# This is a generalized function to build a statically-linked release binary.
# It specifies all the Go flags needed to make that happen depending on the platform.

build(){
	OS=$1
	ARCH=$2

	# Lowercase
	OS=$(echo "$OS" | awk '{ print tolower($0) }')
	ARCH=$(echo "$ARCH" | awk '{ print tolower($0) }')

	if [ -z "${CC}" ]
	then
		export CC=gcc
	fi

	# Add .exe to Windows output
	EXE=""
	if [ "${OS}" = "windows" ]
	then
		EXE=".exe"
	fi

	if [ "${ARCH}" = "x86_64" ]
	then
	   ARCH="amd64"
	fi

	PACKAGE="$(grep module go.mod | awk '{print $2}')"
	TAG="$(git describe --tags --abbrev=0)"
	VERSION="$(echo ${TAG} | awk -F '-' '{print $NF}')"
	COMMIT_HASH="$(git rev-parse --short HEAD)"
	BUILD_TIMESTAMP="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"

	OUTPUT="${TAG}-${OS}-${ARCH}${EXE}"

	LDFLAGS="${LDFLAGS} -X '${PACKAGE}/internal/version.Version=${VERSION}'"
	LDFLAGS="${LDFLAGS} -X '${PACKAGE}/internal/version.CommitHash=${COMMIT_HASH}'"
	LDFLAGS="${LDFLAGS} -X '${PACKAGE}/internal/version.BuildTimestamp=${BUILD_TIMESTAMP}'"

	export CGO_ENABLED=1
	export CC="${CC}"
	export GOOS=$OS
	export GOARCH=$ARCH
	go build -x -v \
	   -trimpath \
	   -ldflags="-s -w ${LDFLAGS}" \
	   -o "${OUTPUT}"
}