name: Notify Slack channel based on new issue label

on:
  issues:
    types: [labeled]

jobs:
  config:
    runs-on: "ubuntu-latest"
    outputs:
      has-secrets: ${{ steps.check.outputs.has-secrets }}
    steps:
      - name: "Check for secrets"
        id: check
        shell: bash
        run: |
          if [ -n "${{ (secrets.SLACK_WEBHOOK_URL != '') || '' }}" ]; then
            echo "has-secrets=1" >> "$GITHUB_OUTPUT"
          fi

  notify:
    needs: config
    if: needs.config.outputs.has-secrets
    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: Get Token
        id: get_workflow_token
        uses: peter-murray/workflow-application-token-action@v2
        with:
          application_id: ${{ secrets.APP_GRAFANA_TEAM_CHECKER_ID }}
          application_private_key: ${{ secrets.APP_GRAFANA_TEAM_CHECKER_KEY }}

      - name: "Check that issue author is not part of the team"
        if: ${{ env.TEAM != 'null' }}
        run: |
          response=$(gh api /orgs/grafana/teams/${{ env.TEAM }}/memberships/${{ github.event.issue.user.login }} -i -H "Accept: application/vnd.github.v3+json")
          STATUS_CODE=$(echo "$response" | head -n 1 | cut -d' ' -f2)
          if [ "$status_code" -eq 404 ]; then
            echo "The user was not found in the team."
            echo "USER_FOUND=false" >> $GITHUB_ENV
          else
            echo "The user was potentially found in the team"
            echo "USER_FOUND=maybe" >> $GITHUB_ENV
          fi
        env:
          GITHUB_TOKEN: ${{ steps.get_workflow_token.outputs.token }}

      - name: "Send Slack notification"
        if: ${{ (env.CHANNEL != 'null') && ((env.USER_FOUND == 'false') || (env.TEAM != 'null')) }}
        uses: slackapi/slack-github-action@v1.24.0
        with:
          payload: >
            {
              "icon_emoji": ":grafana:",
              "username": "Grafana issue labeled",
              "text": "Issue \"${{ 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 }}