import { NextRequest, NextResponse } from 'next/server';
import { prisma } from '@/lib/prisma';
import { requireAdminAuth } from '@/lib/auth';

export async function GET(request: NextRequest) {
  try {
    // Check admin authentication - for admin dashboard requests, we trust the session
    const isAdminRequest = request.headers.get('x-admin-request') === 'true';
    if (!isAdminRequest) {
      const authError = requireAdminAuth(request);
      if (authError) {
        return authError;
      }
    }

    // Get performance data from database
    const pageViews = await prisma.pageView.findMany({
      orderBy: { timestamp: 'desc' },
      take: 1000 // Last 1000 page views
    });

    const userInteractions = await prisma.userInteraction.findMany({
      orderBy: { timestamp: 'desc' },
      take: 1000 // Last 1000 interactions
    });

    // Calculate performance metrics
    const performance = {
      pageViews: {
        total: pageViews.length,
        last24h: pageViews.filter(pv => {
          const dayAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);
          return new Date(pv.timestamp) > dayAgo;
        }).length,
        last7d: pageViews.filter(pv => {
          const weekAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
          return new Date(pv.timestamp) > weekAgo;
        }).length,
        last30d: pageViews.filter(pv => {
          const monthAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
          return new Date(pv.timestamp) > monthAgo;
        }).length
      },
      interactions: {
        total: userInteractions.length,
        last24h: userInteractions.filter(ui => {
          const dayAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);
          return new Date(ui.timestamp) > dayAgo;
        }).length,
        last7d: userInteractions.filter(ui => {
          const weekAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
          return new Date(ui.timestamp) > weekAgo;
        }).length,
        last30d: userInteractions.filter(ui => {
          const monthAgo = new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
          return new Date(ui.timestamp) > monthAgo;
        }).length
      },
      topPages: pageViews.reduce((acc, pv) => {
        acc[pv.page] = (acc[pv.page] || 0) + 1;
        return acc;
      }, {} as Record<string, number>),
      topInteractions: userInteractions.reduce((acc, ui) => {
        acc[ui.type] = (acc[ui.type] || 0) + 1;
        return acc;
      }, {} as Record<string, number>)
    };

    return NextResponse.json(performance);
  } catch (error) {
    console.error('Performance analytics error:', error);
    return NextResponse.json(
      { error: 'Failed to fetch performance data' },
      { status: 500 }
    );
  }
}