#!/bin/bash

this_dir="$( cd "$( dirname "${BASH_SOURCE[0]}"  )" >/dev/null 2>&1 && pwd )"
occlum_dir="$( cd "$( dirname "$this_dir/../../../"  )" >/dev/null 2>&1 && pwd )"

if [ -z $OCCLUM_INSTANCE_DIR ];then
    OCCLUM_INSTANCE_DIR=".occlum"
fi
working_dir=`pwd`
context_dir="$working_dir/$OCCLUM_INSTANCE_DIR"

SGX_SDK="${SGX_SDK:-/opt/intel/sgxsdk}"
SGX_GDB="$SGX_SDK/bin/sgx-gdb"
ENCLAVE_SIGN_TOOL="$SGX_SDK/bin/x64/sgx_sign"
ENCLAVE_SIGN_KEY="$occlum_dir/etc/template/Enclave.pem"

exit_error() {
    echo "Error: $@" >&2
    exit 1
}

report_arg_error() {
    echo $1 >&2
    echo ""
    cat <<EOF
Usage:
    occlum init
        Initialize a directory as the Occlum context

    occlum build [--sign-key <key_path>] [--sign-tool <tool_path>]
        Generate a secure Occlum FS image and Occlum SGX enclave.

    occlum run <program_name> <program_args>
        Run the user program inside an SGX enclave.
        To run the enclave in SGX hardware release mode, use:
        OCCLUM_RELEASE_ENCLAVE=1 occlum run <program_name> <program_args>

    occlum gdb <program_name> <program_args>
        Debug the program running inside an SGX enclave with GDB.
EOF
}

get_conf_root_fs_mac() {
    LD_LIBRARY_PATH="$SGX_SDK/sdk_libs" \
    "$occlum_dir/$build_dir/bin/occlum-protect-integrity" show-mac "$context_dir/build/mount/__ROOT/metadata"
}

get_conf_default_stack_size() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.load(sys.stdin)['process']['default_stack_size']"
}

get_conf_default_heap_size() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.load(sys.stdin)['process']['default_heap_size']"
}

get_conf_default_mmap_size() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.load(sys.stdin)['process']['default_mmap_size']"
}

get_conf_user_space_size() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.load(sys.stdin)['vm']['user_space_size']"
}

get_conf_env() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.dumps(json.load(sys.stdin)['env'])"
}

get_conf_entry_points() {
    cat "$working_dir/Occlum.json" | \
        python -c "import sys, json; print json.dumps(json.load(sys.stdin)['entry_points'])"
}

get_occlum_conf_file_mac() {
    LD_LIBRARY_PATH="$SGX_SDK/sdk_libs" \
    "$occlum_dir/$build_dir/bin/occlum-protect-integrity" show-mac "$context_dir/build/Occlum.json.protected"
}

parse_occlum_user_space_size() {
    local size_with_unit=`get_conf_user_space_size`
    numfmt --from=iec ${size_with_unit::-1}
}

check_has_init() {
    if [ ! -d "$context_dir"  ]; then
        echo "Error: the current working directory is not initialized as an Occlum context. Need to run \"occlum init\" first."
        exit 1
    fi
}

check_has_built() {
    check_has_init

    if [ ! -d "$context_dir/run/mount/root"  ]; then
        echo "Error: the Occlum image and enclave are not built yet. Need to run \"occlum build\" first."
        exit 1
    fi
}


cmd_init() {
    if [ -d "$context_dir"  ]; then
        echo "Error: the current working directory has been initialized as an Occlum context"
        exit 1
    fi
    mkdir "$context_dir"

    cd "$context_dir"
    echo "initialized" > status

    cd "$working_dir"
    mkdir -p image
    mkdir -p image/bin
    mkdir -p image/lib
    mkdir -p image/root
    mkdir -p image/host
    mkdir -p image/tmp

    local occlum_gcc_lib=/usr/local/occlum/x86_64-linux-musl/lib
    cp -t image/lib/ \
        /lib/ld-musl-x86_64.so.1 \
        "$occlum_gcc_lib/libc.so" \
        "$occlum_gcc_lib/libstdc++.so.6" \
        "$occlum_gcc_lib/libgcc_s.so.1" \
        "$occlum_gcc_lib/libgomp.so.1"

