name: Init Release
on:
  workflow_dispatch:
    inputs:
      TARGET_BRANCH:
        description: 'TARGET_BRANCH on which release will be based'
        required: true
        type: string

      TARGET_VERSION:
        description: 'TARGET_VERSION to build kubernetes manifests with using Kustomize'
        required: true
        type: string

permissions: {}

jobs:
  prepare-release:
    permissions:
      contents: write  # for peter-evans/create-pull-request to create branch
      pull-requests: write  # for peter-evans/create-pull-request to create a PR
    name: Automatically generate version and manifests on ${{ inputs.TARGET_BRANCH }}
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v5.0.0
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}
          ref: ${{ inputs.TARGET_BRANCH }}

      - name: Check if TARGET_VERSION is well formed.
        run: |
          set -xue
          # Target version must not contain 'v' prefix
          if echo "${{ inputs.TARGET_VERSION }}" | grep -e '^v'; then
            echo "::error::Target version '${{ inputs.TARGET_VERSION }}' should not begin with a 'v' prefix, refusing to continue." >&2
            exit 1
          fi

      - name: Create VERSION information
        run: |
          set -ue
          echo "Bumping version from $(cat VERSION) to ${{ inputs.TARGET_VERSION }}"
          echo "${{ inputs.TARGET_VERSION }}" > VERSION

      - name: Replace latest tag with version from input
        run: |
          set -ue
          VERSION=${{ inputs.TARGET_VERSION }} make update-manifests-version
          git diff

      - name: Generate new set of manifests
        run: |
          set -ue
          make k8s-manifests
          git diff

      - name: Create pull request
        uses: peter-evans/create-pull-request@v7.0.8
        with:
          commit-message: "Bump version to ${{ inputs.TARGET_VERSION }}"
          title: "Bump version to ${{ inputs.TARGET_VERSION }} on ${{ inputs.TARGET_BRANCH }} branch"
          body: Updating VERSION and manifests to ${{ inputs.TARGET_VERSION }}
          branch: update-version
          branch-suffix: random
          signoff: true
          labels: release