#!/bin/bash
#
# .dists/emscripten/build.sh -- Sets up an emscripten build environment and builds ScummVM for webassembly
#
# ScummVM is the legal property of its developers, whose names
# are too numerous to list here. Please refer to the COPYRIGHT
# file distributed with this source distribution.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#



# exit when any command fails
set -e

ROOT_FOLDER=$(pwd)
DIST_FOLDER="$ROOT_FOLDER/dists/emscripten"
LIBS_FOLDER="$DIST_FOLDER/libs"
TASKS=()
CONFIGURE_ARGS=()
_bundle_games=()
_verbose=false
EMSDK_VERSION="${EMSDK_VERSION:-4.0.10}"
EMSCRIPTEN_VERSION="$EMSDK_VERSION"

usage="\
Usage: ./dists/emscripten/build.sh [TASKS] [OPTIONS]

Output the configuration name of the system \`$me' is run on.

Tasks: 
  (space separated) List of tasks to run. See ./dists/emscripten/README.md for details.    

Options:
  -h, --help         print this help, then exit
  -v, --verbose      print all commands run by the script
  --*                all other options are passed on to the configure script
                     Note:  --enable-a52, --enable-faad, --enable-fluidlite, --enable-fribidi,
                            --enable-mad, --enable-mpcdec, --enable-mpeg2, --enable-mikmod,
                            --enable-retrowave, --enable-theoradec and --enable-vpx
                            also download and build the required library
"

_fluidlite=false
_fribidi=false
_liba52=false
_libfaad=false
_libmad=false
_libmpcdec=false
_libmpeg2=false
_libmikmod=false
_libtheoradec=false
_libvpx=false
_retrowave=false

# parse inputs
for i in "$@"; do
  case $i in
  --enable-a52)
    _liba52=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-faad)
    _libfaad=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-fluidlite)
    _fluidlite=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-fribidi)
    _fribidi=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-mad)
    _libmad=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-mpeg2)
    _libmpeg2=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-mpcdec)       
    _libmpcdec=true  
    # We don't pass --enable-mpcdec as configure
    # has to establish which API to use (old or new)
    ;;
  --enable-openmpt) 
    _libopenmpt=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-retrowave)
    _retrowave=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-theoradec)
    _libtheoradec=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --enable-vpx)
    _libvpx=true
    CONFIGURE_ARGS+=" $i"
    ;;
  --bundle-games=*)
    str="${i#*=}"
    _bundle_games="${str//,/ }"
    shift # past argument=value
    ;;
  -h | --help)
    echo "$usage"
    exit
    ;;
  -v | --verbose)
    _verbose=true
    ;;
  -* | --*)
    CONFIGURE_ARGS+=" $i"
    ;;
  *)
    TASKS+="|$i" # save positional arg
    shift        # past argument
    ;;
  esac
done

TASKS="${TASKS:1}"
if [[ -z "$TASKS" ]]; then
  echo "$usage"
  exit
fi

# print commands
if [[ "$_verbose" = true ]]; then
  set -o xtrace
fi

#################################
# Setup Toolchain
#################################

# Download Emscripten
if [[ ! -d "$DIST_FOLDER/emsdk-$EMSDK_VERSION" ]]; then
  echo "$DIST_FOLDER/emsdk-$EMSDK_VERSION not found. Installing Emscripten"
  cd "$DIST_FOLDER"
  if [[ "$EMSDK_VERSION" = "tot" ]]; then
    git clone "https://github.com/emscripten-core/emsdk/" emsdk-tot
  else
    wget -nc --content-disposition --no-check-certificate "https://github.com/emscripten-core/emsdk/archive/refs/tags/${EMSDK_VERSION}.tar.gz"
    tar -xf "emsdk-${EMSDK_VERSION}.tar.gz"
  fi
fi

cd "$DIST_FOLDER/emsdk-${EMSDK_VERSION}"
ret=0 # https://stackoverflow.com/questions/18621990/bash-get-exit-status-of-command-when-set-e-is-active
./emsdk activate ${EMSCRIPTEN_VERSION} || ret=$?
if [[ $ret != 0 ]]; then
  echo "install missing emscripten version"
  cd "$DIST_FOLDER/emsdk-${EMSDK_VERSION}"
  ./emsdk install ${EMSCRIPTEN_VERSION}

  cd "$DIST_FOLDER/emsdk-${EMSDK_VERSION}"
  ./emsdk activate ${EMSCRIPTEN_VERSION}
fi

source "$DIST_FOLDER/emsdk-$EMSDK_VERSION/emsdk_env.sh"

# export node_path - so we can use all node_modules bundled with emscripten (e.g. requests)
EMSDK_NPM=$(dirname $EMSDK_NODE)/npm
EMSDK_PYTHON="${EMSDK_PYTHON:-python3}"
EMSDK_NPX=$(dirname $EMSDK_NODE)/npx
export NODE_PATH="$(dirname $EMSDK_NODE)/../lib/node_modules/"
LIBS_FLAGS=""

cd "$ROOT_FOLDER"

