#!/bin/bash

#script to connect linux mint machine with Kenwood D75 radio. May possibly work with D74 but not tested.
#26FEB2024 KM4ACK
#27MARCH2024 last edit

#HELP

    #To create a menu shortcut, run : "d75-connect menu"

    #Before using this script, the D75 should be paired and trusted using the Bluetooth GUI app
    #found in Linux Mint.

    #KISS 12 TNC MUST be turned off for GPS. It must be turned ON for Winlink, packet, and APRS. (Function 5 on radio)
    #Bluetooth MUST be turned on on the radio. Also, GPS must be set to Bluetooth (Menu 981) and KISS must be set to 
    #Bluetooth (Menu 983). 

    #Start by scanning for your radio so the mac address can be recorded. By clicking the "Scan" button, hcitool scan
    #will be run in the background and look for the radio. The radio should be in "Pairing Mode" (menu item 934) before
    #starting the scan. It takes ~20 seconds for the scan to complete and display the results. If the scan does not 
    #see the radio, verify that Bluetooth is on and "Pairing Mode" is enabled on the radio and try again. A few 
    #times I have seen it take four or five scans to find the radio.

    #Next, start either Winlink, GPS, or YAAC.

    #Winlink requires that Pat Winlink and ax25 are both installed. D75-Connect will create the connection to the radio, 
    #start ax25, and open the Pat mailbox in a browser window.

    #YAAC connection require that YAAC is installed. When connecting YAAC with the radio, the script creates a new port 
    #(/dev/rfcomm0). YAAC will open with a custom blank "D-75" profile which can be tailored to the D75 without messing 
    #with other YAAC configurations that may be present on your machine. D75-Connect assumes that YAAC is installed at
    #$HOME/YAAC/YAAC.jar. If you used Build a Pi or 73Linux for the install, this should be the path. However, the
    #YAAC path can be modified in the yaac function found below. Before using YAAC with the script, be sure that 
    #KISS 12 is diplayed on the radio. This can be enabled with function 5 on the radio.
    
    #GPS requires that the gpsd package be installed on your system. Before attempting to stream the GPS data over
    #Bluetooth, be sure that both the APRS modem & KISS 12 are not enabled. (Function 5 on the radio)

    #Before closing the D75-Connect App, you should choose "Kill Connection" which will release rfcomm, stop 
    #kissattach, and close YAAC and remove rfcomm from gpsd if configured. You should also use the "Kill Connection"
    #when changing between Winlink, GPS, and YAAC connections.

    #D75-Connect is NOT compatible with Wayland

    #TROUBLESHOOTING
    #After you have chosen a connection method, the Bluetooth icon on the radio should be blue. If it remains grey,
    #it did not connect successfully. If the icon isn't blue after 10 seconds or so, kill the connection and try again.
    #Only packet Winlink sessions will work with the TNC in the Kenwood D75. VARA FM WILL NOT work.
#END HELP

version=2
#version 2 added menu shortcut creation
mydir="$(cd "$(dirname "$0")" && pwd)"
LOGO=/usr/share/icons/Adwaita/32x32/devices/phone-old-symbolic.symbolic.png
pat_port=$(grep http_addr /home/$USER/.config/pat/config.json | awk -F ":" '{print $3}' | sed 's/",//')
mac_file=${mydir}/.d75-connect.mac_addr
mac=$(cat ${mac_file})

splash(){
    yad --width=200 --height=200 --title="D75 Connect" --timeout=2 --image ${LOGO} --text-align=center --skip-taskbar --image-on-top \
    --wrap --no-buttons --center --window-icon=${LOGO} --undecorated --text="<big><b>\r\r\r\rD75 Connect\rversion ${version}</b></big>\rKM4ACK"

