name: 'Build Kernel'
description: 'Builds kernel using legacy build.sh or Bazel (kleaf)'

runs:
  using: composite
  steps:
    - name: 'Setup ccache and Build Environment'
      shell: bash
      working-directory: ${{ github.workspace }}
      run: |
        set -euo pipefail
        
        # Download and install ccache
        echo "Installing ccache..."
        curl -LfsS --retry 5 --retry-delay 5 --retry-all-errors --connect-timeout 30 --tcp-fastopen -H "User-Agent: Mozilla/5.0" "https://github.com/WildKernels/kernel_patches/raw/refs/heads/main/ccache/ccache-x86-64" -o ccache || { echo "❌ Failed to download ccache"; exit 1; }
        sudo cp -f ./ccache /usr/bin/ccache || { echo "❌ Failed to install ccache"; exit 1; }
        sudo chmod +x /usr/bin/ccache
        rm -f ./ccache
        
        # Verify ccache
        if ! /usr/bin/ccache --version > /dev/null 2>&1; then
          echo "❌ ccache installation failed or binary is corrupted"
          exit 1
        fi
        echo "✅ ccache binary verified: $(/usr/bin/ccache --version | head -1)"
        
        # Setup cache directories
        export CCACHE_DIR="/home/runner/.ccache"
        echo "CCACHE_DIR=$CCACHE_DIR" >> $GITHUB_ENV
        export LDCACHE_DIR="/home/runner/.ld_cache"
        echo "LDCACHE_DIR=$LDCACHE_DIR" >> $GITHUB_ENV
        mkdir -p "$CCACHE_DIR" "$LDCACHE_DIR"
        
        # Create LD wrapper for thin-LTO caching
        cat > "$GITHUB_WORKSPACE/kernel/ld-wrapper" << 'EOF'
        #!/bin/bash
        ld.lld "$@" --thinlto-cache-dir="$LDCACHE_DIR" --thinlto-jobs="$(nproc --all)"
        EOF
        chmod +x "$GITHUB_WORKSPACE/kernel/ld-wrapper"

        # Setup ccache compiler wrappers in PATH (masquerade method)
        # This intercepts compiler invocations regardless of how the build system calls them
        #mkdir -p "$GITHUB_WORKSPACE/ccache-bin"
        #cp /usr/bin/ccache "$GITHUB_WORKSPACE/ccache-bin/clang"
        #cp /usr/bin/ccache "$GITHUB_WORKSPACE/ccache-bin/clang++"
        #cp /usr/bin/ccache "$GITHUB_WORKSPACE/ccache-bin/gcc"
        #cp /usr/bin/ccache "$GITHUB_WORKSPACE/ccache-bin/g++"
        #cp /usr/bin/ccache "$GITHUB_WORKSPACE/ccache-bin/ld.lld"
        #chmod +x "$GITHUB_WORKSPACE/ccache-bin"/*
        
        # Export environment variables for subsequent steps
        #echo "PATH=$GITHUB_WORKSPACE/ccache-bin:$PATH" >> $GITHUB_ENV
        
        export CC="/usr/bin/ccache clang"
        echo "CC=/usr/bin/ccache clang" >> $GITHUB_ENV
        export CXX="/usr/bin/ccache clang++"
        echo "CXX=/usr/bin/ccache clang++" >> $GITHUB_ENV
        export HOSTCC="/usr/bin/ccache clang"
        echo "HOSTCC=/usr/bin/ccache clang" >> $GITHUB_ENV
        export HOSTCXX="/usr/bin/ccache clang++"
        echo "HOSTCXX=/usr/bin/ccache clang++" >> $GITHUB_ENV
        export LD="$GITHUB_WORKSPACE/kernel/ld-wrapper"
        echo "LD=$GITHUB_WORKSPACE/kernel/ld-wrapper" >> $GITHUB_ENV

