#!/usr/bin/env bash

MUTDROP_PATH=/tmp/tdrop_"$USER"
# shellcheck disable=SC2174
mkdir -p "$MUTDROP_PATH" -m 700

print_help() {
	echo "
usage: tdrop [options] <program> or 'current' or
                       one of 'auto_show'/'auto_hide'/'toggle_auto_hide'
options:
	-h height	specify a height for a newly created term (default: 45%)
	-w width	specify a width for a newly created term (default: 100%)
	-x pos		specify x offset for a newly created term (default: 0)
	-y pos		specify y offset for a newly created term (default: 1, see man)
	-s name		name for tmux/tmuxinator/tmuxifier session (supported
			terminal required)
	-n num		num or extra text; only needed if for the purpose of using
			multiple dropdowns of same program
	-c cmd		provide a pre-create command
	-C cmd		provide a post-create command
	-l cmd		provide a command to float the window before it is mapped
	-L cmd		provide a command to float the window after it is mapped
	-p cmd		provide a pre-map command
	-P cmd		provide a post-map command
	-u cmd		provide a pre-unmap command
	-U cmd		provide a post-unmap command
	-d XxY		give decoration/border size to accurately restore window
			position; only applicable with auto_show
	-S cmd		can be used to fix saved geometry with auto_hide; see manpage
	-i cmd		provide a command to detect whether the current window is a
			floating window; on applicable with auto_hide
	-f flags	specify flags/options to be used when creating the term or
			window (e.g. -f '--title mytitle'; default: none).
			Caution: if there is a tmux session specified (with -s), the option
			to execute a program (usually -e for terminal programs) is
			implicitly added by tdrop
	-a		automatically detect window manager and set relevant options
			(e.g. this makes specifying -l/-L, -d, and -i uneccessary
			for supported WMs) (default: false)
	-m		for use with multiple monitors and only with dropdowns
			(i.e. not for auto_show or auto_hide); convert percentages used
			for width or height to values relative to the size of the
			current monitor and force resizing of the dropdown when
			the monitor changes (default: false)
	--wm		set the window manager name to mimic another window manager
			(for use with -a)
	--class name	manually specify the class of the window (can be obtained with xprop)
	--name name	set a new name for the dropdown window
	--clear		clear saved window id; useful after accidentally make a
			window a dropdown (e.g. '$ tdrop --clear current')
	--no-cancel	don't cancel auto-showing (default is to prevent this when
			manually toggling a window after it is auto-hidden)
	--help		print help

See man page for more details.
"
	if [[ $1 == illegal_opt ]]; then
		exit 1
	else
		exit 0
	fi
}

