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

# Determine absolute project root (script’s parent directory)
PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Helper to configure & build
# $1 = build directory name under PROJECT_ROOT/build
# $2 = CMake build type (arbitrary string; flags are driven by -DCMAKE_CXX_FLAGS)
# $3 = CXX flags
cmake_build() {
  local name=$1
  local type=$2
  local flags=$3
  local build_dir="${PROJECT_ROOT}/build/${name}"

  echo "=== Configuring ${name} (${flags}) ==="
  rm -rf "${build_dir}"
  mkdir -p "${build_dir}"
  pushd "${build_dir}" >/dev/null

    cmake \
      -DCMAKE_BUILD_TYPE="${type}" \
      -DCMAKE_CXX_FLAGS="${flags}" \
      "${PROJECT_ROOT}"
    make -j$(nproc)

  popd >/dev/null
}

# 1) Debug: -g
cmake_build "Debug" "Debug" "-g"

# 2) Release: -O3
cmake_build "Release" "Release" "-O3"

# 3) RelWithDebugInfo: -g -O3
cmake_build "RelWithDebugInfo" "RelWithDebInfo" "-g -O3"

# 4) Generate verbose assembly (.S) for all translation units in RelWithDebugInfo
echo "=== Generating .S assembly in build/RelWithDebugInfo ==="
ASM_OUT_DIR="${PROJECT_ROOT}/build/RelWithDebugInfo/asm"
mkdir -p "${ASM_OUT_DIR}"

# adjust the source‐file patterns as needed (e.g. .cc, .cxx)
find "${PROJECT_ROOT}" -type f \( -name '*.cpp' -o -name '*.cc' \) | while read -r src; do
  fname="$(basename "${src}")"
  base="${fname%.*}"
  g++ -g -O3 -masm=intel -fno-verbose-asm -std=c++20 -S "${src}" \
      -o "${ASM_OUT_DIR}/${base}.S"
done

echo "All builds complete."