name: Helpers
on:
  workflow_run:
    workflows: ["Pull Request Tests"]
    types:
      - requested
env:
  app: Accept:application/vnd.github.v3+json
  base_url: $GITHUB_API_URL/repos/$GITHUB_REPOSITORY/actions/runs
  AUTH: ${{ secrets.GITHUB_TOKEN }}
  aws_instance_id: ${{ secrets.AWS_INSTANCE_ID }}
  no_instances: 10


jobs:
  pre:
    name: Preprocess
    runs-on: ubuntu-20.04

    steps:
    - name: Share helper id
      run: echo -n ${{ github.run_id }} >~/id_file

    - uses: actions/cache@v2
      with:
        path: ~/id_file
        key: helperid-${{ github.event.workflow_run.id }}

    - name: Delete run-ci label
      run: |
        head_sha=${{ github.event.workflow_run.head_sha }}
        url=$GITHUB_API_URL/repos/$GITHUB_REPOSITORY
        pr_number=$(curl -sS -H $app $url/pulls \
          | jq -r '.[] | select(.head.sha == "'"$head_sha"'") | .number')
        echo "pr_number is $pr_number"
        curl -sS -X DELETE -H $app -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
          $url/issues/$pr_number/labels/run-ci


  repocheck:
    name: Repo check
    runs-on: ubuntu-20.04

    steps:
    - name: Check up-to-dateness and post comment
      run: |
        head_sha=${{ github.event.workflow_run.head_sha }}
        git clone -q ${{ github.event.workflow_run.head_repository.html_url }} .
        git checkout -q $head_sha
        git submodule -q update --init --recursive

        cd ${{ github.workspace }}/tests/ci
        url=$GITHUB_API_URL/repos/$GITHUB_REPOSITORY
        pr_number=$(curl -sS -H $app $url/pulls \
          | jq -r '.[] | select(.head.sha == "'"$head_sha"'") | .number')
        echo "pr_number is $pr_number"
        pr_uid=${{ github.event.workflow_run.head_repository.owner.login }}
        echo "pr_uid is $pr_uid"
        comment="$(./repo_check.sh $pr_uid 2>/dev/null)"
        echo "comment is $comment"

        if [[ -n $comment ]]; then
          curl -sS -X POST -H $app -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
            $url/issues/$pr_number/comments -d '{"body": "'"${comment}"'"}'
          echo -n "failure" >~/repocheck_file
        else
          echo -n "success" >~/repocheck_file
        fi

    - uses: actions/cache@v2
      with:
        path: ~/repocheck_file
        key: repocheck-${{ github.event.workflow_run.id }}


  startrunner:
    name: Start runners
    needs: repocheck
    runs-on: ubuntu-20.04
    outputs:
      started: ${{ steps.ec2.outputs.started }}

    steps:
    - uses: actions/checkout@v2

    - name: Check all builds are complete and successful
      id: current
      run: |
        cd ${{ github.workspace }}/tests/ci
        eval url=$base_url/${{ github.event.workflow_run.id }}/jobs
        b_r=$(echo -n $url | ./check_status.py build)
        if [ $b_r == 'success' ]; then
          echo "::set-output name=check::pass"
        elif [ $b_r == 'failure' ]; then
          echo "::set-output name=check::fail"
        fi

    - name: Check all previous runs finish using ec2
      id: previous
      if: steps.current.outputs.check == 'pass'
      run: |
        cd ${{ github.workspace }}/tests/ci
        eval url=$base_url
        echo -n $url | ./check_status.py ec2 ${{ github.run_id }}

    - uses: aws-actions/configure-aws-credentials@v1
      if: steps.current.outputs.check == 'pass'
      with:
        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        aws-region: us-east-1

    - name: Start ec2 instances
      id: ec2
      if: steps.current.outputs.check == 'pass'
      run: |
        no_stopped=0
        while [ $no_stopped -lt $no_instances ]; do
          sleep 20
          no_stopped=$(aws ec2 describe-instances --instance-ids $aws_instance_id \
            | jq -r '.Reservations[].Instances[].State.Name' | grep stopped | wc -l)
          echo "no_stopped: $no_stopped"
        done
        aws ec2 start-instances --instance-ids $aws_instance_id
        echo "::set-output name=started::yes"


  stoprunner:
    name: Stop runners
    needs: startrunner
    runs-on: ubuntu-20.04
    if: needs.startrunner.outputs.started == 'yes'

    steps:
    - uses: actions/checkout@v2

    - name: Check all tests are complete
      run: |
        cd ${{ github.workspace }}/tests/ci
        eval url=$base_url/${{ github.event.workflow_run.id }}
        echo $url | ./check_status.py test

    - uses: aws-actions/configure-aws-credentials@v1
      with:
        aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
        aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
        aws-region: us-east-1

    - name: Stop ec2 instances
      run: aws ec2 stop-instances --instance-ids $aws_instance_id