#!/bin/sh

set -e

SCRIPT_VERSION="0.0.3"

echo "[linux/amd64] GoLang check new version ${SCRIPT_VERSION}
Script author: Ryabinin Sergey
dev@brigar.ru"

# Editable variable
GOWORK_PATH="/DEV/go-pack"


PROFILE_='export GOROOT=$HOME${GOWORK_PATH}/go
export PATH=$PATH:$GOROOT/bin
export GOPATH=$HOME${GOWORK_PATH}/Go
export PATH=$PATH:$GOPATH/bin'


if [[ ! -v GOROOT ]]; then
echo "Please set GOROOT
example in profile file /etc/profile or ~/.profile
${PROFILE_}
"
exit 1;
fi
if [[ ! -v GOPATH ]]; then
echo "Please set GOROOT
example in profile file /etc/profile or ~/.profile
/etc/profile
${PROFILE_}
"
exit 1;
fi

GO_VERSION="$(curl -s https://golang.org/dl/|grep 'Stable versions' -C4|grep '<div class="toggleVisible" id="'|sed 's/<div class="toggleVisible" id="//'|sed 's/">//')"
GO_VERSION_SYS=$(go version|grep -E -o "go[0-9]+\.[0-9]+\.[0-9]")
if [ "${GO_VERSION_SYS}" == "${GO_VERSION}" ]; then
echo "No new version Golang"
echo "Your version Golang: [${GO_VERSION_SYS}] fetched version: [${GO_VERSION}]"
exit 0;
else
echo "Golang new version is available"
echo "Your version Golang: [${GO_VERSION_SYS}] fetched version: [${GO_VERSION}]"
fi

HASHE=$(curl -s https://golang.org/dl/|grep "${GO_VERSION}.linux-amd64.tar.gz" -A5)
GO_SHA256=$(echo ${HASHE} | grep -Po "<tt>(.*)</tt>" | sed 's@<\([^<>][^<>]*\)>\([^<>]*\)</\1>@\2@g')
#~ GOFILE="$(curl -s https://golang.org/dl/|grep "${GO_VERSION}.linux-amd64.tar.gz" | grep -Po '(?<=href=")[^"](.*)(?=")')"
GOFILE="${GO_VERSION}.linux-amd64.tar.gz"

echo "latest GO_VERSIONion: ${GO_VERSION}"
echo "url: https://golang.or/dl/g$GOFILE"
echo "sha256: ${GO_SHA256}"

cd /tmp;
echo "КАЧАЕМ: https://golang.org/dl/${GOFILE}"
curl -L "https://golang.org/dl/${GOFILE}" -o "/tmp/${GOFILE}"
GO_SHA256_CRP=$(sha256sum ${GOFILE}|awk '{print $1}')
if [ "${GO_SHA256_CRP}" == "${GO_SHA256}" ]; then
echo "Ok sum: ${GOFILE}";
rm -rf $HOME/DEV/go-pack/go && tar -C $HOME/DEV/go-pack -xzf ${GOFILE}
unset GO_VERSION
unset GO_SHA256
unset GO_SHA256_CRP
fi