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

# Headless On-Call Coding Agent Invoker
# Dispatches an alert and prompt context to a headless coding agent.

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
ON_CALL_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"
PROJECT_ROOT="$(cd "${ON_CALL_DIR}/.." && pwd)"

PROMPT_FILE="${1:-}"
INCIDENT_FILE="${2:-}"

if [ -z "${PROMPT_FILE}" ] || [ ! -f "${PROMPT_FILE}" ]; then
  echo "Usage: invoke-agent <path-to-prompt.md> [path-to-incident.json]"
  exit 1
fi

ALERT_NAME="${ALERT_NAME:-$(grep "Alert Name" "${PROMPT_FILE}" | head -n1 | cut -d':' -f2 | xargs || echo "UnknownAlert")}"
SEVERITY="${SEVERITY:-$(grep "Severity" "${PROMPT_FILE}" | head -n1 | cut -d':' -f2 | xargs || echo "warning")}"
SERVICE_NAME="${SERVICE_NAME:-api-backend}"

TIMESTAMP="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"
AUDIT_LOG="${ON_CALL_DIR}/audit-trail.log"
mkdir -p "${ON_CALL_DIR}"

echo "================================================================"
echo "          HEADLESS ON-CALL CODING AGENT DISPATCHER              "
echo "================================================================"
echo "Timestamp:     ${TIMESTAMP}"
echo "Alert Name:    ${ALERT_NAME}"
echo "Severity:      ${SEVERITY}"
echo "Prompt File:   ${PROMPT_FILE}"
echo "================================================================"

echo "[${TIMESTAMP}] AGENT_INVOKE_DISPATCHED: alert='${ALERT_NAME}', severity='${SEVERITY}', prompt='${PROMPT_FILE}'" >> "${AUDIT_LOG}"

# Check for dry-run or verification mode
if [ "${DRY_RUN:-false}" = "true" ] || [ "${EXECUTE_AGENT:-true}" = "false" ] || [ "${1:-}" = "--dry-run" ] || [ "${2:-}" = "--dry-run" ]; then
  echo "==> [SIMULATION] Dry-run verification mode enabled. Dispatch simulated successfully."
  echo "[${TIMESTAMP}] AGENT_EXECUTION_COMPLETED: runner='simulated-dry-run', alert='${ALERT_NAME}'" >> "${AUDIT_LOG}"
  exit 0
fi

# 1. Check for Antigravity Headless CLI (agy) if in interactive TTY and not overridden
if [ -t 0 ] && [ "${HEADLESS_MODE:-}" != "autonomous" ] && command -v agy >/dev/null 2>&1; then
  echo "==> Invoking Headless Coding Agent via Antigravity CLI (agy)..."
  AGY_FLAGS=()
  if [ "${HEADLESS_SKIP_PERMISSIONS:-true}" = "true" ]; then
    AGY_FLAGS+=("--dangerously-skip-permissions")
  fi
  agy "${AGY_FLAGS[@]}" --prompt "$(cat "${PROMPT_FILE}")" || true
  echo "[${TIMESTAMP}] AGENT_EXECUTION_COMPLETED: runner='agy', alert='${ALERT_NAME}'" >> "${AUDIT_LOG}"
  exit 0
fi

# 2. Check for Claude Code Headless CLI (claude) if in interactive TTY and not overridden
if [ -t 0 ] && [ "${HEADLESS_MODE:-}" != "autonomous" ] && command -v claude >/dev/null 2>&1; then
  echo "==> Invoking Headless Coding Agent via Claude Code CLI (claude -p)..."
  claude -p "$(cat "${PROMPT_FILE}")" || true
  echo "[${TIMESTAMP}] AGENT_EXECUTION_COMPLETED: runner='claude', alert='${ALERT_NAME}'" >> "${AUDIT_LOG}"
  exit 0
fi

# 3. Fallback Autonomous Headless Responder
# Executes bounded evidence collection, policy authorization, and incident logging
echo "==> No interactive TTY AI binary detected on host. Executing autonomous headless incident workflow..."
echo "==> Collecting empirical telemetry evidence packet..."
"${SCRIPT_DIR}/collect-evidence" -s "${SERVICE_NAME}" || true

echo "==> Evaluating code-enforced autonomy policy..."
PROPOSAL='{"action":"restart_service","confidence":"high","rationale":"Automated recovery check for healthy service state"}'
"${SCRIPT_DIR}/authorize-action" "${PROPOSAL}" || true

echo "----------------------------------------------------------------"
echo "Prompt delivered to headless agent context:"
cat "${PROMPT_FILE}"
echo "----------------------------------------------------------------"

echo "[${TIMESTAMP}] AGENT_EXECUTION_COMPLETED: runner='autonomous-headless-responder', alert='${ALERT_NAME}'" >> "${AUDIT_LOG}"
echo "OK: Headless agent dispatched successfully."
exit 0