import { useEffect, useRef } from 'react';
import { X, CheckCircle, AlertTriangle, AlertCircle, Info, Bell, Trash2 } from 'lucide-react';
import { useGameStore, type GameNotification } from '@/store';
import { formatDuration } from '@ai-tycoon/shared';

const ICON_MAP = {
  success: { icon: CheckCircle, color: 'text-success' },
  warning: { icon: AlertTriangle, color: 'text-warning' },
  danger: { icon: AlertCircle, color: 'text-danger' },
  info: { icon: Info, color: 'text-accent-light' },
} as const;

export function NotificationPanel({ onClose }: { onClose: () => void }) {
  const notifications = useGameStore((s) => s.notifications);
  const markAllRead = useGameStore((s) => s.markAllNotificationsRead);
  const removeNotification = useGameStore((s) => s.removeNotification);
  const clearAll = useGameStore((s) => s.clearAllNotifications);
  const currentTick = useGameStore((s) => s.meta.tickCount);
  const panelRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    markAllRead();
  }, [markAllRead]);

  useEffect(() => {
    const handler = (e: MouseEvent) => {
      if (panelRef.current && !panelRef.current.contains(e.target as Node)) {
        onClose();
      }
    };
    const keyHandler = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    document.addEventListener('mousedown', handler);
    document.addEventListener('keydown', keyHandler);
    return () => {
      document.removeEventListener('mousedown', handler);
      document.removeEventListener('keydown', keyHandler);
    };
  }, [onClose]);

  return (
    <div
      ref={panelRef}
      className="absolute top-12 right-0 w-80 max-h-96 bg-surface-900 border border-surface-700 rounded-xl shadow-2xl z-50 overflow-hidden flex flex-col"
    >
      <div className="px-4 py-3 border-b border-surface-700 flex items-center justify-between shrink-0">
        <h3 className="text-sm font-semibold">Notifications</h3>
        <div className="flex items-center gap-2">
          {notifications.length > 0 && (
            <button onClick={clearAll} className="text-surface-500 hover:text-surface-300 text-[10px]" title="Clear all">
              <Trash2 size={12} />
            </button>
          )}
          <button onClick={onClose} className="text-surface-400 hover:text-surface-200">
            <X size={14} />
          </button>
        </div>
      </div>
      <div className="overflow-y-auto flex-1">
        {notifications.length === 0 ? (
          <div className="p-6 text-center text-surface-500">
            <Bell size={24} className="mx-auto mb-2 opacity-50" />
            <p className="text-sm">No notifications yet</p>
          </div>
        ) : (
          notifications.map((n: GameNotification) => {
            const { icon: Icon, color } = ICON_MAP[n.type] ?? ICON_MAP.info;
            const ticksAgo = currentTick - n.tick;
            return (
              <div key={n.id} className="px-4 py-3 border-b border-surface-800 last:border-0 hover:bg-surface-800/50 group">
                <div className="flex items-start gap-2">
                  <Icon size={14} className={`${color} mt-0.5 shrink-0`} />
                  <div className="flex-1 min-w-0">
                    <div className="text-sm font-medium">{n.title}</div>
                    <div className="text-xs text-surface-400">{n.message}</div>
                    <div className="text-xs text-surface-600 mt-1">{formatDuration(ticksAgo)} ago</div>
                  </div>
                  <button onClick={() => removeNotification(n.id)} className="text-surface-600 hover:text-surface-300 opacity-0 group-hover:opacity-100 transition-opacity shrink-0 mt-0.5">
                    <X size={12} />
                  </button>
                </div>
              </div>
            );
          })
        )}
      </div>
    </div>
  );
}