#!/bin/sh
# umbriel-float-square
# Floating focused window: square, as tall as the usable height (below
# Noctalia's bar) minus PAD px above and below, centered on its output.
# Tiled: center its column (the old Mod+C). Extents are fractions of the
# usable area, so both sides are computed from the output's usable size.
set -eu

PAD=4

window=$(umbriel windows --json | jq -c '[.[] | select(.active)][0] // empty')
[ -n "$window" ] || exit 0

if [ "$(printf '%s' "$window" | jq -r .floating)" != true ]; then
    exec umbriel msg column-center
fi

id=$(printf '%s' "$window" | jq -r .id)
output=$(printf '%s' "$window" | jq -r .output)
extents=$(umbriel outputs --json | jq -r --arg o "$output" --argjson pad "$PAD" '
    def frac: . * 10000 | floor / 10000;
    .[] | select(.name == $o) | .usable_area
    | (.height - 2 * $pad) as $side
    | "\($side) \([$side / .width, 1] | min | frac) \($side / .height | frac)"')
set -- $extents
side=$1

umbriel msg "window-set-secondary-extent:$3"
umbriel msg "window-set-primary-extent:$2"

# window-center uses the size the client has committed; centering before the
# resize lands centers the old width. Wait up to 1 s for the new width.
i=0
while [ $i -lt 20 ]; do
    w=$(umbriel windows --json | jq -r --arg id "$id" '.[] | select(.id == $id) | .w')
    [ $((w - side)) -ge -1 ] && [ $((w - side)) -le 1 ] && break
    sleep 0.05
    i=$((i + 1))
done
exec umbriel msg window-center