Initial commit

src/app/api/admin/metrics/route.ts

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+/**
+ * Component: Admin Metrics API
+ * Documentation: documentation/admin-dashboard.md
+ */
+
+import { NextRequest, NextResponse } from 'next/server';
+import { requireAuth, requireAdmin, AuthenticatedRequest } from '@/lib/middleware/auth';
+import { prisma } from '@/lib/db';
+
+export async function GET(request: NextRequest) {
+  return requireAuth(request, async (req: AuthenticatedRequest) => {
+    return requireAdmin(req, async () => {
+      try {
+        // Get system metrics
+    const thirtyDaysAgo = new Date();
+    thirtyDaysAgo.setDate(thirtyDaysAgo.getDate() - 30);
+
+    const [
+      totalRequests,
+      activeDownloads,
+      completedLast30Days,
+      failedLast30Days,
+      totalUsers,
+    ] = await Promise.all([
+      // Total requests (all time)
+      prisma.request.count(),
+
+      // Active downloads (downloading status)
+      prisma.request.count({
+        where: {
+          status: 'downloading',
+        },
+      }),
+
+      // Completed requests (last 30 days) - 'downloaded' and 'available' statuses
+      prisma.request.count({
+        where: {
+          status: {
+            in: ['downloaded', 'available'],
+          },
+          completedAt: {
+            gte: thirtyDaysAgo,
+          },
+        },
+      }),
+
+      // Failed requests (last 30 days)
+      prisma.request.count({
+        where: {
+          status: 'failed',
+          updatedAt: {
+            gte: thirtyDaysAgo,
+          },
+        },
+      }),
+
+      // Total users
+      prisma.user.count(),
+    ]);
+
+    // Check system health
+    const systemHealth = await checkSystemHealth();
+
+    return NextResponse.json({
+      totalRequests,
+      activeDownloads,
+      completedLast30Days,
+      failedLast30Days,
+      totalUsers,
+      systemHealth,
+    });
+      } catch (error) {
+        console.error('[Admin] Failed to fetch metrics:', error);
+        return NextResponse.json(
+          { error: 'Failed to fetch metrics' },
+          { status: 500 }
+        );
+      }
+    });
+  });
+}
+
+async function checkSystemHealth(): Promise<{
+  status: 'healthy' | 'degraded' | 'unhealthy';
+  issues: string[];
+}> {
+  const issues: string[] = [];
+
+  try {
+    // Check database connection
+    await prisma.$queryRaw`SELECT 1`;
+  } catch (error) {
+    issues.push('Database connection failed');
+  }
+
+  // Check for stale downloads (downloading for more than 24 hours)
+  const oneDayAgo = new Date();
+  oneDayAgo.setHours(oneDayAgo.getHours() - 24);
+
+  const staleDownloads = await prisma.request.count({
+    where: {
+      status: 'downloading',
+      updatedAt: {
+        lt: oneDayAgo,
+      },
+    },
+  });
+
+  if (staleDownloads > 0) {
+    issues.push(`${staleDownloads} stale downloads (>24h)`);
+  }
+
+  // Determine overall status
+  let status: 'healthy' | 'degraded' | 'unhealthy' = 'healthy';
+  if (issues.length > 0) {
+    status = issues.some((i) => i.includes('Database')) ? 'unhealthy' : 'degraded';
+  }
+
+  return { status, issues };
+}