#!/bin/sh
#
# Build script to automatically build Chocolate Doom.  This will work
# on OSX and Linux, and hopefully Cygwin as well (havent tried)
#
# To build on OSX:
#  1. Install Xcode (available on your OSX DVDs or from the Apple
#     website)
#  2. Type:
#       curl http://www.chocolate-doom.org/build-chocolate-doom | sh
#
# To build on Linux:
#  1. Make sure gcc is installed (depends on your distribution).
#  2. Type:
#       wget -O - http://www.chocolate-doom.org/build-chocolate-doom | sh
#

CHOCOLATE_DOOM_DIR=~/chocolate-doom-sdl2
PACKAGES_DIR=$CHOCOLATE_DOOM_DIR/packages
BUILD_DIR=$CHOCOLATE_DOOM_DIR/build

# Check if the specified string matches the glob pattern.

pattern_match() {
    pattern="$1"

    case "$2" in
        $pattern)
            true
            ;;
        *)
            false
            ;;
    esac
}

# Determine if a given program is in the PATH.

have_tool() {
    tool=$1

    result=1
    SAVE_IFS=$IFS
    IFS=:

    for dir in $PATH; do
        if [ -e $dir/$tool ]; then
#            echo $dir/$tool
            result=0
            break
        fi
    done

    IFS=$SAVE_IFS

    return $result
}

# Download a given URL to stdout.

get_url() {
    url=$1

    if have_tool curl; then
        curl $url
        return
    fi

    if have_tool wget; then
        wget $url -O -
        return
    fi

    # Desperate?

    for l in lynx links elinks; do
        if have_tool $l; then
            echo "Using $l to download $url..." >&2
            $l -source $url
            return
        fi
    done

    echo "No tool available to retrieve URLs.  Please install curl or wget." >&2

    exit -1
}

# Extract a tar.gz file.

extract_targz() {
    file=$1

    gunzip < $1 | tar -x
}

# Download a file to the packages directory.

download_file() {
    url=$1
    file=$2

    if get_url $url$file > $PACKAGES_DIR/$file.part; then
        mv $PACKAGES_DIR/$file.part $PACKAGES_DIR/$file
        return 0
    else
        echo "File $file failed to download! Please try again."
        return 1
    fi
}

# fetch_from_git(git_url, checkout_dir_name)
# Check module out from Git.

fetch_from_git() {
    git_url=$1
    checkout_dir_name=$2

    checkout_path="$BUILD_DIR/$checkout_dir_name"

    if [ ! -e "$checkout_path" ]; then

        if ! git clone "$git_url" "$checkout_path"; then
            echo "Failed to check out $checkout_dir_name from Git"
            exit
        fi

	# We want to build the SDL2 branch rather than master.
	pushd "$checkout_path"
	git checkout sdl2-branch
	popd
    else
        pushd "$checkout_path"
        git pull
        popd
    fi
}

# fetch_module(base_url, module_name, version)
# Download the specified module.

fetch_module() {
    url=$1
    module=$2
    version=$3

    echo =======================================================
    echo Building $module version $version
    echo =======================================================
    echo

    if [ ! -e $PACKAGES_DIR/$module-$version.tar.gz ]; then
        echo Downloading tar file...
        download_file $url $module-$version.tar.gz
    fi

    echo Extracting...
    cd $BUILD_DIR

    if ! extract_targz $PACKAGES_DIR/$module-$version.tar.gz; then
        rm -f $PACKAGES_DIR/$module-$version.tar.gz

        echo Archive failed to extract and is possibly corrupted.
        echo Please run this script again.
        exit
    fi
}

# build_module(module_dir, args)
# Build the specified module.

build_module() {
    module=$1
    args=$2

    echo Building module...
    cd "$BUILD_DIR/$module"
    (./configure --with-sdl-prefix=$SDL_PREFIX --prefix=$INSTALL_DIR $args) || exit
    make || exit

