#!/usr/bin/env bash
# Rotate the CURRENTLY FOCUSED monitor in 90° steps: 0→90→180→270→0…
set -euo pipefail

notify() {
  if command -v notify-send >/dev/null 2>&1; then
    notify-send -a "Hyprland" "$1" "${2:-}"
  else
    [ -n "${2:-}" ] && printf '%s: %s\n' "$1" "$2" >&2 || printf '%s\n' "$1" >&2
  fi
}

# Read monitors
MON_JSON="$(hyprctl -j monitors 2>/dev/null || true)"
if [ -z "$MON_JSON" ]; then
  notify "Hyprland error" "Couldn’t read monitors via hyprctl."
  exit 1
fi

# Focused monitor info
if command -v jq >/dev/null 2>&1; then
  NAME="$(printf '%s' "$MON_JSON" | jq -r '.[] | select(.focused==true) | .name' | head -n1)"
  DESC="$(printf '%s' "$MON_JSON" | jq -r '.[] | select(.focused==true) | .description' | head -n1)"
  TFORM="$(printf '%s' "$MON_JSON" | jq -r '.[] | select(.focused==true) | (.transform // 0)' | head -n1)"
else
  NAME=""; DESC=""; TFORM=""; FOC=0; GOT=0
  while IFS= read -r line || [ -n "$line" ]; do
    if [[ $line =~ ^Monitor[[:space:]]+([^[:space:]]+)[[:space:]]+\(ID[[:space:]] ]]; then
      if (( FOC==1 )); then GOT=1; break; fi
      NAME="${BASH_REMATCH[1]}"; DESC=""; TFORM=""; FOC=0
    elif [[ $line =~ ^[[:space:]]*description:[[:space:]]*(.*)$ ]]; then
      DESC="${BASH_REMATCH[1]}"
    elif [[ $line =~ ^[[:space:]]*transform:[[:space:]]*([0-9]+)$ ]]; then
      TFORM="${BASHREMATCH[1]}"
    elif [[ $line =~ ^[[:space:]]*focused:[[:space:]]*yes$ ]]; then
      FOC=1
    elif [[ -z $line ]]; then
      if (( FOC==1 )); then GOT=1; break; fi
    fi
  done < <(hyprctl monitors 2>/dev/null)
  if (( GOT==0 && FOC==1 )); then GOT=1; fi
  if (( GOT==0 )); then NAME=""; fi
  : "${TFORM:=0}"
fi

if [ -z "${NAME:-}" ] || [ "${NAME:-null}" = "null" ]; then
  notify "No active monitor to rotate" "Couldn’t determine a focused monitor."
  exit 1
fi

# Use description if available (most specific), else connector name
if [ -n "${DESC:-}" ] && [ "${DESC:-null}" != "null" ]; then
  IDENT="desc:${DESC}"
else
  IDENT="${NAME}"   # bare connector name; no "name:" prefix
fi

# Base monitor string
BASE="${IDENT}, highres@highrr, auto-right, 1"

# Compute next transform in 90° steps (ignore flipped bit if present)
if ! [[ "${TFORM:-}" =~ ^[0-9]+$ ]]; then TFORM=0; fi
BASE_ROT=$(( TFORM % 4 ))
NEXT=$(( (BASE_ROT + 1) % 4 ))
DEG=$(( NEXT * 90 ))

run_hyprctl() {
  if ! OUT="$(hyprctl keyword monitor "$1" 2>&1)"; then
    notify "hyprctl failed" "$OUT"
    exit 1
  fi
}

run_hyprctl "$BASE, transform, $NEXT"
notify "Rotation applied" "${DESC:-$NAME} → ${DEG}° (transform $NEXT)"