from __future__ import annotations

import logging
from pathlib import Path

log = logging.getLogger("xray-lists.dnsmasq")


def render_nftset_file(domain_to_targets: dict[str, list[str]]) -> str:
    lines = []
    for domain in sorted(domain_to_targets):
        targets = ",".join(domain_to_targets[domain])
        lines.append(f"nftset=/{domain}/{targets}")
    return "\n".join(lines) + ("\n" if lines else "")


def write_if_changed(path: Path, content: str, dry_run: bool = False) -> bool:
    old = path.read_text() if path.is_file() else None
    if old == content:
        log.debug("%s: unchanged", path)
        return False

    if dry_run:
        log.info("[dry-run] would write %s", path)
        return True

    path.parent.mkdir(parents=True, exist_ok=True)
    tmp = path.with_suffix(path.suffix + ".tmp")
    tmp.write_text(content)
    tmp.replace(path)
    log.info("wrote %s", path)
    return True