#################################
# Download + Install Libraries (if not provided by Emscripten-Ports, those are handled by configure)
#################################
if [[ ! -d "$LIBS_FOLDER/build" ]]; then
  mkdir -p "$LIBS_FOLDER/build"
fi

if [ "$_liba52" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/liba52.a" ]]; then
    echo "building a52dec-0.7.4"
    cd "$LIBS_FOLDER"
    wget -nc "https://code.videolan.org/videolan/liba52/-/archive/0.7.4/liba52-0.7.4.tar.gz"
    tar -xf liba52-0.7.4.tar.gz
    cd "$LIBS_FOLDER/liba52-0.7.4/"
    autoreconf -i
    CFLAGS="-fPIC -Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/"
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-a52-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libfaad" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libfaad.a" ]]; then
    echo "building faad2-2.8.8"
    cd "$LIBS_FOLDER"
    wget -nc "https://sourceforge.net/projects/faac/files/faad2-src/faad2-2.8.0/faad2-2.8.8.tar.gz"
    tar -xf faad2-2.8.8.tar.gz
    cd "$LIBS_FOLDER/faad2-2.8.8/"
    CFLAGS="-fPIC -Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/"
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-faad-prefix=$LIBS_FOLDER/build"
fi

if [ "$_fluidlite" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libfluidlite.a" ]]; then
    echo "building fluidlite-b0f187b"
    cd "$LIBS_FOLDER"
    wget -nc --content-disposition "https://github.com/divideconcept/FluidLite/archive/b0f187b404e393ee0a495b277154d55d7d03cbeb.tar.gz"
    tar -xf FluidLite-b0f187b404e393ee0a495b277154d55d7d03cbeb.tar.gz
    cd "$LIBS_FOLDER/FluidLite-b0f187b404e393ee0a495b277154d55d7d03cbeb/"
    emcmake cmake -B "build/"   -DFLUIDLITE_BUILD_STATIC:BOOL="1"  -DCMAKE_INSTALL_PREFIX="$LIBS_FOLDER/build/" -DCMAKE_INSTALL_LIBDIR="lib"
    cmake --build "build/"  
    cmake --install "build/"  
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-fluidlite-prefix=$LIBS_FOLDER/build"
fi

if [ "$_fribidi" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libfribidi.a" ]]; then
    echo "building fribidi-1.0.10"
    cd "$LIBS_FOLDER"
    wget -nc "https://github.com/fribidi/fribidi/releases/download/v1.0.10/fribidi-1.0.10.tar.xz"
    tar -xf fribidi-1.0.10.tar.xz
    cd "$LIBS_FOLDER/fribidi-1.0.10/"
    CFLAGS="-fPIC -Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/"
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-fribidi-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libmad" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libmad.a" ]]; then
    echo "building libmad-0.15.1b"
    cd "$LIBS_FOLDER"
    wget -nc "https://downloads.sourceforge.net/mad/libmad-0.15.1b.tar.gz"
    tar -xf libmad-0.15.1b.tar.gz
    cd "$LIBS_FOLDER/libmad-0.15.1b/"
    # libmad needs patching as -fforce-mem has been removed in GCC 4.3 and later
    sed -i -e 's/-fforce-mem//g' configure
    CFLAGS="-Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/" --with-pic --enable-fpm=no
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-mad-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libmpeg2" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libmpeg2.a" ]]; then
    echo "building libmpeg2-946bf4b5"
    cd "$LIBS_FOLDER"
    wget -nc --content-disposition  "https://code.videolan.org/videolan/libmpeg2/-/archive/946bf4b518aacc224f845e73708f99e394744499/libmpeg2-946bf4b518aacc224f845e73708f99e394744499.tar.gz"
    tar -xf libmpeg2-946bf4b518aacc224f845e73708f99e394744499.tar.gz
    cd "$LIBS_FOLDER/libmpeg2-946bf4b518aacc224f845e73708f99e394744499/"
    autoreconf -i
    CFLAGS="-fPIC -Oz" emconfigure ./configure --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/" --disable-sdl
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-mpeg2-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libmpcdec" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libmpcdec.a" ]]; then
    echo "building libmpcdec-1.2.6"
    cd "$LIBS_FOLDER"
    wget -nc "https://files.musepack.net/source/libmpcdec-1.2.6.tar.bz2"
    tar -xf libmpcdec-1.2.6.tar.bz2
    cd "$LIBS_FOLDER/libmpcdec-1.2.6/"
    CFLAGS="-Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/" --with-pic --enable-fpm=no
    emmake make -j 5
    emmake make install 
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-mpcdec-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libopenmpt" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libopenmpt.a" ]]; then
    echo "building libopenmpt-0.7.13"
    cd "$LIBS_FOLDER"
    wget -nc "https://lib.openmpt.org/files/libopenmpt/src/libopenmpt-0.6.22+release.makefile.tar.gz"
    tar -xf libopenmpt-0.6.22+release.makefile.tar.gz
    cd "$LIBS_FOLDER/libopenmpt-0.6.22+release/"
    CFLAGS="-fPIC -Oz" emmake make -j 5 CONFIG=emscripten EMSCRIPTEN_TARGET=wasm
    emmake make install CONFIG=emscripten EMSCRIPTEN_TARGET=wasm PREFIX="$LIBS_FOLDER/build/"
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-openmpt-prefix=$LIBS_FOLDER/build"
fi

