#!/usr/bin/env python3
"""Validate an admin content change-set JSON file.

The validator uses the same service-layer rules as the backend. It runs against
an empty in-memory repository by default, so references to existing production
content should be seeded by a deployment-specific wrapper before applying real
changes.
"""

from __future__ import annotations

import argparse
import json
from pathlib import Path
import sys

from fan_passport.admin_content import (
    AdminContentService,
    ContentValidationError,
    InMemoryContentRepository,
    load_change_set,
)


def build_parser() -> argparse.ArgumentParser:
    parser = argparse.ArgumentParser(description="Validate Fan Passport admin content change-set JSON.")
    parser.add_argument("change_set_path", type=Path, help="Path to a content change-set JSON document.")
    parser.add_argument(
        "--apply",
        action="store_true",
        help="Apply accepted changes to the local in-memory repository after validation.",
    )
    return parser


def main() -> int:
    args = build_parser().parse_args()
    repository = InMemoryContentRepository()
    service = AdminContentService(repository)

    try:
        change_set = load_change_set(args.change_set_path)
        if args.apply:
            result = service.apply(change_set)
            payload = result.to_dict()
        else:
            payload = service.plan(change_set).to_dict()
    except (OSError, json.JSONDecodeError, ContentValidationError, ValueError, KeyError) as exc:
        print(f"content change-set validation failed: {exc}", file=sys.stderr)
        return 1

    print(json.dumps(payload, indent=2, sort_keys=True))
    return 0 if payload.get("accepted", payload.get("plan", {}).get("accepted", False)) else 2


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