Bonnes pratiques CI/CD

# Objectif : pipeline < 5 minutes
# Chaque minute en plus = friction = moins de commits

# Techniques d'accélération :
# - Cache npm/pnpm (actions/setup-node cache: 'npm')
# - Paralléliser les jobs (lint | typecheck | tests en parallèle)
# - concurrency: cancel-in-progress pour éviter les doublons
# - Skip les étapes inutiles (deploy seulement sur main)
# - Utiliser des images plus légères (ubuntu-latest suffit)

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 20, cache: 'npm' }
      - run: npm ci
      - run: npm run lint

  typecheck:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 20, cache: 'npm' }
      - run: npm ci
      - run: npx tsc --noEmit

  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 20, cache: 'npm' }
      - run: npm ci
      - run: npm run test

  build:
    needs: [lint, typecheck, test]   # Attend les 3 jobs
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with: { node-version: 20, cache: 'npm' }
      - run: npm ci
      - run: npm run build

# Ne déclencher le pipeline que si les fichiers concernés changent :
name: CI Frontend

on:
  push:
    branches: [main]
    paths:
      - 'frontend/**'          # Seulement si frontend/ change
      - '.github/workflows/**' # Ou si les workflows changent
  pull_request:
    paths:
      - 'frontend/**'

# Utile dans un monorepo :
# frontend/ -> pipeline frontend
# backend/  -> pipeline backend
# docs/     -> pas de pipeline

# .github/workflows/reusable-ci.yml
name: Reusable CI

on:
  workflow_call:
    inputs:
      working-directory:
        type: string
        default: '.'
      node-version:
        type: number
        default: 20

jobs:
  ci:
    runs-on: ubuntu-latest
    defaults:
      run:
        working-directory: ${{ inputs.working-directory }}
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ inputs.node-version }}
          cache: 'npm'
      - run: npm ci
      - run: npm run lint
      - run: npx tsc --noEmit
      - run: npm run build

# .github/workflows/ci-frontend.yml
name: CI Frontend

on:
  push:
    paths: ['frontend/**']

jobs:
  ci:
    uses: ./.github/workflows/reusable-ci.yml
    with:
      working-directory: frontend
      node-version: 20

# Tester sur plusieurs versions de Node en parallèle :
jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node-version: [18, 20, 22]
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
      - run: npm ci
      - run: npm run test

# Résultat : 3 jobs en parallèle (Node 18, 20, 22)
# Si l'un échoue, tu sais exactement quelle version pose problème