#!/usr/bin/env bash

set -Eeuo pipefail

APP_NAME="${APP_NAME:-pc_nuxt}"
BRANCH="${BRANCH:-}"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

cd "$SCRIPT_DIR"

log() {
  printf '\n[%s] %s\n' "$(date '+%Y-%m-%d %H:%M:%S')" "$*"
}

require_command() {
  if ! command -v "$1" >/dev/null 2>&1; then
    log "Missing command: $1"
    exit 1
  fi
}

ensure_clean_worktree() {
  if [ -n "$(git status --porcelain)" ]; then
    log "Working tree is not clean. Commit/stash/clean changes before deploy."
    git status --short
    exit 1
  fi
}

resolve_branch() {
  if [ -z "$BRANCH" ]; then
    BRANCH="$(git rev-parse --abbrev-ref HEAD)"
  fi
  if [ "$BRANCH" = "HEAD" ]; then
    log "Cannot detect git branch. Please run with BRANCH=main ./restart.sh"
    exit 1
  fi
}

pull_latest_code() {
  log "Pull latest code from origin/$BRANCH"
  ensure_clean_worktree
  git fetch origin "$BRANCH"
  git pull --ff-only origin "$BRANCH"
}

install_dependencies() {
  log "Install dependencies"
  pnpm install --frozen-lockfile
}

build_app() {
  log "Build Nuxt app"
  pnpm run build

  if [ ! -f ".output/server/index.mjs" ]; then
    log "Build output missing: .output/server/index.mjs"
    exit 1
  fi
}

restart_app() {
  log "Reload app with pm2 ecosystem config"
  mkdir -p logs
  APP_NAME="$APP_NAME" pm2 startOrReload ecosystem.config.cjs --env production --update-env
  pm2 save >/dev/null 2>&1 || true
}

main() {
  require_command git
  require_command node
  require_command pnpm
  require_command pm2
  resolve_branch

  log "Deploy start: $APP_NAME"
  log "Node: $(node -v 2>/dev/null || echo 'unknown')"
  log "pnpm: $(pnpm -v)"
  log "pm2: $(pm2 -v)"

  pull_latest_code
  install_dependencies
  build_app
  restart_app

  log "Deploy done: $APP_NAME"
}

main "$@"