name: CI

on:
  push:
    branches: [main, develop]
    tags:
      - 'v*'
  pull_request:
    branches: [main, develop]
  schedule:
    - cron: '0 0 * * 0' # Weekly on Sunday (security scans)
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  # ── Phase 1: Lint ──────────────────────────────────────────────────────
  lint:
    name: Lint
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: '3.14'

      - name: Install Python linting tools
        run: |
          python -m pip install --upgrade pip
          pip install black ruff mypy
          pip install -r backend/requirements.txt

      - name: Check code formatting with Black
        run: black --check backend/

      - name: Lint with Ruff
        run: ruff check backend/

      - name: Type check with mypy
        run: mypy backend/app --ignore-missing-imports
        continue-on-error: true

      - name: Set up Node.js
        uses: actions/setup-node@v6
        with:
          node-version: '20.19.0'
          cache: 'npm'
          cache-dependency-path: frontend/package-lock.json

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

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

  # ── Phase 2: Test ──────────────────────────────────────────────────────
  test:
    name: Test
    needs: lint
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write

    services:
      postgres:
        image: postgres:15
        env:
          POSTGRES_USER: postgres
          POSTGRES_PASSWORD: postgres
          POSTGRES_DB: pop3_forwarder_test
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 5432:5432

      redis:
        image: redis:7-alpine
        options: >-
          --health-cmd "redis-cli ping"
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 6379:6379

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: '3.14'
          cache: 'pip'

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

      - name: Run tests with coverage
        env:
          DATABASE_URL: postgresql+asyncpg://postgres:postgres@localhost:5432/pop3_forwarder_test
          REDIS_URL: redis://localhost:6379/0
          SECRET_KEY: test-secret-key-for-ci-cd-at-least-32-chars
          ENCRYPTION_KEY: test-encryption-key-for-ci-cd-at-least-32-chars
        run: |
          cd backend
          pytest tests/ -v --cov=app --cov-report=xml --cov-report=term

      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v5
        with:
          file: ./backend/coverage.xml
          flags: unittests
          name: codecov-umbrella
          fail_ci_if_error: false

  # ── Phase 3: Security ──────────────────────────────────────────────────
  security:
    name: Security
    needs: test
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v6
        with:
          python-version: '3.14'

      - name: Install dependencies
        run: |
          python -m pip install --upgrade pip
          pip install bandit safety
          pip install -r backend/requirements.txt

      - name: Run Bandit security scan
        run: bandit -r backend/app -ll
        continue-on-error: true

      - name: Check dependencies for known vulnerabilities
        run: safety check --json
        continue-on-error: true

  # ── Phase 4: Build ─────────────────────────────────────────────────────
  build:
    name: Build & Push Docker Image
    needs: security
    if: github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v')
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write
      attestations: write

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=semver,pattern={{major}}
            type=sha
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Build and push Docker image
        id: build-push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max
          platforms: linux/amd64,linux/arm64

      - name: Generate artifact attestation
        uses: actions/attest-build-provenance@v1
        with:
          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          subject-digest: ${{ steps.build-push.outputs.digest }}
          push-to-registry: true