name: Daily Version Bump

on:
  schedule:
    # 6pm ET (EDT = 22:00 UTC, EST = 23:00 UTC)
    - cron: "0 22 * * *"
    - cron: "0 23 * * *"
  workflow_dispatch: {}

permissions:
  contents: write

jobs:
  notify:
    runs-on: ubuntu-latest
    env:
      GH_TOKEN: ${{ github.token }}
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0
          fetch-tags: true

      - name: DST guard
        id: dst
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "Manual trigger — skipping DST guard"
            echo "skip=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          HOUR=$(TZ=America/New_York date +%H)
          if [ "$HOUR" != "18" ]; then
            echo "ET hour is $HOUR, not 18 — wrong DST rule fired"
            echo "skip=true" >> "$GITHUB_OUTPUT"
          else
            echo "skip=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Collect merged PRs since last version
        if: steps.dst.outputs.skip != 'true'
        id: changes
        run: |
          LAST_TAG=$(git tag -l 'v*' --sort=-v:refname | head -1)

          if [ -z "$LAST_TAG" ]; then
            echo "No previous version tag"
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          LAST_TAG_DATE=$(git log -1 --format=%aI "$LAST_TAG")
          PRS=$(gh pr list --state merged --json number,title,mergedAt \
            --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\")")

          if [ -z "$PRS" ]; then
            echo "No PRs merged since $LAST_TAG"
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "has_changes=true" >> "$GITHUB_OUTPUT"

          VERSION="v$(TZ=America/New_York date +%Y.%m.%d)"
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

          # Build bullet lists from PR titles
          TITLES=$(gh pr list --state merged --json number,title,mergedAt \
            --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\") | .title")

          {
            echo "slack_bullets<<ENDSLACK"
            echo "$TITLES" | sed 's/ *(#[0-9]*)//g; s/^/• /'
            echo "ENDSLACK"
          } >> "$GITHUB_OUTPUT"

          {
            echo "canvas_bullets<<ENDCANVAS"
            gh pr list --state merged --json number,title,mergedAt \
              --jq "sort_by(.number) | .[] | select(.mergedAt > \"$LAST_TAG_DATE\") | \"* \(.title) (PR #\(.number))\"" \
              | sed 's/ *(\(#[0-9]*\))\( (PR\)/ \2/; s/) (PR / (PR /'
            echo "ENDCANVAS"
          } >> "$GITHUB_OUTPUT"

      - name: Create version tag
        if: steps.changes.outputs.has_changes == 'true'
        run: |
          git tag ${{ steps.changes.outputs.version }}
          git push origin ${{ steps.changes.outputs.version }}

      - name: Update changelog canvas
        if: steps.changes.outputs.has_changes == 'true'
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
          CANVAS_ID: ${{ secrets.SLACK_CANVAS_ID }}
          SECTION_ID: ${{ secrets.SLACK_CANVAS_INTRO_SECTION }}
          VERSION: ${{ steps.changes.outputs.version }}
          CANVAS_BULLETS: ${{ steps.changes.outputs.canvas_bullets }}
        run: |
          TODAY=$(TZ=America/New_York date +%Y-%m-%d)
          MARKDOWN=$(printf "---\n\n## %s — %s\n\n%s" "$VERSION" "$TODAY" "$CANVAS_BULLETS")

          RESPONSE=$(curl -s -X POST https://slack.com/api/canvases.edit \
            -H "Authorization: Bearer $SLACK_BOT_TOKEN" \
            -H "Content-Type: application/json" \
            -d "$(jq -n \
              --arg canvas_id "$CANVAS_ID" \
              --arg section_id "$SECTION_ID" \
              --arg markdown "$MARKDOWN" \
              '{
                canvas_id: $canvas_id,
                changes: [{
                  operation: "insert_after",
                  section_id: $section_id,
                  document_content: {
                    type: "markdown",
                    markdown: $markdown
                  }
                }]
              }')")

          echo "$RESPONSE" | jq .
          if [ "$(echo "$RESPONSE" | jq -r .ok)" != "true" ]; then
            echo "::warning::Canvas update failed: $(echo "$RESPONSE" | jq -r .error)"
          fi

      - name: Post to Slack
        if: steps.changes.outputs.has_changes == 'true'
        env:
          SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }}
          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
          CANVAS_ID: ${{ secrets.SLACK_CANVAS_ID }}
          VERSION: ${{ steps.changes.outputs.version }}
          SLACK_BULLETS: ${{ steps.changes.outputs.slack_bullets }}
        run: |
          CANVAS_URL="https://app.slack.com/docs/F0B13V3EBUN"
          TEXT=$(printf "*After-Hours Scheduler has been updated to %s*\n\nHere's a brief summary of what changed:\n%s\n\n<%s|Click here to read the full changelog>" \
            "$VERSION" "$SLACK_BULLETS" "$CANVAS_URL")

          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 "$SLACK_CHANNEL_ID" --arg text "$TEXT" \
              '{channel: $channel, text: $text}')"