name: Build & publish Docker images

on:
  push:
    branches: [main]
    tags: ['v*']
  pull_request:
    branches: [main]
  workflow_dispatch:

env:
  REGISTRY: ghcr.io

jobs:
  companion:
    name: Companion image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      - name: Set image namespace
        run: echo "IMAGE_NAMESPACE=${GITHUB_REPOSITORY_OWNER,,}" >> "$GITHUB_ENV"

      - name: Log in to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up QEMU (multi-arch)
        uses: docker/setup-qemu-action@v3

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/gluetun-companion
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

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

  sidecar:
    name: Sidecar image
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - uses: actions/checkout@v4

      - name: Set image namespace
        run: echo "IMAGE_NAMESPACE=${GITHUB_REPOSITORY_OWNER,,}" >> "$GITHUB_ENV"

      - name: Log in to GHCR
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up QEMU (multi-arch)
        uses: docker/setup-qemu-action@v3

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

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAMESPACE }}/gluetun-companion-sidecar
          tags: |
            type=ref,event=branch
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest,enable=${{ github.ref == 'refs/heads/main' }}

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

  # ── Smoke test — PRs only, reuses GHA layer cache from companion/sidecar ─
  # Builds amd64-only images (fast, via cache), starts them, checks HTTP.
  # A failed smoke test blocks merge.
  smoke-test:
    name: Smoke test
    runs-on: ubuntu-latest
    if: github.event_name == 'pull_request' || github.event_name == 'workflow_dispatch'
    needs: [companion, sidecar]   # wait for cache to be written first

    steps:
      - uses: actions/checkout@v4

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

      # Reuses the GHA layer cache populated by companion/sidecar jobs above.
      # Only amd64 is built locally (arm64 not available on ubuntu-latest runners).
      - name: Build Companion (amd64, cache reuse)
        uses: docker/build-push-action@v5
        with:
          context: .
          platforms: linux/amd64
          push: false
          load: true
          tags: companion-smoke:test
          cache-from: type=gha,scope=companion

      - name: Build Sidecar (amd64, cache reuse)
        uses: docker/build-push-action@v5
        with:
          context: ./sidecar
          platforms: linux/amd64
          push: false
          load: true
          tags: sidecar-smoke:test
          cache-from: type=gha,scope=sidecar

      # ── Companion smoke test ──────────────────────────────────────────────
      - name: Start Companion
        run: |
          mkdir -p /tmp/companion-data
          docker run -d --name companion-smoke \
            -e SECRET_KEY=smoke-test-$(openssl rand -hex 16) \
            -e GLUETUN_CONTAINER=gluetun \
            -e GLUETUN_HOST=localhost \
            -e GLUETUN_PROXY_PORT=8888 \
            -e COMPOSE_DIR=/compose \
            -v /tmp/companion-data:/data \
            -p 8765:8765 \
            companion-smoke:test

      - name: Companion health check (HTTP 2xx/3xx within 20s)
        run: |
          for i in $(seq 1 20); do
            CODE=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:8765/ 2>/dev/null || echo 0)
            if [ "$CODE" -ge 200 ] && [ "$CODE" -lt 400 ]; then
              echo "✅ Companion responded HTTP $CODE after ${i}s"
              exit 0
            fi
            echo "  [${i}/20] waiting (last code: $CODE)..."
            sleep 1
          done
          echo "❌ Companion did not respond in 20s"
          docker logs companion-smoke
          exit 1

      # ── Sidecar smoke test ───────────────────────────────────────────────
      - name: Start Sidecar
        run: |
          docker run -d --name sidecar-smoke \
            -p 8766:8766 \
            sidecar-smoke:test

      - name: Sidecar health check (HTTP on /health within 20s)
        run: |
          # /health returns 200 if VPN up, 503 if not (expected in CI).
          # Any non-zero HTTP code means the server is running.
          for i in $(seq 1 20); do
            CODE=$(curl -s -o /dev/null -w "%{http_code}" http://localhost:8766/health 2>/dev/null || echo 0)
            if [ "$CODE" != "0" ]; then
              echo "✅ Sidecar HTTP server is up (code: $CODE) after ${i}s"
              exit 0
            fi
            echo "  [${i}/20] waiting..."
            sleep 1
          done
          echo "❌ Sidecar did not respond in 20s"
          docker logs sidecar-smoke
          exit 1

      - name: Cleanup
        if: always()
        run: |
          docker stop companion-smoke sidecar-smoke 2>/dev/null || true
          docker rm  companion-smoke sidecar-smoke 2>/dev/null || true