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

# CASAN H5 — Ship the audit head to an external append-only WORM ledger (C5/V21).
# Call after each audit seal. Locally this appends a hash-linked anchor to a
# ledger on a separate path (default outside .specify/logs/audit); production
# ships to S3 Object Lock / QLDB. On Linux the ledger is best-effort set
# append-only immutable (chattr +a).
#
# Usage: audit-ship.sh [head-file] [ledger-file]
# Env: CASAN_WORM_LEDGER (default .specify/logs/worm/anchor-ledger.jsonl)

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
source "$SCRIPT_DIR/casan-paths.sh"
PROJECT_ROOT="$CASAN_APP_ROOT"
HEAD_FILE="${1:-$CASAN_STATE_ROOT/logs/audit/audit-head.txt}"
LEDGER="${2:-${CASAN_WORM_LEDGER:-$CASAN_STATE_ROOT/logs/worm/anchor-ledger.jsonl}}"
mkdir -p "$(dirname "$LEDGER")"

[[ -f "$HEAD_FILE" ]] || { echo "AUDIT_SHIP_NO_HEAD file=$HEAD_FILE" >&2; exit 1; }

# Append-only immutability on Linux (best-effort; no-op on macOS/CI without cap).
if command -v chattr >/dev/null 2>&1; then chattr -a "$LEDGER" 2>/dev/null || true; fi
python "$SCRIPT_DIR/worm-ledger.py" ship "$HEAD_FILE" "$LEDGER"; RC=$?
if command -v chattr >/dev/null 2>&1; then chattr +a "$LEDGER" 2>/dev/null || true; fi
exit "$RC"