import { mixin, Model, raw } from 'objection';
import moment from 'moment';
import TenantModel from 'models/TenantModel';
import ModelSetting from './ModelSetting';
import SaleInvoiceMeta from './SaleInvoice.Settings';
import CustomViewBaseModel from './CustomViewBaseModel';
import { DEFAULT_VIEWS } from 'services/Sales/constants';
import ModelSearchable from './ModelSearchable';

export default class SaleInvoice extends mixin(TenantModel, [
  ModelSetting,
  CustomViewBaseModel,
  ModelSearchable,
]) {
  /**
   * Table name
   */
  static get tableName() {
    return 'sales_invoices';
  }

  /**
   * Timestamps columns.
   */
  get timestamps() {
    return ['created_at', 'updated_at'];
  }

  /**
   * Virtual attributes.
   */
  static get virtualAttributes() {
    return [
      'dueAmount',
      'isDelivered',
      'isOverdue',
      'isPartiallyPaid',
      'isFullyPaid',
      'isPaid',
      'remainingDays',
      'overdueDays',
    ];
  }

  /**
   * Detarmines whether the invoice is delivered.
   * @return {boolean}
   */
  get isDelivered() {
    return !!this.deliveredAt;
  }

  /**
   * Detarmines the due date is over.
   * @return {boolean}
   */
  get isOverdue() {
    return this.overdueDays > 0;
  }

  /**
   * Retrieve the invoice due amount.
   * Equation (Invoice amount - payment amount = Due amount)
   * @return {boolean}
   */
  get dueAmount() {
    return Math.max(this.balance - this.paymentAmount, 0);
  }

  /**
   * Detarmine whether the invoice paid partially.
   * @return {boolean}
   */
  get isPartiallyPaid() {
    return this.dueAmount !== this.balance && this.dueAmount > 0;
  }

  /**
   * Deetarmine whether the invoice paid fully.
   * @return {boolean}
   */
  get isFullyPaid() {
    return this.dueAmount === 0;
  }

  /**
   * Detarmines whether the invoice paid fully or partially.
   * @return {boolean}
   */
  get isPaid() {
    return this.isPartiallyPaid || this.isFullyPaid;
  }

  /**
   * Retrieve the remaining days in number
   * @return {number|null}
   */
  get remainingDays() {
    // Can't continue in case due date not defined.
    if (!this.dueDate) {
      return null;
    }

    const date = moment();
    const dueDate = moment(this.dueDate);

    return Math.max(dueDate.diff(date, 'days'), 0);
  }

  /**
   * Retrieve the overdue days in number.
   * @return {number|null}
   */
  get overdueDays() {
    return this.getOverdueDays();
  }

  /**
   *
   * @param {*} asDate
   */
  getOverdueDays(asDate = moment().format('YYYY-MM-DD')) {
    // Can't continue in case due date not defined.
    if (!this.dueDate) {
      return null;
    }

    const date = moment(asDate);
    const dueDate = moment(this.dueDate);

    return Math.max(date.diff(dueDate, 'days'), 0);
  }

  /**
   * Model modifiers.
   */
  static get modifiers() {
    return {
      /**
       * Filters the due invoices.
       */
      dueInvoices(query) {
        query.where(raw('BALANCE - PAYMENT_AMOUNT > 0'));
      },
      /**
       * Filters the invoices between the given date range.
       */
      filterDateRange(query, startDate, endDate, type = 'day') {
        const dateFormat = 'YYYY-MM-DD HH:mm:ss';
        const fromDate = moment(startDate).startOf(type).format(dateFormat);
        const toDate = moment(endDate).endOf(type).format(dateFormat);

        if (startDate) {
          query.where('invoice_date', '>=', fromDate);
        }
        if (endDate) {
          query.where('invoice_date', '<=', toDate);
        }
      },
      /**
       * Filters the invoices in draft status.
       */
      draft(query) {
        query.where('delivered_at', null);
      },
      /**
       * Filters the delivered invoices.
       */
      delivered(query) {
        query.whereNot('delivered_at', null);
      },
      /**
       * Filters the unpaid invoices.
       */
      unpaid(query) {
        query.where(raw('PAYMENT_AMOUNT = 0'));
      },
      /**
       * Filters the overdue invoices.
       */
      overdue(query, asDate = moment().format('YYYY-MM-DD')) {
        query.where('due_date', '<', asDate);
      },
      /**
       * Filters the not overdue invoices.
       */
      notOverdue(query, asDate = moment().format('YYYY-MM-DD')) {
        query.where('due_date', '>=', asDate);
      },
      /**
       * Filters the partially invoices.
       */
      partiallyPaid(query) {
        query.whereNot('payment_amount', 0);
        query.whereNot(raw('`PAYMENT_AMOUNT` = `BALANCE`'));
      },
      /**
       * Filters the paid invoices.
       */
      paid(query) {
        query.where(raw('PAYMENT_AMOUNT = BALANCE'));
      },
      /**
       * Filters the sale invoices from the given date.
       */
      fromDate(query, fromDate) {
        query.where('invoice_date', '<=', fromDate);
      },
      /**
       * Sort the sale invoices by full-payment invoices.
       */
      sortByStatus(query, order) {
        query.orderByRaw(`PAYMENT_AMOUNT = BALANCE ${order}`);
      },
      /**
       * Sort the sale invoices by the due amount.
       */
      sortByDueAmount(query, order) {
        query.orderByRaw(`BALANCE - PAYMENT_AMOUNT ${order}`);
      },

