Change Database

app/api/mahasiswa/ipk/route.ts

@@ -1,21 +1,49 @@
 import { NextResponse } from 'next/server';
-import pool from '@/lib/db';
-import { RowDataPacket } from 'mysql2';
+import supabase from '@/lib/db';
 
-interface IPKData extends RowDataPacket {
+interface IPKData {
   tahun_angkatan: number;
   rata_rata_ipk: number;
 }
 
 export async function GET() {
-  const connection = await pool.getConnection();
-  
   try {
-    const [results] = await connection.query<IPKData[]>(`
-      SELECT tahun_angkatan, ROUND(AVG(ipk), 2) AS rata_rata_ipk
-      FROM mahasiswa
-      GROUP BY tahun_angkatan
-    `);
+    const { data, error } = await supabase
+      .from('mahasiswa')
+      .select('tahun_angkatan, ipk')
+      .not('ipk', 'is', null);
+
+    if (error) {
+      console.error('Error fetching IPK data:', error);
+      return NextResponse.json(
+        { error: 'Failed to fetch IPK data' },
+        { 
+          status: 500,
+          headers: {
+            'Access-Control-Allow-Origin': '*',
+            'Access-Control-Allow-Methods': 'GET, OPTIONS',
+            'Access-Control-Allow-Headers': 'Content-Type, Authorization',
+          },
+        }
+      );
+    }
+
+    // Group by tahun_angkatan and calculate average IPK
+    const groupedData = data.reduce((acc, item) => {
+      const tahun = item.tahun_angkatan;
+      if (!acc[tahun]) {
+        acc[tahun] = { sum: 0, count: 0 };
+      }
+      acc[tahun].sum += item.ipk || 0;
+      acc[tahun].count += 1;
+      return acc;
+    }, {} as Record<number, { sum: number; count: number }>);
+
+    // Convert to final format
+    const results: IPKData[] = Object.entries(groupedData).map(([tahun, data]) => ({
+      tahun_angkatan: parseInt(tahun),
+      rata_rata_ipk: Math.round((data.sum / data.count) * 100) / 100
+    }));
 
     return NextResponse.json(results, {
       headers: {
@@ -38,7 +66,5 @@ export async function GET() {
         },
       }
     );
-  } finally {
-    connection.release();
   }
 }