name: CI

on:
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

jobs:
  backend:
    name: Backend tests
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-python@v5
        with:
          python-version: "3.12"   # matches the Dockerfile
          cache: pip
          cache-dependency-path: |
            backend/requirements.txt
            backend/requirements-dev.txt

      - name: Install dependencies
        working-directory: backend
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt -r requirements-dev.txt

      - name: Run tests
        working-directory: backend
        run: python -m pytest tests/ -q

  frontend:
    name: Frontend lint + build
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: "24"       # matches the Dockerfile
          cache: npm
          cache-dependency-path: frontend/package-lock.json

      - name: Install dependencies
        working-directory: frontend
        run: npm ci

      - name: Lint
        working-directory: frontend
        run: npm run lint

      - name: Build
        working-directory: frontend
        run: npm run build

  docker:
    name: Docker image builds
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: docker/setup-buildx-action@v3
      - name: Build image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: false
          cache-from: type=gha
          cache-to: type=gha,mode=max