#!/usr/bin/env python3
"""Dump one PocketBase collection's schema to a JSON file.

A safety net to run before any script that PATCHes a collection's field
list. Reads only — it never writes to PocketBase.

Credentials come from .env.local (or the environment):

    python3 scripts/pb-backup-collection.py SITES [outdir]
"""
import json
import sys
from datetime import datetime

from pb_env import http, superuser_token

COLLECTION = sys.argv[1] if len(sys.argv) > 1 else "SITES"
OUTDIR = sys.argv[2] if len(sys.argv) > 2 else "/tmp"

TOKEN = superuser_token()

code, coll = http("GET", f"/api/collections/{COLLECTION}", token=TOKEN)
if code != 200:
    sys.exit(f"could not read {COLLECTION}: {code} {coll}")

stamp = datetime.now().strftime("%Y%m%d-%H%M%S")
path = f"{OUTDIR}/{COLLECTION.lower()}-collection-{stamp}.json"
with open(path, "w") as f:
    json.dump(coll, f, indent=2)

print(f"  fields: {', '.join(f['name'] for f in coll.get('fields', []))}")
print(f"  ✓ backup written to {path}")