daily-challenge.yml

name: Daily LeetCode Challenge

on:
  schedule:
    # Run at 00:30 UTC every day (08:30 Beijing time)
    - cron: '30 0 * * *'
  workflow_dispatch:
    inputs:
      problem_id:
        description: 'Problem ID to solve (optional)'
        required: false
        default: ''

# Prevent concurrent runs
concurrency:
  group: daily-challenge
  cancel-in-progress: false

jobs:
  solve:
    name: Solve Daily Challenge
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: write
      pull-requests: write
    
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'
      
      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y cmake build-essential ccache ninja-build just
      
      - name: Setup ccache
        uses: hendrikmuhs/ccache-action@v1.2
        with:
          # Daily challenge uses its own primary cache key
          # but can restore from CI's full build cache for faster initial builds
          key: ${{ runner.os }}-gcc-daily-challenge-${{ github.run_id }}
          restore-keys: |
            ${{ runner.os }}-gcc-daily-challenge-
            ${{ runner.os }}-gcc-full-
            ${{ runner.os }}-gcc-incremental-
            ${{ runner.os }}-gcc-
          max-size: 500M
      
      - name: Set up Python virtual environment
        run: |
          python3 -m venv venv
          source venv/bin/activate
          pip install --upgrade pip
          pip install -r requirements.txt
      
      - name: Run AI solver
        env:
          MOONSHOT_API_KEY: ${{ secrets.MOONSHOT_API_KEY }}
          AI_SOLVER_GENERATE_REPORT: 'true'
          LEETCODE_COOKIE: ${{ secrets.LEETCODE_COOKIE }}
        run: |
          source venv/bin/activate
          if [ -n "${{ github.event.inputs.problem_id }}" ]; then
            python -m script.leetcode.ai.solver ${{ github.event.inputs.problem_id }} --report
          else
            python -m script.leetcode.ai.solver --report
          fi
        continue-on-error: true
      
      - name: Get problem info
        id: get_info
        run: |
          # Check SKIP_PR flag first
          if [ -f "SKIP_PR" ]; then
            echo "should_skip=true" >> $GITHUB_OUTPUT
            echo "skip_reason=$(cat SKIP_PR)" >> $GITHUB_OUTPUT
            echo "Skipping PR creation - $(cat SKIP_PR)"
            exit 0
          else
            echo "should_skip=false" >> $GITHUB_OUTPUT
          fi
          
          REPORT_FILE=$(ls SOLUTION_REPORT_*.md 2>/dev/null | head -1)
          PROBLEM_ID=$(echo ${REPORT_FILE#SOLUTION_REPORT_} | sed 's/\.md$//')
          
          echo "problem_id=${PROBLEM_ID:-}" >> $GITHUB_OUTPUT
          echo "report_file=${REPORT_FILE:-}" >> $GITHUB_OUTPUT
          echo "has_solution=false" >> $GITHUB_OUTPUT
          
          [ -z "$REPORT_FILE" ] && echo "No solution report found" && exit 0
          
          echo "Found report: $REPORT_FILE (ID: $PROBLEM_ID)"
          
          # Check both new files (??) and modified files (M)
          SOURCE_FILE=$(git status --porcelain | grep -E '^(\?\?| M)' | grep 'src/leetcode/problems/.*\.cpp$' | awk '{print $2}' | head -1)
          HEADER_FILE=$(git status --porcelain | grep -E '^(\?\?| M)' | grep 'include/leetcode/problems/.*\.h$' | awk '{print $2}' | head -1)
          TEST_FILE=$(git status --porcelain | grep -E '^(\?\?| M)' | grep 'test/leetcode/problems/.*\.cpp$' | awk '{print $2}' | head -1)
          
          if [ -n "$SOURCE_FILE" ] && [ -n "$HEADER_FILE" ] && [ -n "$TEST_FILE" ]; then
            PROBLEM_SLUG=$(basename "$SOURCE_FILE" .cpp)
            echo "problem_slug=$PROBLEM_SLUG" >> $GITHUB_OUTPUT
            echo "has_solution=true" >> $GITHUB_OUTPUT
            echo "source_file=$SOURCE_FILE" >> $GITHUB_OUTPUT
            echo "header_file=$HEADER_FILE" >> $GITHUB_OUTPUT
            echo "test_file=$TEST_FILE" >> $GITHUB_OUTPUT
            echo "All required files found for: $PROBLEM_SLUG"
          else
            echo "Incomplete files generated"
            [ -z "$SOURCE_FILE" ] && echo "  - Missing source file"
            [ -z "$HEADER_FILE" ] && echo "  - Missing header file"
            [ -z "$TEST_FILE" ] && echo "  - Missing test file"
          fi
      
      - name: Build and test solution
        if: steps.get_info.outputs.has_solution == 'true'
        run: |
          PROBLEM_SLUG="${{ steps.get_info.outputs.problem_slug }}"
          echo "Building and testing: $PROBLEM_SLUG"
          
          mkdir -p build && cd build
          cmake .. -G Ninja \
            -DCMAKE_BUILD_TYPE=Debug \
            -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
            -DLEETCODE_SINGLE_PROBLEM="$PROBLEM_SLUG"
          cmake --build . -j
          ./bin/single_problem_test
      
      - name: Update documentation
        if: steps.get_info.outputs.has_solution == 'true'
        run: |
          # Generate updated SOLVED.md
          source venv/bin/activate
          just doc
          
          # Check if SOLVED.md was updated
          if git diff --quiet SOLVED.md 2>/dev/null; then
            echo "No changes to SOLVED.md"
          else
            echo "SOLVED.md updated"
          fi
      
      - name: Upload artifacts
        if: steps.get_info.outputs.report_file != ''
        uses: actions/upload-artifact@v4
        with:
          name: solution-problem-${{ steps.get_info.outputs.problem_id }}
          path: |
            ${{ steps.get_info.outputs.report_file }}
            ${{ steps.get_info.outputs.source_file }}
            ${{ steps.get_info.outputs.header_file }}
            ${{ steps.get_info.outputs.test_file }}
          retention-days: 7
          if-no-files-found: ignore
      
      - name: Create Pull Request
        if: steps.get_info.outputs.has_solution == 'true' && steps.get_info.outputs.should_skip != 'true' && success()
        uses: peter-evans/create-pull-request@v5
        with:
          commit-message: "feat: Add solution for LeetCode #${{ steps.get_info.outputs.problem_id }}"
          title: "🤖 Daily Challenge: Problem #${{ steps.get_info.outputs.problem_id }}"
          body-path: ${{ steps.get_info.outputs.report_file }}
          branch: daily-challenge/${{ steps.get_info.outputs.problem_id }}
          base: main
          labels: |
            daily-challenge
            ai-generated
          draft: false
          delete-branch: true
          # Include all changes: new problem files + updated SOLVED.md
          add-paths: |
            src/leetcode/problems/
            include/leetcode/problems/
            test/leetcode/problems/
            SOLVED.md