    cp "$occlum_dir"/etc/template/Enclave.xml "$working_dir"/
    cp "$occlum_dir"/etc/template/Occlum.json "$working_dir"/
    chmod 644 "$working_dir"/Enclave.xml
    chmod 644 "$working_dir"/Occlum.json

    echo "Initialized an Occlum context in $working_dir"
}

cmd_build() {
    check_has_init

    build_dir=build

    while [ -n "$1" ]; do
        case "$1" in
        --sign-key)     [ -n "$2" ] && ENCLAVE_SIGN_KEY=$2 ; shift 2 || exit_error "empty signing key path"     ;;
        --sign-tool)    [ -n "$2" ] && ENCLAVE_SIGN_TOOL=$2 ; shift 2 || exit_error "empty signing tool path"   ;;
        --sgx-mode)     [[ -n "$2" && "$2" != "HW" ]] && export SGX_MODE=SW && build_dir=build_sim ; shift 2 || exit_error "empty sgx mode";;
        *) exit_error "Unknown option: $1"                                                                      ;;
        esac
    done
    [ -e "$ENCLAVE_SIGN_KEY" ] || exit_error "invalid signing key path: $ENCLAVE_SIGN_KEY"
    [ -e "$ENCLAVE_SIGN_TOOL" ] || exit_error "invalid signing tool path: $ENCLAVE_SIGN_TOOL"
    echo "Enclave sign-tool: $ENCLAVE_SIGN_TOOL"
    echo "Enclave sign-key: $ENCLAVE_SIGN_KEY"

    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SGX_SDK/sdk_libs
        build_dir=build_sim
        echo "SGX mode: $SGX_MODE"
    else
        echo "SGX mode: HW"
    fi

    cd "$context_dir"
    echo "building" > status

    rm -rf build
    rm -rf run

    mkdir -p build/bin
    cp "$occlum_dir/$build_dir/bin/occlum-run" build/bin/
    mkdir -p build/lib
    cp "$occlum_dir/$build_dir/lib/libocclum-libos-core.a" build/lib/
    cp "$occlum_dir/$build_dir/lib/libocclum-pal.so" build/lib/
    mkdir -p build/src/libos/src/builtin

    chmod 531 -R $working_dir/image/bin
    chmod 531 -R $working_dir/image/lib
    mkdir -p build/mount/
    cd "$occlum_dir/$build_dir/bin/" && \
    LD_LIBRARY_PATH="$SGX_SDK/sdk_libs" ./sefs-fuse \
        --integrity-only \
        "$context_dir/build/mount/__ROOT" \
        "$working_dir/image" \
        zip

    export OCCLUM_CONF_ROOT_FS_MAC=`get_conf_root_fs_mac`
    export OCCLUM_CONF_USER_SPACE_SIZE=`get_conf_user_space_size`
    export OCCLUM_CONF_DEFAULT_STACK_SIZE=`get_conf_default_stack_size`
    export OCCLUM_CONF_DEFAULT_HEAP_SIZE=`get_conf_default_heap_size`
    export OCCLUM_CONF_DEFAULT_MMAP_SIZE=`get_conf_default_mmap_size`
    export OCCLUM_CONF_ENV=`get_conf_env`
    export OCCLUM_CONF_ENTRY_POINTS=`get_conf_entry_points`
    cd "$context_dir/build"
    "$occlum_dir/$build_dir/bin/occlum-gen-default-occlum-json"\
        > "Occlum.json"
    LD_LIBRARY_PATH="$SGX_SDK/sdk_libs" "$occlum_dir/$build_dir/bin/occlum-protect-integrity" protect Occlum.json

    export OCCLUM_BUILTIN_CONF_FILE_MAC=`get_occlum_conf_file_mac`
    echo "EXPORT => OCCLUM_BUILTIN_CONF_FILE_MAC = $OCCLUM_BUILTIN_CONF_FILE_MAC"
    export OCCLUM_BUILTIN_VM_USER_SPACE_SIZE=`parse_occlum_user_space_size`
    echo "EXPORT => OCCLUM_BUILTIN_VM_USER_SPACE_SIZE = $OCCLUM_BUILTIN_VM_USER_SPACE_SIZE"

