#!/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.

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

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

# 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_svn(svn_url, checkout_dir_name)
# Check module out from subversion.

fetch_from_svn() {
    svn_url=$1
    checkout_dir_name=$2

    checkout_path="$BUILD_DIR/$checkout_dir_name"

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

        if ! svn checkout "$svn_url" "$checkout_path"; then
            echo "Failed to check out $checkout_dir_name from Subversion"
            exit
        fi
    else
        svn update "$checkout_path"
    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

    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.

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
}

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

# Decide on how to install things

svn_build=false
INSTALL_DIR=$CHOCOLATE_DOOM_DIR/install
INSTALL_COMMAND=
INSTALL_MESSAGE="Installing..."

for arg in "$@"; do
    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:"
            ;;
        
        "-svn")
            svn_build=true
            ;;
        *)
            usage
            ;;
    esac
done

# Make all our build directories etc

mkdir $CHOCOLATE_DOOM_DIR
mkdir $PACKAGES_DIR
mkdir $BUILD_DIR

MACOSX_DEPLOYMENT_TARGET=10.4
PATH="$INSTALL_DIR/bin:$PATH"
CFLAGS="-I$INSTALL_DIR/include/SDL $CFLAGS"
LDFLAGS="-L$INSTALL_DIR/lib $LDFLAGS"

export MACOSX_DEPLOYMENT_TARGET
export CFLAGS
export LDFLAGS

SDL_BUILD_OPTIONS=""

if [ `uname` = "Darwin" ]; then
    SDL_BUILD_OPTIONS="--disable-video-x11 $SDL_BUILD_OPTIONS"
else
    LDFLAGS="-Wl,-rpath -Wl,$INSTALL_DIR/lib $LDFLAGS"
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

    fetch_and_build_module http://www.libsdl.org/release/ SDL 1.2.14 "$SDL_BUILD_OPTIONS"
fi

if ! check_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/ SDL_net 1.2.6 ""
fi

if ! check_header SDL_mixer.h; then

    # SDL_mixer not installed; we must build it

    fetch_and_build_module http://www.libsdl.org/projects/SDL_mixer/release/ SDL_mixer 1.2.11 ""
fi

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

if $svn_build; then
    fetch_from_svn http://chocolate-doom.svn.sourceforge.net/svnroot/chocolate-doom/trunk/chocolate-doom chocolate-doom-svn

    autogen_module chocolate-doom-svn

    build_module chocolate-doom-svn ""
else
    # Build v1.4.0

    fetch_and_build_module http://mesh.dl.sourceforge.net/project/chocolate-doom/chocolate-doom/1.4.0/ chocolate-doom 1.4.0 ""
fi

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