#!/usr/bin/env bash
#
# Hotspots for Xorg
# - Corners: BL, BR, TL, TR
# - Edges: B, T, L, R
# - Events: onEnter, onExit
#
# Dependencies: xdotool
#
# TODO:
# - better multimonitor support

# hotspot size
SIZE=2

# active hotspot dimensions (width, height)
B=(1100 140)
T=(700 "$SIZE")
L=(460 700)
R=(140 700)
BL=(400 400)
BR=("$SIZE" "$SIZE")
TL=(400 300)
TR=("$SIZE" "$SIZE")

## event handlers
#function cycleDesktops {
#    # by resetting $ZONE the onEnter event will fire
#    # repeatedly and no onExit event will be given
#    ZONE=""
#    ~/.scripts/show-desktop next
#    sleep 0.3
#}

function onEnter {
    ZONE=$1
    case "$1" in
    #'B') eww open status &>/dev/null ;;
        #'L') eww open panel &>/dev/null ;;
    'R') eww open bar &>/dev/null ;;
        #'BL') launch-rofi ;;
        #'TR') cycleDesktops ;;
    esac
}

function onExit {
    ZONE=''
    case "$1" in
    #'B') eww close status &>/dev/null ;;
        #'L') eww close panel &>/dev/null ;;
    'R') eww close bar &>/dev/null ;;
        #'TR') cycleDesktops ;;
    esac
}

# get screen dimensions (returns: WIDTH, HEIGHT)
eval "$(xdotool getdisplaygeometry --shell)"

# calculate coordinates
BLY=$((HEIGHT - BL[1]))
BRX=$((WIDTH - BR[0]))
BRY=$((HEIGHT - BR[1]))
TRX=$((WIDTH - TR[0]))
BX1=$(((WIDTH - B[0]) / 2))
BX2=$(((WIDTH + B[0]) / 2))
BY=$((HEIGHT - B[1]))
LY1=$(((HEIGHT - L[1]) / 2))
LY2=$(((HEIGHT + L[1]) / 2))
RX=$((WIDTH - R[0]))
RY1=$(((HEIGHT - R[1]) / 2))
RY2=$(((HEIGHT + R[1]) / 2))
H=$((HEIGHT - SIZE))
W=$((WIDTH - SIZE))

# watch mouse
while :; do
    sleep 0.1

    # get mouse location (returns: X, Y)
    eval "$(xdotool getmouselocation --shell)"

    if [ "$ZONE" = "" ]; then
        if [[ "$Y" -ge "$H" ]]; then
            if [[ "$X" -lt "$SIZE" ]]; then
                onEnter BL
            elif [[ "$X" -gt "$BX1" && "$X" -lt "$BX2" ]]; then
                onEnter B
            elif [[ "$X" -gt "$W" ]]; then
                onEnter BR
            fi
        elif [[ "$Y" -lt "$SIZE" ]]; then
            if [[ "$X" -lt "$SIZE" ]]; then
                onEnter TL
            elif [[ "$X" -gt "$BX1" && "$X" -lt "$BX2" ]]; then
                onEnter T
            elif [[ "$X" -gt "$W" ]]; then
                onEnter TR
            fi
        elif [[ "$X" -lt "$SIZE" && "$Y" -gt "$LY1" && "$Y" -lt "$LY2" ]]; then
            onEnter L
        elif [[ "$X" -gt "$W" && "$Y" -gt "$RY1" && "$Y" -lt "$RY2" ]]; then
            onEnter R
        fi
    else
        case "$ZONE" in
        'B') [[ "$X" -lt "$BX1" || "$X" -gt "$BX2" || "$Y" -lt "$BY" ]] &&
            onExit B ;;
        'L') [[ "$X" -ge "${L[0]}" || "$Y" -lt "$LY1" || "$Y" -gt "$LY2" ]] &&
            onExit L ;;
        'R') [[ "$X" -le "$RX" || "$Y" -lt "$RY1" || "$Y" -gt "$RY2" ]] &&
            onExit R ;;
        'T') [[ "$X" -lt "$BX1" || "$X" -gt "$BX2" || "$Y" -gt "${T[1]}" ]] &&
            onExit T ;;
        'BL') [[ "$X" -ge "${BL[0]}" || "$Y" -lt "$BLY" ]] &&
            onExit BL ;;
        'BR') [[ "$X" -le "$BRX" || "$Y" -lt "$BRY" ]] &&
            onExit BR ;;
        'TL') [[ "$X" -ge "${TL[0]}" || "$Y" -ge "${TL[1]}" ]] &&
            onExit TL ;;
        'TR') [[ "$X" -le "$TRX" || "$Y" -ge "${TR[1]}" ]] &&
            onExit TR ;;
        esac
    fi
done