#! /bin/bash -e

#############################################################################################################
#                                                                                                           #
#   Compiles Faust programs to Linux x86_64 library suitable for the Unity environment                      #
#                                                                                                           #
#   (c) Grame, 2017                                                                                         #
#                                                                                                           #
#############################################################################################################

#   This script shouldn't be used on its own, use the "faust2unity" script instead
#   The libraries are firstly wrapped by the unityplugin.cpp architecture file
#   They have to be used in the Unity environment
#   The libraries does not work by themselves, they need the FaustPlugin_<dspname>.cs and FaustUtilities_<dspname>.cs files to be functionnal
#   These files are automatically generated by the "faust2unity" script

. faustpath
. faustoptflags

CXXFLAGS=$MYGCCFLAGS

NVOICES=-1

#-------------------------------------------------------------------
# Dispatch command arguments

while [ $1 ] 
do
    p=$1
    
    if [ $p = "-help" ] || [ $p = "-h" ]; then
        echo "faust2linuxunity [additional Faust options (-vec -vs 8...)] <file1.dsp> [<file2.dsp>]"
        echo "Create Linux shared library for faust unity plugin."
        echo "Use 'faust2unity -linux' to also create the c# files"
        echo "Use '-nvoices <num>' to produce a polyphonic self-contained DSP with <num> voices, ready to be used with MIDI"
        echo "See architecture/unity/README.md for more info"
        exit
    fi

	if [ $p = "-nvoices" ]; then
        shift
        NVOICES=$1
    elif [ ${p:0:1} = "-" ]; then
	    OPTIONS="$OPTIONS $p"
	elif [[ -f "$p" ]]; then
	    FILES="$FILES $p"
	else
	    OPTIONS="$OPTIONS $p"        
	fi
	
shift
done

#------------------------------------------------------------------------------
# Compiler g++
#

CXX="g++"
(which "$CXX" >/dev/null) || (echo "compiler $CXX not found. See -help for more info"; exit 1)

#-------------------------------------------------------------------
# Compiler settings

CXXFLAGS+=" -fPIC"
LIB="-shared"
EXT=".so"

#-------------------------------------------------------------------
# compile the *.dsp files

for p in $FILES; do

    CUR=$(pwd)
    f=$(basename "$p")
    NAME=${f%.dsp}
    FNAME=FaustPlugin_$NAME
    LIBNAME=lib$FNAME$EXT
    SRCDIR=$(dirname "$p")
    FIN=$FNAME/Linux

    # creates a temporary dir 
    TDR=$(mktemp -d faust.XXXXXX)
    TMP=$TDR/${f%.dsp}
    mkdir "$TMP"

    # checks if final dir exists, if not creates it
    if [ ! -d "$FIN" ]; then
        mkdir -p "$FIN"
    fi

    # compile faust to c++
    faust -i -a $FAUSTARCH/unity/unityplugin.cpp $OPTIONS "$SRCDIR/$f" -o "$TMP/$NAME.cpp" || (echo "$f : Faust to C++ compilation failed in faust2linuxunity"; exit 1)

    # compile c++ to binary
    (
        cd "$TMP"
        if [ $NVOICES == -1 ]; then
        	$CXX $CXXFLAGS $LIB -Dmydsp=$NAME -o $LIBNAME $NAME.cpp
		else
			$CXX $CXXFLAGS $LIB -Dmydsp=$NAME -DPOLY -o $LIBNAME $NAME.cpp
		fi
	) > /dev/null || (echo "$f : C++ to linux library compilation failed in faust2linuxunity"; exit 1)

    # moves binary to final dir
    rm -rf "$SRCDIR/$LIBNAME"
    mv "$TMP/$LIBNAME" "$FIN/$LIBNAME"
    rm -rf "$TDR"

    echo "$f : linux compilation completed"
done



