#!/usr/bin/env python3
"""Render the production Service Registry ConfigMap from one canonical source."""

from __future__ import annotations

import argparse
import hashlib
from pathlib import Path


REPO_ROOT = Path(__file__).resolve().parents[2]
SOURCE = REPO_ROOT / "ops" / "config" / "service-registry.yaml"
TARGET = REPO_ROOT / "k8s" / "awoooi-prod" / "15-service-registry-configmap.yaml"


def render(source_text: str) -> str:
    if not source_text.endswith("\n"):
        source_text += "\n"
    digest = hashlib.sha256(source_text.encode("utf-8")).hexdigest()
    embedded = "".join(
        f"    {line}" if line.strip() else line
        for line in source_text.splitlines(keepends=True)
    )
    return (
        "# Generated by scripts/ops/render-service-registry-configmap.py.\n"
        "# Source: ops/config/service-registry.yaml; do not edit this file by hand.\n"
        "apiVersion: v1\n"
        "kind: ConfigMap\n"
        "metadata:\n"
        "  name: service-registry\n"
        "  namespace: awoooi-prod\n"
        "  labels:\n"
        "    app: awoooi\n"
        "    component: service-registry\n"
        "  annotations:\n"
        f"    awoooi.wooo.work/source-sha256: \"{digest}\"\n"
        "data:\n"
        "  service-registry.yaml: |\n"
        f"{embedded}"
    )


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "--check",
        action="store_true",
        help="fail if the committed ConfigMap is not an exact render",
    )
    args = parser.parse_args()

    expected = render(SOURCE.read_text(encoding="utf-8"))
    if args.check:
        actual = TARGET.read_text(encoding="utf-8") if TARGET.exists() else ""
        if actual != expected:
            raise SystemExit(
                "service registry ConfigMap drift: run "
                "scripts/ops/render-service-registry-configmap.py"
            )
        return 0

    TARGET.write_text(expected, encoding="utf-8")
    return 0


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