name: Node.js Test
on: [push]

jobs:
  nodejs-test:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      # Use caching only when a lockfile exists (avoids setup-node error)
      - name: Set up Node.js (with cache)
        if: ${{ hashFiles('**/package-lock.json','**/npm-shrinkwrap.json','**/yarn.lock') != '' }}
        uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'

      - name: Set up Node.js (no cache)
        if: ${{ hashFiles('**/package-lock.json','**/npm-shrinkwrap.json','**/yarn.lock') == '' }}
        uses: actions/setup-node@v4
        with:
          node-version: '20'

      - name: Verify Node & npm
        run: |
          node -v
          npm -v

      - name: Install deps and run tests (or scaffold a smoke test)
        shell: bash
        run: |
          set -euo pipefail

          if [ -f package.json ]; then
            echo "package.json found."

            if [ -f package-lock.json ] || [ -f npm-shrinkwrap.json ]; then
              echo "Lockfile present -> npm ci"
              npm ci
            else
              echo "No lockfile -> npm install"
              npm install
            fi

            # Run tests only if there's a meaningful test script (not the default)
            if node -e "const p=require('./package.json'); const s=p.scripts&&p.scripts.test; process.exit(!(s && !/no test specified/i.test(String(s))));"; then
              npm test
            else
              echo "No meaningful test script found; skipping tests."
            fi

          else
            echo "No Node project detected -> scaffold a tiny Mocha test"
            npm init -y >/dev/null 2>&1
            npm install --save-dev mocha >/dev/null 2>&1
            npm pkg set scripts.test="mocha" >/dev/null 2>&1

            printf '%s\n' \
              'function add(a, b) { return a + b; }' \
              'module.exports = { add };' > sum.js

            mkdir -p test
            printf '%s\n' \
              "const assert = require('assert');" \
              "const { add } = require('../sum');" \
              "describe('add', () => {" \
              "  it('adds numbers', () => {" \
              "    assert.strictEqual(add(2, 2), 4);" \
              "  });" \
              "});" > test/sum.test.js

            npm test
          fi