#!/bin/bash

URL="https://go.dev/dl/"

OS=$(uname -a | awk '{print $1}')
ARCH=$(uname -m)

if [[ "$ARCH" == "x86_64" ]] ; then
    ARCH="amd64"
fi

if [[ "$ARCH" == "aarch64" ]] ; then
    ARCH="arm64"
fi

GOFILE=$(curl "$URL" \
            | grep 'class="download"' \
            | grep "\.tar\.gz" \
            | sed -E 's@^.*/dl/(go[1-9].+\.tar\.gz)".*$@\1@' \
            | grep -i "$OS" \
            | grep -i "$ARCH" \
            | head -1)

GOURL=$(curl "${URL}${GOFILE}" \
        | sed -E 's@^.*href="(.*\.tar\.gz)".*$@\1@')

echo "Install GO from : $GOURL" 1>&2

mkdir -p /usr/local
cd /usr/local

curl "$GOURL" \
    | tar zxf -