name: 'Setup Cache'
description: 'Sets up ccache and Bazel remote cache configuration for the build environment'
inputs:
  kernel_version:
    description: 'Kernel version (e.g., 6.1)'
    required: true
  android_version:
    description: 'Android version (e.g., android14)'
    required: true
  sublevel:
    description: 'Sublevel of kernel version (e.g., 1)'
    required: true

runs:
  using: 'composite'
  steps:
    - name: Setup ccache
      shell: bash
      if: |
        (inputs.kernel_version == '5.10' && inputs.android_version == 'android12') ||
        (inputs.kernel_version == '5.10' && inputs.android_version == 'android13') || 
        (inputs.kernel_version == '5.15' && inputs.android_version == 'android13')
      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" >> $GITHUB_ENV
        mkdir -p "$CCACHE_DIR"
        
        echo "CC=/usr/bin/ccache clang" >> "$GITHUB_ENV"
        echo "CXX=/usr/bin/ccache clang++" >> "$GITHUB_ENV"
        echo "HOSTCC=/usr/bin/ccache clang" >> "$GITHUB_ENV"
        echo "HOSTCXX=/usr/bin/ccache clang++" >> "$GITHUB_ENV"

        export CCACHE_MAXSIZE="12G"
        echo CCACHE_MAXSIZE="$CCACHE_MAXSIZE" >> $GITHUB_ENV
        export CCACHE_COMPILERCHECK="%compiler% -dumpmachine; %compiler% -dumpversion"
        echo CCACHE_COMPILERCHECK="$CCACHE_COMPILERCHECK" >> $GITHUB_ENV
        export CCACHE_BASEDIR="${{ 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="9"
        echo CCACHE_COMPRESSION_LEVEL="9" >> $GITHUB_ENV
        # Temporarily disabled for cache hit testing
        # export CCACHE_DIRECT="true"
        # echo CCACHE_DIRECT="true" >> "$GITHUB_ENV"
        # Temporarily disabled for cache hit testing
        # export CCACHE_FILE_CLONE="true"
        # echo CCACHE_FILE_CLONE="true" >> "$GITHUB_ENV"
        # Temporarily disabled for cache hit testing
        # export CCACHE_INODE_CACHE="true"
        # echo CCACHE_INODE_CACHE="true" >> "$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" >> $GITHUB_ENV
        #export CCACHE_HARDLINK="true"
        #echo CCACHE_HARDLINK="$CCACHE_HARDLINK" >> $GITHUB_ENV

        if ccache --help 2>&1 | grep -q 'depend_mode'; then
          export CCACHE_DEPEND=true
          echo "CCACHE_DEPEND=true" >> "$GITHUB_ENV"
        fi
        
        echo "=== ccache config ==="
        echo "====================="
        ccache -p
        echo "=====================

        echo "✅ ccache ready"
        echo "CCACHE_DIR: $CCACHE_DIR"

    - name: Setup Bazel Cache
      shell: bash
      if: |
        (inputs.kernel_version == '5.15' && inputs.android_version == 'android14') ||
        (inputs.kernel_version == '6.1' && inputs.android_version == 'android14') ||
        (inputs.kernel_version == '6.6' && inputs.android_version == 'android15') ||
        (inputs.kernel_version == '6.12' && inputs.android_version == 'android16')
      working-directory: ${{ github.workspace }}
      run: |
        set -euo pipefail
        export BAZEL_CACHE_DIR="/home/runner/.cache/bazel"
        echo "BAZEL_CACHE_DIR=$BAZEL_CACHE_DIR" >> $GITHUB_ENV
        mkdir -p "$BAZEL_CACHE_DIR"

        echo "✅ Bazel Cache ready"
        echo "BAZEL_CACHE_DIR: $BAZEL_CACHE_DIR"

    - name: Setup ld cache
      shell: bash
      working-directory: ${{ github.workspace }}
      run: |
        set -euo pipefail
        export LDCACHE_DIR="/home/runner/.ld_cache"
        echo "LDCACHE_DIR=$LDCACHE_DIR" >> $GITHUB_ENV
        mkdir -p "$LDCACHE_DIR"
          
        # Create LD wrapper for thin-LTO caching
        cat > "${{ github.workspace }}/kernel/common/ld-wrapper" << 'EOF'
        #!/bin/bash
        ld.lld "$@" --thinlto-cache-dir="$LDCACHE_DIR" --thinlto-jobs="$(nproc --all)"
        EOF
        chmod +x "${{ github.workspace }}/kernel/common/ld-wrapper"

        # Setup cache directories
        echo "LD=${{ github.workspace }}/kernel/common/ld-wrapper" >> "$GITHUB_ENV"
        echo "HOSTLD=${{ github.workspace }}/kernel/common/ld-wrapper" >> "$GITHUB_ENV"

        echo "✅ LD Cache ready"
        echo "LDCACHE_DIR: $LDCACHE_DIR"