name: Init Argo CD Image Updater Release
on:
  workflow_dispatch:
    inputs:
      TARGET_BRANCH:
        description: 'TARGET_BRANCH to checkout (e.g. release-0.14)'
        required: true
        type: string

      TARGET_VERSION:
        description: 'TARGET_VERSION to build manifests (e.g. 0.14.0-rc1) Note: the `v` prefix is not used'
        required: true
        type: string

permissions: {}

env:
  TARGET_REMOTE: upstream
  TARGET_TAG: "v${{ inputs.TARGET_VERSION }}"

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-22.04
    steps:
      - name: Checkout code
        uses: actions/checkout@8410ad0602e1e429cee44a835ae9f77f654a6694  # v4.0.0
        with:
          fetch-depth: 0
          fetch-tags: true
          token: ${{ secrets.GITHUB_TOKEN }}
          ref: ${{ inputs.TARGET_BRANCH }}

      - name: Check if TARGET_VERSION is well formed.
        run: |
          set -ue
          # 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
          if ! echo "${{ inputs.TARGET_VERSION }}" | egrep -q '^[0-9]+\.[0-9]+\.[0-9]+$'; then
            echo "Error: Target version '${{ inputs.TARGET_VERSION }}' is not well-formed. Must be X.Y.Z" >&2
            exit 1
          fi

      - name: Checking for current git branch
        run: |
          set -ue
          RELEASE_BRANCH=$(git rev-parse --abbrev-ref HEAD || true)
          if [[ $RELEASE_BRANCH = release-* ]]; then
            echo "***   branch is $RELEASE_BRANCH"
          else
            echo "Error: Branch $RELEASE_BRANCH is not release branch" >&2
            exit 1
          fi

      - name: Checking for existence of git tag
        run: |
          set -ue
          if git show-ref --tags "${{ env.TARGET_TAG }}" --quiet; then
            echo "Error: Tag with version ${{ env.TARGET_TAG }} already exists." >&2
            exit 1
          fi

      - name: Create VERSION information
        run: |
          set -ue
          if ! test -f VERSION; then
            echo "Error: You should be in repository root." >&2
            exit 1
          fi
          echo "Bumping version from $(cat VERSION) to ${{ inputs.TARGET_VERSION }}"
          echo "${{ inputs.TARGET_VERSION }}" > VERSION

      - name: Install Kustomize
        uses: imranismail/setup-kustomize@v2
        with:
          kustomize-version: '5.2.1'

      - name: Generate new set of manifests
        run: |
          set -ue
          echo kustomize version $(kustomize version)
          make manifests IMAGE_TAG="${{ env.TARGET_TAG }}"
          git diff

      - name: Create pull request
        id: create-pull-request
        uses: peter-evans/create-pull-request@c5a7806660adbe173f04e3e038b0ccdcd758773c  # v6.1.0
        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

      - name: Next steps
        run: |
          echo "Created release PR: ${{ steps.create-pull-request.outputs.pull-request-url }}"
          echo "Once this PR is merged, pull from ${{ env.TARGET_REMOTE }} ${{ inputs.TARGET_BRANCH }}, tag the release, and build release artifacts."
          echo "If everything is fine, push changes to GitHub and container registry:"
          echo "   git fetch ${{ env.TARGET_REMOTE }} ${{ inputs.TARGET_BRANCH }}"
          echo "   git switch ${{ inputs.TARGET_BRANCH }}"
          echo "   git pull ${{ env.TARGET_REMOTE }} ${{ inputs.TARGET_BRANCH }}"
          echo "   git tag ${{ env.TARGET_TAG }}"
          echo "   make multiarch-image"
          echo "   make release-binaries"
          echo "   git push ${{ env.TARGET_REMOTE }} ${{ inputs.TARGET_BRANCH }} ${{ env.TARGET_TAG }}"
          echo "   make IMAGE_TAG='${{ env.TARGET_TAG }}' multiarch-image-push"
          echo
          echo "Then, create release tag and execute upload-multiarch-release-assets.sh"