#!/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
PACKAGES_DIR=$CHOCOLATE_DOOM_DIR/packages
BUILD_DIR=$CHOCOLATE_DOOM_DIR/build

# Determine if a given program is in the PATH.

function 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.

function get_url() {
    url=$1

    if [ `have_tool curl` ]; then
        curl $url
        return
    fi

    if [ `have_tool wget` ]; then
        wget $url -O -
        return
    fi

    echo No tool available to retrieve URLs.  Please install curl or wget. >2
    exit
}

# Extract a tar.gz file.

function extract_targz() {
    file=$1

    gunzip < $1 | tar -x
}

# Download a file to the packages directory.

function 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
}

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

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

    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

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

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

    echo Build complete.
    echo 
}

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

function check_header() {
    headerfile=$1

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

    result=$?

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

function usage() {
    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'"
    exit 0
}

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

# Decide on how to install things

case "$1" in
    "-su")
        INSTALL_DIR=/usr/local
        INSTALL_COMMAND=su -c 
        INSTALL_MESSAGE="Type the root password:"
        ;;
    "-sudo")
        INSTALL_DIR=/usr/local
        INSTALL_COMMAND=sudo 
        INSTALL_MESSAGE="Type your password:"
        ;;
    "")
        INSTALL_DIR=$CHOCOLATE_DOOM_DIR/install
        INSTALL_COMMAND=
        INSTALL_MESSAGE="Installing..."
        ;;
    *)
        usage
        ;;
esac

# Make all our build directories etc

mkdir $CHOCOLATE_DOOM_DIR
mkdir $PACKAGES_DIR
mkdir $BUILD_DIR

export CFLAGS="-I$INSTALL_DIR/include/SDL $CFLAGS"
export LDFLAGS="-L$INSTALL_DIR/lib $LDFLAGS"

SDL_BUILD_OPTIONS=""

if [ `uname` = "Darwin" ]; then
    SDL_BUILD_OPTIONS="--disable-video-x11 $SDL_BUILD_OPTIONS"

    # MacOS needs the latest version of SDL_mixer: older versions have 
    # compile problems

    SDL_MIXER_VERSION=1.2.7
else
    export LDFLAGS="-Wl,-rpath -Wl,$INSTALL_DIR/lib $LDFLAGS"
    SDL_MIXER_VERSION=1.2.6
fi

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

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

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

    SDL_PREFIX=$INSTALL_DIR

    build_module http://www.libsdl.org/release/ SDL 1.2.11 "$SDL_BUILD_OPTIONS"
fi

if ! check_header SDL_net.h; then

    # SDL_net not installed; we must build it

    build_module http://www.libsdl.org/projects/SDL_net/release/ SDL_net 1.2.6 ""
fi

if ! check_header SDL_mixer.h; then

    # SDL_mixer not installed; we must build it

    build_module http://www.libsdl.org/projects/SDL_mixer/release/ SDL_mixer $SDL_MIXER_VERSION ""
fi

# There is not yet a version of chocolate doom on sourceforge that runs on
# os x
#build_module http://dl.sourceforge.net/sourceforge/chocolate-doom/ chocolate-doom 0.1.4 ""

build_module http://www.soulsphere.org/ chocolate-doom 0.2.0 ""

cd $CHOCOLATE_DOOM_DIR
ln -sf $INSTALL_DIR/games/chocolate-doom chocolate-doom
ln -sf $INSTALL_DIR/games/chocolate-server chocolate-server
ln -sf $INSTALL_DIR/games/chocolate-setup chocolate-setup