import { Suspense } from 'react';
import { cookies } from 'next/headers';
import { redirect } from 'next/navigation';
import Dashboard from "@/components/dashboard/dashboard";
import AnalyticsDashboard from '@/components/analytics/AnalyticsDashboard';
import StoreSelector from '@/components/analytics/StoreSelector';
import { getAnalyticsOverviewServer } from '@/lib/server-api';
import { fetchServer } from '@/lib/api';
import { performance } from 'perf_hooks';
import { Info, GitCommit, User, Zap, BarChart3 } from 'lucide-react';
import packageJson from '../../../package.json';
import { getGitInfo } from '@/lib/utils/git';

// Vendor type for consistency
interface Vendor {
  _id: string;
  username: string;
  storeId: string;
  pgpKey: string;
  __v: number;
}

interface User {
  vendor: Vendor;
}

export default async function AnalyticsPage({
  searchParams,
}: {
  searchParams: Promise<{ storeId?: string }>;
}) {
  const startTime = performance.now();

  // Await searchParams as required by Next.js 15+
  const resolvedSearchParams = await searchParams;
  
  // Check for storeId in query parameters (for staff users)
  const storeId = resolvedSearchParams?.storeId;
  
  // Check for storeId in cookies (alternative method for staff users)
  const cookieStore = await cookies();
  const cookieStoreId = cookieStore.get('storeId')?.value;
  
  // Use query parameter first, then cookie, then undefined (for vendors)
  const finalStoreId = storeId || cookieStoreId;

  try {
    // Fetch user data and analytics data in parallel
    const [userResponse, initialData] = await Promise.all([
      fetchServer<User>("/auth/me"),
      getAnalyticsOverviewServer(finalStoreId)
    ]);

    // Get git info using the utility
    const gitInfo = getGitInfo();

    const endTime = performance.now();
    const generationTime = (endTime - startTime).toFixed(2);
    const panelVersion = packageJson.version;
    const commitHash = gitInfo.hash;

    const vendor = userResponse.vendor;

    return (
      <Dashboard>
        <div className="space-y-6">
          {/* Analytics Content */}
          <Suspense fallback={
            <div className="flex items-center justify-center h-64">
              <div className="text-center">
                <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary mx-auto mb-4"></div>
                <p className="text-muted-foreground">Loading analytics...</p>
              </div>
            </div>
          }>
            <AnalyticsDashboard initialData={initialData} />
          </Suspense>
        </div>

        <div className="fixed bottom-2 right-2 text-xs text-muted-foreground bg-background/80 backdrop-blur-sm px-2 py-1 rounded border border-border/50 z-50 flex items-center space-x-2">
          <div className="flex items-center gap-1">
            <Info size={12} className="text-muted-foreground/80" /> 
            <span>v{panelVersion}</span>
          </div>

          <div className="flex items-center gap-1">
            <User size={12} className="text-muted-foreground/80" />
            <span>{vendor.username}</span>
          </div>

          <div className="flex items-center gap-1">
            <GitCommit size={12} className="text-muted-foreground/80" />
            <span>{commitHash}</span>
          </div>

          <div className="flex items-center gap-1">
            <Zap size={12} className="text-amber-500" />
            <span>Generated in {generationTime}ms</span>
          </div>

          <span className="px-1.5 py-0.5 text-xs rounded-sm bg-emerald-500/20 text-emerald-300">
            {process.env.NODE_ENV || 'development'}
          </span>
        </div>
      </Dashboard>
    );
  } catch (error) {
    console.error('Error fetching analytics data:', error);
    
    // If it's a 401/403 error, redirect to login
    if (error instanceof Error && error.message.includes('401')) {
      redirect('/login');
    }
    
    // If it's a 400 error (missing storeId for staff), show store selector
    if (error instanceof Error && error.message.includes('400')) {
      return (
        <Dashboard>
          <div className="space-y-6">
            <div className="text-center mb-8">
              <h1 className="text-3xl font-bold text-foreground mb-4">Analytics Dashboard</h1>
              <p className="text-muted-foreground">
                Please select a store to view analytics data.
              </p>
            </div>
            <StoreSelector />
          </div>
        </Dashboard>
      );
    }
    
    // For other errors, show a fallback
    return (
      <Dashboard>
        <div className="space-y-6">
          <div className="text-center py-8">
            <h1 className="text-3xl font-bold text-foreground mb-4">Analytics Dashboard</h1>
            <p className="text-muted-foreground">
              Unable to load analytics data. Please try refreshing the page.
            </p>
            {finalStoreId && (
              <p className="text-sm text-muted-foreground mt-2">
                Accessing store: {finalStoreId}
              </p>
            )}
          </div>
        </div>
      </Dashboard>
    );
  }
}