if [ "$_retrowave" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libRetroWave.a" ]]; then
    echo "build libRetroWave-e6bf60e"
    cd "$LIBS_FOLDER"
    wget -nc --content-disposition "https://github.com/SudoMaker/RetroWave/archive/e6bf60eed2d2bd1deff688d645be71a32bbf05bb.tar.gz"
    tar -xf RetroWave-e6bf60eed2d2bd1deff688d645be71a32bbf05bb.tar.gz
    cd "$LIBS_FOLDER/RetroWave-e6bf60eed2d2bd1deff688d645be71a32bbf05bb/"
    CFLAGS="-fPIC -s USE_ZLIB=1 -Oz"  emcmake cmake -B "build/" -DRETROWAVE_BUILD_PLAYER=0  -DCMAKE_INSTALL_PREFIX="$LIBS_FOLDER/build/" -DCMAKE_INSTALL_LIBDIR="lib"
    cmake --build "build/"  
    cmake --install "build/"  
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-retrowave-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libtheoradec" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libtheora.a" ]]; then
    echo "build libtheora-1.1.1"
    cd "$LIBS_FOLDER"
    wget -nc "https://downloads.xiph.org/releases/theora/libtheora-1.1.1.tar.xz"
    tar -xf libtheora-1.1.1.tar.xz
    cd "$LIBS_FOLDER/libtheora-1.1.1/"
    CFLAGS="-fPIC -s USE_OGG=1 -Oz" emconfigure ./configure --host=wasm32-unknown-none --build=wasm32-unknown-none --prefix="$LIBS_FOLDER/build/" --disable-asm
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-theoradec-prefix=$LIBS_FOLDER/build"
fi

if [ "$_libvpx" = true ]; then
  if [[ ! -f "$LIBS_FOLDER/build/lib/libvpx.a" ]]; then
    echo "build libvpx-1.15.0"
    cd "$LIBS_FOLDER"
    wget -nc --content-disposition "https://github.com/webmproject/libvpx/archive/refs/tags/v1.15.0.tar.gz"
    tar -xf libvpx-1.15.0.tar.gz
    cd "$LIBS_FOLDER/libvpx-1.15.0/"
    CFLAGS="-fPIC -Oz" emconfigure ./configure --disable-vp8-encoder --target=generic-gnu --disable-vp9-encoder --prefix="$LIBS_FOLDER/build/"
    emmake make -j 5
    emmake make install
  fi
  LIBS_FLAGS="${LIBS_FLAGS} --with-vpx-prefix=$LIBS_FOLDER/build"
fi

#################################
# Configure
#################################
if [[ "configure" =~ $(echo ^\(${TASKS}\)$) || "build" =~ $(echo ^\(${TASKS}\)$) ]]; then
  cd "${ROOT_FOLDER}"
  echo "Running configure"
  # TODO: Figure out how configure could guess the host
  emconfigure ./configure --host=wasm32-unknown-emscripten --build=wasm32-unknown-emscripten ${CONFIGURE_ARGS} ${LIBS_FLAGS}

  # TODO: configure currently doesn't clean up all files it creates
  rm scummvm-conf.*
fi

#################################
# Make / Compile
#################################
if [[ "make" =~ $(echo ^\(${TASKS}\)$) || "build" =~ $(echo ^\(${TASKS}\)$) ]]; then
  cd "${ROOT_FOLDER}"
  echo "Running make"
  num_cpus=$(nproc || grep -c ^processor /proc/cpuinfo || echo 1)
  emmake make -j ${num_cpus}
fi

#################################
# Bundle everything into a neat package
#################################
if [[ "dist" =~ $(echo ^\(${TASKS}\)$) || "build" =~ $(echo ^\(${TASKS}\)$) ]]; then
  echo "Bundle ScummVM for static file hosting"
  emmake make dist-emscripten
fi

#################################
# Run Development Server
#################################
if [[ "run" =~ $(echo ^\(${TASKS}\)$) ]]; then
  echo "Run ScummVM"
  cd "${ROOT_FOLDER}/build-emscripten/"
  emrun --browser=chrome scummvm.html
fi

#################################
# Clean
#################################
if [[ "clean" =~ $(echo ^\(${TASKS}\)$) ]]; then
  emmake make clean || true
  emmake make distclean || true
  emcc --clear-ports --clear-cache
  rm -rf ./build-emscripten/ || true
  rm scummvm.debug.wasm || true
  rm scummvm.wasm || true
  rm scummvm.js || true
fi