build.yml

---
name: Build

on:
  push:
  pull_request:
    branches: [main]
  workflow_dispatch:
  workflow_call:

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Set up JDK
        uses: actions/setup-java@v5
        with:
          java-version: "21"
          distribution: "temurin"
          architecture: x64

      - name: Detect Main Class
        id: detect-main
        run: |
          MAIN_FILE=$(grep -rl "public class Main" src | head -n1)
          if [ -z "$MAIN_FILE" ]; then
            echo "[ERROR]: Main.java not found"
            exit 1
          fi

          PKG=$(grep "package " "$MAIN_FILE" | awk '{print $2}' | tr -d ';')
          if [ -n "$PKG" ]; then
            MAIN_CLASS="$PKG.Main"
          else
            MAIN_CLASS="Main"
          fi

          echo "MAIN_CLASS=$MAIN_CLASS" >> $GITHUB_ENV

      - name: Build JAR
        run: |
          javac -d bin -cp "lib/*" $(find src -name "*.java");
          jar --create --file dist/app.jar --main-class="${MAIN_CLASS}" -C bin/ .

      - name: Upload JAR
        uses: actions/upload-artifact@v4
        with:
          name: app-jar-${{ github.sha }}
          path: dist/app.jar
          retention-days: 7
          if-no-files-found: error