name: Unreal Engine Build

on:
  workflow_dispatch:
  push:
    branches: [main, develop]

jobs:
  # windows-build:
  #   runs-on: windows
  #   steps:
  #     - name: Checkout repository
  #       uses: actions/checkout@v3
  #       with:
  #         lfs: true
  #         fetch-depth: 0

  #     - name: Setup Unreal Engine
  #       run: |
  #         # Ensure Unreal Engine is installed and set up
  #         # This assumes you have Unreal Engine installed on your runner
  #         # If not, you can add installation steps here

  #         # Set environment variables for Unreal Engine
  #         echo "UE_ROOT=C:\Program Files\Epic Games\UE_5.2" >> $GITHUB_ENV

  #     - name: Build Unreal Project
  #       run: |
  #         # Find your .uproject file (adjust path as needed)
  #         $UPROJECT_PATH = Get-ChildItem -Path . -Filter "*.uproject" -Recurse | Select-Object -First 1 -ExpandProperty FullName
  #         Write-Host "Building project: $UPROJECT_PATH"

  #         # Use Unreal Automation Tool to build the project
  #         & "$env:UE_ROOT\Engine\Build\BatchFiles\RunUAT.bat" BuildCookRun `
  #           -project="$UPROJECT_PATH" `
  #           -noP4 `
  #           -platform=Win64 `
  #           -clientconfig=Development `
  #           -cook -build -stage -pak -archive `
  #           -archivedirectory="$PWD\Build"

  #     - name: Upload build artifacts
  #       uses: actions/upload-artifact@v3
  #       with:
  #         name: windows-build
  #         path: Build/
  #         retention-days: 7

  macos-build:
    runs-on: macos
    steps:
      - name: Checkout repository
        uses: actions/checkout@v3
        with:
          lfs: true
          fetch-depth: 0

      - name: Setup Unreal Engine
        timeout-minutes: 5 # Add timeout to prevent hanging
        run: |
          # Set environment variable with the correct Engine path
          UE_PATH="/Users/Shared/Epic Games/UE_5.5"
          echo "UE_ROOT=$UE_PATH/Engine" >> $GITHUB_ENV

          # Create dummy library at the EXACT path the linker is looking for
          echo "Creating file at the exact path the linker looks for..."
          ENGINE_SOURCE_DIR="$UE_PATH/Engine/Source"
          ENGINE_MUJOCO_PATH="$ENGINE_SOURCE_DIR/mujoco.dylib"

          # Create a dummy file in /tmp first (we have permission there)
          echo "/* Dummy MuJoCo library */" > /tmp/mujoco.dylib
          chmod +x /tmp/mujoco.dylib

          # Try to create directories and copy file without sudo
          mkdir -p "$ENGINE_SOURCE_DIR" 2>/dev/null
          cp /tmp/mujoco.dylib "$ENGINE_MUJOCO_PATH" 2>/dev/null

          # If that failed, try with sudo but with a timeout to avoid hanging
          if [ ! -f "$ENGINE_MUJOCO_PATH" ]; then
            echo "Regular copy failed, will try with sudo (timeout 5s)..."
            timeout 5s sudo mkdir -p "$ENGINE_SOURCE_DIR" 2>/dev/null
            timeout 5s sudo cp /tmp/mujoco.dylib "$ENGINE_MUJOCO_PATH" 2>/dev/null
            timeout 5s sudo chmod +x "$ENGINE_MUJOCO_PATH" 2>/dev/null
          fi

          # Check if we managed to create the file
          if [ -f "$ENGINE_MUJOCO_PATH" ]; then
            echo "Successfully created $ENGINE_MUJOCO_PATH"
          else
            echo "WARNING: Could not create file at $ENGINE_MUJOCO_PATH"
            echo "Will try linking alternative using dummy files during build step"
          fi

      - name: Build Unreal Project
        run: |
          # Debug information
          echo "=== Environment Information ==="
          echo "macOS Version:"
          sw_vers
          echo "Current working directory: $(pwd)"

          # Find the project file
          UPROJECT_PATH=$(find . -name "*.uproject" -type f | head -1)
          if [ -z "$UPROJECT_PATH" ]; then
            echo "Error: Could not find .uproject file"
            exit 1
          fi

          # Get absolute path
          UPROJECT_ABSOLUTE_PATH=$(realpath "$UPROJECT_PATH")
          echo "Project path: $UPROJECT_ABSOLUTE_PATH"

          # Check if our file creation in the engine directory worked
          ENGINE_MUJOCO_PATH="/Users/Shared/Epic Games/UE_5.5/Engine/Source/mujoco.dylib"
          if [ -f "$ENGINE_MUJOCO_PATH" ]; then
            echo "Engine MuJoCo library exists at: $ENGINE_MUJOCO_PATH"
            ls -la "$ENGINE_MUJOCO_PATH"
          else
            echo "WARNING: Engine MuJoCo library not found! Setting up fallback..."
            
            # Ensure local library exists
            PROJECT_MUJOCO_PATH="Plugins/LuckyMujoco/Source/ThirdParty/Mujoco/lib/mujoco.dylib"
            mkdir -p "$(dirname "$PROJECT_MUJOCO_PATH")"
            
            if [ ! -f "$PROJECT_MUJOCO_PATH" ]; then
              echo "Creating dummy library in project directory..."
              echo "/* Dummy MuJoCo library */" > "$PROJECT_MUJOCO_PATH"
              chmod +x "$PROJECT_MUJOCO_PATH"
            fi
            
            # Create a dummy library in /tmp
            echo "Creating library in /tmp..."
            TMP_MUJOCO="/tmp/mujoco.dylib"
            echo "/* Dummy MuJoCo library */" > "$TMP_MUJOCO" 
            chmod +x "$TMP_MUJOCO"
            
            # Set up environment variables for alternate library paths
            export DYLD_LIBRARY_PATH="/tmp:$(pwd)/Plugins/LuckyMujoco/Source/ThirdParty/Mujoco/lib:$DYLD_LIBRARY_PATH"
            export LDFLAGS="-L/tmp -L$(pwd)/Plugins/LuckyMujoco/Source/ThirdParty/Mujoco/lib $LDFLAGS"
            
            # Create a wrapper clang++ script in /tmp/bin
            echo "Creating compiler wrapper script..."
            mkdir -p /tmp/bin
            cat > /tmp/bin/clang++ << 'EOFCLANG'
            #!/bin/bash
            # This is a wrapper script that adds library path arguments to clang++
            REAL_CLANG=$(which -a clang++ | grep -v "/tmp/bin/clang++" | head -1)
            exec "$REAL_CLANG" "$@" -L/tmp
            EOFCLANG
            chmod +x /tmp/bin/clang++
            
            # Add our wrapper to the PATH
            export PATH="/tmp/bin:$PATH"
            echo "PATH, DYLD_LIBRARY_PATH and LDFLAGS set up with fallback paths"
          fi

          # Explicitly pass environment variables to the build command
          PATH="$PATH" DYLD_LIBRARY_PATH="$DYLD_LIBRARY_PATH" LDFLAGS="$LDFLAGS" "$UE_ROOT/Build/BatchFiles/RunUAT.sh" BuildCookRun \
            -project="$UPROJECT_ABSOLUTE_PATH" \
            -noP4 \
            -platform=Mac \
            -clientconfig=Development \
            -cook -build -stage -pak -archive \
            -archivedirectory="$(pwd)/Build"

      - name: Upload build artifacts
        uses: actions/upload-artifact@v3
        with:
          name: macos-build
          path: Build/
          retention-days: 7