/**
 * NotificationItem Component
 * Single notification display with actions
 */

import React from 'react';

interface Notification {
  id: string;
  type: string;
  title: string;
  message: string;
  actionUrl?: string;
  read: boolean;
  createdAt: string;
}

interface NotificationItemProps {
  notification: Notification;
  onMarkAsRead: (id: string) => void;
  onDelete: (id: string) => void;
  compact?: boolean;
}

const typeIcons: Record<string, { icon: string; bgColor: string }> = {
  welcome: { icon: '👋', bgColor: 'bg-blue-100' },
  plant_registered: { icon: '🌱', bgColor: 'bg-green-100' },
  plant_reminder: { icon: '🌿', bgColor: 'bg-green-100' },
  transport_alert: { icon: '🚚', bgColor: 'bg-yellow-100' },
  farm_alert: { icon: '🏭', bgColor: 'bg-orange-100' },
  harvest_ready: { icon: '🎉', bgColor: 'bg-green-100' },
  demand_match: { icon: '🤝', bgColor: 'bg-purple-100' },
  weekly_digest: { icon: '📊', bgColor: 'bg-blue-100' },
  system_alert: { icon: '⚙️', bgColor: 'bg-gray-100' }
};

export function NotificationItem({
  notification,
  onMarkAsRead,
  onDelete,
  compact = false
}: NotificationItemProps) {
  const { icon, bgColor } = typeIcons[notification.type] || typeIcons.system_alert;

  function formatTimeAgo(dateString: string): string {
    const date = new Date(dateString);
    const now = new Date();
    const seconds = Math.floor((now.getTime() - date.getTime()) / 1000);

    if (seconds < 60) return 'Just now';
    if (seconds < 3600) return `${Math.floor(seconds / 60)}m ago`;
    if (seconds < 86400) return `${Math.floor(seconds / 3600)}h ago`;
    if (seconds < 604800) return `${Math.floor(seconds / 86400)}d ago`;

    return date.toLocaleDateString();
  }

  function handleClick() {
    if (!notification.read) {
      onMarkAsRead(notification.id);
    }
    if (notification.actionUrl) {
      window.location.href = notification.actionUrl;
    }
  }

  return (
    <div
      className={`relative group ${compact ? 'p-3' : 'p-4'} hover:bg-gray-50 transition-colors ${
        !notification.read ? 'bg-green-50/30' : ''
      }`}
    >
      <div
        className="flex items-start cursor-pointer"
        onClick={handleClick}
        role="button"
        tabIndex={0}
        onKeyPress={e => e.key === 'Enter' && handleClick()}
      >
        {/* Icon */}
        <div
          className={`flex-shrink-0 ${compact ? 'w-8 h-8' : 'w-10 h-10'} ${bgColor} rounded-full flex items-center justify-center`}
        >
          <span className={compact ? 'text-sm' : 'text-lg'}>{icon}</span>
        </div>

        {/* Content */}
        <div className={`flex-1 ${compact ? 'ml-3' : 'ml-4'}`}>
          <div className="flex items-start justify-between">
            <div className="flex-1">
              <p
                className={`font-medium text-gray-900 ${compact ? 'text-sm' : ''} ${
                  !notification.read ? 'font-semibold' : ''
                }`}
              >
                {notification.title}
              </p>
              <p className={`text-gray-600 mt-0.5 ${compact ? 'text-xs line-clamp-2' : 'text-sm'}`}>
                {notification.message}
              </p>
            </div>

            {/* Unread indicator */}
            {!notification.read && (
              <div className="flex-shrink-0 ml-2">
                <div className="w-2 h-2 bg-green-500 rounded-full"></div>
              </div>
            )}
          </div>

          <div className="flex items-center mt-2">
            <span className={`text-gray-400 ${compact ? 'text-xs' : 'text-xs'}`}>
              {formatTimeAgo(notification.createdAt)}
            </span>

            {notification.actionUrl && (
              <span className={`ml-2 text-green-600 ${compact ? 'text-xs' : 'text-xs'}`}>
                View details →
              </span>
            )}
          </div>
        </div>
      </div>

      {/* Actions (visible on hover) */}
      <div className="absolute right-4 top-1/2 -translate-y-1/2 opacity-0 group-hover:opacity-100 transition-opacity flex space-x-1">
        {!notification.read && (
          <button
            onClick={e => {
              e.stopPropagation();
              onMarkAsRead(notification.id);
            }}
            className="p-1.5 text-gray-400 hover:text-green-600 hover:bg-green-50 rounded"
            title="Mark as read"
          >
            <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
            </svg>
          </button>
        )}
        <button
          onClick={e => {
            e.stopPropagation();
            onDelete(notification.id);
          }}
          className="p-1.5 text-gray-400 hover:text-red-600 hover:bg-red-50 rounded"
          title="Delete"
        >
          <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
          </svg>
        </button>
      </div>
    </div>
  );
}