#!/bin/bash

#-------------------------------------------------------------------
# Wrapping resources

CPP_WRAPPER=webaudio-asm.cpp
JS_WRAPPER=webaudio-asm-emcc.js
COMB="false"
COMB_SRC=
COMB_EXPORTED=
COMB_WRAPPED=
COMB_WRAPPED_FILES=
COMB_SEP=

EXPORTED_MONO="['_"$name"_constructor','_"$name"_destructor','_"$name"_getSampleRate','_"$name"_init','_"$name"_instanceInit','_"$name"_instanceConstants','_"$name"_instanceResetUserInterface','_"$name"_instanceClear','_"$name"_compute','_"$name"_getNumInputs','_"$name"_getNumOutputs','_"$name"_setParamValue','_"$name"_getParamValue','_"$name"_getJSON']"

EXPORTED_POLY="['_"$name"_poly_constructor','_"$name"_poly_destructor','_"$name"_poly_getSampleRate','_"$name"_poly_init','_"$name"_poly_instanceInit','_"$name"_poly_instanceConstants','_"$name"_poly_instanceResetUserInterface','_"$name"_poly_instanceClear','_"$name"_poly_compute','_"$name"_poly_getNumInputs','_"$name"_poly_getNumOutputs','_"$name"_poly_setParamValue','_"$name"_poly_getParamValue','_"$name"_poly_getJSON','_"$name"_poly_keyOn','_"$name"_poly_keyOff','_"$name"_poly_allNotesOff','_"$name"_poly_ctrlChange','_"$name"_poly_pitchWheel']"

#-------------------------------------------------------------------
# Set Faust include path

if [ -f $FAUST_LIB_PATH/music.lib ]
then
  FAUSTLIB=$FAUST_LIB_PATH
elif [ -f /usr/local/share/faust/music.lib ]
then
  FAUSTLIB=/usr/local/share/faust/
elif [ -f /usr/share/faust/music.lib ]
then
  FAUSTLIB=/usr/share/faust/
else
  echo "$0: Cannot find Faust library dir (usually /usr/local/share/faust)"
fi


#-------------------------------------------------------------------
# Analyze command arguments :
# faust options                 -> OPTIONS
# existing *.dsp files          -> FILES
#

for p in $@; do
    if [ $p = "-help" ] || [ $p = "-h" ]; then
        echo "faust2asmjs [-poly] [-comb] <file.dsp>"
        echo "Use '-poly' to produce a polyphonic DSP, ready to be used with MIDI events"
        echo "Use '-comb' to combine several DSP in a unique resulting 'comb.js' file, sharing the same Emcripten runtime"
    elif [ $p = "-comb" ]; then
        COMB="true"
    elif [ $p = "-poly" ]; then
        CPP_WRAPPER=webaudio-asm-poly.cpp
        JS_WRAPPER=webaudio-asm-poly-emcc.js
    elif [ ${p:0:1} = "-" ]; then
	    OPTIONS="$OPTIONS $p"
	elif [[ -e "$p" ]]; then
	    FILES="$FILES $p"
	else
	    OPTIONS="$OPTIONS $p"        
	fi
done

#-------------------------------------------------------------------
# compile the *.dsp files
#
BINARIES=""

if [ $COMB = "false" ]; then

for f in $FILES; do
    name=$(basename "$f" .dsp)
    
    # compile the C++ code
    faust -a $FAUSTLIB/webaudio/$CPP_WRAPPER -i -uim -cn $name $OPTIONS $f -o $name.cpp || exit
    
    if [ $CPP_WRAPPER = webaudio-asm.cpp ]; then
        EXPORTED=$EXPORTED_MONO
    else
        EXPORTED=$EXPORTED_POLY
	fi
    
    # compile the C++ code to asm.js
    emcc -O2 --memory-init-file 0 $name.cpp -s TOTAL_MEMORY=100663296 --post-js $FAUSTLIB/webaudio/$JS_WRAPPER -o $name-temp.js -s EXPORTED_FUNCTIONS=$EXPORTED || exit
   
    # compose the asm.js code
    sed -e "s/DSP/"$name"/g" $name-temp.js > $name.js
    
    rm $name-temp.js
    rm $name.cpp

	# collect binary file name for FaustWorks
	BINARIES="$BINARIES$name.js;"

done

else

for f in $FILES; do
    name=${f%.dsp}
    
    # compile the C++ code
    faust -a $FAUSTLIB/webaudio/$CPP_WRAPPER -i -uim -cn $name $OPTIONS $f -o $name.cpp || exit
    
    if [ $CPP_WRAPPER = webaudio-asm.cpp ]; then
        EXPORTED=$EXPORTED_MONO
    else
        EXPORTED=$EXPORTED_POLY
	fi
    
    # compose the asm.js code
    sed -e "s/DSP/"$name"/g" $FAUSTLIB/webaudio/$JS_WRAPPER > $name-wrapper.js
    
    COMB_SRC+=$name.cpp
    COMB_SRC+=" "
    
    COMB_EXPORTED+=$COMB_SEP$EXPORTED
    COMB_SEP=","
    
    COMB_WRAPPED_FILES+=$name-wrapper.js
    COMB_WRAPPED_FILES+=" "
    
    COMB_WRAPPED+=" --post-js "
    COMB_WRAPPED+=$name-wrapper.js
  	
done

# compile final file
emcc -O2 --memory-init-file 0 $COMB_SRC -s TOTAL_STACK=20971520 -s TOTAL_MEMORY=41943040 $COMB_WRAPPED -o comb.js \
    -s EXPORTED_FUNCTIONS="["$COMB_EXPORTED"]" || exit

# collect binary file name for FaustWorks
BINARIES="comb.js;"

rm $COMB_SRC
rm $COMB_WRAPPED_FILES

fi

echo $BINARIES
