/**
 * RecentActivityWidget - Shows last 5 significant operations
 * Displays AI task completions, publishing events, etc.
 */

import { Link } from 'react-router-dom';
import {
  GroupIcon,
  BoltIcon,
  FileTextIcon,
  FileIcon,
  PaperPlaneIcon,
  ListIcon,
  AlertIcon,
  CheckCircleIcon,
} from '../../icons';

export interface ActivityItem {
  id: string;
  type: 'clustering' | 'ideas' | 'content' | 'images' | 'published' | 'keywords' | 'error' | 'sync';
  title: string;
  description: string;
  timestamp: Date;
  href?: string;
  success?: boolean;
}

interface RecentActivityWidgetProps {
  activities: ActivityItem[];
  loading?: boolean;
}

/**
 * Activity config with solid colored backgrounds for visual distinction:
 * - clustering: purple/pink (matches Clusters module)
 * - ideas: warning/amber (matches Ideas module)
 * - content: brand/primary (blue) - matches Writer content module
 * - images: purple/pink (matches Images module)
 * - published: success/green (matches Published module)
 * - keywords: brand/primary (blue) - matches Keywords module
 * - error: error/red
 * - sync: success/green
 */
const activityConfig: Record<string, { icon: typeof GroupIcon; gradient: string }> = {
  clustering: { icon: GroupIcon, gradient: 'from-purple-500 to-purple-600' },
  ideas: { icon: BoltIcon, gradient: 'from-warning-500 to-warning-600' },
  content: { icon: FileTextIcon, gradient: 'from-brand-500 to-brand-600' },
  images: { icon: FileIcon, gradient: 'from-purple-500 to-purple-600' },
  published: { icon: PaperPlaneIcon, gradient: 'from-success-500 to-success-600' },
  keywords: { icon: ListIcon, gradient: 'from-brand-500 to-brand-600' },
  error: { icon: AlertIcon, gradient: 'from-error-500 to-error-600' },
  sync: { icon: CheckCircleIcon, gradient: 'from-success-500 to-success-600' },
};

// Default config for unknown activity types
const defaultActivityConfig = { icon: BoltIcon, gradient: 'from-gray-500 to-gray-600' };

function formatRelativeTime(date: Date): string {
  const now = new Date();
  const diffMs = now.getTime() - date.getTime();
  const diffMins = Math.floor(diffMs / 60000);
  const diffHours = Math.floor(diffMs / 3600000);
  const diffDays = Math.floor(diffMs / 86400000);

  if (diffMins < 1) return 'Just now';
  if (diffMins < 60) return `${diffMins}m ago`;
  if (diffHours < 24) return `${diffHours}h ago`;
  if (diffDays === 1) return 'Yesterday';
  if (diffDays < 7) return `${diffDays}d ago`;
  
  return date.toLocaleDateString();
}

export default function RecentActivityWidget({ activities, loading }: RecentActivityWidgetProps) {
  return (
    <div className="bg-white dark:bg-gray-900 rounded-xl border border-gray-200 dark:border-gray-800 p-5">
      {/* Header */}
      <h3 className="text-base font-semibold text-gray-800 dark:text-gray-200 uppercase tracking-wide mb-4">
        Recent Activity
      </h3>

      {/* Activity List */}
      <div className="space-y-3">
        {loading ? (
          // Loading skeleton
          Array.from({ length: 5 }).map((_, i) => (
            <div key={i} className="flex items-start gap-3 animate-pulse">
              <div className="w-9 h-9 rounded-lg bg-gray-100 dark:bg-gray-800"></div>
              <div className="flex-1">
                <div className="h-4 w-3/4 bg-gray-100 dark:bg-gray-800 rounded mb-2"></div>
                <div className="h-3 w-1/4 bg-gray-100 dark:bg-gray-800 rounded"></div>
              </div>
            </div>
          ))
        ) : activities.length === 0 ? (
          <div className="text-center py-8">
            <p className="text-base text-gray-600 dark:text-gray-400">No recent activity</p>
            <p className="text-sm text-gray-500 dark:text-gray-500 mt-1">
              AI operations will appear here
            </p>
          </div>
        ) : (
          activities.slice(0, 5).map((activity) => {
            const config = activityConfig[activity.type] || defaultActivityConfig;
            const Icon = config.icon;
            
            const content = (
              <div className="flex items-start gap-3">
                <div className={`w-9 h-9 rounded-lg bg-gradient-to-br ${config.gradient} flex items-center justify-center flex-shrink-0 shadow-md`}>
                  <Icon className="w-5 h-5 text-white" />
                </div>
                <div className="flex-1 min-w-0">
                  <p className="text-base text-gray-800 dark:text-gray-200 line-clamp-1">
                    {activity.title}
                  </p>
                  <p className="text-sm text-gray-600 dark:text-gray-400">
                    {formatRelativeTime(activity.timestamp)}
                  </p>
                </div>
              </div>
            );

            return activity.href ? (
              <Link
                key={activity.id}
                to={activity.href}
                className="block hover:bg-gray-50 dark:hover:bg-gray-800/50 rounded-lg p-1 -m-1 transition-colors"
              >
                {content}
              </Link>
            ) : (
              <div key={activity.id} className="p-1 -m-1">
                {content}
              </div>
            );
          })
        )}
      </div>

      {/* View All Link */}
      {activities.length > 0 && (
        <Link
          to="/account/activity"
          className="block mt-3 pt-3 border-t border-gray-100 dark:border-gray-800 text-xs font-medium text-brand-600 hover:text-brand-700 dark:text-brand-400 dark:hover:text-brand-300 text-center"
        >
          View All Activity →
        </Link>
      )}
    </div>
  );
}