#!/bin/bash -e

# Build the syncthing library
ORIG=$(pwd)
mkdir -p bin

# Load submodules
if [ ! -f "ext/syncthing/src/github.com/syncthing/syncthing/.git" ]; then
	git submodule update --init --recursive
fi

# Use own Go instance, installing it if missing.
mkdir -p "build"
tmpgo='build/go'
if [ ! -f "$tmpgo/bin/go" ]; then
	# Download GOLANG v1.3.3
	wget -O go.src.tar.gz https://golang.org/dl/go1.3.3.src.tar.gz
	sha1=$(sha1sum go.src.tar.gz)
	if [ "$sha1" != "b54b7deb7b7afe9f5d9a3f5dd830c7dede35393a  go.src.tar.gz" ]; then
		echo "go.src.tar.gz SHA1 checksum does not match!"
		exit 1
	fi
	mkdir -p $tmpgo
	tar -xzf go.src.tar.gz --strip=1 -C $tmpgo
	rm go.src.tar.gz
	# Build GO for host
	pushd $tmpgo/src
	./make.bash --no-clean
	popd
fi
# Add GO to the environment
export GOROOT="$(pwd)/$tmpgo"

# Add GO compiler to PATH
export PATH=$PATH:$GOROOT/bin

# Check whether GOLANG is compiled with cross-compilation for 386
if [ ! -f $GOROOT/bin/linux_386/go ]; then
	pushd $GOROOT/src
	# Build GO for cross-compilation
	GOOS=linux GOARCH=386 ./make.bash --no-clean
	popd
fi

# Check whether GOLANG is compiled with cross-compilation for arm
if [ ! -f $GOROOT/bin/linux_arm/go ]; then
	pushd $GOROOT/src
	# Build GO for cross-compilation
	GOOS=linux GOARCH=arm ./make.bash --no-clean
	popd
fi

# Setup GOPATH
cd "ext/syncthing/"
export GOPATH="$(pwd)"

# Install godep
$GOROOT/bin/go get github.com/tools/godep
export PATH="$(pwd)/bin":$PATH

# Setup syncthing and clean
export ENVIRONMENT=android
cd src/github.com/syncthing/syncthing
$GOROOT/bin/go run build.go clean

# X86
$GOROOT/bin/go run build.go -goos linux -goarch 386 -no-upgrade build
mv syncthing $ORIG/bin/syncthing-x86
$GOROOT/bin/go run build.go clean

# ARM-7
$GOROOT/bin/go run build.go -goos linux -goarch armv7 -no-upgrade build
mv syncthing $ORIG/bin/syncthing-armeabi-v7a
$GOROOT/bin/go run build.go clean

# ARM-5
$GOROOT/bin/go run build.go -goos linux -goarch armv5 -no-upgrade build
mv syncthing $ORIG/bin/syncthing-armeabi
$GOROOT/bin/go run build.go clean