name: Publish to npm

on:
  push:
    branches:
      - main
    paths:
      - 'package.json'   # se déclenche uniquement si package.json change

jobs:
  check-and-publish:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 2   # pour pouvoir comparer avec le commit précédent

      - name: Check if version changed
        id: version_check
        run: |
          PREV=$(git show HEAD~1:package.json | node -p "require('/dev/stdin').version" 2>/dev/null || echo "none")
          CURR=$(node -p "require('./package.json').version")
          echo "prev=$PREV"
          echo "curr=$CURR"
          if [ "$PREV" != "$CURR" ]; then
            echo "changed=true" >> $GITHUB_OUTPUT
          else
            echo "changed=false" >> $GITHUB_OUTPUT
          fi

      - name: Setup Node
        if: steps.version_check.outputs.changed == 'true'
        uses: actions/setup-node@v4
        with:
          node-version: '22'
          registry-url: 'https://registry.npmjs.org'

      - name: Update npm
        if: steps.version_check.outputs.changed == 'true'
        run: npm install -g npm@latest

      - name: Install dependencies
        if: steps.version_check.outputs.changed == 'true'
        run: npm ci --legacy-peer-deps

      - name: Publish
        if: steps.version_check.outputs.changed == 'true'
        run: npm publish
        env:
          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}