#!/bin/bash

# menu similar to the super + p menu on windows
# used to quickly change settings when docking a laptop

mainmenu() {
    echo '>>h PROJECT
           Extend
           PC screen only
           Second screen only
               Duplicate
:g Set default action
:r Close menu' | instantmenu -l 20 -h -1 -c -w -1 -bw 4 -q search
}

defaultmenu() {
    echo '>>h Default projection settings
             Extend
             PC screen only
             Second screen only
                Duplicate
:b Ask
:r None
:b Back' | instantmenu -l 20 -h -1 -c -w -1 -bw 4 -q search
}

restartdunst() {
    sleep 1
    if pgrep dunst
    then
        echo "restarting dunst"
        pkill dunst
        sleep 1
        dunst & 
    fi
}

setdefault() {
    DEFAULTLOOPING="true"
    while [ -n "$DEFAULTLOOPING" ]; do
        DEFAULTCHOICE="$(defaultmenu)"

        if [ -z "$DEFAULTCHOICE" ]; then
            continue
        else
            unset DEFAULTLOOPING
        fi

        case "$DEFAULTCHOICE" in
        "*Second screen only")
            iconf automon S
            ;;
        *Extend)
            iconf automon e
            ;;
        "*PC screen only")
            iconf automon s
            ;;
        *Duplicate)
            iconf automon c
            ;;
        *None)
            iconf automon n
            ;;
        *Ask)
            iconf -d automon
            ;;
        *) # Back
            instantdisper &
            exit
            ;;
        esac
    done
}

# apply saved setting
applydefault() {
    if ! iconf automon; then
        echo "no default monitor setting"
    fi

    AUTOMON="$(iconf automon)"
    if grep '^[esSc]$' <<<"$AUTOMON"; then
        disper -"$AUTOMON"
        restartdunst &
    else
        echo "none"
    fi
}

if [ -n "$1" ]; then
    case "$1" in
    apply)
        if iconf automon; then
            applydefault
            exit
        fi
        ;;
    setdefault)
        setdefault
        applydefault
        exit
        ;;
    settings)
        echo "starting instantdisper"
        ;;
    esac
fi

LOOPING="true"
while [ -n "$LOOPING" ]; do
    CHOICE="$(mainmenu)"
    unset LOOPING
    case "$CHOICE" in
    *Extend)
        echo "extend"
        disper -e
        restartdunst &
        ;;
    *only)
        if grep -q 'PC' <<<"$CHOICE"; then
            echo "setting display to primary monitor"
            disper -s
        else
            echo "setting display to secondary monitor"
            disper -S
        fi
        restartdunst &
        ;;
    *Duplicate)
        echo "duplicating monitors"
        disper -c
        restartdunst &
        ;;
    *action)
        echo "setting default action"
        setdefault
        applydefault
        ;;
    *menu)
        exit
        ;;
    *)
        echo "choice $CHOICE"
        LOOPING="true"
        ;;
    esac
done