#! /usr/bin/env bash

# Install prefix
PREFIX="$HOME/.local"
# Individual component selection
BUILD_fxsdk=1
BUILD_fxconv=1
BUILD_fxg1a=1

help() {
  cat << EOF
Configuration options for the fxSDK (fx9860g and fxcg50 development tools).

Tool selection:
  <tool> may be one of the following:
    fxsdk            Project management (you generally want this)
    fxconv           Asset conversion for standard and custom gint formats
    fxg1a            G1A file wrapper, editor and analyzer

  --enable-<tool>    Build and install the selected tool [default]
  --disable-<tool>   Do not build or install the selected tool

Install folders:
  Executables will be installed in <prefix>/bin and runtime data in
  <prefix>/share/fxsdk.

  --prefix=<prefix>  Base install folder [default $HOME/.local]
EOF
  exit 0
}

# Parse arguments
for arg; do case "$arg" in
  -h | -? | --help)
    help;;

  --prefix=*)
    PREFIX=${arg#--prefix=};;

  --enable-*)
    tool="${arg#--enable-}"
    if [[ ! ":fxsdk:fxg1a:fxconv:" =~ ":$tool:" ]]; then
      echo "error: $arg: no such tool"
      exit 1
    fi
    eval "BUILD_${tool}=1";;

  --disable-*)
    tool="${arg#--disable-}"
    if [[ ! ":fxsdk:fxg1a:fxconv:" =~ ":$tool:" ]]; then
      echo "error: $arg: no such tool"
      exit 1
    fi
    eval "BUILD_${tool}=0";;

  *)
    echo "error: unrecognized option $arg"
    exit 1;;
esac; done

# Generate sub-Makefile with configuration details
gen() {
  # Allow an install script to change the destination at the last second
  # to have all files in a separate root before packaging
  # TODO: Support DESTDIR instead
  echo "PREFIX ?= $PREFIX"
  echo -n "TARGETS ="
  [[ $BUILD_fxsdk  = 1 ]] && echo -n " fxsdk"
  [[ $BUILD_fxconv = 1 ]] && echo -n " fxconv"
  [[ $BUILD_fxg1a  = 1 ]] && echo -n " fxg1a"
  echo ""
}

gen > Makefile.cfg