# * Default Options and Option Parsing
# xdotool can take percentages; cannot take decimal percentages though
width="100%"
height="45%"
xoff=0
yoff=2
session_name=
num=
pre_create=
post_create=
pre_float=
post_float=
pre_map=
post_map=
pre_unmap=
post_unmap=
dec_fix=
# NOTE:
# pekwm, xfwm4, sawfish, openbox need subtract_when_same to be true
# for awesome, fluxbox, blackbox, mutter, fvwm, and metacity, the value
# does not matter
# set in decoration_settings
subtract_when_same=
is_floating=
program_flags=
clearwid=false
cancel_auto_show=true
auto_detect_wm=false
monitor_aware=false
wm=
user_set_wm=false
class=
name=
while getopts :h:w:x:y:s:n:c:C:l:L:p:P:u:U:d:f:-:am opt
do
	case $opt in
	h) height=$OPTARG;;
	w) width=$OPTARG;;
	x) xoff=$OPTARG;;
	y) yoff=$OPTARG;;
	s) session_name=$OPTARG;;
	n) num=$OPTARG;;
	c) pre_create=$OPTARG;;
	C) post_create=$OPTARG;;
	l) pre_float=$OPTARG;;
	L) post_float=$OPTARG;;
	p) pre_map=$OPTARG;;
	P) post_map=$OPTARG;;
	u) pre_unmap=$OPTARG;;
	U) post_unmap=$OPTARG;;
	d) dec_fix=$OPTARG;;
	S) subtract_when_same=false;;
	i) is_floating=$OPTARG;;
	f) program_flags=$OPTARG;;
	a) auto_detect_wm=true;;
	m) monitor_aware=true;;
	-)
		if [[ $OPTARG =~ ^(auto-detect-wm|monitor-aware|clear|no-cancel|help)$ ]] || \
			[[ $OPTARG == *=* ]]; then
			OPTION=${OPTARG%%=*}
			OPTARG=${OPTARG#*=}
		else
			OPTION=$OPTARG
			# shellcheck disable=SC2124
			OPTARG=${@:$OPTIND:1}
			((OPTIND++))
		fi
		case $OPTION in
		height) height=$OPTARG;;
		width) width=$OPTARG;;
		x-offset) xoff=$OPTARG;;
		y-offset) yoff=$OPTARG;;
		session) session_name=$OPTARG;;
		number) num=$OPTARG;;
		pre-create-hook) pre_create=$OPTARG;;
		post-create-hook) post_create=$OPTARG;;
		pre-map-float-command) pre_float=$OPTARG;;
		post-map-float-command) post_float=$OPTARG;;
		pre-map-hook) pre_map=$OPTARG;;
		post-map-hook) post_map=$OPTARG;;
		pre-unmap-hook) pre_unmap=$OPTARG;;
		post-unmap-hook) post_unmap=$OPTARG;;
		decoration-fix) dec_fix=$OPTARG;;
		no-subtract-when-same) subtract_when_same=false;;
		is-floating) is_floating=$OPTARG;;
		program-flags) program_flags=$OPTARG;;
		auto-detect-wm) auto_detect_wm=true;;
		monitor-aware) monitor_aware=true;;
		wm) wm=$OPTARG
			user_set_wm=true;;
		class) class=$OPTARG;;
		name) name=$OPTARG;;
		clear) clearwid=true;;
		no-cancel) cancel_auto_show=false;;
		help) print_help;;
		*) print_help illegal_opt;;
		esac;;
	*) print_help illegal_opt;;
	esac
done
shift "$((OPTIND-1))"
program=$1

# check that the program is not a path and does not contain flags
if [[ ! $program =~ ^(current|auto_hide|auto_show|toggle_auto_hide)$ ]] && \
	   ! type "$program" 2> /dev/null; then
	echo >&2 "The program should be in PATH and not contain flags." | \
		tee -a "$MUTDROP_PATH"/log
	exit 1
fi

if [[ $# -ne 1 ]]; then
	echo >&2 "Exactly 1 positional argument is required." \
		"For help use -h or --help or see the manpage." | \
		tee -a "$MUTDROP_PATH"/log
	exit 1
fi

# validate options that require number values
if [[ ! $height$width$xoff$yoff =~ ^[0-9%-]*$ ]]; then
	echo >&2 "The -h, -w, -x, and -y values must be numbers (or percentages)." | \
		tee -a "$MUTDROP_PATH"/log
	exit 1
fi
if [[ -n $dec_fix ]] && [[ ! $dec_fix =~ ^-?[0-9]+x-?[0-9]+$ ]]; then
	echo >&2 "The decoration fix value must have form 'num'x'num'." \
		"The numbers can be negative or zero." | tee -a "$MUTDROP_PATH"/log
	exit 1
fi

# non-user-settable global vars
wid=
# used for -m option; at first tdrop assumes that there is a focused window
# on the current desktop; if there isn't (and the WM doesn't have some way to
# query the current monitor), this will be set to false, and tdrop will have to
# find out the current monitor info after opening the dropdown
# (currently, using xwininfo to find the position of a window is the only
# WM-independent way I know to find out what the current monitor is)
focused_window_exists=true

# * Multiple Monitor Automatic Re-Sizing
percent_of_total() { # percent total
	awk "BEGIN {printf(\"%.0f\", 0.01*${1%\%}*$2)}"
}

