refactor: split registration page into focused parts

test/pages/registration/registration_calculations_test.dart

@@ -0,0 +1,95 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pad_scanner/pages/registration/registration_calculations.dart';
+import 'package:pad_scanner/services/api_service.dart';
+
+void main() {
+  group('registration calculations', () {
+    test('calculates overview stats by item status', () {
+      final stats = overviewStats(
+        _overview([
+          _item('R1', status: 'not_shelved'),
+          _item('R2', status: 'on_shelf'),
+          _item('R3', status: 'transferred'),
+        ]),
+      );
+
+      expect(stats.totalCount, 3);
+      expect(stats.shelvedCount, 1);
+      expect(stats.transferredCount, 1);
+    });
+
+    test('splits overview items into scanned and unscanned groups', () {
+      final sections = splitOverviewItems(
+        overview: _overview([_item('R1'), _item('R2'), _item('R3')]),
+        zongpaiNos: ['R1', 'R3'],
+      );
+
+      expect(sections.scanned.map((item) => item.zongpaiNo), ['R1', 'R3']);
+      expect(sections.unscanned.map((item) => item.zongpaiNo), ['R2']);
+      expect(sections.hasDivider, isTrue);
+    });
+
+    test('finds located scanned items', () {
+      final overview = _overview([
+        _item('R1', status: 'on_shelf'),
+        _item('R2', status: 'transferred'),
+        _item('R3', status: 'on_shelf'),
+      ]);
+
+      expect(
+        findOnShelfItemsInScanned(
+          overview: overview,
+          zongpaiNos: ['R1', 'R2'],
+        ).map((item) => item.zongpaiNo),
+        ['R1'],
+      );
+      expect(
+        findTransferredItemsInScanned(
+          overview: overview,
+          zongpaiNos: ['R1', 'R2'],
+        ).map((item) => item.zongpaiNo),
+        ['R2'],
+      );
+      expect(
+        hasAnyLocatedInScanned(overview: overview, zongpaiNos: ['R1']),
+        isTrue,
+      );
+      expect(
+        hasAnyLocatedInScanned(overview: overview, zongpaiNos: ['R4']),
+        isFalse,
+      );
+    });
+
+    test('maps row colors for scanned and unscanned states', () {
+      expect(
+        registrationBarColor(
+          status: 'on_shelf',
+          isScanned: true,
+          isTransitTarget: false,
+        ),
+        Colors.red,
+      );
+      expect(
+        registrationRowBgColor(
+          status: 'transferred',
+          isScanned: false,
+          isTransitTarget: false,
+        ),
+        const Color(0xFFFFF3E0),
+      );
+    });
+  });
+}
+
+PaichaOverviewResult _overview(List<PaichaOverviewItem> items) {
+  return PaichaOverviewResult(
+    success: true,
+    totalCount: items.length,
+    items: items,
+  );
+}
+
+PaichaOverviewItem _item(String zongpaiNo, {String status = 'not_shelved'}) {
+  return PaichaOverviewItem(zongpaiNo: zongpaiNo, quantity: 1, status: status);
+}