action.yml

name: Satel PR slack notifier
description: Notify devs on slack about the comments on their PR

inputs:
  SLACK_API_TOKEN:
    description: Slack token with permission users:read.email
    required: true
  SLACK_WEBHOOK_URL:
    description: Webhook for the slack app
    required: true
    
runs:
  using: "composite"
  steps:
  - name: Check event type and set variables
    id: check_event_type
    run: |
      event_type="${{ github.event_name }}"
      if [ "$event_type" == "issue_comment" ]; then
        issue_number="${{ github.event.issue.number }}"
        event_name='issues'
        username="${{ github.event.issue.user.login }}"
      else
        issue_number="${{ github.event.pull_request.number }}"
        event_name='pulls'
        username="${{ github.event.pull_request.user.login }}"
      fi
      echo "issue_number=$issue_number" >> $GITHUB_ENV
      echo "event_name=$event_name" >> $GITHUB_ENV
      echo "username=$username" >> $GITHUB_ENV
    shell: bash

  - name: Check for comment author
    id: check_comment_author
    run: |
      last_comment_author=$(gh api \
        -H "Accept: application/vnd.github+json" \
        -H "X-GitHub-Api-Version: 2022-11-28" \
        "/repos/${{ github.repository }}/${{ env.event_name }}/${{ env.issue_number }}/comments" --jq '.[-1].user.login')
      echo "last_comment_author=$last_comment_author" >> $GITHUB_ENV
      if [ "${{ env.username }}" != "$last_comment_author" ]; then
        echo "slack_trigger=true" >> $GITHUB_ENV
      fi
    env:
      GH_TOKEN: ${{ github.token }}
    shell: bash

  - name: Find slack user email
    if: env.slack_trigger == 'true'
    id: find_slack_user_email
    run: |
      # Define mapping for frontend devs
      declare -A mapping=(
          [ZoeElizabeth]=zoe@satel.ca
          [shallow-and-limited]=alex@satel.ca
          [CaseyQWood]=casey@satel.ca
      )
      github_username="${{ env.username }}"
      echo "github_username" $github_username
      slack_user_email=${mapping[$github_username]:-Unknown}
      echo "slack_user_email" $slack_user_email
      if [ "$slack_user_email" != "Unknown" ]; then
        echo "slack_user_email_found=true" >> $GITHUB_ENV
        echo "slack_user_email=$slack_user_email" >> $GITHUB_ENV
      fi
    shell: bash

  - name: Find Slack user based on the emails
    if: env.slack_user_email_found == 'true'
    id: find_slack_user
    uses: scribd/find-slack-user-action@v1.0.4
    with:
      slack-token: ${{ inputs.SLACK_API_TOKEN }}
      email: ${{ env.slack_user_email }}
      include-at-symbol: true

  - name: Get PR comment URL
    if: env.slack_user_email_found == 'true'
    id: get_comment
    run: |
      last_comment_url=$(gh api \
        -H "Accept: application/vnd.github+json" \
        -H "X-GitHub-Api-Version: 2022-11-28" \
        "/repos/${{ github.repository }}/${{ env.event_name }}/${{ env.issue_number }}/comments" --jq '.[-1].html_url')
      echo "last_comment_url=$last_comment_url" >> $GITHUB_ENV
    env:
      GH_TOKEN: ${{ github.token }}
    shell: bash

  - name: Slack notification
    if: env.slack_user_email_found == 'true'
    uses: 8398a7/action-slack@v3
    with:
      status: custom
      custom_payload: |
        {
          "blocks": [
            {
              "type": "section",
              "text": {
                "type": "mrkdwn",
                "text": "Hi ${{ steps.find_slack_user.outputs.username }}, there's a comment on your PR. Please review it. Here's the <${{ env.last_comment_url }}|link>"
              }
            }
          ]
        }
    env:
      SLACK_WEBHOOK_URL: ${{ inputs.SLACK_WEBHOOK_URL }}