from __future__ import annotations

import logging
from pathlib import Path

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


def render_elements_file(elements: list[str]) -> str:
    if not elements:
        return "elements = { }\n"
    joined = ",\n    ".join(elements)
    return f"elements = {{\n    {joined}\n}}\n"


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