import moment from 'moment';
import { Service, Inject } from 'typedi';
import * as R from 'ramda';
import TenancyService from '@/services/Tenancy/TenancyService';
import FinancialSheet from '../FinancialSheet';
import {
  ICashFlowStatementService,
  ICashFlowStatementQuery,
  ICashFlowStatementDOO,
  IAccountTransaction,
  ICashFlowStatementMeta
} from '@/interfaces';
import CashFlowStatement from './CashFlow';
import Ledger from '@/services/Accounting/Ledger';
import CashFlowRepository from './CashFlowRepository';
import InventoryService from '@/services/Inventory/Inventory';
import { parseBoolean } from 'utils';
import { Tenant } from '@/system/models';

@Service()
export default class CashFlowStatementService
  extends FinancialSheet
  implements ICashFlowStatementService
{
  @Inject()
  tenancy: TenancyService;

  @Inject()
  cashFlowRepo: CashFlowRepository;

  @Inject()
  inventoryService: InventoryService;

  /**
   * Defaults balance sheet filter query.
   * @return {IBalanceSheetQuery}
   */
  get defaultQuery(): ICashFlowStatementQuery {
    return {
      displayColumnsType: 'total',
      displayColumnsBy: 'day',
      fromDate: moment().startOf('year').format('YYYY-MM-DD'),
      toDate: moment().endOf('year').format('YYYY-MM-DD'),
      numberFormat: {
        precision: 2,
        divideOn1000: false,
        showZero: false,
        formatMoney: 'total',
        negativeFormat: 'mines',
      },
      noneZero: false,
      noneTransactions: false,
      basis: 'cash',
    };
  }

  /**
   * Retrieve cash at beginning transactions.
   * @param {number} tenantId -
   * @param {ICashFlowStatementQuery} filter -
   * @retrun {Promise<IAccountTransaction[]>}
   */
  private async cashAtBeginningTransactions(
    tenantId: number,
    filter: ICashFlowStatementQuery
  ): Promise<IAccountTransaction[]> {
    const appendPeriodsOperToChain = (trans) =>
      R.append(
        this.cashFlowRepo.cashAtBeginningPeriodTransactions(tenantId, filter),
        trans
      );

    const promisesChain = R.pipe(
      R.append(
        this.cashFlowRepo.cashAtBeginningTotalTransactions(tenantId, filter)
      ),
      R.when(
        R.always(R.equals(filter.displayColumnsType, 'date_periods')),
        appendPeriodsOperToChain
      )
    )([]);
    const promisesResults = await Promise.all(promisesChain);
    const transactions = R.flatten(promisesResults);

    return transactions;
  }

  /**
   * Retrieve the cash flow sheet statement.
   * @param {number} tenantId
   * @param {ICashFlowStatementQuery} query
   * @returns {Promise<ICashFlowStatementDOO>}
   */
  public async cashFlow(
    tenantId: number,
    query: ICashFlowStatementQuery
  ): Promise<ICashFlowStatementDOO> {
    const i18n = this.tenancy.i18n(tenantId);

    // Retrieve all accounts on the storage.
    const accounts = await this.cashFlowRepo.cashFlowAccounts(tenantId);

    const tenant = await Tenant.query()
      .findById(tenantId)
      .withGraphFetched('metadata');

    const filter = {
      ...this.defaultQuery,
      ...query,
    };
    // Retrieve the accounts transactions.
    const transactions = await this.cashFlowRepo.getAccountsTransactions(
      tenantId,
      filter
    );
    // Retrieve the net income transactions.
    const netIncome = await this.cashFlowRepo.getNetIncomeTransactions(
      tenantId,
      filter
    );
    // Retrieve the cash at beginning transactions.
    const cashAtBeginningTransactions = await this.cashAtBeginningTransactions(
      tenantId,
      filter
    );
    // Transformes the transactions to ledgers.
    const ledger = Ledger.fromTransactions(transactions);
    const cashLedger = Ledger.fromTransactions(cashAtBeginningTransactions);
    const netIncomeLedger = Ledger.fromTransactions(netIncome);

    // Cash flow statement.
    const cashFlowInstance = new CashFlowStatement(
      accounts,
      ledger,
      cashLedger,
      netIncomeLedger,
      filter,
      tenant.metadata.baseCurrency,
      i18n
    );

    return {
      data: cashFlowInstance.reportData(),
      query: filter,
      meta: this.reportMetadata(tenantId),
    };
  }

    /**
   * Retrieve the balance sheet meta.
   * @param {number} tenantId - 
   * @returns {ICashFlowStatementMeta}
   */
     private reportMetadata(tenantId: number): ICashFlowStatementMeta {
      const settings = this.tenancy.settings(tenantId);
  
      const isCostComputeRunning = this.inventoryService
        .isItemsCostComputeRunning(tenantId);
  
      const organizationName = settings.get({
        group: 'organization',
        key: 'name',
      });
      const baseCurrency = settings.get({
        group: 'organization',
        key: 'base_currency',
      });
  
      return {
        isCostComputeRunning: parseBoolean(isCostComputeRunning, false),
        organizationName,
        baseCurrency
      };
    }
}