    # Install the package
    echo $INSTALL_MESSAGE
    $INSTALL_COMMAND make install || exit

    # Remove any libtool .la files that were installed by the build - they
    # aren't needed and can cause build problems with dependency ordering
    # when cross-compiling to MingW.
    rm -f $INSTALL_DIR/lib/*.la

    echo Build complete.
    echo 
}

# fetch_and_build_module(base_url, module_name, version, args)
# Build a module, downloading from http:

fetch_and_build_module() {
    url=$1
    module=$2
    version=$3
    args=$4

    fetch_module "$url" "$module" "$version"
    build_module "$module-$version" "$args"
}

autogen_module() {
    module=$1

    cd "$BUILD_DIR/$module"

    # This is what is normally found in the autogen.sh script.  The
    # commands are run here directly as some slight tweaks are needed.

    mkdir autotools

    aclocal -I "$SDL_PREFIX/share/aclocal" || exit
    autoheader || exit
    automake -a -c || exit
    autoconf || exit
    automake || exit
}

# Check if a given header file is in the standard include directory or
# SDL include directory.

have_header() {
    headerfile=$1

    echo "#include <$headerfile>" | cpp $SDL_CFLAGS $CPPFLAGS > /dev/null

    result=$?

    if [ $result = 0 ]; then
        echo "Have $headerfile"
    else
        echo "Don't have $headerfile"
    fi
    
    return $result
}

usage() {
    echo
    echo "Usage:"
    echo "$0       : Install into home directory"
    echo "$0 -su   : Install globally onto system using 'su'"
    echo "$0 -sudo : Install globally onto system using 'sudo'"
    echo
    echo "Extra options:"
    echo "-git           : Build latest version from Git HEAD."
    echo "-extra-libs    : Build extra optional libraries that can make"
    echo "                 Chocolate Doom even more awesome."
    echo "-host=<spec>   : Cross-compile for the specified target."
    echo

    exit 0
}

if pattern_match "* *" "$HOME"; then
    echo
    echo "The path to your home directory contains a space:"
    echo
    echo "    HOME=$HOME"
    echo
    echo "This script will probably fail to build - reset HOME to point"
    echo "somewhere else. For example, type:"
    echo
    echo "    mkdir /home/user"
    echo "    HOME=/home/user"
    echo

    exit -1
fi

if ! have_tool gcc; then
    echo "No compiler found.  Please install gcc!" >&2
    exit -1
fi

# Parse command line arguments:

#git_build=false
git_build=true
force_build_sdl=false
build_libsamplerate=false
build_libflac=false
build_libvorbis=false
build_libpng=false

INSTALL_DIR=$CHOCOLATE_DOOM_DIR/install
INSTALL_COMMAND=
INSTALL_MESSAGE="Installing..."
GIT_CO_NAME=chocolate-doom-git
HOST_ARG=

for arg in "$@"; do
    case "$arg" in
        "-su")
            INSTALL_DIR=/usr/local
            INSTALL_COMMAND=su -c 
            INSTALL_MESSAGE="Type the root password:"
            ;;
        "-sudo")
            INSTALL_DIR=/usr/local
            INSTALL_COMMAND=sudo 
            INSTALL_MESSAGE="Type your password:"
            ;;
        -host=*)
            HOST_ARG="-$arg"
            # Build libraries from scratch when cross compiling:
            force_build_sdl=true
            ;;
        "-extra-libs")
            build_libsamplerate=true
            build_libpng=true
            build_libflac=true
            build_libvorbis=true
            ;;
        "-git")
            git_build=true
            ;;
        *)
            usage
            ;;
    esac
done

# Make all our build directories etc

mkdir $CHOCOLATE_DOOM_DIR
mkdir $PACKAGES_DIR
mkdir $BUILD_DIR

MACOSX_DEPLOYMENT_TARGET=10.5
PATH="$INSTALL_DIR/bin:$PATH"
CPPFLAGS="-I$INSTALL_DIR/include -I$INSTALL_DIR/include/SDL"
LDFLAGS="-L$INSTALL_DIR/lib $LDFLAGS"

export MACOSX_DEPLOYMENT_TARGET
export CPPFLAGS
export LDFLAGS

SDL_BUILD_OPTIONS=""

if [ `uname` = "Darwin" ]; then
    SDL_BUILD_OPTIONS="--disable-video-x11 $SDL_BUILD_OPTIONS"
    CC="gcc -m32"
    export CC
    CXX="g++ -m32"
    export CXX
    LDFLAGS="-lobjc $LDFLAGS"
else
    LDFLAGS="-Wl,-rpath -Wl,$INSTALL_DIR/lib $LDFLAGS"
fi