}

check_pw(){
#get sudo pw
    if [ ! -f /run/user/$UID/.d75 ]; then
        PW=$(yad --title="sudo password" --width=400 --height=100 \
        --image $LOGO --window-icon=$LOGO --image-on-top --text-align=center \
        --center --form --text="Please enter your sudo password" \
        --field="Password":H \
        --button=gtk-ok)
        PASS=$(echo $PW | awk -F "|" '{print $1}')
        echo $PASS | base64 > /run/user/$UID/.d75
        echo '#!/bin/bash' > /run/user/$UID/.d75pw
        echo 'PASS=$(base64 -d /run/user/$UID/.d75)' >> /run/user/$UID/.d75pw
        echo 'echo $PASS' >> /run/user/$UID/.d75pw
        chmod +x /run/user/$UID/.d75pw
        export SUDO_ASKPASS=/run/user/$UID/.d75pw
        #reset sudo timer to prevent false positive
        sudo -k
        echo "Checking SUDO credentials....standby"
        sudo -A touch /run/user/$UID/sutest 2>&1 </dev/null

            if [ $? = 1 ]; then
            yad --title="Wrong Password" --width=400 --height=100 \
            --image $LOGO --window-icon=$LOGO --image-on-top --text-align=center \
            --center --form --text="Wrong Password. Can't continue'" \
            --button="Exit"
            rm /run/user/$UID/.d75 /run/user/$UID/.d75pw
            exit
            else 
            echo "Credentials check out....continuing"
            fi
    else
        export SUDO_ASKPASS=/run/user/$UID/.d75pw
    fi
}

shortcut(){
    cat <<EOF>/run/user/$UID/d75-connect.desktop
[Desktop Entry]
Name=D75 Connect
GenericName=D75-Connect
Comment=Helper app for connecting D75 to Linux Mint
Exec=$HOME/bin/d75-connect
Icon=/usr/share/icons/Adwaita/32x32/devices/phone-old-symbolic.symbolic.png
Terminal=false
Type=Application
Categories=HamRadio;
EOF
sudo -A mv /run/user/$UID/d75-connect.desktop /usr/local/share/applications/
}


MAIN(){
    #MAIN MENU
    MENU=$(yad --image $LOGO --window-icon=$LOGO --form --width=400 --text="<b>D75 Connect v${version}</b>\rMAC = ${mac}" --text-align=center --center --title="D75 Connect" \
    --button="Winlink":2 \
    --button="YAAC":5 \
    --button="GPS":3 \
    --button="Kill Connection":4 \
    --button="Scan":6 \
    --button=Quit:1 )
    BUT=$?

    case $BUT in
        1) quit ;;
        2) pair_winlink ;;
        3) pair_gps ;;
        4) kill_connection ;;
        5) yaac ;;
        6) scan ;;
        252) quit ;;
    esac
}

check(){
    #function verifies we have a mac address to work with
    if [ -z ${mac} ]; then
        yad --title="D75 Connect" --width=400 --height=100 \
        --image $LOGO --window-icon=$LOGO --window-icon=$LOGO --image-on-top --text-align=center \
        --center --form --text="\r\r\r\rNo Device Defined\rRun Scan Before Connecting" \
        --button=gtk-ok
        if [ $? = 252 ]; then
            exit
        fi
        MAIN
    fi
}

scan(){
    #function scans for device and records mac address chosen.
    yad --title="D75 Connect" --width=400 --height=100 \
    --image $LOGO --window-icon=$LOGO --window-icon=$LOGO --image-on-top --text-align=center \
    --center --form --text="\r\r\r\rPut radio in Pairing mode before clicking ok\r<b>Menu 934</b>" \
    --button=gtk-ok
    if [ $? = 252 ]; then
        MAIN
    fi
    file=/run/user/$UID/hci-scan.tmp
    #give user some feedback
    yad --center --timeout=10 --timeout-indicator=top --no-buttons --height=100 --width=300 \
    --title="Scanning" --image $LOGO --window-icon=$LOGO --image-on-top \
    --text="Scanning for device. This takes about 20 seconds to complete. Devices will appear after scan is complete." &
    hcitool scan > ${file}
    mac=$(tail -n +2 ${file} | yad --title="D75 Connect" --list --column=Devices --image $LOGO \
    --window-icon=$LOGO --height=200 --width=300 --center --text="Select your device" \
    --button=gtk-ok)
    #echo $?; exit
    #check if "x" was pressed
    if [ $? = 252 ]; then
        exit;
    fi
        mac=$(echo $mac | awk '{print $1}')
        echo ${mac} | tee ${mac_file}
        MAIN
}

