name: Update README with ADR Index

on:
  push:
    branches:
      - main
    paths:
      - 'decisions/**.md'
      - '.gitea/workflows/update-adr-readme.yaml'
  workflow_dispatch:

jobs:
  update-readme:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 1

      - name: Generate ADR table and update README
        run: |
          set -euo pipefail

          TABLE_HEADER="| # | Decision | Status | Date |"
          TABLE_SEPARATOR="|---|----------|--------|------|"
          TABLE_ROWS=""
          TOTAL=0
          ACCEPTED=0
          PROPOSED=0
          SUPERSEDED=0
          DEPRECATED=0

          for file in decisions/[0-9][0-9][0-9][0-9]-*.md; do
            [ -f "$file" ] || continue

            # Extract ADR number from filename
            num=$(basename "$file" | grep -oP '^\d+')

            # Skip the template
            [ "$num" = "0000" ] && continue

            # Parse title from first heading line
            title=$(head -1 "$file" | sed 's/^#\s*//')

            # Parse status: "* Status: accepted"
            status=$(grep -m1 -iP '^\*\s*Status:\s*' "$file" \
              | sed 's/^\*\s*Status:\s*//i' | xargs)

            # Parse date: "* Date: 2026-02-04"
            date=$(grep -m1 -iP '^\*\s*Date:\s*' "$file" \
              | sed 's/^\*\s*Date:\s*//i' | xargs)

            # Status emoji
            case "$(echo "$status" | tr '[:upper:]' '[:lower:]')" in
              accepted)     badge="✅" ; ACCEPTED=$((ACCEPTED+1)) ;;
              proposed)     badge="📝" ; PROPOSED=$((PROPOSED+1)) ;;
              superseded*)  badge="♻️"  ; SUPERSEDED=$((SUPERSEDED+1)) ;;
              deprecated)   badge="⛔" ; DEPRECATED=$((DEPRECATED+1)) ;;
              *)            badge="❓" ;;
            esac

            TOTAL=$((TOTAL+1))
            TABLE_ROWS="${TABLE_ROWS}| ${num} | [${title}](${file}) | ${badge} ${status} | ${date} |\n"
          done

          # Build the full table block
          ADR_TABLE=$(printf '%s\n%s\n%s' "$TABLE_HEADER" "$TABLE_SEPARATOR" "$(echo -e "$TABLE_ROWS")")

          # Build badge line (shields.io static badge)
          BADGE_LINE="![ADR Count](https://img.shields.io/badge/ADRs-${TOTAL}_total-blue?logo=bookstack) ![Accepted](https://img.shields.io/badge/accepted-${ACCEPTED}-brightgreen) ![Proposed](https://img.shields.io/badge/proposed-${PROPOSED}-yellow)"

          # Replace the ADR badges marker
          if grep -q '<!-- ADR-BADGES-START -->' README.md; then
            sed -i '/<!-- ADR-BADGES-START -->/,/<!-- ADR-BADGES-END -->/c\<!-- ADR-BADGES-START -->\n'"${BADGE_LINE}"'\n<!-- ADR-BADGES-END -->' README.md
          else
            echo "::warning::Missing <!-- ADR-BADGES-START --> marker in README.md"
          fi

          # Replace the ADR table marker
          if grep -q '<!-- ADR-TABLE-START -->' README.md; then
            # Use awk to replace content between markers (handles multi-line)
            awk -v table="$ADR_TABLE" '
              /<!-- ADR-TABLE-START -->/ { print; print table; skip=1; next }
              /<!-- ADR-TABLE-END -->/   { skip=0 }
              !skip { print }
            ' README.md > README.md.tmp && mv README.md.tmp README.md
          else
            echo "::warning::Missing <!-- ADR-TABLE-START --> marker in README.md"
          fi

          # Update the "Last updated" date
          TODAY=$(date +%Y-%m-%d)
          sed -i "s|^\*Last updated:.*\*$|*Last updated: ${TODAY}*|" README.md

      - name: Check for changes
        id: changes
        run: |
          git diff --quiet README.md && echo "changed=false" >> "$GITHUB_OUTPUT" || echo "changed=true" >> "$GITHUB_OUTPUT"

      - name: Commit and push
        if: steps.changes.outputs.changed == 'true'
        run: |
          git config user.name "Gitea Actions"
          git config user.email "actions@daviestechlabs.io"
          git add README.md
          git commit -m "docs: auto-update ADR index in README [skip ci]"
          git push