#!/bin/sh
set -eu

cd "$(dirname "$0")"

platform=native
mode=release
objdir=obj
modules=
developer=0

usage()
{
	echo "usage: build.sh [-d] [-D] [-p platform] [-m module,...] [-o objdir] [target ...]"
	echo "modules:   font toml tile pack ui debug assets image audio mic sound model 2d fx particles picture rm script battle party save stage textbox platformer rpg 3d sector world"
	echo "platforms: native linux bsd windows"
	echo "targets:   all run clean tools pack examples"
	exit 1
}

while getopts dDm:o:p: opt; do
	case $opt in
	d) mode=debug ;;
	D) developer=1 ;;
	m) modules="$modules $(echo "$OPTARG" | tr ',' ' ')" ;;
	o) objdir=$OPTARG ;;
	p) platform=$OPTARG ;;
	*) usage ;;
	esac
done
shift $((OPTIND - 1))

if [ "$platform" = native ]; then
	case $(uname -s) in
	Linux) platform=linux ;;
	MINGW*|MSYS*|CYGWIN*) platform=windows ;;
	*) platform=bsd ;;
	esac
fi

EXE=
DEFS=
case $platform in
linux|bsd)
	LDLIBS="-lX11 -lXext -lXrandr -lm"
	DEFS="-D_POSIX_C_SOURCE=200809L"
	# the BSDs keep X11 out of the default paths
	case $(uname -s) in
	NetBSD) x11=/usr/X11R7 ;;
	OpenBSD) x11=/usr/X11R6 ;;
	FreeBSD|DragonFly) x11=/usr/local ;;
	*) x11= ;;
	esac
	if [ -n "$x11" ]; then
		DEFS="$DEFS -I$x11/include"
		LDLIBS="-L$x11/lib -Wl,-R$x11/lib $LDLIBS"
	fi
	;;
windows)
	CC=${CC:-x86_64-w64-mingw32-gcc}
	LDLIBS="-lgdi32 -lm"
	EXE=.exe
	;;
*)
	echo "build.sh: unknown platform '$platform'" >&2
	usage
	;;
esac

if [ $mode = debug ]; then
	MODEFLAGS="-g -O1 -DKON_DEBUG"
	developer=1
else
	MODEFLAGS="-O2 -DNDEBUG"
fi
[ $developer = 1 ] && MODEFLAGS="$MODEFLAGS -DKON_DEVELOPER"

MODOBJS=

addobj()
{
	case " $MODOBJS " in
	*" $objdir/$1.o "*) ;;
	*) MODOBJS="$MODOBJS $objdir/$1.o" ;;
	esac
}

case " $modules " in
*" sound "*)
	case " $modules " in
	*" audio "*) ;;
	*) modules="$modules audio" ;;
	esac
	;;
esac

for m in $modules; do
	DEFS="$DEFS -DKON_MODULE_$(echo "$m" | tr 'a-z' 'A-Z')"
	case $m in
	font|toml|tile|pack|ui|debug|2d|fx|particles|picture|sound|rm|script|battle|party|save|stage|textbox|platformer|rpg|3d|sector|world) addobj "kon$m" ;;
	assets) addobj konassets ;;
	model) addobj konmodel; addobj konassets ;;
	image) addobj stb_image ;;
	audio|mic)
		addobj miniaudio
		addobj "kon$m"
		# ogg only works when ext/stb_vorbis.c is there
		if [ "$m" = audio ] && [ -f ext/stb_vorbis.c ]; then
			DEFS="$DEFS -DKON_VORBIS"
			addobj stb_vorbis
		fi
		case $platform in
		linux) LDLIBS="$LDLIBS -lpthread -ldl" ;;
		bsd) LDLIBS="$LDLIBS -lpthread" ;;
		esac
		;;
	*) echo "build.sh: unknown module '$m'" >&2; usage ;;
	esac
done

need()
{
	case " $DEFS " in
	*" -DKON_MODULE_$(echo "$1" | tr 'a-z' 'A-Z') "*) ;;
	*) DEFS="$DEFS -DKON_MODULE_$(echo "$1" | tr 'a-z' 'A-Z')" ;;
	esac
	addobj "kon$1"
}

# modules that use other modules
case " $modules " in *" debug "*) need font; need assets ;; esac
case " $modules " in *" ui "*) need font ;; esac
case " $modules " in *" world "*) need 3d; need sector; need tile ;; esac
case " $modules " in *" platformer "*|*" rpg "*) need tile ;; esac
case " $modules " in *" stage "*|*" fx "*|*" picture "*) need 2d ;; esac
case " $modules " in *" textbox "*) need 2d; need font ;; esac
case " $modules " in *" 3d "*) need tile ;; esac
case " $modules " in *" model "*) need assets ;; esac
case " $modules " in *" party "*) need battle; need save ;; esac
case " $DEFS " in *" -DKON_MODULE_ASSETS "*) need pack ;; esac

# the 3D renderer is only compiled when a module that draws in 3D is picked
case " $DEFS " in
*" -DKON_MODULE_3D "*|*" -DKON_MODULE_MODEL "*|*" -DKON_MODULE_SECTOR "*) DEFS="$DEFS -DKONSOFREN_3D" ;;
esac

case " $modules " in
*" debug "*) [ $developer = 1 ] || echo "note: debug module does nothing without -d or -D" ;;
esac

OBJDIR=$objdir
export CC EXE LDLIBS MODEFLAGS DEFS OBJDIR MODOBJS

mkdir -p "$OBJDIR"
flags="$MODEFLAGS $DEFS $LDLIBS $MODOBJS ${CC:-cc}"
if [ "$(cat "$OBJDIR/.flags" 2>/dev/null)" != "$flags" ]; then
	rm -f "$OBJDIR"/*.o
	echo "$flags" > "$OBJDIR/.flags"
fi

echo "===> platform $platform, $mode build, modules:${modules:- none}"
exec ${MAKE:-make} ${*:-all}