#!/usr/bin/env bash

hc() { "${herbstclient_command[@]:-herbstclient}" "$@" ; }
quote() { local q="$(printf '%q ' "$@")"; printf '%s' "${q% }" ; }
uniq_linebuffered() { awk '$0 != l { print ; l=$0 ; fflush(); }' "$@"; }

monitor=${1:-0}

hc attr "monitors.$monitor" > /dev/null || { printf "Invalid monitor $monitor" && exit 1 ; }

monitor_offset_x=$(hc monitor_rect "$monitor" | awk '{print $1 }')
monitor_offset_y=$(hc monitor_rect "$monitor" | awk '{print $2 }')
monitor_width=$(hc monitor_rect "$monitor" | awk '{ print $3 }')
monitor_height=$(hc monitor_rect "$monitor" | awk '{ print $4 }')
panel_height=21
panel_color_bg="$(hc get frame_border_normal_color)"
panel_color_fg="#efefef"
panel_color_focus="$(hc get frame_border_active_color)"
panel_font="Liberation Mono:size=9"
panel_offset_x=$(( monitor_offset_x ))
panel_offset_y=$(( monitor_offset_y + monitor_height - panel_height ))

{
	hc --idle
} 2> /dev/null | {
	while :
	do
		# Wait for an event
		IFS=$'\t' read -ra event || break

		# Declare clients as an array
		declare -a clients

		# Check which tag the monitor is on now
		monitor_tag="$(herbstclient attr "monitors.$monitor.tag")"

		# Collect all clients on the monitor
		for client in $(hc attr clients | grep '0x')
		do
			[[ "$(hc attr "clients.$client.tag")" != $monitor_tag ]] && continue

			clients+=("$client")
		done

		name_offset_interval=$(( monitor_width / ${#clients[@]} ))

		# Look up current focus window
		focus="$(hc attr clients.focus.winid)"

		# Loop through the clients to create a representation
		index=0

		for client in "${clients[@]}"
		do

			if [[ "$client" == "$focus." ]]
			then
				color_fg="$panel_color_focus"
			else
				color_fg="$panel_color_fg"
			fi

			name=" $(hc attr "clients.$client.title") "
			name_width=$(xftwidth "$panel_font" "$name")
			name_offset=$(( name_offset_interval * index ))

			printf "^pa(%s)^bg(%s)^fg(%s)^ca(1,%s)%s^ca()" \
				"$name_offset" \
				"$panel_color_bg" \
				"$color_fg" \
				"herbstclient jumpto '$client'" \
				"$name"

			index=$(( index + 1 ))
		done

		# Add a newline
		printf "\n"

		# Clean up some variables
		unset clients
		unset index
	done
} | dzen2 -w "$monitor_width" -x "$panel_offset_x" -y "$panel_offset_y" -fn "$panel_font" -h "$panel_height" \
	-e "button3=;button4=exec:$hc_quoted use_index -1;button5=exec:$hc_quoted use_index +1" \
	-ta l -bg "$panel_color_bg" -fg "$panel_color_fg"