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:
  GHCR_REGISTRY: ghcr.io
  PRIVATE_REGISTRY: registry.cklnet.com
  K8S_STATE_REPO: christianlouis/k8s-cluster-state

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: '3.12'

      - 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: inbox_converge_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: '3.12'
          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/inbox_converge_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: '3.12'

      - 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

    strategy:
      matrix:
        include:
          - context: ./backend
            image_name: inboxconverge/backend
          - context: ./frontend
            image_name: inboxconverge/frontend

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

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

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

      # Requires PRIVATE_REGISTRY_USERNAME and PRIVATE_REGISTRY_PASSWORD secrets
      - name: Log in to private registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.PRIVATE_REGISTRY }}
          username: ${{ secrets.PRIVATE_REGISTRY_USERNAME }}
          password: ${{ secrets.PRIVATE_REGISTRY_PASSWORD }}

      - name: Extract metadata (tags, labels)
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            ${{ env.GHCR_REGISTRY }}/${{ github.repository_owner }}/${{ matrix.image_name }}
            ${{ env.PRIVATE_REGISTRY }}/${{ matrix.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: ${{ matrix.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

  # ── Phase 5: GitOps – update preprod k8s manifest ─────────────────────────
  update-k8s-manifest:
    name: Update Preprod K8s Manifest
    runs-on: ubuntu-latest
    needs: [build]
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
    permissions:
      contents: read

    steps:
      - name: Compute image tags
        id: tag
        run: |
          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
          echo "backend_image=ghcr.io/${{ github.repository_owner }}/inboxconverge/backend:sha-${SHORT_SHA}" >> "$GITHUB_OUTPUT"
          echo "frontend_image=ghcr.io/${{ github.repository_owner }}/inboxconverge/frontend:sha-${SHORT_SHA}" >> "$GITHUB_OUTPUT"
          echo "short_sha=${SHORT_SHA}" >> "$GITHUB_OUTPUT"

      - name: Check if GH_PAT is configured and has repo access
        id: pat-check
        env:
          GH_PAT: ${{ secrets.GH_PAT }}
        run: |
          if [ -z "$GH_PAT" ]; then
            echo "::warning::GH_PAT secret is not configured. Skipping k8s manifest update."
            echo "available=false" >> "$GITHUB_OUTPUT"
          else
            HTTP_CODE=$(curl -s -o /dev/null -w "%{http_code}" \
              --oauth2-bearer "$GH_PAT" \
              "https://api.github.com/repos/${{ env.K8S_STATE_REPO }}")
            if [ "$HTTP_CODE" = "200" ]; then
              echo "available=true" >> "$GITHUB_OUTPUT"
            else
              echo "::warning::GH_PAT does not have access to ${{ env.K8S_STATE_REPO }} (HTTP $HTTP_CODE). Skipping k8s manifest update."
              echo "available=false" >> "$GITHUB_OUTPUT"
            fi
          fi

      - name: Checkout k8s-cluster-state
        if: steps.pat-check.outputs.available == 'true'
        uses: actions/checkout@v4
        with:
          repository: ${{ env.K8S_STATE_REPO }}
          token: ${{ secrets.GH_PAT }}
          path: k8s-cluster-state
          ref: main

      - name: Update backend image tag in preprod manifest
        if: steps.pat-check.outputs.available == 'true'
        uses: mikefarah/yq@v4.44.6
        env:
          IMAGE: ${{ steps.tag.outputs.backend_image }}
        with:
          cmd: |
            yq -i '(.. | select(tag == "!!str") | select(test("^ghcr\\.io/christianlouis/inboxconverge/backend:"))) = strenv(IMAGE)' \
              k8s-cluster-state/apps/gmail-puller/preprod/gmail-puller-stack.yaml

      - name: Update frontend image tag in preprod manifest
        if: steps.pat-check.outputs.available == 'true'
        uses: mikefarah/yq@v4.44.6
        env:
          IMAGE: ${{ steps.tag.outputs.frontend_image }}
        with:
          cmd: |
            yq -i '(.. | select(tag == "!!str") | select(test("^ghcr\\.io/christianlouis/inboxconverge/frontend:"))) = strenv(IMAGE)' \
              k8s-cluster-state/apps/gmail-puller/preprod/gmail-puller-stack.yaml

      - name: Commit and push manifest update
        if: steps.pat-check.outputs.available == 'true'
        run: |
          cd k8s-cluster-state
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add apps/gmail-puller/preprod/gmail-puller-stack.yaml
          if git diff --staged --quiet; then
            echo "No changes to commit"
          else
            git commit -m "chore(preprod): update inboxconverge images to ${{ steps.tag.outputs.short_sha }}"
            git push
          fi