#!/bin/bash

set -o errexit -o pipefail -o noclobber -o nounset

# Test if getopt exists
command -v getopt >/dev/null 2>&1 || { echo "can't execute getopt";  exit 1; }

# Test if getopt works
! getopt --test 2> /dev/null
[[ ${PIPESTATUS[0]} -ne 4 ]] && { exit 2; }

# List of available options
OPTIONS=g:t:qcfs:b:o:
LONGOPTS=generator:,type:,qtcreator,cmake,force,source-dir:,build-dir:,output-dir:

# Parse options
! PARSED=$(getopt --options=$OPTIONS --longoptions=$LONGOPTS --name "$0" -- "$@")
[[ ${PIPESTATUS[0]} -ne 0 ]] && exit 3

# Read getopt's output to handle the quoting right
eval set -- "$PARSED"

# Default generator
GENERATOR="Unix Makefiles"

# Generate single build type
SINGLE_TYPE="n"

# Generate QtCreator build types
QTCREATOR="n"

# Generate CMake build types
CMAKE="n"

# Force destructive actions
FORCE="n"

# Default source directory is two levels upper
SOURCE_DIR="$(dirname -- "$(dirname -- "$(pwd)")")"

# Default build directory is _build
BUILD_DIR="${SOURCE_DIR}/_build"

# Default output directory is _output
OUTPUT_DIR="${SOURCE_DIR}/_output"

while true; do
	case "$1" in
		-g|--generator)
			GENERATOR="$2"
			shift 2
			;;
		-t|--type)
			SINGLE_TYPE="$2"
			shift 2
			;;
		-q|--qtcreator)
			QTCREATOR="y"
			shift
			;;
		-c|--cmake)
			CMAKE="y"
			shift
			;;
		-f|--force)
			FORCE="y"
			shift
			;;
		-s|--source-dir)
			SOURCE_DIR="$2"
			shift 2
			;;
		-b|--build-dir)
			BUILD_DIR="$2"
			shift 2
			;;
		-o|--output-dir)
			OUTPUT_DIR="$2"
			shift 2
			;;
		--)
			shift
			break
			;;
		*)
			echo "Programming error"
			exit 3
			;;
	esac
done

CMAKE_ARGS=""
[ ${#@} -gt 0 ] && CMAKE_ARGS=("${@}")

[ ! -f "${SOURCE_DIR}/CMakeLists.txt" ] && { echo "Source directory does not contain CMakeLists.txt"; exit 4; }

if [ "x${SINGLE_TYPE}" != "xn" ]; then
	case "${SINGLE_TYPE}" in
		None|Debug|Release|Profile|RelWithDebInfo|MinSizeRel)
			true
			;;
		*)
			echo "Wrong CMake build type"
			exit 6
			;;
	esac
fi

export CMAKE
export QTCREATOR
export GENERATOR
export SOURCE_DIR
export BUILD_DIR
export OUTPUT_DIR
export CMAKE_ARGS
export SINGLE_TYPE
export FORCE

CMAKE_BUILD_TYPES=(None Debug Release Profile RelWithDebInfo MinSizeRel)
QTCREATOR_BUILD_TYPES=(qtNone qtDebug qtRelease qtProfile)

generate_configuration() {
	local BUILD_TYPE="${!#}"
	local BUILD="$BUILD_TYPE"

	if [ "x$QTCREATOR" == "xy" ]; then
		case "$BUILD_TYPE" in
			qtNone)
				BUILD="unknown"
				BUILD_TYPE="None"
				;;
			qtDebug)
				BUILD="debug"
				BUILD_TYPE="Debug"
				;;
			qtRelease)
				BUILD="release"
				BUILD_TYPE="Release"
				;;
			qtProfile)
				BUILD="profile"
				BUILD_TYPE="Profile"
				;;
		esac
	fi

	GEN_DIR="${BUILD_DIR}"
	if [ "x${SINGLE_TYPE}" == "xn" ]; then
		GEN_DIR="${BUILD_DIR}/${BUILD}"
	else
		GEN_DIR="${BUILD_DIR}/${SINGLE_TYPE}"
	fi

	if [ -d "${GEN_DIR}" ]; then
		if [ "x${FORCE}" == "xy" ]; then
			rm -rf "${GEN_DIR}"
		else
			echo "Build directory '${GEN_DIR}' already exists. Use --force to remove this directory or do it manually"
			return
		fi
	fi

	mkdir -p "${GEN_DIR}"
	pushd "${GEN_DIR}" 2>/dev/null
	cmake -G "${GENERATOR}" -DCMAKE_INSTALL_PREFIX="${OUTPUT_DIR}" -DCMAKE_BUILD_TYPE="${BUILD_TYPE}" "${CMAKE_ARGS[@]}" "${SOURCE_DIR}"
	if [ "x$GENERATOR" == "xNinja" ]; then
		# Generate fake Makefile, so make can run ninja build
		cat > Makefile <<EOF
.PHONY: build
%:
	@ninja \$@
build:
	@ninja
EOF
	fi
	popd 2>/dev/null
}

export -f generate_configuration

if [ "x$SINGLE_TYPE" != "xn" ]; then
	BUILD_TYPES=("${SINGLE_TYPE}")
else
	[ "x$QTCREATOR" == "xy" ] && BUILD_TYPES=("${QTCREATOR_BUILD_TYPES[@]}")
	[ "x$CMAKE" == "xy" ] && BUILD_TYPES=("${CMAKE_BUILD_TYPES[@]}")
fi

if [ ${#BUILD_TYPES[@]} -eq 0 ]; then
	echo "No build type selected."
	echo "Use -c for default CMake build types"
	echo "Use -q for build types for QtCreator"
	echo "Use -t name for build with type 'name'"
	exit 0
fi

# Try to work in parallel
if [ -x "$(command -v parallel)" ]; then
	PV=$(parallel --version | head -n 1 | awk '{ print $3; }')
	if [ "$PV" -lt "20131121" ]; then
		parallel --delay 2 -r generate_configuration ::: "${BUILD_TYPES[@]}"
	elif [ "$PV" -lt "20141023" ]; then
		parallel --delay 2 -r --no-notice generate_configuration ::: "${BUILD_TYPES[@]}"
	else
		parallel --delay 2 -r --will-cite generate_configuration ::: "${BUILD_TYPES[@]}"
	fi
else
	for T in "${BUILD_TYPES[@]}"; do generate_configuration "${T}"; done
fi