import { useState, useEffect } from 'react';
import { useBaaS } from '@picobaas/client/react';
import type { ImageAnalytics, ViewLog, ShareLink } from '../types';
import { listShareLinks } from '../api/shareLinks';
import { getSessionToken } from '../utils/session';
import LoadingSpinner from './LoadingSpinner';

interface ImageInfo {
  imageUrl: string;
  shortUrl: string;
  path: string;
}

interface AnalyticsDashboardProps {
  shortCode: string;
  onClose?: () => void;
}

export default function AnalyticsDashboard({ shortCode, onClose }: AnalyticsDashboardProps) {
  const { client } = useBaaS();
  const [analytics, setAnalytics] = useState<ImageAnalytics | null>(null);
  const [imageInfo, setImageInfo] = useState<ImageInfo | null>(null);
  const [shareLinks, setShareLinks] = useState<ShareLink[]>([]);
  const [isLoading, setIsLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    fetchData();
  }, [shortCode]);

  const fetchData = async () => {
    setIsLoading(true);
    setError(null);

    try {
      const token = client.accessToken;
      const headers = {
        'Authorization': token ? `Bearer ${token}` : '',
      };

      // Fetch image info, analytics, and share links in parallel
      const sessionToken = getSessionToken();
      const [imageResponse, analyticsResponse, links] = await Promise.all([
        fetch(`/api/images/${shortCode}`, { headers }),
        fetch(`/api/images/${shortCode}/analytics`, { headers }),
        listShareLinks(shortCode, token || undefined, sessionToken),
      ]);

      // Handle image info
      if (imageResponse.ok) {
        const imgData = await imageResponse.json();
        setImageInfo({
          imageUrl: imgData.image_url,
          shortUrl: imgData.short_url || `/i/${shortCode}`,
          path: imgData.path,
        });
      }

      // Handle share links
      setShareLinks(links);

      // Handle analytics
      if (!analyticsResponse.ok) {
        const errorData = await analyticsResponse.json().catch(() => ({}));
        throw new Error(errorData.error || 'Failed to load analytics');
      }

      const data = await analyticsResponse.json();
      setAnalytics({
        totalViews: data.total_views,
        uniqueVisitors: data.unique_visitors,
        proxyViewsCount: data.proxy_views_count,
        viewsByReferrer: data.views_by_referrer || {},
        recentViews: (data.recent_views || []).map((v: Record<string, unknown>) => ({
          id: v.id as string,
          viewerIp: v.viewer_ip as string,
          userAgent: v.user_agent as string,
          referrer: v.referrer as string | null,
          country: v.country as string | null,
          isProxyDetected: v.is_proxy_detected as boolean,
          viewedAt: new Date(v.viewed_at as string),
        })),
      });
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load analytics');
    } finally {
      setIsLoading(false);
    }
  };

  if (isLoading) {
    return (
      <div className="flex items-center justify-center p-8">
        <LoadingSpinner size="lg" />
      </div>
    );
  }

  if (error) {
    return (
      <div className="p-6 text-center">
        <div className="text-red-600 dark:text-red-400 mb-4">{error}</div>
        <button onClick={fetchData} className="btn btn-secondary">
          Try Again
        </button>
      </div>
    );
  }

  if (!analytics) {
    return null;
  }

  return (
    <div className="space-y-6">
      {/* Header with image preview */}
      <div className="flex justify-between items-start gap-4">
        <div className="flex items-center gap-4">
          {imageInfo && (
            <a
              href={imageInfo.shortUrl}
              target="_blank"
              rel="noopener noreferrer"
              className="flex-shrink-0"
            >
              <img
                src={imageInfo.imageUrl}
                alt="Image preview"
                className="w-16 h-16 object-cover rounded-lg hover:opacity-80 transition-opacity"
              />
            </a>
          )}
          <div>
            <h2
              className="text-xl font-semibold"
              style={{ color: 'var(--text-primary)' }}
            >
              Image Analytics
            </h2>
            {imageInfo && (
              <p className="text-sm" style={{ color: 'var(--text-muted)' }}>
                {imageInfo.path.split('/').pop()}
              </p>
            )}
          </div>
        </div>
        {onClose && (
          <button
            onClick={onClose}
            className="transition-colors flex-shrink-0"
            style={{ color: 'var(--text-muted)' }}
          >
            <svg className="h-6 w-6" fill="none" viewBox="0 0 24 24" stroke="currentColor">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
            </svg>
          </button>
        )}
      </div>

