#!/usr/bin/env bash

# ***This script was made by Clay Gomera (Drake)***
#  - Description: A simple wifi dmenu script
#  - Dependencies: dmenu, NetworkManager

## Main manu options
option1="  Turn on WiFi"
option2="  Turn off WiFi"
option3="󱛅  Disconnect WiFi"
option4="󱛃  Connect WiFi"
option5="󱛆  Setup captive portal"
option6="󱎘  Exit"
options="$option1\n$option2\n$option3\n$option4\n$option5\n$option6"

#####
## These variables will store specific information about the wirelessinterface
#####
wifi_info=$(nmcli dev | awk '/wifi/ {print $1,$3; exit}')
read -r wlan constate <<< "$wifi_info"

#####
## This function uses nmcli to turn off wifi and then sends a notification
#####
turnoff() {
    nmcli radio wifi off && notify-send "WiFi has been turned off"
}

#####
## This function uses nmcli to turn on wifi and then sends a notification
#####
turnon() {
    nmcli radio wifi on && notify-send "WiFi has been turned on"
}

#####
## This function uses nmcli and the $wlan and $constate variables to disconnect
## from the wifi network and then sends a notification
#####
disconnect() {
    if [ "$constate" = "disconnected" ]; then
        notify-send "WiFi is already disconnected"
    elif [ "$constate" = "connected" ]; then
        nmcli device disconnect "$wlan" && notify-send "Wifi has been disconnected"
    else
        exit 1
    fi
}

#####
## This function uses nmcli to first scan for available networks and then the
## $bssid variable will store the SSID of the network that the user chooses
#####
connect() {
    notify-send -t 5000 "Scanning networks..."
    nmcli dev wifi rescan
    sleep 1
    wifinet=$(nmcli -f BSSID,SSID,BARS,SECURITY dev wifi list | sed -n '1!p' | dmenu -i -l 10 -p "  Select a Wifi Network")
    bssid=$(echo "$wifinet" | cut -d' ' -f1)
    ssid=$(echo "$wifinet" | cut -d' ' -f3)
}

#####
## This function will store the WiFi password in the $pass variable
#####
password() {
    if nmcli connection show | grep -q "$ssid"; then # check if the network is already saved
        return 0 # no password is required
    elif nmcli -f BSSID,SECURITY dev wifi list | sed -n '1!p' | grep "$bssid" | awk '{print $2}' | grep -q -- "--"; then # check if the network is open
        return 0 # no password is required
    else
        pass=$(dmenu -i -l 1 -P -p "Enter Password " --password)
        if [ -n "$pass" ]; then # if the user gave a password
            return 0
        else
            exit 1 # if not, exit the script
        fi
    fi
}

#####
## This function will actually connect to the chosen WiFi network using the
## $bssid and $pass variables
#####
action() {
    if [ -n "$pass" ]; then # we need to check again if the $pass variable exists
        nmcli dev wifi connect "$bssid" password "$pass"
    else # if not, that means that the password() function ended in one of the first two conditions, the network is saved or open
        nmcli dev wifi connect "$bssid"
    fi
}

##########
## main ##
##########
cases=$(echo -e "$options" | dmenu -l 6 -i -p "  Wifi Settings" ) # main menu prompt
case "$cases" in
    "$option1")
        turnon
        ;;
    "$option2")
        turnoff
        ;;
    "$option3")
        disconnect
        ;;
    "$option4")
        if connect; then # if the user chooses a network
            password # this function will exit the script if the user didn't put a password
            action
        else
            exit 1 # if not, exit the script
        fi
        ;;
    "$option5")
        "$BROWSER" http://networkcheck.kde.org
        ;;
    "$option6")
        exit 0
esac