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

# CASAN harness preflight (Plan-15/13 enforcement wiring).
# Runs governance cores BEFORE a model call. Currently enforces RAI data
# governance: a prompt classified PII/confidential must not go to a CLOUD model
# without approval. Opt-in via CASAN_PREFLIGHT=1 so existing flows are unchanged.
#
# Args mirror model-router: <prompt-file> <out-json> [--role R] [--model M]
# Env: CASAN_MODEL_APPROVAL (approval token for sending sensitive data to cloud)

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROMPT="${1:-}"

# SEC-20 (ARCH-04/09): fail closed if the required toolchain is missing or a
# required binary is PATH-shadowed by a planted copy (default checks only refuse on
# missing / in-workspace binaries; prod can set CASAN_TOOLCHAIN_TRUSTED_DIRS).
if [[ -f "$SCRIPT_DIR/toolchain-verify.sh" ]]; then
  if ! bash "$SCRIPT_DIR/toolchain-verify.sh" >/dev/null 2>&1; then
    echo "PREFLIGHT_BLOCK toolchain-verify (missing/shadowed binary)" >&2
    exit 1
  fi
fi

MODEL=""
while [[ $# -gt 0 ]]; do
  case "$1" in
    --model) MODEL="${2:-}"; shift 2 ;;
    *) shift ;;
  esac
done

case "$MODEL" in
  openai:*|anthropic:*)
    if [[ -n "$PROMPT" && -f "$PROMPT" ]]; then
      if ! python3 "$SCRIPT_DIR/rai-guard.py" check-cloud --input "$PROMPT" --target cloud \
            --approval "${CASAN_MODEL_APPROVAL:-}" >/dev/null 2>&1; then
        echo "PREFLIGHT_BLOCK rai-check-cloud model=$MODEL" >&2
        exit 1
      fi
    fi
    ;;
esac

echo "PREFLIGHT_OK model=${MODEL:-local}"
exit 0