#!/bin/bash
#
# for windows and Mac check the README
#
BIN_NAME=acme-downloader
PATH=$PATH:$(go env GOPATH)/bin
GOPATH=$(go env GOPATH)
PROG_VERSION="1.0"
BUILDTIME=$(date -u '+%Y-%m-%d_%H:%M:%S')
export BIN_NAME PATH GOPATH PROG_VERSION BUILDTIME

REPO_DIR=$(dirname $0)
if [ "$REPO_DIR" = '.' ]; then
    REPO_DIR=`pwd`
fi
ln -sf "$REPO_DIR" "${GOPATH}/src/"
REPO_NAME=$(basename "$REPO_DIR")
cd "${GOPATH}/src/$REPO_NAME"

usage() {
    echo "Usage: $(basename $0)"
    echo "    -h | --help [Print this help and exit]"
    echo "    --os=OS     (Compile binary for this OS)"
    echo "    --arch=ARCH (Compile binary for this architecture)"
    echo ""
    echo "    Below is a list of supported combinations (1st column: OS / 2nd column: Arch):"
    go tool dist list|awk -F'/' '{printf "OS: "$1"\011=> Arch: "$2"\n"}'
    exit
}

OPTS=$(getopt -o "h" --longoptions "help,platform:,arch:" -- "$@")
eval set -- "$OPTS"

while true; do
    case "$1" in
    -h | --help)
        usage
        ;;
    --platform)
        shift
        PLATFORM="$1"
        ;;
    --arch)
        shift
        ARCH="$1"
        ;;
    --)
        shift
        break
        ;;
    esac
    shift
done

if [ -z $PLATFORM -o -z $ARCH ]; then
    echo -e "\nYou need to supply platform and architecture\n"
    usage
fi

if [ "$PLATFORM" == "windows" ]; then
    $BIN_NAME = "${BIN_NAME}.exe"
fi

EXECUTABLE_PATH="${GOPATH}/bin/${PLATFORM}_${ARCH}/${BIN_NAME}"

run_upx() {
    if ! which upx &>/dev/null; then
        echo "please download upx here https://github.com/upx/upx/releases"
        echo "and store the executable within your \$PATH"
        exit
    fi
    upx --brute "$EXECUTABLE_PATH"
}

# env GOOS=windows GOARCH=amd64 go build -ldflags "-s -w -X main.appVersion=${PROG_VERSION} -X main.buildTime=${BUILDTIME}" .
env GOOS=$PLATFORM GOARCH=$ARCH go get -ldflags "-s -w -X main.appVersion=${PROG_VERSION} -X main.buildTime=${BUILDTIME}" .
if [ $? -gt 0 ]; then
    echo -e "\nthere was an error while compiling the code\n"
    exit
fi

while true; do
    echo -e "\nUPX degrades performances but in the case of acme-downloader it is not noticeable"
    echo -e "UPX may or may not work for a specific platform (I haven't tried them)\n"
    read -p "Do you wish to run upx against ${BIN_NAME}? (y/n) " yn
    case $yn in
    [Yy]*)
        echo ""
        run_upx
        break
        ;;
    [Nn]*) break ;;
    *)
        echo "Please answer Y|y or N|n."
        ;;
    esac
done

echo -e "\nthe binary was compiled and it is avilable as:\n - \"$EXECUTABLE_PATH\"\n"