#!/usr/bin/env bash
set -euo pipefail

if [[ $# -lt 1 || $# -gt 2 ]]; then
    echo "usage: $0 /path/to/SignalSim [build-directory]" >&2
    exit 2
fi

signalsim_source=$(realpath "$1")
project_root=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
build_directory=${2:-"${project_root}/build/signalsim"}

if [[ ! -f "${signalsim_source}/IFdataGen/CMakeLists.txt" ]]; then
    echo "error: ${signalsim_source} is not a SignalSim tree with IFdataGen/CMakeLists.txt" >&2
    exit 3
fi

for dependency in cmake c++; do
    if ! command -v "${dependency}" >/dev/null 2>&1; then
        echo "error: required build dependency '${dependency}' is missing" >&2
        exit 4
    fi
done

generator=()
if command -v ninja >/dev/null 2>&1; then
    generator=(-G Ninja)
fi

echo "SignalSim source: ${signalsim_source}"
echo "Build directory: ${build_directory}"
echo "CMake: $(cmake --version | head -n 1)"
echo "Compiler: $(c++ --version | head -n 1)"
if command -v ninja >/dev/null 2>&1; then
    echo "Ninja: $(ninja --version)"
else
    echo "Ninja: unavailable; using CMake default generator"
fi

cmake -S "${signalsim_source}/IFdataGen" -B "${build_directory}" "${generator[@]}" \
    -DCMAKE_BUILD_TYPE=Release -DUSE_NATIVE_OPT=OFF
cmake --build "${build_directory}" --parallel

executable="${build_directory}/IFdataGen"
if [[ ! -x "${executable}" ]]; then
    echo "error: build completed without expected executable ${executable}" >&2
    exit 5
fi

echo "SIGNALSIM_EXECUTABLE=${executable}"