#!/bin/bash

# Default options

BUILD_DIR="build"
CMAKE_GENERATOR="Unix Makefiles"
BUILD_TYPE="Release"
CMAKE_OPTIONS="$CMAKE_OPTIONS"

# Create default configs
if [ ! -d "./.localconfig" ]
then
    mkdir ".localconfig"

    touch ".localconfig/default"
    echo "#!/bin/bash" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Default configuration for configure (is always sourced)" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# CMake generator" >> ".localconfig/default"
    echo "CMAKE_GENERATOR=\"Unix Makefiles\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Build directory and build type" >> ".localconfig/default"
    echo "BUILD_DIR=\"build\"" >> ".localconfig/default"
    echo "BUILD_TYPE=\"Release\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Installation directory" >> ".localconfig/default"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DCMAKE_INSTALL_PREFIX=../install\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Build static libraries" >> ".localconfig/default"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DBUILD_SHARED_LIBS:BOOL=OFF\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Enable examples" >> ".localconfig/default"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_EXAMPLES:BOOL=ON\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Enable documentation" >> ".localconfig/default"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_DOCS:BOOL=ON\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Disable tests" >> ".localconfig/default"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_TESTS:BOOL=OFF\"" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# CMake and environment variables (e.g., search paths for external libraries)" >> ".localconfig/default"
    echo "" >> ".localconfig/default"
    echo "# Qt" >> ".localconfig/default"
    echo "#export CMAKE_PREFIX_PATH=\"\${CMAKE_PREFIX_PATH}:/opt/Qt5.2.1/5.2.1/gcc_64/\"" >> ".localconfig/default"

    touch ".localconfig/debug"
    echo "#!/bin/bash" >> ".localconfig/debug"
    echo "" >> ".localconfig/debug"
    echo "# Configuration for debug builds" >> ".localconfig/debug"
    echo "" >> ".localconfig/debug"
    echo "# Build directory and build type" >> ".localconfig/debug"
    echo "BUILD_DIR=\"\${BUILD_DIR}-debug\"" >> ".localconfig/debug"
    echo "BUILD_TYPE=\"Debug\"" >> ".localconfig/debug"

    touch ".localconfig/pack"
    echo "#!/bin/bash" >> ".localconfig/pack"
    echo "" >> ".localconfig/pack"
    echo "# Configuration for creating packages" >> ".localconfig/pack"
    echo "" >> ".localconfig/pack"
    echo "# Installation directory" >> ".localconfig/pack"
    echo "CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DCMAKE_INSTALL_PREFIX=/usr\"" >> ".localconfig/pack"
    echo "" >> ".localconfig/pack"
    echo "# Enable self-contained installation" >> ".localconfig/pack"
    echo "#CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_SELF_CONTAINED:BOOL=ON\"" >> ".localconfig/pack"
    echo "" >> ".localconfig/pack"
    echo "# Enable all components for the package" >> ".localconfig/pack"
    echo "CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_EXAMPLES:BOOL=ON\"" >> ".localconfig/pack"
    echo "CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_DOCS:BOOL=ON\"" >> ".localconfig/pack"
    echo "CMAKE_OPTIONS=\"\${CMAKE_OPTIONS} -DOPTION_BUILD_TESTS:BOOL=OFF\"" >> ".localconfig/pack"

    echo "Default configuration has been written to .localconfig"
    echo "Please review and adjust the configuration, then run again"
    echo ""
    echo "  ./configure $@"
    
    exit
fi

# Read local default options
if [ -f "./.localconfig/default" ]
then
    . ./.localconfig/default
fi

# Parse command line arguments
for ARG in "$@"
do
    # Read in configuration for that command-line argument
    CONFIGFILE="./.localconfig/$ARG"
    if [ -f "./.localconfig/$ARG" ]
    then
        . "./.localconfig/$ARG"
    elif [ -f "$HOME/.localconfig/$ARG" ]
    then
        . "$HOME/.localconfig/$ARG"
    else
        echo "Configuration \"$ARG\" not found (searched in ./.localconfig and ~/.localconfig)"
    fi
done

if [ "$CMAKE_GENERATOR_OVERRIDE" != "" ]
then
  echo "Override CMAKE_GENERATOR to $CMAKE_GENERATOR_OVERRIDE"
  CMAKE_GENERATOR="$CMAKE_GENERATOR_OVERRIDE"
fi

if [ -n "$BUILD_DIR_PREFIX" ]; then
  BUILD_DIR="${BUILD_DIR_PREFIX}-${BUILD_DIR}"
fi

# Configure build
echo "Configuring in \"$BUILD_DIR\""
echo ""

# Create build directory
if [ ! -d "$BUILD_DIR" ]
then
    mkdir -p "$BUILD_DIR"
fi

# Configure project

PREVIOUS_DIR=$(pwd)

pushd $BUILD_DIR
echo cmake -G "$CMAKE_GENERATOR" "-DCMAKE_BUILD_TYPE=$BUILD_TYPE" $CMAKE_OPTIONS "$PREVIOUS_DIR"
cmake -G "$CMAKE_GENERATOR" "-DCMAKE_BUILD_TYPE=$BUILD_TYPE" $CMAKE_OPTIONS "$PREVIOUS_DIR"
if [ $? == 0 ]
then
    echo ""
    echo "Project configured. To build the project, use";
    echo ""
    echo "  cmake --build $BUILD_DIR"
else
    echo ""
    echo "Configuration failed.";
fi
popd