#!/usr/bin/env bash
# ==================================================
#  KoolDots (2026)
#  Project URL: https://github.com/LinuxBeginnings
#  License: GNU GPLv3
#  SPDX-License-Identifier: GPL-3.0-or-later
# ==================================================
# Toggle or incrementally adjust active window opacity with desktop notifications.
# Supports cycling preset levels (100% -> 85% -> 70% -> 50% -> 100%),
# stepping up/down (--inc / --dec), or setting explicit values.
# Uses flock to prevent double-execution from dual-config (.conf + .lua) loading.

set -uo pipefail

LOCK="/tmp/.hypr_toggle_opacity_${HYPRLAND_INSTANCE_SIGNATURE:-default}.lock"
STEP=0.05
MIN_OPACITY=0.20
MAX_OPACITY=1.00

config_home="${XDG_CONFIG_HOME:-$HOME/.config}"
hypr_dir="$config_home/hypr"
lua_entry="$hypr_dir/hyprland.lua"
legacy_lua_entry="$config_home/hyprland.lua"

if [[ -f "$lua_entry" || -f "$legacy_lua_entry" ]]; then
    hypr_config_mode="lua"
else
    hypr_config_mode="conf"
fi

icons_dir="$config_home/swaync/icons"
images_dir="$config_home/swaync/images"

if [[ -f "$icons_dir/palette.png" ]]; then
    ICON="$icons_dir/palette.png"
elif [[ -f "$icons_dir/dropper.png" ]]; then
    ICON="$icons_dir/dropper.png"
elif [[ -f "$images_dir/note.png" ]]; then
    ICON="$images_dir/note.png"
else
    ICON="$images_dir/ja.png"
fi

(
  flock -n 200 || exit 0

  # Get active window info
  ACTIVE_JSON=$(hyprctl activewindow -j 2>/dev/null || true)
  ACTIVE_CLASS=""
  if [[ -n "$ACTIVE_JSON" ]]; then
    ACTIVE_CLASS=$(echo "$ACTIVE_JSON" | jq -r '.class // empty' 2>/dev/null || true)
  fi

  CURRENT_PROP=$(hyprctl getprop active opacity 2>/dev/null || true)
  CURRENT_OPAQUE=$(hyprctl getprop active opaque 2>/dev/null || true)

  CURRENT_VAL=""
  if [[ -n "$CURRENT_PROP" && "$CURRENT_PROP" != *"not found"* && "$CURRENT_PROP" != *"unknown"* ]]; then
    CURRENT_VAL=$(echo "$CURRENT_PROP" | awk '{v = $1; if (v ~ /^[0-9.]+$/) print v;}')
  fi

  if [[ -z "$CURRENT_VAL" ]]; then
    CURRENT_VAL=$(hyprctl -j getoption decoration:active_opacity 2>/dev/null | jq -r '.float // empty')
  fi
  if [[ -z "$CURRENT_VAL" || "$CURRENT_VAL" == "null" ]]; then
    CURRENT_VAL=$(hyprctl getoption decoration:active_opacity 2>/dev/null | awk 'NR==1{print $2}')
  fi

  # Fallback to 1.0 if detection was empty
  CURRENT_NUM=$(awk -v c="${CURRENT_VAL:-1.0}" 'BEGIN { v = c + 0; if (v <= 0 || v > 1.0) v = 1.0; printf "%.2f", v }')

  # If window is explicitly opaque property true, consider it 1.0
  if [[ "${CURRENT_OPAQUE:-false}" == "true" ]]; then
    CURRENT_NUM="1.00"
  fi

  ACTION="${1:---toggle}"

  case "$ACTION" in
    --inc|+|-inc|inc|up|--up)
      TARGET_NUM=$(awk -v c="$CURRENT_NUM" -v s="$STEP" -v max="$MAX_OPACITY" 'BEGIN {
        v = c + s;
        if (v > max) v = max;
        printf "%.2f", v;
      }')
      ;;
    --dec|-|-dec|dec|down|--down)
      TARGET_NUM=$(awk -v c="$CURRENT_NUM" -v s="$STEP" -v min="$MIN_OPACITY" 'BEGIN {
        v = c - s;
        if (v < min) v = min;
        printf "%.2f", v;
      }')
      ;;
    --toggle|toggle|"")
      # Cycle through predefined incremental levels: 1.00 -> 0.85 -> 0.70 -> 0.50 -> 1.00
      TARGET_NUM=$(awk -v c="$CURRENT_NUM" 'BEGIN {
        if (c >= 0.98)      printf "0.85";
        else if (c >= 0.80) printf "0.70";
        else if (c >= 0.65) printf "0.50";
        else                printf "1.00";
      }')
      ;;
    *)
      # Parse explicit number / percentage, e.g. 0.85 or 85 or 85%
      RAW_ARG="${ACTION#--}"
      RAW_ARG="${RAW_ARG%\%}"
      TARGET_NUM=$(awk -v a="$RAW_ARG" -v min="$MIN_OPACITY" -v max="$MAX_OPACITY" 'BEGIN {
        v = a + 0;
        if (v > 1.0) v = v / 100.0;
        if (v > max) v = max;
        if (v < min) v = min;
        printf "%.2f", v;
      }')
      ;;
  esac

  TARGET_PROP="${TARGET_NUM} ${TARGET_NUM}"
  PERCENT=$(awk -v v="$TARGET_NUM" 'BEGIN { printf "%d", (v * 100) + 0.5 }')

  if [ "$PERCENT" -ge 99 ]; then
    OPAQUE_ACTION="true"
    DISPLAY_MSG="100% (Opaque)"
  else
    OPAQUE_ACTION="false"
    DISPLAY_MSG="${PERCENT}%"
  fi

  if [[ "$hypr_config_mode" == "lua" ]]; then
    # Set window-level property so it affects the active window even when windowrules are active
    hyprctl eval "return hl.dispatch(hl.dsp.window.set_prop({ prop = 'opacity', value = '${TARGET_PROP}' }))" >/dev/null 2>&1 || true
    hyprctl eval "return hl.dispatch(hl.dsp.window.set_prop({ prop = 'opaque', value = '${OPAQUE_ACTION}' }))" >/dev/null 2>&1 || true
    # Also update global active_opacity config
    hyprctl eval "hl.config({ decoration = { active_opacity = ${TARGET_NUM} } })" >/dev/null 2>&1 || true
  else
    hyprctl dispatch setprop active opacity "$TARGET_PROP" >/dev/null 2>&1 || true
    hyprctl dispatch setprop active opaque "$OPAQUE_ACTION" >/dev/null 2>&1 || true
    hyprctl keyword decoration:active_opacity "$TARGET_NUM" >/dev/null 2>&1 || true
  fi

  # Send notification
  if command -v notify-send >/dev/null 2>&1 && [[ -n "${WAYLAND_DISPLAY:-}${DISPLAY:-}" ]]; then
    SUBTITLE="${ACTIVE_CLASS:-Active Window}"
    notify-send -e \
      -h string:x-canonical-private-synchronous:opacity_notif \
      -h int:value:"$PERCENT" \
      -u low \
      -i "$ICON" \
      " Opacity: ${DISPLAY_MSG}" " ${SUBTITLE}" 2>/dev/null || true
  fi
) 200>"$LOCK"