#!/bin/bash

SYSTEMS=( windows linux freebsd )

ARCHS=( 386 amd64 amd64p32 arm arm64 ppc ppc64 )

function usage() {
    echo "Usage: ${0##*/} [ -h|--help ] [ -t|--target <system> ] [ -a|--arch <arch> ]"
    echo ""
    echo " Valid systems:"
    for i in "${SYSTEMS[@]}"; do
        echo "  * ${i}"
    done
    echo ""
    echo " Valid architectures:"
    for i in "${ARCHS[@]}"; do
        echo "  * ${i}"
    done
    echo ""
    exit 1
}

options=$(getopt -n "${0##*/}" -o "ht:a:" -l "help,target:,arch:" -- "$@")

[ $? -eq 0 ] || usage

eval set -- "$options"

MAKE_TARGET="all"

while true; do

    case $1 in
    -t|--target)
        shift
        REGEX=$(echo "${SYSTEMS[@]}" | sed 's/[[:space:]]/|/g')
        [[ ! "$1" =~ ^($REGEX)$ ]] && {
            echo "Incorrect system '$1' provided"
            usage
        }
        export GOOS=$1
        ;;
    -a|--arch)
        shift
        REGEX=$(echo "${ARCHS[@]}" | sed 's/[[:space:]]/|/g')
        [[ ! "$1" =~ ^($REGEX)$ ]] && {
            echo "Incorrect architecture '$1' provided"
            usage
        }
        export GOARCH=$1
        ;;
    -h|--help) usage ;;
    --) shift
        break
        ;;
    esac
    shift
done

MESSAGE=""
if [ ! -z "${GOOS}" ]; then
    MESSAGE="[\e[34m::\e[0m] Crosscompiling for: ${GOOS}"
fi

if [ ! -z "${GOARCH}" ]; then
    MESSAGE="${MESSAGE} (${GOARCH})"
fi


[ ! -z "${MESSAGE}" ] && echo -e "" $MESSAGE

make -B ${MAKE_TARGET}