# acts on globals
convert_geometry_to_pixels() {
	total_width=$1
	total_height=$2
	local minus_width minus_height minus_xoff minus_yoff
	if [[ $width =~ %$ ]]; then
		width=$(percent_of_total "$width" "$total_width")
	elif [[ $width =~ ^- ]]; then
		minus_width=${width#-}
		width=$((total_width-minus_width))
	fi
	if [[ $height =~ %$ ]]; then
		height=$(percent_of_total "$height" "$total_height")
	elif [[ $height =~ ^- ]]; then
		minus_height=${height#-}
		height=$((total_height-minus_height))
	fi
	if [[ $xoff =~ %$ ]]; then
		xoff=$(percent_of_total "$xoff" "$total_width")
	elif [[ $xoff =~ ^- ]]; then
		minus_xoff=${xoff#-}
		xoff=$((total_width-minus_xoff))
	fi
	if [[ $yoff =~ %$ ]]; then
		yoff=$(percent_of_total "$yoff" "$total_height")
	elif [[ $yoff =~ ^- ]]; then
		minus_yoff=${yoff#-}
		yoff=$((total_height-minus_yoff))
	fi
}

update_geometry_settings_for_monitor() {
	# 1. Correctly interpret width/height percentages when there exist multiple
	#    monitors so an initially created dropdown is the correct size (xdotool
	#    would create a dropdown the width of all screens for 100% width)
	# 2. Force resize the dropdown to the correct percentage of the current
	#    monitor IF the monitor has changed since the last time the dropdown
	#    was used

	# it is conceivable that a user may want to use -m but not -a, so
	# get the wm from within this function
	local wm current_monitor
	wm=$(get_window_manager)
	if [[ $wm == bspwm ]]; then
		current_monitor=$(bspc query -T -m | grep -Po '^{"name":.*?",' | \
			awk -F ":" '{gsub("[\",]", ""); print $2}')
	elif [[ $wm == i3 ]]; then
		# I'd rather not make jq a dependency
		current_monitor=$(i3-msg -t get_workspaces | sed 's/{"num"/\n/g' | \
			awk -F ',' '/focused":true/ {sub(".*output",""); gsub("[:\"]",""); print $1}')
	fi

	local monitor_geo x_begin y_begin x_width y_height
	if [[ -n $current_monitor ]]; then
		monitor_geo=$(xrandr --query | \
			awk "/$current_monitor/ {gsub(\"primary \",\"\"); print \$3}")
		x_begin=$(echo "$monitor_geo" | awk -F '+' '{print $2}')
		y_begin=$(echo "$monitor_geo" | awk -F '+' '{print $3}')
		x_width=$(echo "$monitor_geo" | awk -F 'x' '{print $1}')
		y_height=$(echo "$monitor_geo" | awk -F 'x|+' '{print $2}')
	else
		local wid wininfo window_x window_y monitors_info x_end y_end
		# determine current monitor in generic way
		wid=$(xdotool getactivewindow)
		if [[ -z $wid ]]; then
			# will try again after remapping or creating the dropdown
			return 1
		fi
		wininfo=$(xwininfo -id "$wid")
		window_x=$(echo "$wininfo" | awk '/Absolute.*X/ {print $4}')
		window_y=$(echo "$wininfo" | awk '/Absolute.*Y/ {print $4}')
		monitors_info=$(xrandr --query | awk '/ connected/ {gsub("primary ",""); print}')
		while read -r monitor; do
			monitor_geo=$(echo "$monitor" | awk '{print $3}')
			if [[ $monitor_geo =~ ^[0-9]+x[0-9]+\+[0-9]+\+[0-9]+$ ]]; then
				x_begin=$(echo "$monitor_geo" | awk -F '+' '{print $2}')
				y_begin=$(echo "$monitor_geo" | awk -F '+' '{print $3}')
				x_width=$(echo "$monitor_geo" | awk -F 'x' '{print $1}')
				y_height=$(echo "$monitor_geo" | awk -F 'x|+' '{print $2}')
				x_end=$((x_begin+x_width))
				y_end=$((y_begin+y_height))
				if [[ $window_x -ge $x_begin ]] && [[ $window_x -lt $x_end ]] && \
					[[ $window_y -ge $y_begin ]] && [[ $window_y -lt $y_end ]]; then
					current_monitor=$(echo "$monitor" | awk '{print $1}')
					break
				fi
			fi
		done <<< "$monitors_info"
	fi