      {/* Stats Grid */}
      <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
        <div
          className="rounded-lg p-4"
          style={{ backgroundColor: 'var(--bg-tertiary)' }}
        >
          <div className="text-sm mb-1" style={{ color: 'var(--text-muted)' }}>
            Total Views
          </div>
          <div
            className="text-2xl font-bold"
            style={{ color: 'var(--text-primary)' }}
          >
            {analytics.totalViews}
          </div>
        </div>
        <div
          className="rounded-lg p-4"
          style={{ backgroundColor: 'var(--bg-tertiary)' }}
        >
          <div className="text-sm mb-1" style={{ color: 'var(--text-muted)' }}>
            Unique Visitors
          </div>
          <div
            className="text-2xl font-bold"
            style={{ color: 'var(--text-primary)' }}
          >
            {analytics.uniqueVisitors}
          </div>
        </div>
        <div
          className="rounded-lg p-4"
          style={{ backgroundColor: 'var(--bg-tertiary)' }}
        >
          <div className="text-sm mb-1" style={{ color: 'var(--text-muted)' }}>
            Proxy/VPN Views
          </div>
          <div
            className="text-2xl font-bold"
            style={{ color: 'var(--text-primary)' }}
          >
            {analytics.proxyViewsCount}
          </div>
        </div>
      </div>

      {/* Referrers */}
      {Object.keys(analytics.viewsByReferrer).length > 0 && (
        <div>
          <h3
            className="text-sm font-medium mb-3"
            style={{ color: 'var(--text-secondary)' }}
          >
            Top Referrers
          </h3>
          <div
            className="rounded-lg divide-y"
            style={{
              backgroundColor: 'var(--bg-tertiary)',
              borderColor: 'var(--border)',
            }}
          >
            {Object.entries(analytics.viewsByReferrer)
              .sort(([, a], [, b]) => b - a)
              .slice(0, 5)
              .map(([referrer, count]) => (
                <div
                  key={referrer}
                  className="px-4 py-3 flex justify-between items-center"
                  style={{ borderColor: 'var(--border)' }}
                >
                  <span
                    className="text-sm truncate max-w-xs"
                    style={{ color: 'var(--text-secondary)' }}
                    title={referrer}
                  >
                    {referrer}
                  </span>
                  <span
                    className="text-sm font-medium"
                    style={{ color: 'var(--text-primary)' }}
                  >
                    {count}
                  </span>
                </div>
              ))}
          </div>
        </div>
      )}

      {/* Share Links Section */}
      {shareLinks.length > 0 && (
        <div>
          <h3
            className="text-sm font-medium mb-3"
            style={{ color: 'var(--text-secondary)' }}
          >
            Share Links ({shareLinks.length})
          </h3>
          <div
            className="rounded-lg divide-y"
            style={{
              backgroundColor: 'var(--bg-tertiary)',
              borderColor: 'var(--border)',
            }}
          >
            {shareLinks
              .sort((a, b) => b.createdAt.getTime() - a.createdAt.getTime())
              .map((link) => (
                <div
                  key={link.id}
                  className="px-4 py-3"
                  style={{ borderColor: 'var(--border)' }}
                >
                  <div className="flex justify-between items-start mb-2">
                    <div className="flex items-center gap-2">
                      <code
                        className="text-sm font-mono px-2 py-0.5 rounded"
                        style={{ backgroundColor: 'var(--bg-secondary)' }}
                      >
                        {link.linkCode}
                      </code>
                      {link.isRevoked ? (
                        <span className="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-red-100 text-red-800 dark:bg-red-900/30 dark:text-red-400">
                          Revoked
                        </span>
                      ) : !link.isValid ? (
                        <span className="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-gray-100 text-gray-800 dark:bg-gray-700 dark:text-gray-400">
                          Expired
                        </span>
                      ) : (
                        <span className="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-green-100 text-green-800 dark:bg-green-900/30 dark:text-green-400">
                          Active
                        </span>
                      )}
                    </div>
                    <div
                      className="text-sm font-medium"
                      style={{ color: 'var(--text-primary)' }}
                    >
                      {link.viewCount} {link.viewCount === 1 ? 'view' : 'views'}
                    </div>
                  </div>
                  <div
                    className="text-xs flex flex-wrap gap-x-4 gap-y-1"
                    style={{ color: 'var(--text-muted)' }}
                  >
                    <span>Created: {formatDate(link.createdAt)}</span>
                    <span>
                      Expires: {formatDate(link.expiresAt)}
                    </span>
                    {link.lastViewedAt && (
                      <span>Last viewed: {formatDate(link.lastViewedAt)}</span>
                    )}
                  </div>
                </div>
              ))}
          </div>
        </div>
      )}

