#!/bin/bash
set -euo pipefail

usage() {
  echo "Usage: $0 [-b|--build] [-m|--make] <new-project-name>"
  echo
  echo "Options:"
  echo "  -m, --make     After cmake, run 'make' inside the build directory (requires make)"
  echo "  -h, --help     Show this help"
  echo
  echo "Example: $0 -b my_project" 
  exit 1
}

DO_MAKE=0

while [[ ${1:-} == -* ]]; do
  case "$1" in
    -m|--make) DO_MAKE=1; shift ;;
    -h|--help) usage ;;
    --) shift; break ;;
    *) echo "Unknown option: $1" >&2; usage ;;
  esac
done

if [ $# -ne 1 ]; then
  usage
fi

raw_name="$1"
name="${raw_name#@}"
src="as_template"
dest="${name}"

if [ -e "$dest" ]; then
  echo "Error: destination '$dest' already exists" >&2
  exit 1
fi

echo "$0: COPY: $src -> $dest..."
cp -a -- "$src" "$dest"

echo "$0: MOVE: $src/as_template.cpp -> $dest/${name}.cpp..."
mv "$dest/as_template.cpp" "$dest/${name}.cpp"

echo "$0: REPLACE: 'as_template' -> '$name' in all files in $dest..."
sed -i "s/as_template/${name}/g" "$dest"/*

echo "Preparing build directory and running cmake..."

cd "$dest" && mkdir -p build && cd build && cmake ..
echo "CMake finished (see $dest/build)."

if [ "$DO_MAKE" -eq 1 ]; then
  echo "Make option enabled. Building with make..."

  if command -v nproc >/dev/null 2>&1; then
    NPROCS=$(nproc)
  elif getconf _NPROCESSORS_ONLN >/dev/null 2>&1; then
    NPROCS=$(getconf _NPROCESSORS_ONLN)
  else
    NPROCS=1
  fi

  make -j"$NPROCS"
  echo "Make finished."
fi

echo "Created new assignment '$dest'."

exit 0