name: Helm Diff Deployment
description: Diff a Helm chart for a deployment in a Kubernetes cluster
inputs:
  DEPLOYMENT_NAME:
    description: "The Kubernetes Deployment to update"
    required: true
  DEPLOYMENT_NAMESPACE:
    description: "The Kubernetes namespace of the Deployment"
    required: true
  IMAGE_PATH:
    description: "The registry path to the image"
    required: true
  IMAGE_TAG:
    description: "The image tag to deploy"
    required: true
  CONTAINER_NAME:
    description: "The container component to update"
    required: true
  VALUES_FILE:
    description: "The values file to use"
    default: "./helm/values.yaml"
  CHART_PATH:
    description: "Path to the Helm chart"
    default: "./helm"
  TAG_KEY:
    description: "Helm --set key for the image tag (e.g. deploy.api.tag)"
    required: true

runs:
  using: composite
  steps:
    - name: Install Helm Diff
      shell: sh
      run: |
        helm plugin list | grep -q diff || helm plugin install https://github.com/databus23/helm-diff
    - name: Helm Diff
      shell: sh
      run: |
        CMD="helm diff upgrade ${{ inputs.DEPLOYMENT_NAME }} ${{ inputs.CHART_PATH }} -n ${{ inputs.DEPLOYMENT_NAMESPACE }} --values ${{ inputs.VALUES_FILE }} --set ${TAG_KEY}=${{ inputs.IMAGE_TAG }} --set image.repository=${{ inputs.IMAGE_PATH }} --context 5"
        echo "Running: $CMD"
        eval "$CMD"