name: Deploy Notification

on:
  push:
    branches: [main]

jobs:
  notify:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 2

      - name: Extract version info from commit
        id: info
        run: |
          MSG=$(git log -1 --pretty=%s)
          echo "message=$MSG" >> "$GITHUB_OUTPUT"
          # Count merge commits on main as version number
          COUNT=$(git rev-list --count HEAD)
          echo "count=$COUNT" >> "$GITHUB_OUTPUT"

      - name: Post to Slack
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
        run: |
          curl -s -X POST https://slack.com/api/chat.postMessage \
            -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
            -H "Content-Type: application/json" \
            -d "$(jq -n \
              --arg channel "$SLACK_CHANNEL_ID" \
              --arg text ":rocket: *Deployed to production* — ${{ steps.info.outputs.message }}" \
              '{channel: $channel, text: $text}')"