feat: improve patient flow and pricing workflow

lib/core/services/finance_service.dart

@@ -0,0 +1,117 @@
+import 'package:pocketbase/pocketbase.dart';
+
+import '../api/pocketbase_client.dart';
+
+class FinanceService {
+  FinanceService._();
+  static final instance = FinanceService._();
+
+  PocketBase get _pb => PocketBaseClient.instance.pb;
+
+  Future<void> ensureEntriesForJob({
+    required String jobId,
+    required String clinicTenantId,
+    required String labTenantId,
+    required String clinicName,
+    required String labName,
+    required double amount,
+    required String currency,
+  }) async {
+    if (amount <= 0) return;
+
+    final existing = await _pb.collection('finance_entries').getFullList(
+      filter: 'job_id = "$jobId"',
+      batch: 200,
+    );
+
+    await _upsertEntry(
+      existing: existing,
+      jobId: jobId,
+      tenantId: clinicTenantId,
+      counterpartyTenantId: labTenantId,
+      counterpartyName: labName,
+      type: 'payable',
+      amount: amount,
+      currency: currency,
+    );
+
+    await _upsertEntry(
+      existing: existing,
+      jobId: jobId,
+      tenantId: labTenantId,
+      counterpartyTenantId: clinicTenantId,
+      counterpartyName: clinicName,
+      type: 'receivable',
+      amount: amount,
+      currency: currency,
+    );
+  }
+
+  Future<void> markJobPaid(String jobId) async {
+    final existing = await _pb.collection('finance_entries').getFullList(
+      filter: 'job_id = "$jobId"',
+      batch: 200,
+    );
+    final paidAt = DateTime.now().toIso8601String();
+    for (final record in existing) {
+      await _pb.collection('finance_entries').update(
+        record.id,
+        body: {
+          'status': 'paid',
+          'paid_at': paidAt,
+        },
+      );
+    }
+  }
+
+  Future<void> deletePendingEntriesForJob(String jobId) async {
+    final existing = await _pb.collection('finance_entries').getFullList(
+      filter: 'job_id = "$jobId" && status = "pending"',
+      batch: 200,
+    );
+    for (final record in existing) {
+      await _pb.collection('finance_entries').delete(record.id);
+    }
+  }
+
+  Future<void> _upsertEntry({
+    required List<RecordModel> existing,
+    required String jobId,
+    required String tenantId,
+    required String counterpartyTenantId,
+    required String counterpartyName,
+    required String type,
+    required double amount,
+    required String currency,
+  }) async {
+    RecordModel? match;
+    try {
+      match = existing.firstWhere(
+        (record) =>
+            record.data['tenant_id'] == tenantId &&
+            record.data['type'] == type,
+      );
+    } catch (_) {
+      match = null;
+    }
+
+    final body = {
+      'tenant_id': tenantId,
+      'job_id': jobId,
+      'type': type,
+      'amount': amount,
+      'currency': currency,
+      'status': 'pending',
+      'paid_at': null,
+      'counterparty_tenant_id': counterpartyTenantId,
+      'counterparty_name': counterpartyName,
+    };
+
+    if (match == null) {
+      await _pb.collection('finance_entries').create(body: body);
+      return;
+    }
+
+    await _pb.collection('finance_entries').update(match.id, body: body);
+  }
+}

lib/core/services/pricing_service.dart

@@ -0,0 +1,87 @@
+import '../../models/clinic_discount.dart';
+import '../../models/job.dart';
+import '../../models/prosthetic_product.dart';
+
+class PricingBreakdown {
+  const PricingBreakdown({
+    required this.billableUnits,
+    required this.unitPrice,
+    required this.baseAmount,
+    required this.discountAmount,
+    required this.finalAmount,
+    required this.appliedDiscounts,
+  });
+
+  final int billableUnits;
+  final double unitPrice;
+  final double baseAmount;
+  final double discountAmount;
+  final double finalAmount;
+  final List<ClinicDiscount> appliedDiscounts;
+}
+
+class PricingService {
+  PricingService._();
+  static final instance = PricingService._();
+
+  int billableUnitsForType(ProstheticType type, int memberCount) {
+    final safeCount = memberCount <= 0 ? 1 : memberCount;
+    return switch (type) {
+      ProstheticType.tamProtez || ProstheticType.parsiyel => 1,
+      _ => safeCount,
+    };
+  }
+
+  String unitLabelForType(ProstheticType type) {
+    return switch (type) {
+      ProstheticType.tamProtez || ProstheticType.parsiyel => 'vaka',
+      _ => 'diş',
+    };
+  }
+
+  PricingBreakdown calculate({
+    required ProstheticProduct product,
+    required ProstheticType prostheticType,
+    required int memberCount,
+    required String clinicTenantId,
+    required List<ClinicDiscount> discounts,
+  }) {
+    final billableUnits = billableUnitsForType(prostheticType, memberCount);
+    final unitPrice = product.unitPrice ?? 0;
+    final baseAmount = unitPrice * billableUnits;
+
+    final applicable = discounts.where((discount) {
+      if (!discount.isActive) return false;
+      if (!(discount.appliesToAll || discount.clinicTenantId == clinicTenantId)) {
+        return false;
+      }
+      if (!(discount.appliesToAllTypes ||
+          discount.prostheticType == prostheticType.value)) {
+        return false;
+      }
+      if (discount.minQuantity > 0 && billableUnits < discount.minQuantity) {
+        return false;
+      }
+      return true;
+    }).toList();
+
+    double running = baseAmount;
+    for (final discount in applicable) {
+      running = discount.discountType == DiscountType.percentage
+          ? running * (1 - discount.discountValue / 100)
+          : running - discount.discountValue;
+    }
+
+    final finalAmount = running.clamp(0, double.infinity).toDouble();
+    return PricingBreakdown(
+      billableUnits: billableUnits,
+      unitPrice: unitPrice,
+      baseAmount: baseAmount,
+      discountAmount: (baseAmount - finalAmount)
+          .clamp(0, double.infinity)
+          .toDouble(),
+      finalAmount: finalAmount,
+      appliedDiscounts: applicable,
+    );
+  }
+}