    cd "$context_dir"
    mkdir -p src/libos/src/
    cp "$occlum_dir/src/sgxenv.mk" src/
    cp "$occlum_dir/src/libos/Makefile" src/libos/
    cp "$occlum_dir/src/libos/Enclave.lds" src/libos/
    cp -r "$occlum_dir/src/libos/src/builtin" src/libos/src/builtin
    cd src/libos && \
        make clean-builtin && \
        make "$context_dir/build/lib/libocclum-libos.so" ONLY_REBUILD_BUILTIN=1 CONTEXT=1
    $ENCLAVE_SIGN_TOOL sign \
        -key $ENCLAVE_SIGN_KEY \
        -config "$working_dir/Enclave.xml" \
        -enclave "$context_dir/build/lib/libocclum-libos.so" \
        -out "$context_dir/build/lib/libocclum-libos.signed.so"
    cd "$context_dir"
    echo "built" > status

    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        echo "SIM" > .sgx_mode
    else
        echo "HW" > .sgx_mode
    fi

    mkdir -p "$context_dir/run/mount/root"

    ln -s $occlum_dir/$build_dir/bin/occlum_exec_client $context_dir/build/bin/occlum_exec_client
    ln -s $occlum_dir/$build_dir/bin/occlum_exec_server $context_dir/build/bin/occlum_exec_server

    echo "Built the Occlum image and enclave successfully"
}

cmd_run() {
    check_has_built

    SGX_MODE=$(cat $context_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$context_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$context_dir/build/lib"
    fi

    cd "$working_dir"
    echo "running" > "$context_dir/status"

    RUST_BACKTRACE=1 "$context_dir/build/bin/occlum-run" "$@"

    echo "built" > "$context_dir/status"
}

cmd_start() {
    check_has_built

    SGX_MODE=$(cat $context_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$context_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$context_dir/build/lib"
    fi

    cd "$working_dir"
    echo "running" > "$context_dir/status"

    RUST_BACKTRACE=1 "$context_dir/build/bin/occlum_exec_client" start

    echo "built" > "$context_dir/status"
}

cmd_exec() {
    check_has_built

    SGX_MODE=$(cat $context_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$context_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$context_dir/build/lib"
    fi

    cd "$working_dir"
    echo "running" > "$context_dir/status"

    RUST_BACKTRACE=1 "$context_dir/build/bin/occlum_exec_client" exec -- "$@"

    echo "built" > "$context_dir/status"
}

cmd_stop() {
    check_has_built

    SGX_MODE=$(cat $context_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$context_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$context_dir/build/lib"
    fi

    cd "$working_dir"
    echo "running" > "$context_dir/status"

    RUST_BACKTRACE=1 "$context_dir/build/bin/occlum_exec_client" stop -t 0

    echo "built" > "$context_dir/status"
}

cmd_gdb() {
    check_has_built

    SGX_MODE=$(cat $context_dir/.sgx_mode)
    if [[ -n $SGX_MODE && "$SGX_MODE" != "HW" ]]; then
        export LD_LIBRARY_PATH="$context_dir/build/lib:$SGX_SDK/sdk_libs/"
    else
        export LD_LIBRARY_PATH="$context_dir/build/lib"
    fi

    cd "$working_dir"
    echo "debugging" > "$context_dir/status"

    OCCLUM_GDB=1 $SGX_GDB --args "$context_dir/build/bin/occlum-run" "$@"

    echo "built" > "$context_dir/status"
}

cmd_status() {
    cat "$context_dir/status"
}

set -e

if [[ ( "$#" < 1 ) ]] ; then
    report_arg_error "Error: no sub-command is given"
    exit 1
fi

cmd=$1
case "$cmd" in
    init)
        cmd_init
        ;;
    build)
        cmd_build "${@:2}"
        ;;
    run)
        cmd_run "${@:2}"
        ;;
    start)
        cmd_start
        ;;
    exec)
        cmd_exec "${@:2}"
        ;;
    stop)
        cmd_stop
        ;;
    gdb)
        cmd_gdb "${@:2}"
        ;;
    status)
        cmd_status
        ;;
    *)
        report_arg_error "Error: unknown sub-command $cmd"
        exit 1
esac