name: Changelog Notification

on:
  push:
    branches: [next]
    paths:
      - 'docs/content/changelog/**.mdx'

permissions:
  contents: read

jobs:
  notify-changelog:
    name: Send Changelog Notification
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Code
        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
        with:
          fetch-depth: 0 # Fetch full history to detect changes across all commits in push

      - name: Get Changed Changelog Files
        id: changed-files
        run: |
          # Get the commit range for this push
          BEFORE="${{ github.event.before }}"
          AFTER="${{ github.event.after }}"
          
          echo "Push event details:"
          echo "  Before: $BEFORE"
          echo "  After: $AFTER"
          echo "  Commits in push: $(git rev-list --count "$BEFORE".."$AFTER" 2>/dev/null || echo "N/A")"
          
          # Handle first push to branch (before SHA is all zeros)
          if [[ "$BEFORE" =~ ^0+$ ]]; then
            echo "First push to branch detected, checking only the latest commit"
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM HEAD^..HEAD | grep '^docs/content/changelog/.*\.mdx$' || echo "")
          else
            echo "Checking all commits in push range: $BEFORE..$AFTER"
            # Get the list of added/modified changelog files across all commits in this push
            CHANGED_FILES=$(git diff --name-only --diff-filter=AM "$BEFORE".."$AFTER" | grep '^docs/content/changelog/.*\.mdx$' || echo "")
          fi
          
          if [ -z "$CHANGED_FILES" ]; then
            echo "No changelog files changed in this push"
            echo "has_changelog=false" >> $GITHUB_OUTPUT
          else
            echo "Changelog files found:"
            echo "$CHANGED_FILES"
            # Get the first changelog file (in case multiple were added)
            CHANGELOG_FILE=$(echo "$CHANGED_FILES" | head -n 1)
            echo ""
            echo "Processing changelog: $CHANGELOG_FILE"
            echo "changelog_file=$CHANGELOG_FILE" >> $GITHUB_OUTPUT
            echo "has_changelog=true" >> $GITHUB_OUTPUT
          fi

      - name: Extract Changelog Metadata
        if: steps.changed-files.outputs.has_changelog == 'true'
        id: extract-metadata
        run: |
          CHANGELOG_FILE="${{ steps.changed-files.outputs.changelog_file }}"
          
          # Extract title from frontmatter
          TITLE=$(grep "^title:" "$CHANGELOG_FILE" | sed "s/^title: *['\"]*//" | sed "s/['\"]* *$//")
          
          # Extract date from frontmatter
          DATE=$(grep "^date:" "$CHANGELOG_FILE" | sed "s/^date: *['\"]*//" | sed "s/['\"]* *$//")
          
          # Format date for URL (YYYY-MM-DD to YYYY/MM/DD)
          URL_DATE=$(echo "$DATE" | sed 's/-/\//g')
          
          # Build the changelog URL
          CHANGELOG_URL="https://docs.composio.dev/docs/changelog/${URL_DATE}"
          
          # Get the commit author who added/modified this changelog
          AUTHOR=$(git log -1 --format='%an' -- "$CHANGELOG_FILE")
          AUTHOR_EMAIL=$(git log -1 --format='%ae' -- "$CHANGELOG_FILE")
          
          # Build properly escaped JSON payload using jq
          SLACK_PAYLOAD=$(jq -n \
            --arg title "$TITLE" \
            --arg date "$DATE" \
            --arg url "$CHANGELOG_URL" \
            --arg author "$AUTHOR" \
            '{text: "*New Changelog Published*\n\n*\($title)*\n\nDate: \($date)\n<\($url)|View Changelog>\nAuthor: \($author)"}')
          
          echo "title=$TITLE" >> $GITHUB_OUTPUT
          echo "date=$DATE" >> $GITHUB_OUTPUT
          echo "url=$CHANGELOG_URL" >> $GITHUB_OUTPUT
          echo "author=$AUTHOR" >> $GITHUB_OUTPUT
          echo "author_email=$AUTHOR_EMAIL" >> $GITHUB_OUTPUT
          
          # Save the JSON payload for the next step
          echo "slack_payload<<EOF" >> $GITHUB_OUTPUT
          echo "$SLACK_PAYLOAD" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT
          
          echo "📝 Changelog Title: $TITLE"
          echo "📅 Date: $DATE"
          echo "🔗 URL: $CHANGELOG_URL"
          echo "👤 Author: $AUTHOR ($AUTHOR_EMAIL)"

      - name: Send Slack Notification
        if: steps.changed-files.outputs.has_changelog == 'true'
        uses: slackapi/slack-github-action@45a88b9581bfab2566dc881e2cd66d334e621e2c # v3.0.3
        with:
          webhook: ${{ secrets.SLACK_CUSTOMER_COMMS_WEBHOOK_URL }}
          webhook-type: incoming-webhook
          payload: ${{ steps.extract-metadata.outputs.slack_payload }}