#!/bin/bash

TARGET_DIR=$PWD/../unity_build
BUILD_DIR=$TARGET_DIR/build
SETUP=false
UPDATE=false
CLEAN=false
NUM_JOBS=$(( `grep -c ^processor /proc/cpuinfo` + 1 ))
LENSES="applications mockmusic mockvideos"

# verified working revisions
LIBUNITY_REV=215
UNITY_REV=3260
HUD_REV=252

usage() {
    echo "usage: build_unity [OPTIONS]\n"
    echo "Script to build Unity on Ubuntu 12.10.\n"
    echo "OPTIONS:"
    echo "  -s, --setup   Setup the build environment and branch Unity"
    echo "  -u, --update  Update Unity's source code"
    echo "  -c, --clean   Clean build trees before building"
    exit 1
}

set -- `getopt -n$0 -u -a --longoptions="setup,update,clean,help" "such" "$@"`

# FIXME: giving incorrect arguments does not call usage and exit
while [ $# -gt 0 ]
do
    case "$1" in
       -s|--setup)   SETUP=true;;
       -u|--update)  UPDATE=true;;
       -c|--clean)   CLEAN=true;;
       -h|--help)    usage;;
       --)           shift;break;;
    esac
    shift
done

install_utils() {
    echo "Installing build utilities.."
    sudo apt-get install devscripts equivs || exit 4
}

mk_build_deps() {
    echo "Installing build dependencies.."
    cd $TARGET_DIR
    sudo mk-build-deps -B -i $TARGET_DIR/libunity/debian/control || exit 5
    sudo mk-build-deps -B -i $TARGET_DIR/unity/debian/control || exit 6
    sudo mk-build-deps -B -i $TARGET_DIR/hud/debian/control || exit 7
}

branch_libunity() {
    echo "Branching libunity.."
    bzr branch lp:libunity/phablet $TARGET_DIR/libunity || exit 8
}

branch_unity() {
    echo "Branching Unity.."
    bzr branch lp:unity/phablet-mods $TARGET_DIR/unity || exit 9
}

branch_hud() {
    echo "Branching hud.."
    bzr branch lp:hud $TARGET_DIR/hud || exit 10
}

update_unity() {
    echo "Updating Unity.."
    bzr pull -d $TARGET_DIR/unity || exit 11
}

update_libunity() {
    echo "Updating libunity.."
    bzr pull -d $TARGET_DIR/libunity || exit 12
}

update_hud() {
    echo "Updating hud"
    bzr pull -d $TARGET_DIR/hud || exit 13
}

compile_libunity() {
    echo "Configuring libunity.."

    if $CLEAN; then bzr clean-tree -d $TARGET_DIR/libunity --quiet --unknown --ignored --force; fi

    cd $TARGET_DIR/libunity
    bzr revert --quiet -r $LIBUNITY_REV || exit 14

    mkdir $TARGET_DIR/libunity/build
    cd $TARGET_DIR/libunity/build

    ../autogen.sh --prefix $BUILD_DIR --disable-debug || exit 15

    echo "Building libunity and installing in " $BUILD_DIR
    make -j$NUM_JOBS install || exit 16

}

compile_unity_core() {
    echo "Configuring Unity.."

    if $CLEAN; then bzr clean-tree -d $TARGET_DIR/unity --quiet --unknown --ignored --force; fi

    cd $TARGET_DIR/unity
    bzr revert --quiet -r $UNITY_REV || exit 17

    mkdir $TARGET_DIR/unity/build
    cd $TARGET_DIR/unity/build

    PKG_CONFIG_PATH=$BUILD_DIR/lib/pkgconfig:$PKG_CONFIG_PATH cmake $TARGET_DIR/unity -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$BUILD_DIR -DCOMPIZ_PLUGIN_INSTALL_TYPE=local -DGSETTINGS_LOCALINSTALL=ON || exit 18

    echo "Building UnityCore and installing in " $BUILD_DIR
    cd UnityCore
    make -j$NUM_JOBS install || exit 19

}

compile_hud() {
    echo "Configuring hud.."

    if $CLEAN; then bzr clean-tree -d $TARGET_DIR/hud --quiet --unknown --ignored --force; fi

    cd $TARGET_DIR/hud
    bzr revert -r $HUD_REV || exit 20

    mkdir $TARGET_DIR/hud/build
    cd $TARGET_DIR/hud/build

    cmake $TARGET_DIR/hud/ -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$BUILD_DIR -DCMAKE_INSTALL_LIBDIR=lib -DLOCAL_INSTALL=ON -DENABLE_TESTS=OFF || exit 21

    echo "Building hud and installing in " $BUILD_DIR
    make install || exit 22

}

link_lenses() {
    echo "Linking system lenses.."
    mkdir -p $BUILD_DIR/share/unity/lenses/
    for LENS in $LENSES; do
        [ -e $BUILD_DIR/share/unity/lenses/$LENS ] || ln -ivs /usr/share/unity/lenses/$LENS $BUILD_DIR/share/unity/lenses/$LENS
    done
}

if $SETUP; then
    echo "Setting up environment for building Unity.."
    install_utils
    mkdir -p $TARGET_DIR
    branch_libunity
    branch_unity
    branch_hud
    mk_build_deps
elif $UPDATE; then
    update_libunity
    update_unity
    update_hud
    mk_build_deps
else
    if $CLEAN; then rm -Rf $BUILD_DIR; fi
    mkdir -p $BUILD_DIR
    compile_libunity
    compile_unity_core
    compile_hud
    link_lenses
fi