name: Deploy to Kubernetes

on:
  workflow_dispatch:
    inputs:
      image_tag:
        description: 'Docker image tag to deploy'
        required: true
        default: 'latest'
        type: string
      environment:
        description: 'Deployment environment'
        required: false
        default: 'production'
        type: string

env:
  REGISTRY: ${{ secrets.CONTAINER_REGISTRY }}
  IMAGE_NAME: ${{ secrets.IMAGE_NAME }}
  APP_NAME: ${{ secrets.APP_NAME }}
  HOST: ${{ secrets.HOST }}
  NAMESPACE: ${{ secrets.K8S_NAMESPACE }}

jobs:
  deploy:
    runs-on: ubuntu-latest
    
    steps:
    - name: Checkout code
      uses: actions/checkout@v4
      
    - name: Setup kubectl
      uses: azure/setup-kubectl@v3
      with:
        version: 'v1.28.0'
        
    - name: Configure kubectl
      run: |
        echo "${{ secrets.KUBECONFIG_BASE64 }}" | base64 -d > kubeconfig
        export KUBECONFIG=kubeconfig
        kubectl config current-context
        
    - name: Create namespace if not exists
      run: |
        export KUBECONFIG=kubeconfig
        kubectl create namespace ${{ env.NAMESPACE }} --dry-run=client -o yaml | kubectl apply -f -
        
    - name: Deploy to Kubernetes
      run: |
        export KUBECONFIG=kubeconfig
        
        # Replace variables in manifests and apply
        for manifest in k8s/*.yaml; do
          sed -e "s/\${APP_NAME}/${{ env.APP_NAME }}/g" \
              -e "s/\${NAMESPACE}/${{ env.NAMESPACE }}/g" \
              -e "s/\${REGISTRY}/${{ env.REGISTRY }}/g" \
              -e "s/\${IMAGE_NAME}/${{ env.IMAGE_NAME }}/g" \
              -e "s/\${IMAGE_TAG}/${{ inputs.image_tag }}/g" \
              -e "s/\${HOST}/${{ env.HOST }}/g" \
              "$manifest" | kubectl apply -f -
        done
        
    - name: Verify deployment
      run: |
        export KUBECONFIG=kubeconfig
        kubectl rollout status deployment/${{ env.APP_NAME }} -n ${{ env.NAMESPACE }}
        kubectl get pods -n ${{ env.NAMESPACE }} -l app=${{ env.APP_NAME }}
        
    - name: Cleanup
      if: always()
      run: |
        rm -f kubeconfig