name: Optimized CI

on:
  pull_request:
  push:
    branches:
      - main
      - 'feature/**'

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  backend-lint:
    name: "Backend Checkstyle & Tests"
    container:
      image: "cimg/openjdk:23.0-node"
    steps:
      - name: "Checkout"
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      
      - name: "Cache Gradle dependencies"
        uses: https://github.com/actions/cache@v4
        with:
          path: |
            ~/.gradle/caches
            ~/.gradle/wrapper
            backend/.gradle
          key: gradle-${{ runner.os }}-${{ hashFiles('backend/build.gradle.kts', 'backend/gradle/wrapper/gradle-wrapper.properties') }}
          restore-keys: |
            gradle-${{ runner.os }}-
      
      - name: "Setup Gradle"
        working-directory: ./backend
        run: chmod +x ./gradlew
      
      - name: "Run Checkstyle"
        working-directory: ./backend
        run: ./gradlew checkstyleMain checkstyleTest --parallel --build-cache
      
      - name: "Run Tests"
        working-directory: ./backend
        run: ./gradlew test --parallel --build-cache
      
      - name: "Upload Test Results"
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: backend-test-results
          path: backend/build/reports/tests/
          retention-days: 7
      
      - name: "Stop Gradle"
        if: always()
        working-directory: ./backend
        run: ./gradlew --stop

  backend-build:
    name: "Backend Build & Package"
    needs: backend-lint
    container:
      image: "cimg/openjdk:23.0-node"
    steps:
      - name: "Checkout"
        uses: actions/checkout@v4
      
      - name: "Cache Gradle dependencies"
        uses: https://github.com/actions/cache@v4
        with:
          path: |
            ~/.gradle/caches
            ~/.gradle/wrapper
            backend/.gradle
          key: gradle-${{ runner.os }}-${{ hashFiles('backend/build.gradle.kts', 'backend/gradle/wrapper/gradle-wrapper.properties') }}
          restore-keys: |
            gradle-${{ runner.os }}-
      
      - name: "Setup Gradle"
        working-directory: ./backend
        run: chmod +x ./gradlew
      
      - name: "Build JAR"
        working-directory: ./backend
        run: ./gradlew bootJar --parallel --build-cache
      
      - name: "Upload Artifacts"
        uses: actions/upload-artifact@v4
        with:
          name: backend-jar
          path: backend/build/libs/*.jar
          retention-days: 5
      
      - name: "Stop Gradle"
        if: always()
        working-directory: ./backend
        run: ./gradlew --stop

  frontend-lint:
    name: "Frontend Lint & Format"
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: "Checkout Code"
        uses: actions/checkout@v4
      
      - name: "Install Bun"
        uses: oven-sh/setup-bun@v2
        with:
          bun-version: latest
      
      - name: "Cache Dependencies"
        uses: actions/cache@v4
        with:
          path: frontend/node_modules
          key: ${{ runner.os }}-bun-${{ hashFiles('frontend/bun.lock') }}
          restore-keys: |
            ${{ runner.os }}-bun-
      
      - name: "Install dependencies"
        working-directory: ./frontend
        run: bun install --frozen-lockfile
      
      - name: "Run ESLint"
        working-directory: ./frontend
        run: bun run lint
      
      - name: "Run Prettier Check"
        working-directory: ./frontend
        run: bun run format:check

  frontend-test:
    name: "Frontend Tests"
    needs: frontend-lint
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: "Checkout Code"
        uses: actions/checkout@v4
      
      - name: "Install Bun"
        uses: oven-sh/setup-bun@v2
        with:
          bun-version: latest
      
      - name: "Cache Dependencies"
        uses: actions/cache@v4
        with:
          path: frontend/node_modules
          key: ${{ runner.os }}-bun-${{ hashFiles('frontend/bun.lock') }}
          restore-keys: |
            ${{ runner.os }}-bun-
      
      - name: "Install dependencies"
        working-directory: ./frontend
        run: bun install --frozen-lockfile
      
      - name: "Run Tests"
        working-directory: ./frontend
        run: bun run test --no-watch --browsers=ChromeHeadless
      
      - name: "Upload Test Results"
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: frontend-test-results
          path: frontend/coverage/
          retention-days: 7

  frontend-build:
    name: "Frontend Build"
    needs: frontend-test
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: "Checkout Code"
        uses: actions/checkout@v4
      
      - name: "Install Bun"
        uses: oven-sh/setup-bun@v2
        with:
          bun-version: latest
      
      - name: "Cache Dependencies"
        uses: actions/cache@v4
        with:
          path: frontend/node_modules
          key: ${{ runner.os }}-bun-${{ hashFiles('frontend/bun.lock') }}
          restore-keys: |
            ${{ runner.os }}-bun-
      
      - name: "Cache Build"
        uses: actions/cache@v4
        with:
          path: frontend/dist
          key: ${{ runner.os }}-dist-${{ github.sha }}
          restore-keys: |
            ${{ runner.os }}-dist-
      
      - name: "Install dependencies"
        working-directory: ./frontend
        run: bun install --frozen-lockfile
      
      - name: "Production Build"
        working-directory: ./frontend
        run: bun run build --configuration production
      
