name: Build, Publish Docker Image, and Deploy to Kubernetes

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  build_and_push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Check if Dockerfile exists
        id: check_dockerfile
        run: |
          if [ -f "Dockerfile" ]; then
            echo "exists=true" >> $GITHUB_ENV
          else
            echo "exists=false" >> $GITHUB_ENV
          fi

      - name: Set repository name as image name
        if: env.exists == 'true'
        run: echo "IMAGE_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV

      - name: Log in to Docker registry
        if: env.exists == 'true'
        run: |
          echo "${{ secrets.REGISTRY_PASSWORD }}" | docker login git.ionas999.at -u ${{ secrets.REGISTRY_USERNAME }} --password-stdin

      - name: Build Docker image
        if: env.exists == 'true'
        run: |
          docker build -t git.ionas999.at/${{ env.IMAGE_NAME }}:latest .

      - name: Push Docker image
        if: env.exists == 'true'
        run: |
          docker push git.ionas999.at/${{ env.IMAGE_NAME }}:latest

  deploy_to_k8s:
    runs-on: ubuntu-latest
    needs: build_and_push
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install kubectl
        run: |
          # Fetch the latest stable version of kubectl
          KUBECTL_VERSION=$(curl -s https://dl.k8s.io/release/stable.txt)
          curl -LO "https://dl.k8s.io/release/$KUBECTL_VERSION/bin/linux/amd64/kubectl"
          chmod +x kubectl
          sudo mv kubectl /usr/local/bin/
          kubectl version --client

      - name: Configure kubectl using K3s config
        run: |
          mkdir -p ~/.kube
          echo "${{ secrets.K3S_CONFIG }}" > ~/.kube/config

      - name: Generate and Apply K3s Deployment and Ingress
        run: |
          cat > k3s_deployment.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: ${GITHUB_REPOSITORY}
  labels:
    app: ${GITHUB_REPOSITORY}
spec:
  replicas: 1
  selector:
    matchLabels:
      app: ${GITHUB_REPOSITORY}
  template:
    metadata:
      labels:
        app: ${GITHUB_REPOSITORY}
    spec:
      containers:
      - name: ${GITHUB_REPOSITORY}
        image: git.ionas999.at/${GITHUB_REPOSITORY}:latest
        ports:
        - containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
  name: ${GITHUB_REPOSITORY}
spec:
  type: ClusterIP
  ports:
  - port: 80
    targetPort: 80
  selector:
    app: ${GITHUB_REPOSITORY}
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ${GITHUB_REPOSITORY}-ingress
  namespace: gitea-deployment
  annotations:
    traefik.ingress.kubernetes.io/router.entrypoints: websecure
    traefik.ingress.kubernetes.io/router.tls: "true"
    traefik.ingress.kubernetes.io/router.tls.certresolver: le
spec:
  ingressClassName: traefik
  tls:
  - hosts:
    - ${GITHUB_REPOSITORY}.git.ionas999.at
  rules:
  - host: ${GITHUB_REPOSITORY}.git.ionas999.at
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: ${GITHUB_REPOSITORY}
            port:
              number: 80
EOF

          kubectl apply -f k3s_deployment.yaml