#!/bin/bash

scriptdir=$(dirname $(realpath $0))
tempdir="/tmp"

# ============================================================

git_clone() {
    local repo=$1
    local dir=$2

    if [ ! -d "$dir" ]; then
        if [ "$3" = "--norecursive" ]; then
            git clone --single-branch "$github/$repo" $dir
        else
            git clone --single-branch --recursive "$github/$repo" $dir
        fi
    fi
}

# ============================================================

check_google_access() {
    abroad=0
    local response=$(curl -s -o /dev/null -w "%{http_code}" -m 5 "http://www.google.com")

    if [ "$response" -eq 200 ]; then
        abroad=1
        echo "Internet: abroad"
        github="https://github.com"
    else
        abroad=0
        echo "Internet: internal"
        github="https://g.nano.ac/https://github.com"
    fi
}

configure_ssh() {
    [ -f ~/.ssh/authorized_keys ] && return

    read -p "要配置 authorized_keys 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        mkdir -p ~/.ssh
        cp $scriptdir/files/authorized_keys ~/.ssh/authorized_keys
    fi
}

configure_ssh_keygen() {
    [ -f ~/.ssh/id_ed25519.pub ] && return

    read -p "要生成 sshkey 吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        mkdir -p ~/.ssh
        read -p "sshkey 的名字: " sshkeyname
        ssh-keygen -t ed25519 -C $sshkeyname
    fi
}

configure_nano() {
    [ -f ~/.nanorc ] && return

    read -p "要配置 nano 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        sudo apt install nano -y
        cp $scriptdir/files/.nanorc ~/.nanorc
    fi
}

configure_vim() {
    [ -f ~/.vimrc ] && return

    read -p "要配置 vim 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        sudo apt install vim -y
        cp $scriptdir/files/.vimrc ~/.vimrc
    fi
}

configure_tuna() {
    [ $abroad -eq 1 ] && return

    read -p "要切换 Tuna 源吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        python3 $scriptdir/files/oh-my-tuna.py
        sudo python3 $scriptdir/files/oh-my-tuna.py
    fi
}

configure_apt_upgrade() {
    read -p "要运行 apt upgrade 吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        sudo apt update
        sudo apt upgrade -y
        sudo apt autoremove -y
    fi
}

configure_apt_install() {
    read -p "要运行 apt install 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        sudo apt update
        sudo apt install tmux git curl htop net-tools tcptraceroute tar unzip -y
        sudo apt install hexyl bat neofetch fd-find fzf -y

        sudo apt install exa -y
        if [ $? -ne 0 ]; then
            unzip $scriptdir/files/exa-linux-x86_64-v0.10.1.zip -d $tempdir/exa
            sudo cp $tempdir/exa/bin/* /usr/local/bin/
            sudo cp $tempdir/exa/man/* /usr/share/man/man1/
            sudo cp $tempdir/exa/completions/exa.zsh /usr/local/share/zsh/site-functions
            rm $tempdir/exa -r
        fi
    fi
}

configure_zsh() {
    [ -f ~/.zshrc ] && return

    read -p "要配置 zsh 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        sudo apt install zsh -y
        git_clone ohmyzsh/ohmyzsh ~/.oh-my-zsh
        RUNZSH=no ZSH=~/.oh-my-zsh $scriptdir/files/install-ohmyzsh.sh

        git_clone zsh-users/zsh-autosuggestions ~/.oh-my-zsh/plugins/zsh-autosuggestions
        git_clone zsh-users/zsh-syntax-highlighting ~/.oh-my-zsh/plugins/zsh-syntax-highlighting
        git_clone paulirish/git-open ~/.oh-my-zsh/plugins/git-open
        sudo apt install autojump -y

        cp $scriptdir/files/.zshrc ~/.zshrc
        cp $scriptdir/files/ys-simple.zsh-theme ~/.oh-my-zsh/themes/ys-simple.zsh-theme
    fi
}

configure_tmux() {
    [ -f ~/.tmux.conf ] && return

    read -p "要配置 tmux 吗？[Y]: " response

    if [[ -z "$response" ]] || [[ $response =~ ^[Yy]$ ]]; then
        sudo apt install tmux -y
        git_clone tmux-plugins/tpm ~/.tmux/plugins/tpm --norecursive
        git_clone tmux-plugins/tmux-sensible ~/.tmux/plugins/tmux-sensible
        git_clone tmux-plugins/tmux-yank ~/.tmux/plugins/tmux-yank
        git_clone tmux-plugins/tmux-prefix-highlight ~/.tmux/plugins/tmux-prefix-highlight
        git_clone seebi/tmux-colors-solarized ~/.tmux/plugins/tmux-colors-solarized
        cp $scriptdir/files/.tmux.conf ~/.tmux.conf
        sudo apt install xsel -y # 能够让 tmux 剪切板与 terminal 同步
    fi
}

configure_iptables() {
    [ -f /etc/network/if-pre-up.d/iptables-load ] && return

    read -p "要配置 iptables 吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        sudo cp $scriptdir/files/iptables-load /etc/network/if-pre-up.d/iptables-load
        sudo chmod +x /etc/network/if-pre-up.d/iptables-load
        sudo sh /etc/network/if-pre-up.d/iptables-load
    fi
}

configure_hostname() {
    read -p "要修改 hostname 吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        read -p "hostname: " new_hostname
        echo $new_hostname | sudo tee /etc/hostname >/dev/null
    fi
}

configure_timedate() {
    read -p "要修改 时区 吗？[N]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        sudo timedatectl set-timezone Asia/Shanghai
    fi
}

configure_fail2ban() {
    [ -f /etc/fail2ban/jail.local ] && return

    read -p "要配置 fail2ban 吗？[Y]: " response

    if [[ $response =~ ^[Yy]$ ]]; then
        sudo apt install fail2ban
        sudo mkdir -p /etc/fail2ban
        sudo cp $scriptdir/files/jail.local /etc/fail2ban/jail.local
        sudo systemctl start fail2ban
        sudo systemctl enable fail2ban
        sudo fail2ban-client status sshd
    fi
}

if [[ $EUID -eq 0 ]]; then
    echo "This script should not be run as root."
    exit 1
fi

check_google_access
configure_ssh
configure_ssh_keygen
configure_nano
configure_vim
configure_tuna
configure_apt_upgrade
configure_apt_install
configure_zsh
configure_tmux
configure_iptables
# configure_hostname
configure_timedate
configure_fail2ban