name: CI

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

env:
  PYTHON_VERSION: '3.11'
  NODE_VERSION: '20'

# Cancel in-progress runs for the same branch
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  # ============================================================================
  # Backend Checks
  # ============================================================================

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

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Install ruff
        run: pip install ruff

      - name: Run ruff check
        run: ruff check backend/

      - name: Run ruff format check
        run: ruff format --check backend/

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

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: ${{ env.PYTHON_VERSION }}

      - name: Cache pip
        uses: actions/cache@v4
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r requirements.txt
          pip install pytest pytest-asyncio pytest-cov

      - name: Run unit tests
        run: |
          cd backend
          python -m pytest tests/unit/ -v --tb=short -m "not slow"

  # ============================================================================
  # Frontend Checks
  # ============================================================================

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

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

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

      - name: Run ESLint
        working-directory: frontend
        run: npm run lint

  frontend-typecheck:
    name: Frontend Type Check
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

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

      - name: Run TypeScript check
        working-directory: frontend
        run: npx tsc --noEmit

  frontend-tests:
    name: Frontend Tests
    runs-on: ubuntu-latest
    needs: [frontend-lint, frontend-typecheck]
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

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

      - name: Run tests
        working-directory: frontend
        run: npm run test:run

  frontend-build:
    name: Frontend Build
    runs-on: ubuntu-latest
    needs: [frontend-tests]
    steps:
      - uses: actions/checkout@v4

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

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

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

  # ============================================================================
  # Docker Build (optional, for release confidence)
  # ============================================================================

  docker-build:
    name: Docker Build
    runs-on: ubuntu-latest
    needs: [backend-tests, frontend-build]
    steps:
      - uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Build Docker image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: false
          tags: bambuddy:test
          cache-from: type=gha
          cache-to: type=gha,mode=max