#!/usr/bin/env bash
# Copyright (c) 2014 Patrick Tudor
# BSD-New License
# v1.0.0 20140701 ptudor@ptudor.net
# 
# This script is used to build an iPhone library of GeographicLib.
#   http://geographiclib.sourceforge.net/html/index.html
# 
# The first assumption in this script is that the current directory 
# contains the source code, i.e.:
#   git clone -b r1.46 git://git.code.sf.net/p/geographiclib/code geographiclib146
#   cd geographiclib146
# Next, it assumes XCode is installed, see "APPROOT" below.
# After that, we explicitly name the SDK version in "sdkversion" for "SYSROOT" and "CFLAGS."
# The functions explicitly name the build architectures, armv7, armv7s, arm64, i386, and x86_64
# 
# The script expects one option of the set [arm|x86|both]
#

# where we have XCode installed
APPROOT="/Applications/Xcode.app/Contents"
# the minimum version supported
#sdkversion="7.1"
#sdkversion="8.4"
#sdkversion="9.3"
sdkversion="10.2"
# seconds since epoch as a file extension
epoch=`date +%s`

function display_usage() {
        echo "Usage: $0 [arm|x86|both]"
        exit
}

function prepare_arm() {
	echo "Preparing arm..."
	DEVROOT=$APPROOT/Developer/Platforms/iPhoneOS.platform/Developer
        # because of symlink null sdkversion should work too
	SYSROOT=$DEVROOT/SDKs/iPhoneOS${sdkversion}.sdk
	#
	CFLAGS="-arch armv7 -arch armv7s -arch arm64 -isysroot $SYSROOT -miphoneos-version-min=${sdkversion}"
	CXXFLAGS=$CFLAGS
	LDFLAGS=$CFLAGS
	#
	export CFLAGS=$CFLAGS
	export CXXFLAGS=$CXXFLAGS
	export LDFLAGS=$LDFLAGS
}

function prepare_x86() {
	echo "Preparing x86..."
	DEVROOT=$APPROOT/Developer/Platforms/iPhoneSimulator.platform/Developer
	SYSROOT=$DEVROOT/SDKs/iPhoneSimulator${sdkversion}.sdk
	#
	CFLAGS="-arch i386 -arch x86_64 -isysroot $SYSROOT -miphoneos-version-min=${sdkversion}"
	CXXFLAGS=$CFLAGS
	LDFLAGS=$CFLAGS
	#
	export  CFLAGS=$CFLAGS
	export  CXXFLAGS=$CXXFLAGS
	export  LDFLAGS=$LDFLAGS
}

function prepare_cc() {
	echo "Building library..."
	CC=$APPROOT/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang
	CXX=$APPROOT/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang++
	export  CC=$CC
	export  CXX=$CXX
}

function build_arm() {
	mkdir -p BUILD ; cd BUILD
	../configure --host=arm-apple-darwin13
	make clean && make
	file src/.libs/libGeographic.a 
	ls -lh  src/.libs/libGeographic.a 
	cp src/.libs/libGeographic.a ../libGeographic.a-arm-$epoch
	cp src/.libs/libGeographic.12.dylib ../libGeographic.dylib-arm-$epoch
	cd ..
}
function build_x86() {
	mkdir -p BUILD ; cd BUILD
	../configure --host=x86_64-apple-darwin13
	make clean && make
	file src/.libs/libGeographic.a 
	ls -lh  src/.libs/libGeographic.a 
	cp src/.libs/libGeographic.a ../libGeographic.a-x86-$epoch
	cp src/.libs/libGeographic.12.dylib ../libGeographic.dylib-x86-$epoch
	cd ..
}

function run_lipo() {
	echo "Running lipo on .a"
	lipo -output libGeographic.a-fat-$epoch -create libGeographic.a-arm-$epoch libGeographic.a-x86-$epoch
	file  libGeographic.a-fat-$epoch
	echo "Running lipo on .dylib"
	lipo -output libGeographic.dylib-fat-$epoch -create libGeographic.dylib-arm-$epoch libGeographic.dylib-x86-$epoch
	file libGeographic.dylib-fat-$epoch
	echo "All done!"
}

if [ $# -lt 1 ]
then
	display_usage
fi


case "$1" in
  arm) echo "Building arm..."
	prepare_cc
	prepare_arm
	build_arm
	;;
  x86) echo "Building x86..."
	prepare_cc
	prepare_x86
	build_x86
	;;
  both) echo "Building both arm and x86..."
	prepare_cc
	prepare_arm
	build_arm
	prepare_x86
	build_x86
	run_lipo
	;;
  *) echo "Error: No valid option found."
	display_usage
   	;;
esac