#!/bin/bash

# Dependency check
command -v jq > /dev/null && true || printf "\033[1;31mInstall jq, then come back.\n"
command -v jq > /dev/null && true || exit
command -v tailscale > /dev/null && true || printf "\033[1;31mInstall Tailscale, then come back.\n"
command -v tailscale > /dev/null && true || exit

# Define useful variables
tailscaleStatus=`tailscale status --json`

isTailscaleUp=`echo $tailscaleStatus | jq .Self.Online`
tailnetName=`echo $tailscaleStatus | jq -r .CurrentTailnet.Name`
tailscaleVersion=`echo $tailscaleStatus | jq -r .Version`
tailscaleIPs=`echo $tailscaleStatus | jq -r '.TailscaleIPs | join(", ")'`
tailscalePeerCount=`echo $tailscaleStatus | jq -r '.Peer | length'`
tailscaleOnlinePeerCount=`echo $tailscaleStatus | jq -r '[.Peer[] | select(.Online == true)] | length'`
tailscaleOfflinePeerCount=`echo $tailscaleStatus | jq -r '[.Peer[] | select(.Online == false)] | length'`
tailscaleExitNodesCount=`echo $tailscaleStatus | jq -r '[.Peer[] | select(.ExitNodeOption == true)] | length'`
tailscaleIsExitNode=`echo $tailscaleStatus | jq -r .Self.ExitNode`
tailscaleCanBeExitNode=`echo $tailscaleStatus | jq -r .Self.ExitNodeOption`
tailscaleDeviceID=`echo $tailscaleStatus | jq -r .Self.ID`
tailscaleUserID=`echo $tailscaleStatus | jq -r .Self.UserID`
tailscaleIsMagicDNSEnabled=`echo $tailscaleStatus | jq -r .CurrentTailnet.MagicDNSEnabled`
tailscaleMagicDNSHostname=`echo $tailscaleStatus | jq -r .CurrentTailnet.MagicDNSSuffix`
tailscaleLoginName=`echo $tailscaleStatus | jq -r '.Self.UserID as $userID | .User[] | select(.ID == $userID) | .LoginName'`
tailscaleUserCount=`echo $tailscaleStatus | jq -r '.Peer | length'`
tailscaleAPIURL=`echo $tailscaleStatus | jq -r '.Self.PeerAPIURL[0]'`

# Show content
printf "\033[0;38;5;248m      oooooooo        oooooooo        oooooooo          \033[1;37m$tailnetName\033[0;38;5;248m\n"
printf "     oooooooooo      oooooooooo      oooooooooo         \033[1;37m--------------\033[0;38;5;248m\n"
printf "    oooooooooooo    oooooooooooo    oooooooooooo        \033[1;37mVersion: \033[0;37m$tailscaleVersion\033[0;38;5;248m\n"
printf "     oooooooooo      oooooooooo      oooooooooo         \033[1;37mIP addresses: \033[0;37m$tailscaleIPs\033[0;38;5;248m\n"
printf "      oooooooo        oooooooo        oooooooo          \033[1;37mDevice count: \033[0;37m$tailscalePeerCount ($tailscaleOnlinePeerCount online, $tailscaleOfflinePeerCount offline, $tailscaleExitNodesCount exit node/s)\033[0;38;5;248m\n"
printf "                                                        \033[1;37mIs exit node: \033[0;37m$tailscaleIsExitNode\033[0;38;5;248m\n"
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || printf "\033[0;38;5;248m"
printf "      oooooooo        oooooooo        oooooooo          \033[1;37mAllowed to be exit node: \033[0;37m$tailscaleCanBeExitNode\033[0;38;5;248m\n"
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || printf "\033[0;38;5;248m"
printf "     oooooooooo      oooooooooo      oooooooooo         \033[1;37mDevice ID: \033[0;37m$tailscaleDeviceID\033[0;38;5;248m\n"
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || printf "\033[0;38;5;248m"
printf "    oooooooooooo    oooooooooooo    oooooooooooo        \033[1;37mUser ID: \033[0;37m$tailscaleUserID\033[0;38;5;248m\n"
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || printf "\033[0;38;5;248m"
printf "     oooooooooo      oooooooooo      oooooooooo         \033[1;37mMagicDNS enabled: \033[0;37m$tailscaleIsMagicDNSEnabled\033[0;38;5;248m\n"
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || printf "\033[0;38;5;248m"
printf "      oooooooo        oooooooo        oooooooo          \033[1;37mMagicDNS hostname: \033[0;37m$tailscaleMagicDNSHostname\033[0;38;5;248m\n"
printf "                                                        \033[1;37mUser login name: \033[0;37m$tailscaleLoginName\033[0;38;5;248m\n"
printf "\033[0;38;5;248m      oooooooo        "
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || false
printf "oooooooo        "
printf "\033[0;38;5;248moooooooo          \033[1;37mTailnet user count: \033[0;37m$tailscaleUserCount\033[0;38;5;248m\n"
printf "\033[0;38;5;248m     oooooooooo      "
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || false
printf "oooooooooo      "
printf "\033[0;38;5;248moooooooooo         \033[1;37mPeer API URL: \033[0;37m$tailscaleAPIURL\033[0;38;5;248m\n"
printf "\033[0;38;5;248m    oooooooooooo    "
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || false
printf "oooooooooooo    "
printf "\033[0;38;5;248moooooooooooo\n"
printf "\033[0;38;5;248m     oooooooooo      "
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || false
printf "oooooooooo      "
printf "\033[0;38;5;248moooooooooo         \033[40m   \033[41m   \033[42m   \033[43m   \033[44m   \033[45m   \033[46m   \033[47m   \033[m\n"
printf "\033[0;38;5;248m      oooooooo        "
[[ "$isTailscaleUp" == "true" ]] && printf "\033[1;37m" || false
printf "oooooooo        "
printf "\033[0;38;5;248moooooooo          \033[100m   \033[101m   \033[102m   \033[103m   \033[104m   \033[105m   \033[106m   \033[107m   \033[m\n\n\n"