All files / src/domains/inventory/stock-ledger/services ledger.service.ts

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import { Injectable, BadRequestException } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { StockLedgerEntry, StockBalance } from '../schemas/ledger.schema';
import { ConfigurationService } from '../../configuration/services/configuration.service';
import { EventBusService } from '../../../../platform/events/event-bus.service';
 
@Injectable()
export class LedgerService {
  constructor(
    @InjectModel(StockLedgerEntry.name)
    private readonly ledgerModel: Model<StockLedgerEntry>,
    @InjectModel(StockBalance.name)
    private readonly balanceModel: Model<StockBalance>,
    private readonly configService: ConfigurationService,
    private readonly eventBus: EventBusService
  ) {}
 
  async postLedgerEntry(tenantId: string, data: any, userId: string): Promise<StockLedgerEntry> {
    // 1. Idempotency Check using unique correlationId
    const existing = await this.ledgerModel.findOne({ tenantId, correlationId: data.correlationId }).exec();
    if (existing) {
      return existing; // Already posted
    }
 
    // 2. Fetch inventory configuration
    const config = await this.configService.getConfiguration(tenantId);
 
    // 3. Verify stock availability if negative stock is not allowed
    if (!config.negativeStockAllowed && data.quantityChange < 0) {
      const balance = await this.balanceModel.findOne({
        tenantId,
        itemCode: data.itemCode,
        warehouseId: data.warehouseId,
        locationId: data.locationId || null,
        batchNumber: data.batchNumber || null,
        serialNumber: data.serialNumber || null,
      }).exec();
 
      const currentQty = balance ? balance.quantityAvailable : 0;
      if (currentQty + data.quantityChange < 0) {
        throw new BadRequestException(
          `Insufficient stock available for item ${data.itemCode} in warehouse ${data.warehouseId}. Current: ${currentQty}, Requested change: ${data.quantityChange}`
        );
      }
    }
 
    // 4. Create Ledger Entry
    const entry = await this.ledgerModel.create({
      ...data,
      tenantId,
      postedBy: userId,
      postingDate: new Date(),
    });
 
    // 5. Atomic Stock Balance update with optimistic locking loop
    let updated = false;
    let attempts = 0;
    const qtyChange = data.quantityChange;
 
    while (!updated && attempts < 10) {
      const balance = await this.balanceModel.findOne({
        tenantId,
        itemCode: data.itemCode,
        warehouseId: data.warehouseId,
        locationId: data.locationId || null,
        batchNumber: data.batchNumber || null,
        serialNumber: data.serialNumber || null,
      }).exec();
 
      if (!balance) {
        if (!config.negativeStockAllowed && qtyChange < 0) {
          throw new BadRequestException(`Insufficient stock for item ${data.itemCode}`);
        }
        try {
          await this.balanceModel.create({
            tenantId,
            itemCode: data.itemCode,
            warehouseId: data.warehouseId,
            locationId: data.locationId || null,
            batchNumber: data.batchNumber || null,
            serialNumber: data.serialNumber || null,
            quantityOnHand: qtyChange,
            quantityAvailable: qtyChange,
            movingAverageUnitCost: data.unitCost || 0,
            totalValue: qtyChange * (data.unitCost || 0),
            version: 1,
          });
          updated = true;
        } catch (err) {
          // Fall through to retry on duplicate key insertion
        }
      } else {
        const newOnHand = balance.quantityOnHand + qtyChange;
        const newAvailable = balance.quantityAvailable + qtyChange;
        if (!config.negativeStockAllowed && newAvailable < 0) {
          throw new BadRequestException(`Insufficient stock for item ${data.itemCode}`);
        }
 
        const res = await this.balanceModel.updateOne(
          { _id: balance._id, version: balance.version },
          {
            $inc: { quantityOnHand: qtyChange, quantityAvailable: qtyChange },
            $set: {
              version: balance.version + 1,
              movingAverageUnitCost: data.unitCost || balance.movingAverageUnitCost,
              totalValue: newOnHand * (data.unitCost || balance.movingAverageUnitCost),
            },
          }
        ).exec();
 
        if (res.modifiedCount > 0) {
          updated = true;
        }
      }
      attempts++;
    }
 
    if (!updated) {
      throw new BadRequestException('Failed to update stock balance due to high concurrent requests write conflicts');
    }
 
    // Publish stock posted event
    await this.eventBus.publish('inventory.stock-posted.v1', {
      tenantId,
      itemCode: data.itemCode,
      warehouseId: data.warehouseId,
      quantityChange: qtyChange,
      correlationId: data.correlationId,
    }, tenantId);
 
    return entry;
  }
 
  async getBalances(tenantId: string, query: any = {}): Promise<StockBalance[]> {
    const filter: any = { tenantId };
    if (query.itemCode) filter.itemCode = query.itemCode;
    if (query.warehouseId) filter.warehouseId = query.warehouseId;
    return this.balanceModel.find(filter).exec();
  }
 
  async getLedgerEntries(tenantId: string, itemCode?: string): Promise<StockLedgerEntry[]> {
    const filter: any = { tenantId };
    if (itemCode) filter.itemCode = itemCode;
    return this.ledgerModel.find(filter).sort({ postingDate: -1 }).exec();
  }
}