#!/usr/bin/env bash
# CASAN — lightweight CLI wrapper (Level 1 Core Harness).
#
# Locates the harness package relative to this script (works both in the full
# source hub and in an extracted casan-core / casan-devkit bundle) and dispatches
# to the harness bash entrypoints. No dependencies beyond bash + python3.
set -uo pipefail

# --- locate the harness root (dir containing scripts/bash/casan-harness.sh) ----
_self="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
_find_harness() {
  # 1) sibling packages/casan-harness (source hub or bundle root layout)
  local c
  for c in "$_self/../packages/casan-harness" "$_self/../casan-harness" "$_self/packages/casan-harness"; do
    [[ -f "$c/scripts/bash/casan-harness.sh" ]] && { (cd "$c" && pwd); return 0; }
  done
  # 2) walk up looking for it
  local d="$_self"
  while [[ "$d" != "/" ]]; do
    [[ -f "$d/packages/casan-harness/scripts/bash/casan-harness.sh" ]] && { echo "$d/packages/casan-harness"; return 0; }
    d="$(dirname "$d")"
  done
  return 1
}
HARNESS="${CASAN_HARNESS_ROOT:-$(_find_harness)}"
if [[ -z "${HARNESS:-}" || ! -d "$HARNESS" ]]; then
  echo "casan: cannot locate packages/casan-harness (set CASAN_HARNESS_ROOT)" >&2
  exit 1
fi
BASH_DIR="$HARNESS/scripts/bash"
TESTS_DIR="$HARNESS/tests"
CASAN_APP_ROOT="${CASAN_APP_ROOT:-$(cd "$HARNESS/../.." && pwd)}"
VERSION_FILE="$_self/../VERSION"
[[ -f "$VERSION_FILE" ]] || VERSION_FILE="$HARNESS/../../VERSION"

version() { printf 'casan %s\n' "$( [[ -f "$VERSION_FILE" ]] && cat "$VERSION_FILE" || echo 'unknown')"; }

usage() {
  cat <<EOF
casan — CASAN governance harness CLI ($(version))

Usage: casan <command> [args]

Commands:
  run <in> <out> [action] [-- cmd...]  Run a step through the harness (H4→H5→H6→exec→H4-out)
  gate                                 Run the full CI harness gate (all suites)
  test                                 Run the core harness test suite (run-casan4)
  verify                               Verify audit chain + tool audit + policy bundle
  reuse                                Verify multi-project harness reuse (registry)
  project validate [--manifest path]   Validate a project manifest and quality profile
  project init <scaffold args...>      Create an idempotent NestJS/React project shell
  pipeline [--manifest path]           Run the manifest-driven SRS→test pipeline
  dashboard [port]                     Serve the AgentOps dashboard (default 8787)
  version                              Print version
  help                                 This help

Env: CASAN_HARNESS_ROOT overrides harness location.
Harness: $HARNESS
EOF
}

cmd="${1:-help}"; shift || true
case "$cmd" in
  run)        exec bash "$BASH_DIR/casan-harness.sh" "$@" ;;
  gate)
    if [[ -n "${CASAN_PROJECT_MANIFEST:-}${CASAN_PROJECT_ID:-}" ]]; then
      exec bash "$BASH_DIR/project-gate.sh" "$@"
    fi
    exec bash "$BASH_DIR/ci-harness-gate.sh" "$@" ;;
  test)       exec bash "$TESTS_DIR/run-casan4-harness-tests.sh" "$@" ;;
  verify)
    rc=0
    bash "$BASH_DIR/verify-audit-chain.sh" "$@" || rc=$?
    bash "$BASH_DIR/verify-tool-audit.sh" || rc=$?
    bash "$BASH_DIR/sign-policy-bundle.sh" verify || rc=$?
    exit $rc ;;
  reuse)      exec bash "$BASH_DIR/verify-harness-reuse.sh" "$@" ;;
  project)
    sub="${1:-help}"; shift || true
    case "$sub" in
      validate) exec python3 "$BASH_DIR/project_manifest.py" validate --root "$CASAN_APP_ROOT" "$@" ;;
      init)
        DEVKIT="${CASAN_DEVKIT_ROOT:-$CASAN_APP_ROOT/packages/casan-devkit}"
        [[ -f "$DEVKIT/project-scaffold.py" ]] || { echo "casan: project init requires the casan-devkit bundle" >&2; exit 1; }
        exec python3 "$DEVKIT/project-scaffold.py" "$@" ;;
      *) echo "casan: usage: casan project <validate|init>" >&2; exit 64 ;;
    esac ;;
  pipeline)
    RUNNER="$CASAN_APP_ROOT/scripts/run-casan-pipeline.mjs"
    [[ -f "$RUNNER" ]] || { echo "casan: pipeline runner is not installed" >&2; exit 1; }
    exec node "$RUNNER" "$@" ;;
  dashboard)  exec bash "$BASH_DIR/dashboard-serve.sh" "$@" ;;
  version|-v|--version) version ;;
  help|-h|--help) usage ;;
  *) echo "casan: unknown command '$cmd'" >&2; usage >&2; exit 64 ;;
esac