All files / src/domains/assets/services asset.service.ts

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import { Injectable, NotFoundException, BadRequestException } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model, Types } from 'mongoose';
import { Asset, AssetCategory, AssetConfiguration } from '../schemas';
 
@Injectable()
export class AssetService {
  constructor(
    @InjectModel(Asset.name)
    private readonly assetModel: Model<Asset>,
    @InjectModel(AssetCategory.name)
    private readonly categoryModel: Model<AssetCategory>,
    @InjectModel(AssetConfiguration.name)
    private readonly configModel: Model<AssetConfiguration>
  ) {}
 
  async createConfig(tenantId: string, data: any): Promise<AssetConfiguration> {
    const config = new this.configModel({
      ...data,
      tenantId
    });
    return config.save();
  }
 
  async getConfig(tenantId: string): Promise<AssetConfiguration> {
    const config = await this.configModel.findOne({ tenantId }).exec();
    if (!config) {
      // Auto-create default config if none exists
      return this.createConfig(tenantId, {});
    }
    return config;
  }
 
  async createCategory(tenantId: string, data: any): Promise<AssetCategory> {
    const duplicate = await this.categoryModel.findOne({ tenantId, categoryCode: data.categoryCode }).exec();
    if (duplicate) throw new BadRequestException(`Category code ${data.categoryCode} already exists.`);
 
    const category = new this.categoryModel({
      ...data,
      tenantId
    });
    return category.save();
  }
 
  async listCategories(tenantId: string): Promise<AssetCategory[]> {
    return this.categoryModel.find({ tenantId }).exec();
  }
 
  async createAsset(tenantId: string, data: any): Promise<Asset> {
    // Unique serial number check
    if (data.serialNumber) {
      const duplicate = await this.assetModel.findOne({
        tenantId,
        serialNumber: data.serialNumber,
        status: { $ne: 'disposed' }
      }).exec();
      if (duplicate) {
        throw new BadRequestException(`Asset with serial number ${data.serialNumber} already exists and is active.`);
      }
    }
 
    const count = await this.assetModel.countDocuments({ tenantId }).exec();
    const assetNumber = `AST-${String(count + 1).padStart(6, '0')}`;
 
    const config = await this.getConfig(tenantId);
    
    // Low value asset capitalization checks
    let status = 'capitalization_pending';
    if (data.purchaseCostMinor < config.capitalizationThresholdMinor) {
      status = 'capitalized'; // auto-capitalize low-value items directly as expense
    }
 
    const asset = new this.assetModel({
      ...data,
      tenantId,
      assetNumber,
      status: data.status || status,
      currentBookValueMinor: data.purchaseCostMinor,
      accumulatedDepreciationMinor: 0
    });
 
    return asset.save();
  }
 
  async getAssetById(tenantId: string, id: string): Promise<Asset> {
    const asset = await this.assetModel.findOne({ _id: id, tenantId }).exec();
    if (!asset) throw new NotFoundException(`Asset ${id} not found.`);
    return asset;
  }
 
  async listAssets(tenantId: string, filters: any = {}): Promise<any> {
    const query: any = { tenantId };
    if (filters.status) query.status = filters.status;
    if (filters.categoryId) query.categoryId = filters.categoryId;
    if (filters.condition) query.condition = filters.condition;
    
    const limit = parseInt(filters.limit) || 20;
    const skip = parseInt(filters.skip) || 0;
 
    const data = await this.assetModel.find(query).sort({ createdAt: -1 }).skip(skip).limit(limit).exec();
    const total = await this.assetModel.countDocuments(query).exec();
 
    return { data, total, limit, skip };
  }
 
  async updateAssetStatus(tenantId: string, id: string, status: string, additionalUpdate: any = {}): Promise<Asset> {
    const asset = await this.getAssetById(tenantId, id);
    asset.status = status;
    Object.assign(asset, additionalUpdate);
    return asset.save();
  }
}