# Windows build?

if [ `uname` = "Cygwin" ] || pattern_match "*mingw*" "$HOST_ARG"; then

    echo
    echo "Windows build: installing supplementary DirectX headers."
    echo

    if [ ! -e $PACKAGES_DIR/directx-devel.tar.gz ]; then
        download_file http://www.libsdl.org/extras/win32/common/ \
                      directx-devel.tar.gz
    fi

    mkdir -p $INSTALL_DIR
    cd $INSTALL_DIR
    extract_targz $PACKAGES_DIR/directx-devel.tar.gz
fi

SDL_CFLAGS=
SDL_PREFIX=`sdl-config --prefix`

if [ $? = 0 ] && ! $force_build_sdl; then
    # SDL is installed on the system

    SDL_CFLAGS=`sdl-config --cflags`
else
    # SDL not installed; we must build it

    SDL_PREFIX=$INSTALL_DIR

    fetch_and_build_module http://www.libsdl.org/release/ SDL2 2.0.3 \
                           "$SDL_BUILD_OPTIONS $HOST_ARG"
fi

# Optional libraries first:

if $build_libsamplerate; then
    if $force_build_sdl || ! have_header samplerate.h; then
        fetch_and_build_module http://www.chocolate-doom.org/depends/ \
                               libsamplerate 0.1.8 "$HOST_ARG"
    fi
fi

if $build_libpng; then
    if $force_build_sdl || ! have_header png.h; then
        fetch_and_build_module http://www.chocolate-doom.org/depends/ \
                               libpng 1.6.10 "$HOST_ARG"
    fi
fi

if $build_libvorbis; then
    if $force_build_sdl || ! have_header vorbis/vorbisfile.h; then
        fetch_and_build_module http://www.chocolate-doom.org/depends/ \
                               libogg 1.3.1 "$HOST_ARG"
        fetch_and_build_module http://www.chocolate-doom.org/depends/ \
                               libvorbis 1.3.4 "$HOST_ARG"
    fi
fi

if $build_libflac; then
    if $force_build_sdl || ! have_header FLAC/stream_decoder.h; then
        flac_opts="--disable-asm-optimizations"  # Causes problems

        fetch_and_build_module http://www.chocolate-doom.org/depends/ \
                               flac 1.2.1 "$HOST_ARG $flac_opts"
    fi
fi

if $force_build_sdl || ! have_header SDL_net.h; then

    # SDL_net not installed; we must build it

    fetch_and_build_module http://www.libsdl.org/projects/SDL_net/release/ \
                           SDL2_net 2.0.0 "$HOST_ARG"
fi

if $force_build_sdl || ! have_header SDL_mixer.h; then

    # SDL_mixer not installed; we must build it
    # Disable dependencies on external libraries for sound file formats:
    mixer_opts="--disable-music-mod --disable-music-mp3 \
                --disable-music-flac-shared --disable-music-ogg-shared"

    # ...except ones we're building.
    if ! $build_libflac; then
        mixer_opts="$mixer_opts --disable-music-flac"
    fi
    if ! $build_libvorbis; then
        mixer_opts="$mixer_opts --disable-music-ogg"
    fi

    fetch_and_build_module http://www.libsdl.org/projects/SDL_mixer/release/ \
                           SDL2_mixer 2.0.0 "$HOST_ARG $mixer_opts"
fi

# Build Chocolate Doom.  We can build the stable version or check out
# the latest code from Git.

if $git_build; then
    GIT_URL=https://github.com/fragglet/chocolate-doom.git
    fetch_from_git "$GIT_URL" "$GIT_CO_NAME"

    autogen_module "$GIT_CO_NAME"

    build_module "$GIT_CO_NAME" "$HOST_ARG"
else
    # Download and build latest release.
    fetch_and_build_module \
        http://www.chocolate-doom.org/downloads/2.1.0/ \
        chocolate-doom 2.1.0 "$HOST_ARG"
fi