      - name: "Upload Build Artifacts"
        uses: actions/upload-artifact@v4
        with:
          name: frontend-build
          path: frontend/dist/
          retention-days: 5

  pr-analysis:
    name: "PR Quality Analysis"
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    needs: [backend-build, frontend-build]
    steps:
      - name: "Checkout Code"
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      
      - name: "Setup Node.js"
        uses: actions/setup-node@v4
        with:
          node-version: 20
      
      - name: "Code Size Analysis"
        run: |
          echo "### PR Size Analysis :mag:" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Metric | Value |" >> $GITHUB_STEP_SUMMARY
          echo "| --- | --- |" >> $GITHUB_STEP_SUMMARY
          echo "| Files changed | $(git diff --name-only origin/${{ github.base_ref }} | wc -l) |" >> $GITHUB_STEP_SUMMARY
          echo "| Lines added | $(git diff --stat origin/${{ github.base_ref }} | tail -n 1 | awk '{print $4}') |" >> $GITHUB_STEP_SUMMARY
          echo "| Lines removed | $(git diff --stat origin/${{ github.base_ref }} | tail -n 1 | awk '{print $6}') |" >> $GITHUB_STEP_SUMMARY
      
      - name: "PR Summary"
        run: |
          echo "### PR Summary :clipboard:" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "#### Modified Files by Type" >> $GITHUB_STEP_SUMMARY
          echo "| File Type | Count |" >> $GITHUB_STEP_SUMMARY
          echo "| --- | --- |" >> $GITHUB_STEP_SUMMARY
          echo "| Java (.java) | $(git diff --name-only origin/${{ github.base_ref }} | grep "\.java$" | wc -l) |" >> $GITHUB_STEP_SUMMARY
          echo "| TypeScript (.ts) | $(git diff --name-only origin/${{ github.base_ref }} | grep "\.ts$" | wc -l) |" >> $GITHUB_STEP_SUMMARY
          echo "| HTML (.html) | $(git diff --name-only origin/${{ github.base_ref }} | grep "\.html$" | wc -l) |" >> $GITHUB_STEP_SUMMARY
          echo "| CSS/SCSS (.css/.scss) | $(git diff --name-only origin/${{ github.base_ref }} | grep -E "\.(css|scss)$" | wc -l) |" >> $GITHUB_STEP_SUMMARY
          echo "| Configuration files | $(git diff --name-only origin/${{ github.base_ref }} | grep -E "\.(json|yml|yaml|properties|xml|gradle|kts)$" | wc -l) |" >> $GITHUB_STEP_SUMMARY
      
      - name: "Add Test Analysis"
        run: |
          echo "### Test Coverage Impact :test_tube:" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Component | Status |" >> $GITHUB_STEP_SUMMARY
          echo "| --- | --- |" >> $GITHUB_STEP_SUMMARY
          
          JAVA_FILES=$(git diff --name-only origin/${{ github.base_ref }} | grep "\.java$" | wc -l)
          JAVA_TEST_FILES=$(git diff --name-only origin/${{ github.base_ref }} | grep "Test\.java$" | wc -l)
          
          TS_FILES=$(git diff --name-only origin/${{ github.base_ref }} | grep "\.ts$" | grep -v "\.spec\.ts$" | wc -l)
          TS_TEST_FILES=$(git diff --name-only origin/${{ github.base_ref }} | grep "\.spec\.ts$" | wc -l)
          
          if [ $JAVA_FILES -gt 0 ] && [ $JAVA_TEST_FILES -eq 0 ]; then
            echo "| Backend | ⚠️ Java code changes without test updates |" >> $GITHUB_STEP_SUMMARY
          elif [ $JAVA_FILES -gt 0 ] && [ $JAVA_TEST_FILES -gt 0 ]; then
            echo "| Backend | ✅ Java code changes with test updates |" >> $GITHUB_STEP_SUMMARY
          elif [ $JAVA_FILES -eq 0 ]; then
            echo "| Backend | ➖ No Java code changes |" >> $GITHUB_STEP_SUMMARY
          fi
          
          if [ $TS_FILES -gt 0 ] && [ $TS_TEST_FILES -eq 0 ]; then
            echo "| Frontend | ⚠️ TypeScript code changes without test updates |" >> $GITHUB_STEP_SUMMARY
          elif [ $TS_FILES -gt 0 ] && [ $TS_TEST_FILES -gt 0 ]; then
            echo "| Frontend | ✅ TypeScript code changes with test updates |" >> $GITHUB_STEP_SUMMARY
          elif [ $TS_FILES -eq 0 ]; then
            echo "| Frontend | ➖ No TypeScript code changes |" >> $GITHUB_STEP_SUMMARY
          fi

  merge-readiness:
    name: "Merge Readiness Check"
    needs: [backend-lint, backend-build, frontend-lint, frontend-test, frontend-build]
    if: github.event_name == 'pull_request'
    runs-on: ubuntu-latest
    steps:
      - name: "Merge Status"
        run: |
          echo "### PR Readiness Status :rocket:" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Check | Status |" >> $GITHUB_STEP_SUMMARY
          echo "| --- | --- |" >> $GITHUB_STEP_SUMMARY
          echo "| Backend Checkstyle | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "| Backend Tests | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "| Backend Build | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "| Frontend Lint | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "| Frontend Tests | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "| Frontend Build | ✅ Passed |" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ **This PR is ready to merge!**" >> $GITHUB_STEP_SUMMARY