name: Check mergeability

on: pull_request # run on pull request events

permissions:
  # grant write permission on the pull-requests endpoint
  pull-requests: write
jobs:
  check:
    runs-on: ubuntu-latest
    steps:
      - name: Retrieve existing PR reviews
        id: set-reviews
        run: |
          echo ::set-output name=reviews::$(curl --request GET \
            --url https://api.github.com/repos/${{github.repository}}/pulls/${{github.event.number}}/reviews \
            --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}')

      - name: Check if there is already a block on this PR
        id: set-blocks
        run: |
          echo ::set-output name=blocks::$(echo '${{ steps.set-reviews.outputs.reviews }}' \
            | jq '.[] | select(.user.id == 41898282 and .state == "CHANGES_REQUESTED") | length' \
            | uniq)

      - uses: actions/checkout@v3
        if: steps.set-blocks.outputs.blocks == ''
        with:
          fetch-depth: 0

      - name: Get changed files in the .changeset folder
        id: changed-files
        uses: tj-actions/changed-files@v29
        if: steps.set-blocks.outputs.blocks == ''
        with:
          files: |
            .changeset/**/*.md

      - name: Check if any changesets contain minor changes
        id: find-blockers
        if: steps.set-blocks.outputs.blocks == ''
        run: |
          echo "Checking for changesets marked as minor"
          echo '::set-output name=found::false'
          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
            if grep -q "'astro': minor" "$file"; then
              echo '::set-output name=found::true'
              echo "$file has a minor release tag"
            fi
          done

      - name: Add label
        if: steps.find-blockers.outputs.found == 'true'
        run: |
          curl --request POST \
            --url https://api.github.com/repos/${{github.repository}}/issues/${{github.event.number}}/labels \
            --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
            --header 'content-type: application/json' \
            -d '["semver minor"]'


      - name: Send PR review
        if: steps.find-blockers.outputs.found == 'true'
        run: | # approve the pull request
          curl --request POST \
          --url https://api.github.com/repos/${{github.repository}}/pulls/${{github.event.number}}/reviews \
          --header 'authorization: Bearer ${{ secrets.GITHUB_TOKEN }}' \
          --header 'content-type: application/json' \
          -d '{"event":"REQUEST_CHANGES","body":"This PR is blocked because it contains a `minor` changeset. A reviewer will merge this at the next release if approved."}'