	# convert w/h/x/y percentages/negatives to pixels
	convert_geometry_to_pixels "$x_width" "$y_height"

	# update x and y offsets, so that will appear on correct screen
	# (required for some WMs apparently, but not for others)
	((xoff+=x_begin))
	((yoff+=y_begin))
}

map_and_reset_geometry() {
	xdotool windowmap "$wid" windowmove "$wid" "$xoff" "$yoff" \
		windowsize "$wid" "$width" "$height" 2> /dev/null
}

# * WM Detection and Hooks
get_window_manager() {
	# xfwm4 and fvwm at least will give two names (hence piping into head)
	xprop -notype -id "$(xprop -root -notype | \
		awk '$1=="_NET_SUPPORTING_WM_CHECK:"{print $5}')" \
		-f _NET_WM_NAME 8u | awk -F "\"" '/WM_NAME/ {print $2}' | head -n 1
}

set_wm() {
	if ! $user_set_wm && $auto_detect_wm; then
		wm=$(get_window_manager)
	fi
}

decoration_settings() {
	if [[ -z $subtract_when_same ]]; then
		if $auto_detect_wm \
				&& [[ $wm =~ ^(Mutter|GNOME Shell|bspwm|i3|GoomwW)$ ]]; then
			subtract_when_same=false
		else
			subtract_when_same=true
		fi
	fi

	if [[ -z "$dec_fix" ]] && $auto_detect_wm; then
		# settings for stacking/floating wms where can't get right position
		# easily from xwininfo; take borders into account
		if [[ $wm == Blackbox ]]; then
			dec_fix="1x22"
		elif [[ $wm =~ ^(Mutter|GNOME Shell)$ ]]; then
			dec_fix="-10x-8"
		elif [[ $wm =~ ^(Mutter \(Muffin\))$ ]]; then
			dec_fix="-9x-8"
		fi
	fi
}

set_class() {
	if [[ -z "$class" ]]; then
		if [[ $program =~ ^google-chrome ]]; then
			class=google-chrome
		elif [[ $program == st ]]; then
			class=st-256color
		elif [[ $program == gnome-terminal ]]; then
			class=Gnome-terminal
		elif [[ $program == urxvtc ]]; then
			class=urxvt
		elif [[ $program == xiatec ]]; then
			class=xiate
		elif [[ $program == alacritty ]]; then
			class=Alacritty
		elif [[ $program == current ]]; then
			class=$(cat "$MUTDROP_PATH"/current"$num"_class  2> /dev/null)
		else
			class=$program
		fi
	fi
}

is_floating() {
	if [[ -n $is_floating ]]; then
		eval "$is_floating $1"
	elif $auto_detect_wm; then
		if [[ $wm == i3 ]]; then
			# TODO make sure this returns 1 on failure
			i3-msg -t get_tree | awk 'gsub(/{"id"/, "\n{\"id\"")' | \
				awk '/focused":true.*floating":"user_on/ {print $1}'
		elif [[ $wm == bspwm ]]; then
			bspc query -T -n | grep '"state":"floating"'
		else
			return 0
		fi
	else
		return 0
	fi
}

pre_float() {
	if [[ $wm == bspwm ]]; then
		# newest (using "instance" names)
		if [[ $class =~ [A-Z] ]]; then
			bspc rule -a "$class" -o state=floating
		else
			bspc rule -a \*:"$class" -o state=floating
		fi
	fi
}

post_float() {
	if [[ $wm == awesome ]]; then
		echo 'local awful = require("awful") ; awful.client.floating.set(c, true)' | \
			awesome-client
	elif [[ $wm == i3 ]]; then
		i3-msg "[id=$wid] floating enable" > /dev/null
	elif [[ $wm == herbstluftwm ]]; then
		herbstclient fullscreen on
	fi
}

pre_create() {
	if [[ -n $pre_create ]]; then
		eval "$pre_create"
	fi
}

post_create() {
	if [[ -n $post_create ]]; then
		eval "$post_create"
	fi
}

pre_map() {
	float=${1:-true}
	if [[ $float != false ]]; then
		if [[ -n $pre_float ]]; then
			eval "$pre_float"
		elif $auto_detect_wm; then
			pre_float
		fi
	fi
	if [[ -n $pre_map ]]; then
		eval "$pre_map"
	fi
}