        #echo "HOSTLD=$GITHUB_WORKSPACE/kernel/ld-wrapper" >> $GITHUB_ENV
        #echo "CLANG_PREBUILT_BIN=$GITHUB_WORKSPACE/ccache-bin" >> $GITHUB_ENV


        export CCACHE_MAXSIZE="12G"
        echo CCACHE_MAXSIZE="12G" >> $GITHUB_ENV
        export CCACHE_COMPILERCHECK="content"
        echo CCACHE_COMPILERCHECK="content" >> $GITHUB_ENV
        export CCACHE_BASEDIR="${GITHUB_WORKSPACE}"
        echo CCACHE_BASEDIR="${GITHUB_WORKSPACE}" >> $GITHUB_ENV
        export CCACHE_NOHASHDIR="true"
        echo CCACHE_NOHASHDIR="true" >> $GITHUB_ENV
        export CCACHE_IGNOREOPTIONS="--sysroot*"
        echo CCACHE_IGNOREOPTIONS="--sysroot*" >> $GITHUB_ENV
        export CCACHE_COMPRESSION="true"
        echo CCACHE_COMPRESSION="true" >> $GITHUB_ENV
        export CCACHE_COMPRESSLEVEL="3"
        echo CCACHE_COMPRESSION_LEVEL="3" >> $GITHUB_ENV
        export CCACHE_DIRECT="true"
        echo CCACHE_DIRECT="true" >> $GITHUB_ENV
        export CCACHE_FILE_CLONE="true"
        echo CCACHE_FILE_CLONE="true" >> $GITHUB_ENV
        export CCACHE_INODE_CACHE="true"
        echo CCACHE_INODE_CACHE="true" >> $GITHUB_ENV
        export CCACHE_IS_KERNEL_COMPILING="true"
        echo CCACHE_IS_KERNEL_COMPILING="true" >> $GITHUB_ENV
        export CCACHE_UMASK="002"
        echo CCACHE_UMASK="002" >> $GITHUB_ENV
        export CCACHE_SLOPPINESS="file_macro,time_macros,include_file_mtime,include_file_ctime,pch_defines,system_headers,locale"
        echo CCACHE_SLOPPINESS="file_macro,time_macros,include_file_mtime,include_file_ctime,pch_defines,system_headers,locale" >> $GITHUB_ENV
        
        if ccache --help 2>&1 | grep -q 'depend_mode'; then
          export CCACHE_DEPEND=true
          echo "CCACHE_DEPEND=true" >> "$GITHUB_ENV"
        fi
        
        # Initialize ccache
        #ccache -M 100G
        ccache -p
        ccache -s
        ccache -z
        
        echo "✅ Build environment ready"
        echo "   CCACHE_DIR: $CCACHE_DIR"
        echo "   LDCACHE_DIR: $LDCACHE_DIR"
        echo "   Compiler wrappers: $GITHUB_WORKSPACE/ccache-bin"

    - name: 'Build Kernel'
      shell: bash
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail
        if [ -f "build/build.sh" ]; then
          SKIP_MRPROPER=1 \
          LTO=thin \
          SKIP_VENDOR_BOOT=1 \
          SKIP_EXT_MODULES=1 \
          SKIP_CP_KERNEL_HDR=1 \
          GKI_DEFCONFIG_FRAGMENT="$GITHUB_WORKSPACE/wild_gki.fragment" \
          BUILD_CONFIG=common/build.config.gki.aarch64 \
          CCACHE_DIR="$CCACHE_DIR" \
          LD="$LD" \
          LDCACHE_DIR="$LDCACHE_DIR" \
          #CLANG_PREBUILT_BIN="$CLANG_PREBUILT_BIN" \
          #PATH="$PATH" \
          build/build.sh -j"$(nproc)"
        else
          cp "$GITHUB_WORKSPACE/wild_gki.fragment" common/arch/arm64/configs/wild_gki.fragment
          tools/bazel build --config=release --notrim --defconfig_fragment=//common:arch/arm64/configs/wild_gki.fragment --disk_cache=$LDCACHE_DIR --cache_dir=$GITHUB_WORKSPACE/kernel/.cache/bazel //common:kernel_aarch64
        fi
        
    - name: 'Report Cache Sizes'
      shell: bash
      working-directory: ${{ github.workspace }}/kernel/common
      run: |
        set -euo pipefail
        echo "📊 Cache sizes after build:"
        echo "   CCACHE usage:"
        du -sh "$CCACHE_DIR" || echo "   (no ccache directory)"
        echo "   LDCACHE usage:"
        du -sh "$LDCACHE_DIR" || echo "   (no ldcache directory)"
        
        echo "Perform cache eviction!"
        # 3h = 10800s using seconds to support older ccache
        ccache --evict-older-than 10800s