#!/bin/bash

# Get the active monitor (the one with the cursor)
MONITOR_INFO=$(hyprctl monitors -j | jq -r '.[] | select(.focused == true)')
ACTIVE_MONITOR=$(echo "$MONITOR_INFO" | jq -r '.name')
CURRENT_SCALE=$(echo "$MONITOR_INFO" | jq -r '.scale')
WIDTH=$(echo "$MONITOR_INFO" | jq -r '.width')
HEIGHT=$(echo "$MONITOR_INFO" | jq -r '.height')
REFRESH_RATE=$(echo "$MONITOR_INFO" | jq -r '.refreshRate')

# Cycle through scales: 1 → 1.25 → 1.6 → 2 → 3 → 1 (or reverse with --reverse)
SCALES=(1 1.25 1.6 2 3)

# Find the index of the scale closest to the current one (Hyprland may
# snap fractional scales to nearby values, so we can't match exactly)
CURRENT_IDX=$(awk -v s="$CURRENT_SCALE" -v list="${SCALES[*]}" 'BEGIN {
  n = split(list, arr, " ")
  best = 0; best_diff = 1e9
  for (i = 1; i <= n; i++) {
    d = s - arr[i]; if (d < 0) d = -d
    if (d < best_diff) { best_diff = d; best = i - 1 }
  }
  print best
}')

if [[ "$1" == "--reverse" ]]; then
  NEW_IDX=$(( (CURRENT_IDX - 1 + ${#SCALES[@]}) % ${#SCALES[@]} ))
else
  NEW_IDX=$(( (CURRENT_IDX + 1) % ${#SCALES[@]} ))
fi

NEW_SCALE=${SCALES[$NEW_IDX]}

hyprctl keyword monitor "$ACTIVE_MONITOR,${WIDTH}x${HEIGHT}@${REFRESH_RATE},auto,$NEW_SCALE"
notify-send -u low "󰍹    Display scaling set to ${NEW_SCALE}x"