#!/usr/bin/env bash
#
# LuckyChit deployment — backend (Node/PM2) + frontend (Flutter web + PM2).
#
# Usage:
#   ./scripts/deploy.sh                  # backend + frontend
#   ./scripts/deploy.sh backend          # API only
#   ./scripts/deploy.sh frontend         # Flutter web only
#   ./scripts/deploy.sh backend --force  # e.g. wipe node_modules / flutter clean
#
# Env (optional):
#   LUCKYCHIT_ROOT   Repo root (default: /home/luckychit/apps/chitfund)
#   DEPLOY_BRANCH    Git branch to fast-forward to (default: prod_i8n)

set -eo pipefail

PROJECT_DIR="${LUCKYCHIT_ROOT:-/home/luckychit/apps/chitfund}"
BRANCH="${DEPLOY_BRANCH:-prod_i8n}"
FORCE_REBUILD=false
TARGET=""

usage() {
  echo "Usage: $0 [backend|frontend] [--force]"
  echo "  (no args)     deploy backend and frontend"
  echo "  backend       deploy Node API only (pm2: luckychit-api)"
  echo "  frontend      build Flutter web + restart static server (pm2: luckychit-web)"
  echo "  --force       aggressive clean (backend: rm node_modules; frontend: flutter clean)"
  exit 1
}

for arg in "$@"; do
  case "$arg" in
    --force)
      FORCE_REBUILD=true
      ;;
    backend|frontend)
      if [ -n "$TARGET" ] && [ "$TARGET" != "$arg" ]; then
        echo "Error: specify only one of backend or frontend."
        usage
      fi
      TARGET="$arg"
      ;;
    -h|--help)
      usage
      ;;
    *)
      echo "Unknown argument: $arg"
      usage
      ;;
  esac
done

run_backend() {
  [ "$TARGET" = "" ] || [ "$TARGET" = "backend" ]
}

run_frontend() {
  [ "$TARGET" = "" ] || [ "$TARGET" = "frontend" ]
}

cd "$PROJECT_DIR"

echo "LuckyChit deployment"
echo "===================="
echo "Root:   $PROJECT_DIR"
echo "Branch: $BRANCH"
echo "Target: ${TARGET:-backend+frontend}  force=$FORCE_REBUILD"
echo ""

if [ "$(id -u)" -eq 0 ]; then
  echo "Warning: running as root. Prefer a normal user so Flutter/npm caches stay consistent."
  echo ""
fi

echo "Pulling latest code..."
git fetch origin "$BRANCH"
if ! git rev-parse --verify "refs/remotes/origin/$BRANCH" >/dev/null 2>&1; then
  echo "Error: origin/$BRANCH not found. Fetch failed or branch missing on remote."
  exit 1
fi
git checkout "$BRANCH"
git merge --ff-only "origin/$BRANCH"
echo ""

if run_backend; then
  echo "Deploying backend..."
  cd "$PROJECT_DIR/backend"

  if [ "$FORCE_REBUILD" = true ]; then
    echo "Force rebuild: removing node_modules and lockfile..."
    rm -rf node_modules package-lock.json
  fi

  if [ -f package-lock.json ]; then
    npm ci
  else
    npm install
  fi

  if pm2 describe luckychit-api >/dev/null 2>&1; then
    pm2 restart luckychit-api --update-env
  else
    pm2 start ecosystem.config.js --env production
  fi
  echo "Backend done."
  echo ""
fi

if run_frontend; then
  echo "Deploying frontend (Flutter web)..."
  cd "$PROJECT_DIR/luckychit"

  if [ "$FORCE_REBUILD" = true ]; then
    echo "Force rebuild: flutter clean..."
    flutter clean
    rm -rf .dart_tool build
  fi

  flutter pub get

  if [ -f tool/sync_l10n.mjs ]; then
    node tool/sync_l10n.mjs
  fi

  BUILD_NUMBER=$(date +%s)
  flutter build web --release --pwa-strategy=none --build-number="$BUILD_NUMBER"
  echo "Build number: $BUILD_NUMBER"

  # Name must match luckychit/ecosystem.config.js (app name: luckychit-web)
  if pm2 describe luckychit-web >/dev/null 2>&1; then
    pm2 restart luckychit-web --update-env
  else
    pm2 start ecosystem.config.js --env production
  fi
  echo "Frontend done."
  echo ""
fi

echo "PM2 status:"
pm2 status

echo ""
echo "Deployment complete."
echo "Smoke tests:"
echo "  curl -sf http://localhost:3000/health  || curl -sf http://localhost:3000/api/health"
echo "  curl -sfI http://localhost:8080/"
echo "Logs: pm2 logs --lines 30"