map_and_post_map() {
	# always reset geometry
	map_and_reset_geometry
	float=${1:-true}
	if [[ $float != false ]]; then
		if [[ -n $post_float ]]; then
			eval "$post_float"
		elif $auto_detect_wm; then
			post_float
		fi
	fi
	# need to set geometry again if wasn't previously floating
	map_and_reset_geometry
	if [[ -n $post_map ]]; then
		eval "$post_map"
	fi
}

pre_unmap() {
	if [[ -n $pre_unmap ]]; then
		eval "$pre_unmap"
	fi
}

post_unmap() {
	if [[ -n $post_unmap ]]; then
		eval "$post_unmap"
	fi
}

unmap() {
	hide=$1
	pre_unmap
	xdotool windowunmap "$wid"
	if [[ -z $hide ]]; then
		if [[ $wm == herbstluftwm ]]; then
			# TODO should only happen if wasn't previously fullscreen
			herbstclient fullscreen off
		fi
	fi
	post_unmap
}

# Old notes:
# floating WMs that may move a window after remapping it
# pekwm|Fluxbox|Blackbox|xfwm4|Metacity|FVWM|Sawfish|GoomwW|Mutter|GNOME Shell|Mutter \(Muffin\)|KWin|Metacity \(Marco\)|[Cc]ompiz|bspwm
# floating WMs that may both move and resize a window after remapping it
# Openbox

# * General Helper Functions
get_class_name() {
	xprop -id "$1" WM_CLASS | awk '{gsub(/"/, ""); print $4}'
}

get_visibility() {
	xwininfo -id "$1" 2> /dev/null | awk '/Map State/ {print $3}'
}

maybe_cancel_auto_show() {
	if $cancel_auto_show && \
		[[ $1 == $(cat "$MUTDROP_PATH"/auto_hidden/wid 2> /dev/null) ]]; then
		# shellcheck disable=SC2188
		> "$MUTDROP_PATH"/auto_hidden/wid
	fi
}

# * Dropdown Initialization
create_win_return_wid() {
	local blacklist program_command pid visible_wid wids wid program_wid
	# blacklist all existing wids of program
	# (for programs where one pid shares all wids)
	blacklist=$(xdotool search --classname "$program")
	# for programs where $! won't always work (e.g. one pid for all windows)
	if [[ $program =~ ^(tilix|xfce4-terminal)$ ]]; then
		pid=$(pgrep -x "$program")
	elif [[ $program == urxvtc ]]; then
		blacklist=$(xdotool search --classname urxvtd)
		pid=$(pgrep -x urxvtd)
	elif [[ $program == xiatec ]]; then
		pid=$(pgrep -x xiate)
	elif [[ $program == chromium ]]; then
		# this may work fine
		# pid=$(pgrep -xo chromium)
		pid=$(pgrep -xa chromium | awk '!/--type/ {print $1}')
	elif [[ $program == chromium-browser ]]; then
		pid=$(pgrep -xa chromium-browse | awk '!/--type/ {print $1}')
	elif [[ $program =~ ^google-chrome ]]; then
		pid=$(pgrep -xa chrome | awk '!/--type/ {print $1}')
	fi
	# need to redirect stdout or function won't return
	eval "$1 > /dev/null &"
	if [[ -z $pid ]]; then
		# for normal programs
		# also for when one of the programs above hadn't already been started
		pid=$!
	fi
	visible_wid=false
	while : ; do
		if [[ $program == gnome-terminal ]]; then
			# only 1 pid; changes at some point after first run
			# actual process name for me is gnome-terminal-
			pid=$(pgrep gnome-terminal)
		fi
		wids=$(xdotool search --pid "$pid")
		if [[ -n "$wids" ]]; then
			while read -r wid; do
				if [[ ! $blacklist =~ (^|$'\n')"$wid"($|$'\n') ]] && \
					[[ $(get_visibility "$wid") == IsViewable ]]; then
					visible_wid=true
					program_wid=$wid
				fi
			done <<< "$wids"
		fi
		if $visible_wid; then
			break
		fi
		sleep 0.01
	done
	echo -n "$program_wid"
}

