#!/usr/bin/env bash
set -euo pipefail

CONTAINER="geointel"
BACKUP_DIR=""

usage() {
  cat <<'EOF'
Usage: bash scripts/verify_release_backup.sh --backup-dir PATH [--container NAME]

Verifies checksums, manifest shape and PostgreSQL archive readability. This
command is read-only and never creates, restores or drops a database.
EOF
}

while [ "$#" -gt 0 ]; do
  case "$1" in
    --backup-dir) BACKUP_DIR="$2"; shift 2 ;;
    --container) CONTAINER="$2"; shift 2 ;;
    --help|-h) usage; exit 0 ;;
    *) echo "Unknown argument: $1" >&2; usage >&2; exit 2 ;;
  esac
done

if [ -z "$BACKUP_DIR" ]; then
  usage >&2
  exit 2
fi
for required in docker python3 sha256sum; do
  command -v "$required" >/dev/null 2>&1 || {
    echo "Missing required command: $required" >&2
    exit 2
  }
done
BACKUP_DIR="$(python3 -c 'import pathlib,sys; print(pathlib.Path(sys.argv[1]).expanduser().resolve())' "$BACKUP_DIR")"
for required_file in manifest.json database.dump database.list database-metadata.tsv table-counts.tsv CHECKSUMS.sha256; do
  test -s "$BACKUP_DIR/$required_file" || {
    echo "Missing or empty backup artifact: $required_file" >&2
    exit 3
  }
done

(
  cd "$BACKUP_DIR"
  sha256sum -c CHECKSUMS.sha256
)

python3 - "$BACKUP_DIR/manifest.json" <<'PY'
import json
import pathlib
import sys

payload = json.loads(pathlib.Path(sys.argv[1]).read_text(encoding="utf-8"))
required = {
    "schema_version",
    "release_id",
    "created_at",
    "read_only_source",
    "database_name",
    "database_user",
    "image_id",
    "git_commit",
}
missing = sorted(required - payload.keys())
if missing:
    raise SystemExit(f"Backup manifest misses: {', '.join(missing)}")
if payload["schema_version"] != 1 or payload["read_only_source"] is not True:
    raise SystemExit("Unsupported or unsafe backup manifest")
PY

if [ "$(docker inspect -f '{{.State.Running}}' "$CONTAINER" 2>/dev/null || true)" != "true" ]; then
  echo "Container '$CONTAINER' is required to run pg_restore --list." >&2
  exit 3
fi
TMP_LIST="$(mktemp)"
trap 'rm -f -- "$TMP_LIST"' EXIT
docker exec -i "$CONTAINER" pg_restore --list \
  < "$BACKUP_DIR/database.dump" \
  > "$TMP_LIST"
cmp -s "$TMP_LIST" "$BACKUP_DIR/database.list" || {
  echo "The current pg_restore listing differs from the retained listing." >&2
  exit 3
}
grep -q "TABLE DATA" "$TMP_LIST" || {
  echo "Archive contains no table data entries." >&2
  exit 3
}

echo "Release backup verified read-only: $BACKUP_DIR"