", ".join(changed) if changed else "(none)")
    return 0


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