#!/bin/sh

# if an error occurs exit
set -e

# set defaults for these if they don't exist
if [ -z $ARCH ]; then
    ARCH='linux'
fi

if [ -z $MODE ]; then
    MODE='debug'
fi

if [ -z $UI ]; then
    UI='tui'
fi

case $ARCH in
  "linux")
      if [ -z $CC ]; then
          CC='gcc'
      fi
    ;;
  "web")
      CC=emcc
   ;;
esac

# setup dirs
SRC_DIR=./arch/$ARCH/$UI
BUILD_DIR=./out/$ARCH/$UI

# clean cmd
case $1 in
    "clean")
    echo "Deleting $BUILD_DIR"
    rm -rf $BUILD_DIR
    exit 0
esac

# run cmd
case $1 in
  "run")

  case $ARCH in
    "linux")
	$BUILD_DIR/undar $2
      ;;
    "web")
	emrun $BUILD_DIR/undar.html
     ;;
  esac
    
  exit 0
esac

# create the build dir if it doesnt exist
if [ -d $BUILD_DIR ]; then
    echo "Building to $BUILD_DIR"
else
    echo "$BUILD_DIR not found, creating"
    mkdir -p $BUILD_DIR
fi

# setup the build flags based on the build mode
case $MODE in
    "debug")
	BUILD_FLAGS="-g -Wall -Wextra -Werror -pedantic"
    ;;
    "release")
	BUILD_FLAGS="-O2 -Wall -Wextra -Werror -pedantic"
    ;;
esac

# set up the flags based on the UI
case $UI in
  "tui")
  case $CC in
      "gcc")
        LINK_FLAGS=""
      ;;
      "emcc")
        LINK_FLAGS="-s ASYNCIFY --shell-file $SRC_DIR/../shell_minimal.html"
      ;;
  esac
  ;;
  "gui")
  case $CC in
      "gcc")
        LINK_FLAGS="$(sdl2-config --libs --cflags)"
      ;;
      "emcc")
        LINK_FLAGS="-s USE_SDL=2 -s ASYNCIFY --shell-file $SRC_DIR/../shell_minimal.html"
      ;;
  esac
  ;;
esac

# build the core VM
VM_BUILD_FLAGS="$BUILD_FLAGS -std=c89 -ffreestanding -nostdlib -fno-builtin"
${CC} -c vm/libc.c -o $BUILD_DIR/libc.o $VM_BUILD_FLAGS
${CC} -c vm/vm.c -o $BUILD_DIR/vm.o $VM_BUILD_FLAGS

# Set up the final build command
case $ARCH in
  "linux")
    BUILD_CMD="$CC -o $BUILD_DIR/undar $SRC_DIR/main.c $LINK_FLAGS $BUILD_DIR/libc.o $BUILD_DIR/vm.o $BUILD_FLAGS $LINK_FLAGS"
    ;;
  "web")
    BUILD_CMD="$CC $SRC_DIR/main.c $BUILD_DIR/libc.o $BUILD_DIR/vm.o -o $BUILD_DIR/undar.html $BUILD_FLAGS $LINK_FLAGS"
   ;;
esac

echo "$BUILD_CMD"
${BUILD_CMD}

echo "Finished building to $BUILD_DIR/undar"