All files / src/domains/procurement/purchase-orders/services purchase-order.service.ts

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import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { PurchaseOrder } from '../schemas/purchase-order.schema';
import { EventBusService } from '../../../../platform/events/event-bus.service';
import { AuditLogService } from '../../../../platform/audit/audit-log.service';
import { TaxMasterService } from '../../../mdm/application/services/tax-master.service';
 
@Injectable()
export class PurchaseOrderService {
  constructor(
    @InjectModel(PurchaseOrder.name)
    private readonly poModel: Model<PurchaseOrder>,
    private readonly taxMasterService: TaxMasterService,
    private readonly eventBus: EventBusService,
    private readonly auditLog: AuditLogService,
  ) {}
 
  async createPurchaseOrder(tenantId: string, data: any, userId: string): Promise<PurchaseOrder> {
    const count = await this.poModel.countDocuments({ tenantId }).exec();
    const poNumber = `PO-${new Date().getFullYear()}-${(count + 1).toString().padStart(5, '0')}`;
 
    let subtotal = 0;
    let totalTax = 0;
 
    const itemsWithTax = await Promise.all((data.items || []).map(async (item: any) => {
      const lineSubtotal = item.quantity * item.unitPrice;
      subtotal += lineSubtotal;
 
      // Overhaul tax calculations using MDM Tax resolver
      const resolved = await this.taxMasterService.resolve({
        countryCode: data.countryCode || 'US',
        regionCode: data.regionCode || 'CA',
        taxCategoryCode: item.taxCode || 'GST',
        transactionDate: new Date(),
        tenantId,
      });
 
      // Map resolved rates to snapshots
      const snapshots = resolved.map(r => {
        const rateVal = parseFloat(r.rate) || 0;
        const taxVal = lineSubtotal * rateVal;
        return {
          taxCode: r.taxCode,
          rate: rateVal,
          taxableAmount: lineSubtotal,
          taxAmount: taxVal,
          jurisdiction: r.jurisdictionLevel,
          inclusive: false,
          calculationOrder: 1,
        };
      });
 
      const lineTax = snapshots.reduce((sum, s) => sum + s.taxAmount, 0);
      totalTax += lineTax;
 
      return {
        ...item,
        total: lineSubtotal,
        taxSnapshots: snapshots,
      };
    }));
 
    const totalAmount = subtotal + totalTax;
 
    const po = await this.poModel.create({
      ...data,
      items: itemsWithTax,
      tenantId,
      poNumber,
      subtotal,
      tax: totalTax,
      totalAmount,
      status: 'submitted',
    });
 
    await this.eventBus.publish('procurement.purchase-order.created.v1', {
      poId: (po as any)._id.toString(),
      tenantId,
      totalAmount,
    }, tenantId);
 
    await this.auditLog.log({
      tenantId,
      userId,
      action: 'CREATE',
      resource: 'PurchaseOrder',
      resourceId: (po as any)._id.toString(),
      newValues: { poNumber, totalAmount },
    });
 
    return po;
  }
 
  async getPurchaseOrders(tenantId: string): Promise<PurchaseOrder[]> {
    return this.poModel.find({ tenantId }).exec();
  }
 
  async getPurchaseOrderById(tenantId: string, id: string): Promise<PurchaseOrder> {
    const po = await this.poModel.findOne({ _id: id, tenantId }).exec();
    if (!po) throw new NotFoundException('Purchase Order not found');
    return po;
  }
 
  async approvePurchaseOrder(tenantId: string, id: string, userId: string): Promise<PurchaseOrder> {
    const po = await this.poModel.findOneAndUpdate(
      { _id: id, tenantId, status: 'submitted' },
      { status: 'approved', approvedBy: userId, approvalDate: new Date() },
      { new: true }
    ).exec();
 
    if (!po) throw new NotFoundException('Purchase Order not found or not in submitted status');
 
    await this.eventBus.publish('procurement.purchase-order.approved.v1', {
      poId: id,
      tenantId,
    }, tenantId);
 
    await this.eventBus.publish('procurement.purchase-order.issued.v1', {
      eventId: `evt-po-iss-${po._id.toString()}`,
      occurredAt: new Date(),
      idempotencyKey: `idemp-po-iss-${po._id.toString()}`,
      tenantId,
      purchaseOrderId: po._id.toString(),
      poNumber: po.poNumber,
      vendorId: po.vendorId,
      totalAmount: po.totalAmount,
    }, tenantId);
 
    await this.auditLog.log({
      tenantId,
      userId,
      action: 'APPROVE',
      resource: 'PurchaseOrder',
      resourceId: id,
      newValues: { poNumber: po.poNumber },
    });
 
    return po;
  }
 
  async recordReceipt(tenantId: string, id: string, status: string): Promise<PurchaseOrder> {
    const po = await this.poModel.findOneAndUpdate(
      { _id: id, tenantId },
      { status },
      { new: true }
    ).exec();
    if (!po) throw new NotFoundException('Purchase Order not found');
    return po;
  }
}