#!/bin/bash

# blob:summary=Apply a monitor layout at runtime without touching monitors.lua
# blob:args=<list|apply <keyword>...|reset>
# blob:examples=blob display arrange apply 'DP-1,1920x1080@60,0x0,1'

set -e

action="${1-}"
shift || true

usage() {
  cat <<USAGE
Usage: blob-display-arrange <command>

  list                 print the current layout as monitor keywords
  apply <keyword>...   apply one or more monitor keywords now
  reset                reload the Hyprland config, restoring monitors.lua

A keyword is Hyprland's own monitor form:

  <name>,<mode>,<x>x<y>,<scale>[,transform,<n>][,mirror,<name>]
  <name>,disable

Changes made with apply are runtime only. They last until the config is
reloaded or the session ends; monitors.lua is never written.
USAGE
}

case "$action" in
list)
  hyprctl monitors all -j | jq -r '
    .[]
    | if .disabled then "\(.name),disable"
      else
        "\(.name),\(.width)x\(.height)@\((.refreshRate * 100 | round) / 100),\(.x)x\(.y),\(.scale)"
        + (if .transform != 0 then ",transform,\(.transform)" else "" end)
        + (if .mirrorOf != "none" then ",mirror,\(.mirrorOf)" else "" end)
      end
  '
  ;;
apply)
  if (( $# == 0 )); then
    echo "apply needs at least one monitor keyword" >&2
    exit 1
  fi
  for keyword in "$@"; do
    if [[ $keyword != *,* ]]; then
      echo "Not a monitor keyword: $keyword" >&2
      exit 1
    fi
    hyprctl keyword monitor "$keyword" >/dev/null
    echo "applied $keyword"
  done
  ;;
reset)
  hyprctl reload >/dev/null
  echo "reloaded; monitors.lua is authoritative again"
  ;;
""|--help|-h)
  usage
  ;;
*)
  echo "Unknown command: $action" >&2
  usage >&2
  exit 1
  ;;
esac