#!/usr/bin/env bash
set -euo pipefail

# Estimate how many "columns" fit on the focused monitor:
# max_visible_cols ≈ floor(1 / column_width)
# Then compare with number of windows in the active workspace on that monitor.
#
# Notes:
# - This is an approximation (hyprscrolling can have edge cases), but works well in practice.
# - If you use different column_width per monitor, you can extend this by detecting monitor + mapping widths.

COLUMN_WIDTH="${COLUMN_WIDTH:-0.5}"  # match your hyprscrolling config
ICON="${ICON:-󰓒}"                   # pick any nerd-font icon you like

active_ws="$(hyprctl -j activeworkspace | jq -r '.id')"
focused_mon="$(hyprctl -j monitors | jq -r '.[] | select(.focused==true) | .name')"

# Count windows on the active workspace (and on the focused monitor).
# (Many people keep workspaces per-monitor; this keeps the widget “per your current screen”.)
win_count="$(hyprctl -j clients \
  | jq --argjson ws "$active_ws" --arg mon "$focused_mon" '
      [ .[]
        | select(.workspace.id == $ws)
        | select(.monitor == $mon)
        | select(.mapped == true)
      ] | length
    ')"

# floor(1 / COLUMN_WIDTH) using awk (portable)
max_visible="$(awk -v w="$COLUMN_WIDTH" 'BEGIN{ if (w<=0) {print 1} else {print int(1.0/w)} }')"
if [ "$max_visible" -lt 1 ]; then max_visible=1; fi

overflow=$(( win_count - max_visible ))

if [ "$overflow" -gt 0 ]; then
  # Waybar expects JSON for custom modules
  printf '{"text":"%s +%d","tooltip":"%d windows on this workspace, approx %d fit on-screen (column_width=%s)","class":"overflow"}\n' \
    "$ICON" "$overflow" "$win_count" "$max_visible" "$COLUMN_WIDTH"
else
  # empty output hides it if you use "return-type: json" + "format": "{}"
  printf '{"text":"","tooltip":"%d windows, approx %d fit on-screen","class":"ok"}\n' \
    "$win_count" "$max_visible"
fi