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

# hyprscrolling-per-monitor.sh
# Usage:
#   ./hyprscrolling-per-monitor.sh <MONITOR_NAME>
#
# Example:
#   ./hyprscrolling-per-monitor.sh DP-1
#
# This script reads the current resolution for the given monitor via hyprctl
# and sets hyprscrolling column width accordingly.

if [[ $# -lt 1 ]]; then
  echo "Usage: $0 <MONITOR_NAME>"
  exit 2
fi

MONITOR="$1"

# Map a resolution (WIDTHxHEIGHT) to a column width value for hyprscrolling.
# Tune these values to taste.
columnwidth_for_resolution() {
  local res="$1"
  case "$res" in
    # --- Ultra-wide / super-wide ---
    5120x1440) echo "0.22" ;;  # 49" 32:9
    3840x1080) echo "0.25" ;;  # 49" 32:9 (your ultrawide)
    3440x1440) echo "0.33" ;;  # 34" 21:9
    2560x1080) echo "0.40" ;;  # 21:9 budget ultrawide

    # --- QHD / high DPI ---
    3840x2160) echo "0.40" ;;  # 4K
    3200x1800) echo "0.50" ;;
    2880x1800) echo "0.50" ;;
    2560x1600) echo "0.55" ;;  # 16:10
    2560x1440) echo "0.55" ;;  # QHD

    # --- FHD / laptop-ish ---
    1920x1200) echo "0.55" ;;  # 16:10
    1920x1080) echo "0.50" ;;  # FHD (your laptop request)

    # --- HD / smaller ---
    1680x1050) echo "0.65" ;;
    1600x900)  echo "0.70" ;;
    1366x768)  echo "0.80" ;;
    1280x720)  echo "0.85" ;;

    # Unknown / fallback
    *) echo "" ;;
  esac
}

# Get resolution for a named monitor from hyprctl.
# Output format should be WIDTHxHEIGHT (e.g. 3840x1080).
get_monitor_resolution() {
  local mon="$1"

  # hyprctl monitors prints lines like:
  #   Monitor DP-1 (ID 0): 3840x1080@119.88 at 0x0 ...
  # We'll extract the first WIDTHxHEIGHT after the colon.
  local line
  if ! line="$(hyprctl monitors 2>/dev/null | grep -F "Monitor ${mon} " -m1 || true)"; then
    echo ""
    return 0
  fi

  # Extract token like 3840x1080@... then strip @...
  local token
  token="$(awk -F': ' '{print $2}' <<<"$line" | awk '{print $1}' | cut -d'@' -f1 || true)"
  echo "$token"
}

resolution="$(get_monitor_resolution "$MONITOR")"
if [[ -z "$resolution" ]]; then
  echo "Could not determine resolution for monitor '$MONITOR'."
  echo "Tip: check available names with: hyprctl monitors"
  exit 1
fi

colw="$(columnwidth_for_resolution "$resolution")"
if [[ -z "$colw" ]]; then
  echo "No mapping for resolution '$resolution' on monitor '$MONITOR'."
  echo "Add it to columnwidth_for_resolution() in this script."
  exit 1
fi

# Apply to hyprscrolling.
# Using layoutmsg colresize (as in your snippet).
hyprctl dispatch layoutmsg colresize all "$colw"

echo "hyprscrolling: set column width to $colw for monitor '$MONITOR' ($resolution)"