#!/bin/bash
set -eu

if [ -z "$1" ]; then
	echo "No output parameter named, please pass the build directory to this script."
	exit 1
fi

wasm=""
if [[ $# -eq 2 ]]; then
	if [[ "$2" -eq "wasm" ]]; then
		wasm="1"
	fi
fi

script_dir=$(cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd)
build="$1"
	
if [ -n "$wasm" ]; then
	ext_path="${script_dir}/external"

	cpp_compiler="clang++"
	c_compiler="clang"
	flags="-target wasm32 -nostdlib -Wl,--no-entry -c -static -mbulk-memory -mbulk-memory-opt -matomics -msimd128 -mno-gc"
	files="${ext_path}/tinyalloc/tinyalloc.c"
	includes="-I${ext_path}/tinyalloc"
	out=""

	$c_compiler $flags $includes $files $out
else
	if   [ -x "$(command -v g++)"     ]; then cpp_compiler="g++";     c_compiler="gcc";
	elif [ -x "$(command -v clang++)" ]; then cpp_compiler="clang++"; c_compiler="clang";
	else                                 echo "Unable to find c++ cpp_compiler"; exit -1; fi;

	if   [ -x "$(command -v mold)" ]; then linker_cmd="-fuse-ld=mold"; 
	elif [ -x "$(command -v lld)"  ]; then linker_cmd="-fuse-ld=lld";
	elif [ -x "$(command -v ld)"   ]; then linker_cmd="-fuse-ld=ld"; 
	else                              echo "Unable to find c/c++ linker"; exit -1; fi;

	shared_flags="-c -static -msse4.2 -Wno-everything $linker_cmd"

	mkdir -p $build

	# COMPILER FLAGS
	out="-o"

	# STB_IMAGE
	src="${script_dir}/external/stb/stb.c"
	flags="-std=c99 -Iexternal/stb $shared_flags"
	obj="${build}/stb.o"
	lib="${build}/libstb.a"

	if ! [ -f "${build}/libstb.a" ]; then
		$c_compiler $flags $src $out $obj
		ar rcs $lib $obj
		rm $obj
	fi

	# M3D
	#src="${script_dir}/external/m3d/m3d.c"
	#flags="-std=c99 -Wno-everything -Iexternal/m3d -c -static"
	#obj="${build}/m3d.o"
	#lib="${build}/libm3d.a"
	#
	#if ! [ -f "${build}/libm3d.a" ]; then
	#	$c_compiler $flags $src $out $obj
	#	ar rcs $lib $obj
	#	rm $obj
	#fi

	# CGLTF
	src="${script_dir}/external/cgltf/cgltf.c"
	flags="-std=c99 -Iexternal/cgltf $shared_flags"
	obj="${build}/cgltf.o"
	lib="${build}/libcgltf.a"

	if ! [ -f "${build}/libcgltf.a" ]; then
		$c_compiler $flags $src $out $obj
		ar rcs $lib $obj
		rm $obj
	fi


	# XXHASH
	#src="${script_dir}/external/xxhash/xxhash.c"
	#flags="-std=c99 -Iexternal/xxhash $shared_flags"
	#obj="${build}/xxhash.o"
	#lib="${build}/libxxhash.a"

	#if ! [ -f $lib ]; then
	#	$c_compiler $flags $src $out $obj
	#	ar rcs $lib $obj
	#	rm $obj
	#fi
fi