build.yml

name: Datapack Multi-Version Build

on:
  push:
    branches: [main]
  pull_request:

jobs:
  build:
    runs-on: ubuntu-latest

    strategy:
      matrix:
        include:
          # Base format + overlay pairs — each row is a target MC version
          - label: "1_20_3"
            pack_format: 26
            overlays: "1_20_3"
          - label: "1_20_5"
            pack_format: 41
            overlays: "1_20_5"
          - label: "pre_1_21_4"
            pack_format: 48
            overlays: "_pre_1_21_4 compat_1_21_4"
          - label: "1_21_5"
            pack_format: 71
            overlays: "1_21_5"
          - label: "1_21_6"
            pack_format: 80
            overlays: "1_21_6"
          - label: "full"
            pack_format: 101
            overlays: ""

    steps:
      - uses: actions/checkout@v6

      # 🔒 Repo lock — prevent running from wrong fork
      - name: Repo lock
        run: |
          if [ "$GITHUB_REPOSITORY" != "runtoolkit/dataLib" ]; then
            echo "::error::This workflow may only run in runtoolkit/dataLib."
            exit 1
          fi

      # 📁 Prepare build directory
      - name: Prepare build directory
        run: mkdir -p build

      # 📂 Copy base layer (excluding overlay directories)
      - name: Copy base layer
        run: |
          OVERLAY_DIRS="1_20_3 1_20_5 _pre_1_21_4 compat_1_21_4 1_21_5 1_21_6 26_1"
          EXCLUDES=""
          for d in $OVERLAY_DIRS; do
            EXCLUDES="$EXCLUDES --exclude=$d"
          done
          rsync -a $EXCLUDES \
            --exclude='.git' \
            --exclude='.github' \
            --exclude='.gitattributes' \
            --exclude='.gitignore' \
            --exclude='README.md' \
            --exclude='version.json' \
            --exclude='dependencies.json' \
            ./ build/

      # 📂 Copy overlays
      - name: Copy target overlays
        run: |
          ALL_OVERLAYS="1_20_3 1_20_5 _pre_1_21_4 compat_1_21_4 1_21_5 1_21_6 26_1"
          TARGET="${{ matrix.overlays }}"

          if [ -z "$TARGET" ]; then
            # Full build: copy all overlay directories
            for d in $ALL_OVERLAYS; do
              [ -d "$d" ] && cp -r "$d" build/ || echo "::warning::Overlay '$d' not found, skipping."
            done
          else
            # Targeted build: copy only the relevant overlay(s)
            for overlay in $TARGET; do
              if [ -d "$overlay" ]; then
                cp -r "$overlay" build/
              else
                echo "::warning::Overlay '$overlay' not found, skipping."
              fi
            done
          fi

      # 🧩 pack.mcmeta — update pack_format, keep only relevant overlay entries
      - name: Patch pack.mcmeta
        run: |
          LABEL="${{ matrix.label }}"
          FORMAT="${{ matrix.pack_format }}"
          OVERLAYS="${{ matrix.overlays }}"

          # Convert overlay list to jq array (may be empty for full build)
          JQ_ARRAY="[]"
          for ov in $OVERLAYS; do
            JQ_ARRAY=$(echo "$JQ_ARRAY" | jq --arg d "$ov" '. + [$d]')
          done

          jq \
            --argjson fmt "$FORMAT" \
            --argjson keep "$JQ_ARRAY" \
            --arg label "$LABEL" \
            '
              .pack.pack_format = $fmt |
              if .overlays.entries and $label != "full" then
                .overlays.entries = [
                  .overlays.entries[] |
                  select(.directory as $d | $keep | index($d) != null)
                ]
              else . end
            ' \
            build/pack.mcmeta > build/pack.mcmeta.tmp
          mv build/pack.mcmeta.tmp build/pack.mcmeta

      # 🔍 Sanity check — is pack.mcmeta valid JSON?
      - name: Validate pack.mcmeta
        run: |
          jq empty build/pack.mcmeta && echo "pack.mcmeta is valid JSON." \
            || { echo "::error::pack.mcmeta is malformed!"; exit 1; }

      # 📦 Zip
      - name: Package datapack
        run: |
          cd build
          zip -r ../dataLib-${{ matrix.label }}.zip .
          echo "Archive size: $(du -sh ../dataLib-${{ matrix.label }}.zip | cut -f1)"

      # 🚀 Upload as artifact
      - uses: actions/upload-artifact@v6
        with:
          name: dataLib-${{ matrix.label }}
          path: dataLib-${{ matrix.label }}.zip
          retention-days: 14
          if-no-files-found: error

  # ───────────────────────────────────────────────
  # Release — only on main pushes, with full ZIP
  # ───────────────────────────────────────────────
  release:
    needs: build
    runs-on: ubuntu-latest
    if: github.event_name == 'push' && github.ref == 'refs/heads/main'

    permissions:
      contents: write

    steps:
      - uses: actions/checkout@v6

      # 🔒 Repo lock
      - name: Repo lock
        run: |
          if [ "$GITHUB_REPOSITORY" != "runtoolkit/dataLib" ]; then
            echo "::error::This workflow may only run in runtoolkit/dataLib."
            exit 1
          fi

      # 📥 Download full ZIP from artifact
      - uses: actions/download-artifact@v7
        with:
          name: dataLib-full
          path: dist/

      # 🏷️ Read version number from pack.mcmeta
      - name: Read version
        id: ver
        run: |
          # Extract version like "v5.1.1" from the description array in pack.mcmeta
          VERSION=$(jq -r '
            .pack.description |
            if type == "array" then
              .[] | select(type == "object") |
              .text // empty
            else . end |
            select(test("^\\s*\\|\\s*v[0-9]")) |
            gsub("^\\s*\\|\\s*"; "") | ltrimstr(" ")
          ' pack.mcmeta | head -1)
          # Fallback: if description is a plain string, extract directly
          if [ -z "$VERSION" ]; then
            VERSION=$(jq -r '.pack.description' pack.mcmeta | grep -oP 'v[\d.]+' | head -1)
          fi
          echo "version=${VERSION:-latest}" >> "$GITHUB_OUTPUT"

      # 🚀 Create or update GitHub Release
      - name: Create or update release
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          TAG="${{ steps.ver.outputs.version }}"
          ZIP="dist/dataLib-full.zip"

          # Delete existing tag if it exists, otherwise continue
          gh release delete "$TAG" --yes 2>/dev/null || true
          git push origin ":refs/tags/$TAG" 2>/dev/null || true

          gh release create "$TAG" \
            --title "dataLib $TAG" \
            --notes "**Full multi-version datapack build** (pack_format 101, all overlays included)." \
            --latest \
            "$ZIP#dataLib-full.zip"