#!/bin/bash
#
#***************************************************************************
# Author: liwanggui
# Date: 2021-08-13
# FileName: install-go.sh
# Description: install go lange
# Copyright (C): 2021 All rights reserved
#***************************************************************************
#

version="1.24.2"
pkgname="go${version}.linux-amd64.tar.gz"

function install_go () {
    if [ -d "/usr/local/go" ]; then
        echo "Go already installed"
        exit 1
    fi
    
    cd /usr/local/src
    if [ ! -f "$pkgname" ]; then
        wget https://golang.google.cn/dl/$pkgname -O $pkgname
    fi
    tar xzf $pkgname -C /usr/local/
}

function config_go () {
    echo '
export GOROOT="/usr/local/go"
export GOPATH="$HOME/go"
export PATH="$PATH:$GOROOT/bin"' >> ~/.bashrc
    
    /usr/local/go/bin/go env -w GO111MODULE=on
    /usr/local/go/bin/go env -w GOPROXY="https://goproxy.cn,direct"
    echo
    echo ">>> source ~/.bashrc"
    echo
}

function main () {
    if [[ $(uname -s) != "Linux" ]];then
        echo "不支持此系统平台，只支持 linux 系统"
        exit 1
    fi

    case "$1" in 
        config)
           config_go 
	   ;;
	*)
           install_go
	   config_go
	   ;;
    esac
}

main $@