program_start() {
	local program_command tmux_command wid
	program_command="$program $program_flags"
	if [[ -n "$session_name" ]]; then
		session_name=$(printf "%q" "$session_name")
		tmux_command="'tmux attach-session -dt $session_name || \
			tmuxifier load-session $session_name || \
			tmuxinator start $session_name || \
			tmux new-session -s $session_name'"
		if [[ $program =~ ^(urxvt|alacritty|xiatec$) ]]; then
			program_command="$program_command -e bash -c $tmux_command"
		elif [[ $program == kitty ]]; then
			program_command="$program_command bash -c $tmux_command"
		else
			program_command="$program_command -e \"bash -c $tmux_command\""
		fi
	fi
	wid=$(create_win_return_wid "$program_command")
	if [[ -n "$name" ]]; then
		xdotool set_window --name "$name" "$wid"
	fi
	echo "$wid" > "$MUTDROP_PATH/$program$num"
	echo -n "$wid"
}

current_create() {
	# turns active window into a dropdown
	local wid
	wid=$(xdotool getactivewindow)
	echo "$wid" > "$MUTDROP_PATH"/current"$num"
	get_class_name "$wid" > "$MUTDROP_PATH"/current"$num"_class
	if [[ -n "$name" ]]; then
		xdotool set_window --name "$name" "$wid"
	fi
	echo -n "$wid"
}

wid_toggle() {
	# deal with percentages/negatives when no -m
	if ! $monitor_aware; then
		local total_geo total_width total_height
		total_geo=$(xwininfo -root | awk '/geometry/ {print $2}')
		total_width=$(echo "$total_geo" | awk -F 'x' '{print $1}')
		total_height=$(echo "$total_geo" | awk -F 'x|+' '{print $2}')
		convert_geometry_to_pixels "$total_width" "$total_height"
	fi
	# get saved window id if already created
	local exists visibility
	# cat to silence error
	wid=$(cat "$MUTDROP_PATH/$program$num" 2> /dev/null)
	exists=true
	if [[ -n $wid ]]; then
		visibility=$(get_visibility "$wid")
		# sometimes xwininfo will still report a window as existing hence xprop check
		if [[ -z $visibility ]] || [[ -z $(xprop -id "$wid" 2> /dev/null) ]]; then
			# window no longer exists
			exists=false
			# shellcheck disable=SC2188
			> "$MUTDROP_PATH/$program$num"
		fi
	else
		exists=false
	fi
	if $exists; then
		if [[ $visibility =~ ^(IsUnMapped|IsUnviewable)$ ]]; then
			# visibility will be IsUnMapped on most WMs if the dropdown is open
			# on another desktop; may also be IsUnviewable
			xdotool set_desktop_for_window "$wid" "$(xdotool get_desktop)"
			if [[ $(get_visibility "$wid") == IsUnMapped ]]; then
				pre_map
			else
				xdotool windowactivate "$wid"
			fi
			# update here if possible so this doesn't cause a delay
			# between the window being remapped and resized
			if $monitor_aware; then
				update_geometry_settings_for_monitor || \
					focused_window_exists=false
			fi
			map_and_post_map
			# cancel auto-show for a window when manually remapping it
			maybe_cancel_auto_show "$wid"
			if ! $focused_window_exists; then
				# need to use dropdown as active window to get monitor info
				update_geometry_settings_for_monitor
				# always resize/move; if monitor hasn't changed then it won't be
				# necessary, but it won't cause problems either
				map_and_reset_geometry
			fi
		else
			unmap
		fi
	else
		# necessary to deal with negative width or height
		# if creating on an empty desktop and can't determine the monitor,
		# must set temporary values for negative width and/or height
		local original_width original_height
		if $monitor_aware && ! update_geometry_settings_for_monitor; then
			focused_window_exists=false
			if [[ $width =~ ^- ]]; then
				original_width=$width
				width=100%
			fi
			if [[ $height =~ ^- ]]; then
				original_height=$height
				height=100%
			fi
		fi
		# make it
		pre_create
		if [[ $program == current ]]; then
			wid=$(current_create)
			unmap
		else
			pre_map
			wid=$(program_start)
			map_and_post_map
			# update window dimensions if necessary
			if ! $focused_window_exists; then
				width=${original_width:-$width}
				height=${original_height:-$height}
				update_geometry_settings_for_monitor
				map_and_reset_geometry
			fi
		fi
		post_create
	fi
}

