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

export async function POST(request: NextRequest) {
  try {
    // Rate limiting
    const ip = request.headers.get('x-forwarded-for') || request.headers.get('x-real-ip') || 'unknown';
    if (!checkRateLimit(ip, 100, 60000)) { // 100 requests per minute for tracking
      return new NextResponse(
        JSON.stringify({ error: 'Rate limit exceeded' }), 
        { 
          status: 429, 
          headers: { 
            'Content-Type': 'application/json',
            ...getRateLimitHeaders(ip, 100, 60000)
          } 
        }
      );
    }

    const body = await request.json();
    const { type, projectId, page, performance, session } = body;
    const userAgent = request.headers.get('user-agent') || undefined;
    const referrer = request.headers.get('referer') || undefined;

    // Track page view
    if (type === 'pageview' && page) {
      const projectIdNum = projectId ? parseInt(projectId.toString()) : null;
      
      // Create page view record
      await prisma.pageView.create({
        data: {
          projectId: projectIdNum,
          page,
          ip,
          userAgent,
          referrer
        }
      });

      // Update project analytics if projectId exists
      if (projectIdNum) {
        const project = await prisma.project.findUnique({
          where: { id: projectIdNum }
        });

        if (project) {
          const analytics = (project.analytics as Record<string, unknown>) || {};
          const currentViews = (analytics.views as number) || 0;
          
          await prisma.project.update({
            where: { id: projectIdNum },
            data: {
              analytics: {
                ...analytics,
                views: currentViews + 1,
                lastUpdated: new Date().toISOString()
              }
            }
          });
        }
      }
    }

    // Track performance metrics
    if (type === 'performance' && performance) {
      // Try to get projectId from page path if not provided
      let projectIdNum: number | null = null;
      if (projectId) {
        projectIdNum = parseInt(projectId.toString());
      } else if (page) {
        // Try to extract from page path like /projects/123 or /projects/slug
        const match = page.match(/\/projects\/(\d+)/);
        if (match) {
          projectIdNum = parseInt(match[1]);
        } else {
          // Try to find by slug
          const slugMatch = page.match(/\/projects\/([^\/]+)/);
          if (slugMatch) {
            const slug = slugMatch[1];
            const project = await prisma.project.findFirst({
              where: {
                OR: [
                  { id: parseInt(slug) || 0 },
                  { title: { contains: slug, mode: 'insensitive' } }
                ]
              }
            });
            if (project) projectIdNum = project.id;
          }
        }
      }

      if (projectIdNum) {
        const project = await prisma.project.findUnique({
          where: { id: projectIdNum }
        });

        if (project) {
          const perf = (project.performance as Record<string, unknown>) || {};
          const analytics = (project.analytics as Record<string, unknown>) || {};
          
          // Calculate lighthouse score from web vitals
          const lcp = performance.lcp || 0;
          const fid = performance.fid || 0;
          const cls = performance.cls || 0;
          const fcp = performance.fcp || 0;
          const ttfb = performance.ttfb || 0;
          
          // Only calculate lighthouse score if we have real web vitals data
          // Check if we have at least LCP and FCP (most important metrics)
          if (lcp > 0 || fcp > 0) {
            // Simple lighthouse score calculation (0-100)
            let lighthouseScore = 100;
            if (lcp > 4000) lighthouseScore -= 25;
            else if (lcp > 2500) lighthouseScore -= 15;
            if (fid > 300) lighthouseScore -= 25;
            else if (fid > 100) lighthouseScore -= 15;
            if (cls > 0.25) lighthouseScore -= 25;
            else if (cls > 0.1) lighthouseScore -= 15;
            if (fcp > 3000) lighthouseScore -= 15;
            if (ttfb > 800) lighthouseScore -= 10;
            
            lighthouseScore = Math.max(0, Math.min(100, lighthouseScore));

            await prisma.project.update({
              where: { id: projectIdNum },
              data: {
                performance: {
                  ...perf,
                  lighthouse: lighthouseScore,
                  loadTime: performance.loadTime || perf.loadTime || 0,
                  firstContentfulPaint: fcp || perf.firstContentfulPaint || 0,
                  largestContentfulPaint: lcp || perf.largestContentfulPaint || 0,
                  cumulativeLayoutShift: cls || perf.cumulativeLayoutShift || 0,
                  totalBlockingTime: performance.tbt || perf.totalBlockingTime || 0,
                  speedIndex: performance.si || perf.speedIndex || 0,
                  coreWebVitals: {
                    lcp: lcp || (perf.coreWebVitals as Record<string, unknown>)?.lcp || 0,
                    fid: fid || (perf.coreWebVitals as Record<string, unknown>)?.fid || 0,
                    cls: cls || (perf.coreWebVitals as Record<string, unknown>)?.cls || 0
                  },
                  lastUpdated: new Date().toISOString()
                },
                analytics: {
                  ...analytics,
                  lastUpdated: new Date().toISOString()
                }
              }
            });
          }
        }
      }
    }

    // Track session data (for bounce rate calculation)
    if (type === 'session' && session) {
      // Store session data in a way that allows bounce rate calculation
      // A bounce is a session with only one pageview
      // We'll track this via PageView records and calculate bounce rate from them
    }

    return NextResponse.json({ success: true });
  } catch (error) {
    if (process.env.NODE_ENV === 'development') {
      console.error('Analytics tracking error:', error);
    }
    return NextResponse.json(
      { error: 'Failed to track analytics' },
      { status: 500 }
    );
  }
}