yaac(){
    #function pairs with radio and starts YAAC with d75 profile
    check
    sudo -A rfcomm bind /dev/rfcomm0 ${mac} 2
    sleep 1
    java -jar $HOME/YAAC/YAAC.jar -profile d75 &
    sleep 2
    yaac_pid=$(ps aux | grep -i yaac.jar| awk '{print $2}' | tail -2 | head -1)
    MAIN
}

quit(){
    #function checks for active connection before exit
    if [[ -n `ls /dev/ | grep rfcomm` ]]; then
        yad --title="D75 Connect" --width=400 --height=100 \
            --image $LOGO --window-icon=$LOGO --image-on-top --text-align=center \
            --center --form --text="\r\r\r\rConnection Active!\rKill connection before exit?" \
            --button=Kill:1 \
            --button=Exit:2
        if [ $? = 1 ]; then
            kill_connection
        else
            echo "73, QRT"; exit
        fi
    else
        echo "73, QRT"; exit
    fi
}

pair_winlink(){
    #function pairs with radio and starts Pat Winlink
    check
    yad --title="D75 Connect" --width=400 --height=100 \
        --image $LOGO --window-icon=$LOGO --image-on-top --text-align=center \
        --center --form --text="\r\r\r\rBe sure Bluetooth and TNC is enabled\rThen press ok" \
        --button=gtk-ok
    sudo -A rfcomm bind /dev/rfcomm0 ${mac} 2
    sudo -A kissattach /dev/rfcomm0 wl2k
    sudo -A kissparms -c 1 -p wl2k
    export DISPLAY=:0 && xdg-open http://127.0.0.1:$pat_port > /dev/null 2>&1 &
    MAIN
}

pair_gps(){
    #function pairs with radio and updates /etc/default/gpsd file for GPS over rfcomm0
    check
    yad --title="D75 Connect" --width=400 --height=100 \
        --image $LOGO --window-icon=$LOGO --image-on-top --text-align=center \
        --center --form --text="\r\r\r\rBe sure Bluetooth is enabled and the TNC is <b>disabled</b>\rThen press ok" \
        --button=gtk-ok
    sudo -A rfcomm bind /dev/rfcomm0 ${mac} 2

    cp /etc/default/gpsd /run/user/$UID

    sed -i "s|DEVICES=.*|DEVICES=\"/dev/rfcomm0\"|" /run/user/$UID/gpsd

    sudo -A cp /run/user/$UID/gpsd /etc/default/

    sudo -A systemctl restart gpsd

    yad --center --height="300" --width="300" --form --separator="|" --item-separator="|" --title="GPS" \
    --image $LOGO --window-icon=$LOGO --image-on-top \
    --text="\r\r\r\r\r<b><big>GPS had been updated</big></b>" \
    --button="OK":1
    MAIN
}

kill_connection(){
    #function kills existing connection(s)
    kill ${yaac_pid}
    sudo -A killall kissattach
    sudo -A rfcomm release all
    #next lines are needed to clear rfcomm from gpsd config file so that the GPS
    #will not try to take over when we enable a TNC connection
    if [[ -n `grep rfcomm /etc/default/gpsd` ]]; then
        sed -i "s|DEVICES=.*|DEVICES=\"/dev/\"|" /run/user/$UID/gpsd
        sudo -A cp /run/user/$UID/gpsd /etc/default/
        sudo -A systemctl restart gpsd
    fi
    MAIN
}

check_pw    #check for sudo pw
if [ "$1" = 'menu' ]; then
    shortcut
    echo "menu shortcut created"; exit
fi
splash      #show splash screen
check       #check for mac address
MAIN        #call main menu