#!/bin/sh
set -eu

app_dir="/srv/ai-chatbot"
compose_dir="/srv/ai-chatbot-deploy"
candidate_dir="$(mktemp -d "${app_dir}/.next-candidate.XXXXXX")"
previous_dir="${app_dir}/.next-previous-$(date +%Y%m%dT%H%M%S)"
build_container="ai-chatbot-build-$(date +%s)"

if grep -Eq '^[[:space:]]*CANVAS_E2E_LOCAL[[:space:]]*=[[:space:]]*"?true"?[[:space:]]*$' "${app_dir}/.env.local"; then
  echo "Refusing production deployment while CANVAS_E2E_LOCAL=true." >&2
  exit 1
fi

cleanup_candidate() {
  if [ -d "$candidate_dir" ]; then
    rm -rf -- "$candidate_dir"
  fi
}

trap cleanup_candidate EXIT INT TERM

docker run --rm \
  --name "$build_container" \
  --network host \
  -e NODE_OPTIONS=--max-old-space-size=6144 \
  -v "${app_dir}:/workspace" \
  -v "${candidate_dir}:/workspace/.next" \
  -w /workspace \
  node:20.20.0-bookworm-slim \
  sh -lc 'corepack enable && pnpm build'

test -s "${candidate_dir}/BUILD_ID"

docker stop ai-chatbot-app >/dev/null
docker rm ai-chatbot-app >/dev/null
if [ -d "${app_dir}/.next" ]; then
  mv "${app_dir}/.next" "$previous_dir"
fi
mv "$candidate_dir" "${app_dir}/.next"
candidate_dir=""

docker compose -f "${compose_dir}/docker-compose.yml" up -d app

health_ok=false
attempt=1
while [ "$attempt" -le 15 ]; do
  if curl -fsS --max-time 10 http://127.0.0.1:3125/login >/dev/null; then
    health_ok=true
    break
  fi
  sleep 2
  attempt=$((attempt + 1))
done

if [ "$health_ok" != true ]; then
  docker stop ai-chatbot-app >/dev/null 2>&1 || true
  docker rm ai-chatbot-app >/dev/null 2>&1 || true
  failed_dir="${app_dir}/.next-failed-$(date +%Y%m%dT%H%M%S)"
  mv "${app_dir}/.next" "$failed_dir"
  if [ -d "$previous_dir" ]; then
    mv "$previous_dir" "${app_dir}/.next"
    docker compose -f "${compose_dir}/docker-compose.yml" up -d app
  fi
  echo "Deployment health check failed; previous build restored." >&2
  exit 1
fi

echo "Production build activated. Previous build: ${previous_dir}"