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
        env:
          KUBE_CONFIG: ${{ secrets.K3S_CONFIG }}
        shell: bash
        run: |
          # Fetch the latest stable version of kubectl
          KUBECTL_VERSION=$(curl -s https://dl.k8s.io/release/stable.txt)
          if [ -z "$KUBECTL_VERSION" ]; then
            echo "Failed to fetch the latest kubectl version. Exiting."
            exit 1
          fi

          # Download kubectl binary
          curl -LO "https://dl.k8s.io/release/v1.31.0/bin/linux/amd64/kubectl"
          if [ $? -ne 0 ]; then
            echo "Failed to download kubectl binary. Exiting."
            exit 1
          fi

          # Make kubectl executable and move to PATH
          chmod +x kubectl
          sudo mv kubectl /usr/local/bin/

          # Verify kubectl installation
          kubectl version --client

          # Install kubelogin
          curl -fsSLO https://github.com/int128/kubelogin/releases/download/v1.25.4/kubelogin_linux_amd64.zip
          unzip kubelogin_linux_amd64.zip kubelogin -d kubelogin
          mv kubelogin/kubelogin kubelogin/kubectl-oidc_login
          export PATH=$PATH:$(realpath kubelogin)
          
          # Configure kubeconfig
          mkdir -p ~/.kube
          echo "$KUBE_CONFIG" > ~/.kube/config                        

      - name: Generate and Apply K8s Manifests
        run: |
          # Get repository name and convert to lowercase
          REPO_NAME=$(echo "${GITHUB_REPOSITORY##*/}" | tr '[:upper:]' '[:lower:]')
          FULL_REPO=$(echo "${GITHUB_REPOSITORY}" | tr '[:upper:]' '[:lower:]')
          
          # Set namespace consistently
          NAMESPACE="gitea-deployment"
          
          echo "Using repository name: $REPO_NAME"
          echo "Using full repository path: $FULL_REPO"
          echo "Using namespace: $NAMESPACE"
          
          # Create namespace if it doesn't exist
          kubectl get namespace $NAMESPACE || kubectl create namespace $NAMESPACE
          
          cat <<EOF > k8s-manifests.yaml
          apiVersion: apps/v1
          kind: Deployment
          metadata:
            name: ${REPO_NAME}
            namespace: ${NAMESPACE}
            labels:
              app: ${REPO_NAME}
          spec:
            replicas: 1
            selector:
              matchLabels:
                app: ${REPO_NAME}
            template:
              metadata:
                labels:
                  app: ${REPO_NAME}
              spec:
                containers:
                - name: ${REPO_NAME}
                  image: git.ionas999.at/${FULL_REPO}:latest
                  ports:
                  - containerPort: 80
          ---
          apiVersion: v1
          kind: Service
          metadata:
            name: ${REPO_NAME}
            namespace: ${NAMESPACE}
          spec:
            type: ClusterIP
            ports:
            - port: 80
              targetPort: 80
            selector:
              app: ${REPO_NAME}
          ---
          apiVersion: networking.k8s.io/v1
          kind: Ingress
          metadata:
            name: ${REPO_NAME}-ingress
            namespace: ${NAMESPACE}
            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:
              - ${REPO_NAME}.git.ionas999.at
            rules:
            - host: ${REPO_NAME}.git.ionas999.at
              http:
                paths:
                - path: /
                  pathType: Prefix
                  backend:
                    service:
                      name: ${REPO_NAME}
                      port:
                        number: 80
          EOF

          
          kubectl delete deployment "${Reponame}" -n gitea-deployment --ignore-not-found
          kubectl delete service "${Reponame}" -n gitea-deployment --ignore-not-found
          kubectl delete ingress "${Reponame}-ingress" -n gitea-deployment --ignore-not-found

          # Display the manifest for debugging
          echo "--- Generated manifest: ---"
          cat k8s-manifests.yaml
          echo "-------------------------"
          
          # Apply the manifests
          kubectl apply -f k8s-manifests.yaml