#!/usr/bin/env bash

red='\033[0;31m'
green='\033[0;32m'
yellow='\033[0;33m'
plain='\033[0m'

cur_dir=$(pwd)

# check root
[[ $EUID -ne 0 ]] && echo -e "${red}错误：${plain} 必须使用root用户运行此脚本！\n" && exit 1

# check os
if [[ -f /etc/redhat-release ]]; then
    release="centos"
elif cat /etc/issue | grep -Eqi "debian"; then
    release="debian"
elif cat /etc/issue | grep -Eqi "ubuntu"; then
    release="ubuntu"
elif cat /etc/issue | grep -Eqi "centos|red hat|redhat"; then
    release="centos"
elif cat /proc/version | grep -Eqi "debian"; then
    release="debian"
elif cat /proc/version | grep -Eqi "ubuntu"; then
    release="ubuntu"
elif cat /proc/version | grep -Eqi "centos|red hat|redhat"; then
    release="centos"
else
    echo -e "${red}未检测到系统版本，请联系脚本作者！${plain}\n" && exit 1
fi

if [ $(getconf WORD_BIT) != '32' ] && [ $(getconf LONG_BIT) != '64' ] ; then
    echo "本软件不支持 32 位系统(x86)，请使用 64 位系统(x86_64)，如果检测有误，请联系作者"
    exit -1
fi

os_version=""

# os version
if [[ -f /etc/os-release ]]; then
    os_version=$(awk -F'[= ."]' '/VERSION_ID/{print $3}' /etc/os-release)
fi
if [[ -z "$os_version" && -f /etc/lsb-release ]]; then
    os_version=$(awk -F'[= ."]+' '/DISTRIB_RELEASE/{print $2}' /etc/lsb-release)
fi

if [[ x"${release}" == x"centos" ]]; then
    if [[ ${os_version} -le 6 ]]; then
        echo -e "${red}请使用 CentOS 7 或更高版本的系统！${plain}\n" && exit 1
    fi
elif [[ x"${release}" == x"ubuntu" ]]; then
    if [[ ${os_version} -lt 16 ]]; then
        echo -e "${red}请使用 Ubuntu 16 或更高版本的系统！${plain}\n" && exit 1
    fi
elif [[ x"${release}" == x"debian" ]]; then
    if [[ ${os_version} -lt 8 ]]; then
        echo -e "${red}请使用 Debian 8 或更高版本的系统！${plain}\n" && exit 1
    fi
fi

install_base() {
    if [[ x"${release}" == x"centos" ]]; then
        yum install wget curl tar unzip -y
    else
        apt install wget curl tar unzip -y
    fi
}

install_v2ray() {
    echo -e "${green}开始安装or升级v2ray${plain}"
    bash <(curl -L -s https://install.direct/go.sh)
    if [[ $? -ne 0 ]]; then
        echo -e "${red}v2ray安装或升级失败，请检查错误信息${plain}"
        echo -e "${yellow}大多数原因可能是因为你当前服务器所在的地区无法下载 v2ray 安装包导致的，这在国内的机器上较常见，解决方式是手动安装 v2ray，具体原因还是请看上面的错误信息${plain}"
        exit 1
    fi
    systemctl enable v2ray
    systemctl start v2ray
}

close_firewall() {
    if [[ x"${release}" == x"centos" ]]; then
        systemctl stop firewalld
        systemctl disable firewalld
    elif [[ x"${release}" == x"ubuntu" ]]; then
        ufw disable
    elif [[ x"${release}" == x"debian" ]]; then
        iptables -P INPUT ACCEPT
        iptables -P OUTPUT ACCEPT
        iptables -P FORWARD ACCEPT
        iptables -F
    fi
}

install_v2-ui() {
    systemctl stop v2-ui
    cd /usr/local/
    if [[ -e /usr/local/v2-ui/ ]]; then
        rm /usr/local/v2-ui/ -rf
    fi
    last_version=$(curl -Ls "https://api.github.com/repos/sprov065/v2-ui/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
    echo -e "检测到v2-ui最新版本：${last_version}，开始安装"
    wget -N --no-check-certificate -O /usr/local/v2-ui-linux.tar.gz https://github.com/sprov065/v2-ui/releases/download/${last_version}/v2-ui-linux.tar.gz
    if [[ $? -ne 0 ]]; then
        echo -e "${red}下载v2-ui失败，请确保你的服务器能够下载Github的文件，如果多次安装失败，请参考手动安装教程${plain}"
        exit 1
    fi
    tar zxvf v2-ui-linux.tar.gz
    rm v2-ui-linux.tar.gz -f
    cd v2-ui
    chmod +x v2-ui
    cp -f v2-ui.service /etc/systemd/system/
    systemctl daemon-reload
    systemctl enable v2-ui
    systemctl start v2-ui
    echo -e "${green}v2-ui v${last_version}${plain} 安装完成，面板已启动，"
    echo -e ""
    echo -e "如果是全新安装，默认网页端口为 ${green}65432${plain}，用户名和密码默认都是 ${green}admin${plain}"
    echo -e "请自行确保此端口没有被其他程序占用，${yellow}并且确保 65432 端口已放行${plain}"
    echo -e "若想将 65432 修改为其它端口，输入 v2-ui 命令进行修改，同样也要确保你修改的端口也是放行的"
    echo -e ""
    echo -e "如果是更新面板，则按你之前的方式访问面板"
    echo -e ""
    curl -o /usr/bin/v2-ui -Ls https://raw.githubusercontent.com/sprov065/v2-ui/master/v2-ui.sh
    chmod +x /usr/bin/v2-ui
    echo -e "v2-ui 管理脚本使用方法: "
    echo -e "----------------------------------------------"
    echo -e "v2-ui              - 显示管理菜单 (功能更多)"
    echo -e "v2-ui start        - 启动 v2-ui 面板"
    echo -e "v2-ui stop         - 停止 v2-ui 面板"
    echo -e "v2-ui restart      - 重启 v2-ui 面板"
    echo -e "v2-ui status       - 查看 v2-ui 状态"
    echo -e "v2-ui enable       - 设置 v2-ui 开机自启"
    echo -e "v2-ui disable      - 取消 v2-ui 开机自启"
    echo -e "v2-ui log          - 查看 v2-ui 日志"
    echo -e "v2-ui update       - 更新 v2-ui 面板"
    echo -e "v2-ui install      - 安装 v2-ui 面板"
    echo -e "v2-ui uninstall    - 卸载 v2-ui 面板"
    echo -e "----------------------------------------------"
}

echo -e "${green}开始安装${plain}"
install_base
install_v2ray
close_firewall
install_v2-ui