name: CI

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

env:
  REGISTRY: forgejo.riotpiao.com
  IMAGE: forgejo.riotpiao.com/rock/api-gateway
  DOCKER_HOST: tcp://localhost:2375

jobs:
  ci:
    name: CI
    runs-on: golang
    steps:
      - name: Install dependencies
        run: |
          apt-get update
          apt-get install -y docker.io curl nodejs
          curl -sLO "https://dl.k8s.io/release/$(curl -sL https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
          chmod +x kubectl && mv kubectl /usr/local/bin/
          kubectl version --client

      - name: Checkout code
        uses: actions/checkout@v4

      - name: Go vet
        run: go vet ./...

      - name: Go test
        run: go test ./...

      - name: Get short SHA
        id: sha
        run: echo "short_sha=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT

      - name: Registry login
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          echo "${REGISTRY_TOKEN}" | docker login "${REGISTRY}" \
            --username "${REGISTRY_USER}" --password-stdin
        env:
          REGISTRY_USER: ${{ secrets.FORGEJO_REGISTRY_USER }}
          REGISTRY_TOKEN: ${{ secrets.FORGEJO_REGISTRY_TOKEN }}

      - name: Build Docker image
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          docker build --no-cache \
            -t "${IMAGE}:${{ steps.sha.outputs.short_sha }}" \
            -f Dockerfile .

      - name: Push image (SHA tag)
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: docker push "${IMAGE}:${{ steps.sha.outputs.short_sha }}"

      # ── Deploy canary pod + integration test ────────────────
      # Canary pod runs in-cluster with real secrets and real upstreams
      # (Temporal, Gotify). Tests run against its pod IP directly.
      # Zero downtime: production pods untouched until tests pass.
      - name: Setup kubeconfig
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          mkdir -p ~/.kube
          echo "${KUBECONFIG_B64}" | base64 -d > ~/.kube/config
          kubectl get nodes --no-headers | head -1
          echo '✓ kubeconfig works'
        env:
          KUBECONFIG_B64: ${{ secrets.KUBECONFIG_B64 }}

      - name: Deploy canary pod
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        id: canary
        run: |
          SHA="${{ steps.sha.outputs.short_sha }}"
          POD_NAME="api-gateway-canary-${SHA}"

          # Remove any stale canary
          kubectl delete pod "${POD_NAME}" -n api --ignore-not-found

          # Create canary pod with real secrets + config
          kubectl run "${POD_NAME}" \
            --image="${IMAGE}:${SHA}" \
            --restart=Never \
            --namespace=api \
            --labels="app=api-gateway-canary,sha=${SHA}" \
            --overrides="$(cat <<JSON
          {
            "spec": {
              "imagePullSecrets": [{"name": "forgejo-registry"}],
              "volumes": [
                {"name": "config", "secret": {"secretName": "api-gateway-config"}}
              ],
              "containers": [{
                "name": "${POD_NAME}",
                "image": "${IMAGE}:${SHA}",
                "imagePullPolicy": "Always",
                "env": [
                  {"name": "LISTEN_ADDR",   "value": "0.0.0.0:8080"},
                  {"name": "CONFIG_PATH",   "value": "/etc/gateway/config.yaml"},
                  {"name": "LOG_LEVEL",     "value": "info"},
                  {"name": "GOTIFY_URL",           "valueFrom": {"secretKeyRef": {"name": "gotify-webhook-secret", "key": "gotify-url",              "optional": true}}},
                  {"name": "GOTIFY_APP_TOKEN",     "valueFrom": {"secretKeyRef": {"name": "gotify-webhook-secret", "key": "gotify-app-token",        "optional": true}}},
                  {"name": "FORGEJO_WEBHOOK_SECRET","valueFrom": {"secretKeyRef": {"name": "gotify-webhook-secret", "key": "forgejo-webhook-secret", "optional": true}}},
                  {"name": "AUTH_CLIENT_SECRET",   "valueFrom": {"secretKeyRef": {"name": "api-gw-client-secret",  "key": "client-secret",          "optional": true}}}
                ],
                "volumeMounts": [
                  {"name": "config", "mountPath": "/etc/gateway", "readOnly": true}
                ],
                "readinessProbe": {
                  "httpGet": {"path": "/healthz", "port": 8080},
                  "initialDelaySeconds": 3,
                  "periodSeconds": 2
                }
              }]
            }
          }
          JSON
          )"

          echo "✓ Canary pod created: ${POD_NAME}"

          # Wait for pod to be ready (real secrets, real upstreams)
          kubectl wait pod/"${POD_NAME}" -n api \
            --for=condition=Ready --timeout=90s

          # Capture pod IP for test runner
          POD_IP=$(kubectl get pod "${POD_NAME}" -n api \
            -o jsonpath='{.status.podIP}')
          echo "pod_name=${POD_NAME}" >> $GITHUB_OUTPUT
          echo "pod_ip=${POD_IP}"     >> $GITHUB_OUTPUT
          echo "✓ Canary ready at ${POD_IP}:8080"

      - name: Run integration tests against canary
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        id: tests
        run: |
          POD_IP="${{ steps.canary.outputs.pod_ip }}"
          GW="http://${POD_IP}:8080"
          RESULTS_DIR="/tmp/test-results"
          mkdir -p "${RESULTS_DIR}"

          echo "Running integration tests against canary at ${GW}..."
          sh k8s/tekton/scripts/integration-test.sh

          RESULT=$(cat "${RESULTS_DIR}/result" 2>/dev/null || echo "fail")
          SUMMARY=$(cat "${RESULTS_DIR}/summary" 2>/dev/null || echo "unknown")
          echo "Result: ${RESULT}"
          echo "Summary: ${SUMMARY}"
          echo "result=${RESULT}" >> $GITHUB_OUTPUT

      - name: Cleanup canary pod
        if: always() && github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          POD_NAME="${{ steps.canary.outputs.pod_name }}"
          kubectl delete pod "${POD_NAME}" -n api --ignore-not-found || true
          echo "✓ Canary pod removed"

      - name: Gate on test result
        if: github.event_name == 'push' && github.ref == 'refs/heads/main' && steps.tests.outputs.result != 'pass'
        run: |
          echo "✗ Integration tests FAILED — production deployment unchanged"
          exit 1

      # ── Zero-downtime promotion ──────────────────────────────
      # kubectl set image triggers a rolling update: new pods come up
      # before old pods are terminated. Production traffic uninterrupted.
      - name: Promote — rolling update
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          SHA="${{ steps.sha.outputs.short_sha }}"
          kubectl set image deployment/api-gateway \
            api-gateway="${IMAGE}:${SHA}" -n api
          kubectl rollout status deployment/api-gateway -n api --timeout=120s
          echo "✓ Rolling update complete: ${IMAGE}:${SHA}"

      - name: Tag :latest (informational)
        if: github.event_name == 'push' && github.ref == 'refs/heads/main'
        run: |
          docker tag "${IMAGE}:${{ steps.sha.outputs.short_sha }}" "${IMAGE}:latest"
          docker push "${IMAGE}:latest"
          echo "✓ Tagged :latest"

      - name: Cleanup docker images
        if: always()
        run: docker image prune -af 2>&1 | tail -3 || true