#!/usr/bin/env bash

set -eu -o pipefail

SOURCE_DIR=/source
BUILD_DIR=/build
CMD=${1:-usage}
shift

# Build type can be "debug" or "release", fallbacks to "release" by default
BUILD_TYPE=$(echo "$BUILD_TYPE" | tr "[:upper:]" "[:lower:]")
DRAIOS_DEBUG_FLAGS=
case "$BUILD_TYPE" in
"debug")
    DRAIOS_DEBUG_FLAGS="-D_DEBUG -DNDEBUG"
    ;;
*)
    BUILD_TYPE="release"
    ;;
esac

case "$CMD" in
"cmake")
    # Check that source directory contains Falco
    if [ ! -d "$SOURCE_DIR/falco" ]; then
        echo "Missing falco source." >&2
        exit 1
    fi
    # Prepare build directory
    mkdir -p "$BUILD_DIR/$BUILD_TYPE"
    cd "$BUILD_DIR/$BUILD_TYPE"

    cmake \
    -DCMAKE_BUILD_TYPE="$BUILD_TYPE" \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DBUILD_DRIVER="$BUILD_DRIVER" \
    -DBUILD_BPF="$BUILD_BPF" \
    -DBUILD_WARNINGS_AS_ERRORS="$BUILD_WARNINGS_AS_ERRORS" \
    -DFALCO_VERSION="$FALCO_VERSION" \
    -DDRAIOS_DEBUG_FLAGS="$DRAIOS_DEBUG_FLAGS" \
    -DUSE_BUNDLED_DEPS=ON \
    "$SOURCE_DIR/falco"
    exit "$(printf '%d\n' $?)"
    ;;
"bash")
    CMD=/bin/bash
    ;& # fallthrough
"usage")
    exec "$CMD" "$@"
    ;;
*)
    if [ ! -d "$BUILD_DIR/$BUILD_TYPE" ]; then
        echo "Missing $BUILD_DIR/$BUILD_TYPE directory: run cmake."
        exit 1
    fi
    cd "$BUILD_DIR/$BUILD_TYPE"
    make -j"$MAKE_JOBS" "$CMD"
    ;;
esac