# common logic across linux and darwin

init_vars() {
    case "${GOARCH}" in
    "amd64")
        ARCH="x86_64"
        ;;
    "arm64")
        ARCH="arm64"
        ;;
    *)
        echo "GOARCH must be set"
        echo "this script is meant to be run from within go generate"
        exit 1
        ;;
    esac

    LLAMACPP_DIR=../llama.cpp
    CMAKE_DEFS="-DCMAKE_SKIP_RPATH=on"
    CMAKE_TARGETS="--target ollama_llama_server"
    if echo "${CGO_CFLAGS}" | grep -- '-g' >/dev/null; then
        CMAKE_DEFS="-DCMAKE_BUILD_TYPE=RelWithDebInfo -DCMAKE_VERBOSE_MAKEFILE=on -DLLAMA_GPROF=on -DLLAMA_SERVER_VERBOSE=on ${CMAKE_DEFS}"
    else
        # TODO - add additional optimization flags...
        CMAKE_DEFS="-DCMAKE_BUILD_TYPE=Release -DLLAMA_SERVER_VERBOSE=off ${CMAKE_DEFS}"
    fi
    case $(uname -s) in
    "Darwin")
        LIB_EXT="dylib"
        WHOLE_ARCHIVE="-Wl,-force_load"
        NO_WHOLE_ARCHIVE=""
        GCC_ARCH="-arch ${ARCH}"
        DIST_BASE=../../dist/darwin-${GOARCH}/
        ;;
    "Linux")
        LIB_EXT="so"
        WHOLE_ARCHIVE="-Wl,--whole-archive"
        NO_WHOLE_ARCHIVE="-Wl,--no-whole-archive"

        # Cross compiling not supported on linux - Use docker
        GCC_ARCH=""
        DIST_BASE=../../dist/linux-${GOARCH}/
        ;;
    *)
        ;;
    esac
    if [ -z "${CMAKE_CUDA_ARCHITECTURES}" ] ; then
        CMAKE_CUDA_ARCHITECTURES="50;52;61;70;75;80"
    fi
    GZIP=$(which pigz 2>/dev/null || echo "gzip")
}

git_module_setup() {
    if [ -n "${OLLAMA_SKIP_PATCHING}" ]; then
        echo "Skipping submodule initialization"
        return
    fi
    # Make sure the tree is clean after the directory moves
    if [ -d "${LLAMACPP_DIR}/gguf" ]; then
        echo "Cleaning up old submodule"
        rm -rf ${LLAMACPP_DIR}
    fi
    git submodule init
    git submodule update --force ${LLAMACPP_DIR}

}

apply_patches() {
    # Wire up our CMakefile
    if ! grep ollama ${LLAMACPP_DIR}/CMakeLists.txt; then
        echo 'add_subdirectory(../ext_server ext_server) # ollama' >>${LLAMACPP_DIR}/CMakeLists.txt
    fi

    if [ -n "$(ls -A ../patches/*.diff)" ]; then
        # apply temporary patches until fix is upstream
        for patch in ../patches/*.diff; do
            for file in $(grep "^+++ " ${patch} | cut -f2 -d' ' | cut -f2- -d/); do
                (cd ${LLAMACPP_DIR}; git checkout ${file})
            done
        done
        for patch in ../patches/*.diff; do
            (cd ${LLAMACPP_DIR} && git apply ${patch})
        done
    fi
}

build() {
    cmake -S ${LLAMACPP_DIR} -B ${BUILD_DIR} ${CMAKE_DEFS}
    cmake --build ${BUILD_DIR} ${CMAKE_TARGETS} -j8
    # remove unnecessary build artifacts
    rm -f ${BUILD_DIR}/bin/ggml-common.h ${BUILD_DIR}/bin/ggml-metal.metal
}

compress() {
    echo "Compressing payloads to reduce overall binary size..."
    rm -rf ${BUILD_DIR}/bin/*.gz
    for f in ${BUILD_DIR}/bin/* ; do
        ${GZIP} -n --best -f ${f} &
        compress_pids+=" $!"
    done
    # check for lib directory
    if [ -d ${BUILD_DIR}/lib ]; then
        for f in ${BUILD_DIR}/lib/* ; do
            ${GZIP} -n --best -f ${f} &
            compress_pids+=" $!"
        done
    fi
    echo
}

wait_for_compress() {
    for pid in ${compress_pids}; do
        wait $pid
    done
    echo "Finished compression"
}

install() {
    echo "Installing libraries to bin dir ${BUILD_DIR}/bin/"
    for lib in $(find ${BUILD_DIR} -name \*.${LIB_EXT}); do
        rm -f "${BUILD_DIR}/bin/$(basename ${lib})"
        cp -af "${lib}" "${BUILD_DIR}/bin/"
    done
}

# Keep the local tree clean after we're done with the build
cleanup() {
    (cd ${LLAMACPP_DIR}/ && git checkout CMakeLists.txt)

    if [ -n "$(ls -A ../patches/*.diff)" ]; then
        for patch in ../patches/*.diff; do
            for file in $(grep "^+++ " ${patch} | cut -f2 -d' ' | cut -f2- -d/); do
                (cd ${LLAMACPP_DIR}; git checkout ${file})
            done
        done
    fi
}