      {/* Recent Views Table */}
      <div>
        <h3
          className="text-sm font-medium mb-3"
          style={{ color: 'var(--text-secondary)' }}
        >
          Recent Views
        </h3>
        {analytics.recentViews.length === 0 ? (
          <p className="text-sm" style={{ color: 'var(--text-muted)' }}>
            No views recorded yet
          </p>
        ) : (
          <div className="overflow-x-auto">
            <table
              className="min-w-full divide-y"
              style={{ borderColor: 'var(--border)' }}
            >
              <thead style={{ backgroundColor: 'var(--bg-tertiary)' }}>
                <tr>
                  <th
                    className="px-4 py-3 text-left text-xs font-medium uppercase tracking-wider"
                    style={{ color: 'var(--text-muted)' }}
                  >
                    Time
                  </th>
                  <th
                    className="px-4 py-3 text-left text-xs font-medium uppercase tracking-wider"
                    style={{ color: 'var(--text-muted)' }}
                  >
                    IP Address
                  </th>
                  <th
                    className="px-4 py-3 text-left text-xs font-medium uppercase tracking-wider"
                    style={{ color: 'var(--text-muted)' }}
                  >
                    Referrer
                  </th>
                  <th
                    className="px-4 py-3 text-left text-xs font-medium uppercase tracking-wider"
                    style={{ color: 'var(--text-muted)' }}
                  >
                    Proxy
                  </th>
                </tr>
              </thead>
              <tbody
                className="divide-y"
                style={{
                  backgroundColor: 'var(--bg-secondary)',
                  borderColor: 'var(--border)',
                }}
              >
                {analytics.recentViews.slice(0, 20).map((view: ViewLog) => (
                  <tr key={view.id}>
                    <td
                      className="px-4 py-3 whitespace-nowrap text-sm"
                      style={{ color: 'var(--text-secondary)' }}
                    >
                      {formatDate(view.viewedAt)}
                    </td>
                    <td
                      className="px-4 py-3 whitespace-nowrap text-sm"
                      style={{ color: 'var(--text-secondary)' }}
                    >
                      {view.viewerIp}
                    </td>
                    <td
                      className="px-4 py-3 text-sm max-w-xs truncate"
                      style={{ color: 'var(--text-secondary)' }}
                      title={view.referrer || undefined}
                    >
                      {view.referrer || '-'}
                    </td>
                    <td className="px-4 py-3 whitespace-nowrap text-sm">
                      {view.isProxyDetected ? (
                        <span className="inline-flex items-center px-2 py-0.5 rounded text-xs font-medium bg-yellow-100 text-yellow-800 dark:bg-yellow-900/30 dark:text-yellow-400">
                          Detected
                        </span>
                      ) : (
                        <span style={{ color: 'var(--text-muted)' }}>-</span>
                      )}
                    </td>
                  </tr>
                ))}
              </tbody>
            </table>
          </div>
        )}
      </div>

      {/* Refresh Button */}
      <div className="flex justify-end">
        <button onClick={fetchData} className="btn btn-secondary text-sm">
          Refresh
        </button>
      </div>
    </div>
  );
}

function formatDate(date: Date): string {
  const now = new Date();
  const diff = now.getTime() - date.getTime();

  if (diff < 60000) {
    return 'Just now';
  }
  if (diff < 3600000) {
    const mins = Math.floor(diff / 60000);
    return `${mins}m ago`;
  }
  if (diff < 86400000) {
    const hours = Math.floor(diff / 3600000);
    return `${hours}h ago`;
  }

  return date.toLocaleDateString(undefined, {
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit',
  });
}