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

COLUMN_WIDTH="${COLUMN_WIDTH:-0.5}"
ICON="${ICON:-󰓒}"

fail_json() {
  printf '{"text":"%s !","tooltip":"hyprscroll-overflow: %s","class":"error"}\n' \
    "$ICON" "${1//\"/\\\"}"
  exit 0
}

command -v hyprctl >/dev/null 2>&1 || fail_json "hyprctl not in PATH"
command -v jq     >/dev/null 2>&1 || fail_json "jq not in PATH"

read -r focused_mon_id focused_ws_id < <(
  hyprctl -j monitors 2>/dev/null | jq -r '
    .[] | select(.focused==true) | "\(.id) \(.activeWorkspace.id)"
  '
) || fail_json "failed to read monitors"

[[ -n "${focused_mon_id:-}" && -n "${focused_ws_id:-}" ]] || fail_json "no focused monitor?"

win_count="$(
  hyprctl -j clients 2>/dev/null | jq --argjson ws "$focused_ws_id" --argjson mid "$focused_mon_id" '
    [ .[]
      | select(.mapped == true)
      | select(.workspace.id == $ws)
      | select(.monitor == $mid)
    ] | length
  '
)" || fail_json "failed to count clients"

max_visible="$(awk -v w="$COLUMN_WIDTH" 'BEGIN{ if (w<=0) {print 1} else {print int(1.0/w)} }')" \
  || fail_json "awk failed"
(( max_visible < 1 )) && max_visible=1

overflow=$(( win_count - max_visible ))

layout="$(hyprctl getoption general:layout 2>/dev/null | awk '/str:/ {print $2; exit}')"
[[ -n "${layout:-}" ]] || layout=""

if (( overflow > 0 )) && [[ "$layout" == "scrolling" ]]; then
  printf '{"text":"%s +%d","tooltip":"%d windows; approx %d fit (column_width=%s)","class":"overflow"}\n' \
    "$ICON" "$overflow" "$win_count" "$max_visible" "$COLUMN_WIDTH"
else
  # truly empty (and tooltip empty) + class for CSS
  printf '{"text":"","tooltip":"","class":"hidden"}\n'
fi