name: Notify Slack channel based on new issue label

on:
  issues:
    types: [labeled]

jobs:
  notify:
    runs-on: ubuntu-latest
    steps:
      - name: "Download teams.yml to know which label is for which team"
        run: wget https://raw.githubusercontent.com/grafana/grafana/main/.github/teams.yml

      - name: "Determine which team to notify"
        run: |
          # Default to null values.
          CHANNEL="null"
          TEAM="null"

          echo "${{ github.event.label.name }} label added"
          export CURRENT_LABEL="${{ github.event.label.name }}" # Enable the use of the label in yq evaluations
          # yq is installed by default in ubuntu-latest
          if [[ $(yq e 'keys | .[] | select(. == env(CURRENT_LABEL))' teams.yml ) ]]; then
            # Check if we have a channel set to notify on comments.
            if [[ $(yq '.[env(CURRENT_LABEL)] | has("channel-label")' teams.yml ) == true ]]; then
              CHANNEL=$(yq '.[env(CURRENT_LABEL)].channel-label' teams.yml)
              echo "Ready to send issue to channel ID ${CHANNEL}"
            fi

            if [[ $(yq '.[env(CURRENT_LABEL)] | has("exclude-github-team")' teams.yml ) == true ]]; then
              TEAM=$(yq '.[env(CURRENT_LABEL)].exclude-github-team' teams.yml)
              echo "Will not send issue to channel if issue author is part of the team ${TEAM}"
            fi
          fi

          # set environment for next steps
          echo "CHANNEL=${CHANNEL}" >> $GITHUB_ENV
          echo "TEAM=${TEAM}" >> $GITHUB_ENV

      - name: "Prepare payload"
        uses: frabert/replace-string-action@v2.0
        id: preparePayload
        with:
          # replace double quotes with single quotes to avoid breaking the JSON payload sent to Slack
          string: ${{ github.event.issue.title }}
          pattern: '"'
          replace-with: "'"
          flags: 'g'

      - name: "Check that issue author is not part of the team"
        if: ${{ env.TEAM != 'null' }}
        uses: tspascoal/get-user-teams-membership@v2
        id: checkUserMember
        with:
          username: ${{ github.event.issue.user.login }}
          team: "${{ env.TEAM }}"
          GITHUB_TOKEN: ${{ secrets.GH_BOT_ACCESS_TOKEN }}

      - name: "Send Slack notification"
        if: ${{ (env.CHANNEL != 'null') && ((steps.checkUserMember.outputs.isTeamMember == 'false') || (env.TEAM != 'null')) }}
        uses: slackapi/slack-github-action@v1.24.0
        with:
          payload: >
            {
              "icon_emoji": ":grafana:",
              "username": "Grafana issue labeled",
              "text": "Issue \"${{ steps.preparePayload.outputs.replaced }}\" labeled \"${{ github.event.label.name }}\": ${{ github.event.issue.html_url }}, please triage.",
              "channel": "${{ env.CHANNEL }}"
            }
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}