# * Helper Functions for Auto Hiding/Showing
get_geometry() {
	# so that won't float a tiled window later when showing
	if is_floating "$1" &> /dev/null; then
		local wininfo x y rel_x rel_y width height
		wininfo=$(xwininfo -id "$1")
		x=$(echo "$wininfo" | awk '/Absolute.*X/ {print $4}')
		y=$(echo "$wininfo" | awk '/Absolute.*Y/ {print $4}')
		rel_x=$(echo "$wininfo" | awk '/Relative.*X/ {print $4}')
		rel_y=$(echo "$wininfo" | awk '/Relative.*Y/ {print $4}')
		if [[ $subtract_when_same != false ]]; then
			# behaviour works for most WMs (at least floating ones)
			x=$((x-rel_x))
			y=$((y-rel_y))
		else
			# don't subtract when abs and rel values are the same
			# necessary for WMs like bspwm and i3
			if [[ $x -ne $rel_x ]]; then
				x=$((x-rel_x))
			fi
			if [[ $y -ne $rel_y ]]; then
				y=$((y-rel_y))
			fi
		fi
		width=$(xwininfo -id "$(xdotool getactivewindow)" | \
					awk '/Width/ {print $2}')
		height=$(xwininfo -id "$(xdotool getactivewindow)" | \
					 awk '/Height/ {print $2}')
		echo -n -e "xoff=$x\nyoff=$y\nwidth=$width\nheight=$height"
	else
		# window is not floating; don't bother saving geometry
		echo -n "false"
	fi
}

# set global xoff, yoff, width, and height based on stored values
restore_geometry() {
	local x_fix y_fix
	eval "$(< "$MUTDROP_PATH"/auto_hidden/geometry)"
	if [[ -n $dec_fix ]]; then
		x_fix=$(echo "$dec_fix" | awk -F "x" '{print $1}')
		y_fix=$(echo "$dec_fix" | awk -F "x" '{print $2}')
		xoff=$((xoff-x_fix))
		yoff=$((yoff-y_fix))
	fi
}

toggle_auto_hide() {
	local no_hide
	no_hide=$(< "$MUTDROP_PATH"/auto_hidden/no_hide) 2> /dev/null
	mkdir -p "$MUTDROP_PATH"/auto_hidden
	if [[ -z $no_hide ]]; then
		echo "true" > "$MUTDROP_PATH"/auto_hidden/no_hide
	else
		# shellcheck disable=SC2188
		> "$MUTDROP_PATH"/auto_hidden/no_hide
	fi
}

# * Auto Hiding/Showing
auto_hide() {
	local no_hide
	no_hide=$(< "$MUTDROP_PATH"/auto_hidden/no_hide) 2> /dev/null
	if [[ -z $no_hide ]]; then
		wid=$(xdotool getactivewindow)
		mkdir -p "$MUTDROP_PATH"/auto_hidden
		echo "$wid" > "$MUTDROP_PATH"/auto_hidden/wid
		get_class_name "$wid" > "$MUTDROP_PATH"/auto_hidden/class
		get_geometry "$wid" > "$MUTDROP_PATH"/auto_hidden/geometry
		unmap hide
	fi
}

auto_show() {
	local no_hide
	no_hide=$(< "$MUTDROP_PATH"/auto_hidden/no_hide) 2> /dev/null
	if [[ -z $no_hide ]]; then
		local was_floating XY
		wid=$(< "$MUTDROP_PATH"/auto_hidden/wid)
		class=$(< "$MUTDROP_PATH"/auto_hidden/class)
		was_floating=$(< "$MUTDROP_PATH"/auto_hidden/geometry)
		restore_geometry "$wid"
		pre_map "$was_floating"
		map_and_post_map "$was_floating"
	fi
}

# * Main
# ** Setup
set_wm
decoration_settings
set_class

# ** Primary Action
if $clearwid; then
	# shellcheck disable=SC2188
	> "$MUTDROP_PATH/$program$num"
elif [[ $program == toggle_auto_hide ]]; then
	toggle_auto_hide
elif [[ $program == auto_hide ]]; then
	auto_hide
elif [[ $program == auto_show ]]; then
	auto_show
else
	wid_toggle
fi

# vim is dumb
# vim: set ft=sh noet: