name: Check milestone
description: Checks if the given milestone and its according tag are valid to be released
inputs:
  milestone:
    description: Milestone for this release
    required: true
  github_token:
    description: Secret GitHub token
    required: true
outputs:
  outcome:
    description: Result of the check, success or failure
    value: ${{ steps.outcome.outputs.outcome }}
runs:
  using: composite
  steps:
    - name: Get tag uniqueness
      id: unique_tag
      uses: mukunku/tag-exists-action@v1.0.0
      with:
        tag: ${{ env.MILESTONE }}
      env:
        MILESTONE: ${{ inputs.milestone }}
        GITHUB_TOKEN: ${{ inputs.github_token }}

    - name: Get closed issues for milestone
      id: closed_issues
      uses: octokit/graphql-action@v2.x
      with:
        query: |
          query {
            search(first: 1, type: ISSUE, query: "user:${{ github.repository_owner }} repo:${{ github.event.repository.name }} milestone:${{ env.MILESTONE }} state:closed") {
              issueCount
            }
          }
      env:
        MILESTONE: ${{ inputs.milestone }}
        GITHUB_TOKEN: ${{ inputs.github_token }}

    - name: Get open issues for milestone
      id: open_issues
      uses: octokit/graphql-action@v2.x
      with:
        query: |
          query {
            search(first: 1, type: ISSUE, query: "user:${{ github.repository_owner }} repo:${{ github.event.repository.name }} milestone:${{ env.MILESTONE }} state:open") {
              issueCount
            }
          }
      env:
        MILESTONE: ${{ inputs.milestone }}
        GITHUB_TOKEN: ${{ inputs.github_token }}

    - name: Set outcome
      id: outcome
      shell: bash
      run: |
        if [ "${{ fromJSON(steps.closed_issues.outputs.data).search.issueCount > 0 && fromJSON(steps.open_issues.outputs.data).search.issueCount == 0 && steps.unique_tag.outputs.exists == 'false' }}" = "true" ]; then
          echo "::set-output name=outcome::success"
        else
          echo "::set-output name=outcome::failure"
        fi

    - name: Log results and exit
      shell: bash
      run: |
        echo outcome          : ${{ steps.outcome.outputs.outcome }}
        echo has unique tag   : ${{ steps.unique_tag.outputs.exists == 'false' }}
        echo has closed issues: ${{ fromJSON(steps.closed_issues.outputs.data).search.issueCount > 0 }}
        echo has open issues  : ${{ fromJSON(steps.open_issues.outputs.data).search.issueCount > 0 }}
        if [ "${{ steps.outcome.outputs.outcome }}" = "failure" ]; then
          exit 1
        fi