feat(tatib): ekspor PDF surat peringatan — unduh PDF per surat (F4 resmi via dompdf) + rekap daftar SP (A4 landscape: ringkasan status, tabel rinci, ttd); tombol Ekspor PDF di /sp-letters & Unduh PDF di detail

app/Http/Controllers/SpLetterController.php

@@ -6,6 +6,7 @@ use App\Models\SpLetter;
 use App\Models\Setting;
 use Barryvdh\DomPDF\Facade\Pdf;
 use Illuminate\Http\Request;
+use Illuminate\Support\Str;
 use Illuminate\View\View;
 
 class SpLetterController extends Controller
@@ -39,10 +40,56 @@ class SpLetterController extends Controller
 
         $spLetter->update(['printed_at' => now(), 'status' => 'printed']);
 
-        // For now, return an HTML print view
+        // HTML print view (untuk cetak langsung dari browser)
         return view('sp-letters.print', compact('spLetter', 'school'));
     }
 
+    /**
+     * Unduh PDF surat peringatan (format F4 resmi).
+     */
+    public function pdf(SpLetter $spLetter)
+    {
+        abort_unless(auth()->user()->canViewStudent($spLetter->student_id), 403);
+
+        $spLetter->load(['student', 'spThreshold', 'generator']);
+        $school = $this->schoolSettings();
+        $forPdf = true;
+
+        $spLetter->update(['printed_at' => now(), 'status' => 'printed']);
+
+        $pdf = Pdf::loadView('sp-letters.print', compact('spLetter', 'school', 'forPdf'))
+            ->setPaper([0, 0, 595.28, 935.43], 'portrait'); // F4 (210×330 mm)
+
+        $filename = 'SP-'.Str::slug(str_replace(['/', '\\'], '-', $spLetter->letter_number)).'.pdf';
+
+        return $pdf->download($filename);
+    }
+
+    /**
+     * Ekspor PDF rekap seluruh surat peringatan (daftar, A4 landscape).
+     */
+    public function exportPdf()
+    {
+        $letters = SpLetter::with(['student', 'spThreshold', 'generator'])
+            ->when(auth()->user()->isScopedWaliKelas(), fn ($q) => $q->whereHas('student', fn ($qq) => $qq->whereIn('class_id', auth()->user()->homeroomClassIds())))
+            ->latest()
+            ->get();
+
+        $summary = [
+            'total' => $letters->count(),
+            'total_poin' => $letters->sum('total_points_at_time'),
+            'siswa' => $letters->pluck('student_id')->unique()->count(),
+            'per_status' => $letters->groupBy('status')->map->count(),
+        ];
+
+        $school = $this->schoolSettings();
+
+        $pdf = Pdf::loadView('sp-letters.export-pdf', compact('letters', 'summary', 'school'))
+            ->setPaper('a4', 'landscape');
+
+        return $pdf->download('rekap-surat-peringatan-'.now()->format('Ymd-His').'.pdf');
+    }
+
     /**
      * Data sekolah untuk kop surat (format resmi).
      */