      /**
       * Retrieve the max invoice
       */
      maxInvoiceNo(query, prefix, number) {
        query
          .select(raw(`REPLACE(INVOICE_NO, "${prefix}", "") AS INV_NUMBER`))
          .havingRaw('CHAR_LENGTH(INV_NUMBER) = ??', [number.length])
          .orderBy('invNumber', 'DESC')
          .limit(1)
          .first();
      },

      byPrefixAndNumber(query, prefix, number) {
        query.where('invoice_no', `${prefix}${number}`);
      },

      /**
       * Status filter.
       */
      statusFilter(query, filterType) {
        switch (filterType) {
          case 'draft':
            query.modify('draft');
            break;
          case 'delivered':
            query.modify('delivered');
            break;
          case 'unpaid':
            query.modify('unpaid');
            break;
          case 'overdue':
          default:
            query.modify('overdue');
            break;
          case 'partially-paid':
            query.modify('partiallyPaid');
            break;
          case 'paid':
            query.modify('paid');
            break;
        }
      },
    };
  }

  /**
   * Relationship mapping.
   */
  static get relationMappings() {
    const AccountTransaction = require('models/AccountTransaction');
    const ItemEntry = require('models/ItemEntry');
    const Customer = require('models/Customer');
    const InventoryCostLotTracker = require('models/InventoryCostLotTracker');
    const PaymentReceiveEntry = require('models/PaymentReceiveEntry');

    return {
      /**
       * Sale invoice associated entries.
       */
      entries: {
        relation: Model.HasManyRelation,
        modelClass: ItemEntry.default,
        join: {
          from: 'sales_invoices.id',
          to: 'items_entries.referenceId',
        },
        filter(builder) {
          builder.where('reference_type', 'SaleInvoice');
        },
      },

      /**
       * Belongs to customer model.
       */
      customer: {
        relation: Model.BelongsToOneRelation,
        modelClass: Customer.default,
        join: {
          from: 'sales_invoices.customerId',
          to: 'contacts.id',
        },
        filter(query) {
          query.where('contact_service', 'Customer');
        },
      },

      /**
       * Invoice has associated account transactions.
       */
      transactions: {
        relation: Model.HasManyRelation,
        modelClass: AccountTransaction.default,
        join: {
          from: 'sales_invoices.id',
          to: 'accounts_transactions.referenceId',
        },
        filter(builder) {
          builder.where('reference_type', 'SaleInvoice');
        },
      },

      costTransactions: {
        relation: Model.HasManyRelation,
        modelClass: InventoryCostLotTracker.default,
        join: {
          from: 'sales_invoices.id',
          to: 'inventory_cost_lot_tracker.transactionId',
        },
        filter(builder) {
          builder.where('transaction_type', 'SaleInvoice');
        },
      },

      paymentEntries: {
        relation: Model.HasManyRelation,
        modelClass: PaymentReceiveEntry.default,
        join: {
          from: 'sales_invoices.id',
          to: 'payment_receives_entries.invoice_id',
        },
      },
    };
  }

  /**
   * Change payment amount.
   * @param {Integer} invoiceId
   * @param {Numeric} amount
   */
  static async changePaymentAmount(invoiceId, amount) {
    const changeMethod = amount > 0 ? 'increment' : 'decrement';

    await this.query()
      .where('id', invoiceId)
      [changeMethod]('payment_amount', Math.abs(amount));
  }

  /**
   * Sale invoice meta.
   */
  static get meta() {
    return SaleInvoiceMeta;
  }

  static dueAmountFieldSortQuery(query, role) {
    query.modify('sortByDueAmount', role.order);
  }

  /**
   * Retrieve the default custom views, roles and columns.
   */
  static get defaultViews() {
    return DEFAULT_VIEWS;
  }

  /**
   * Model searchable.
   */
  static get searchable() {
    return true;
  }

  /**
   * Model search attributes.
   */
  static get searchRoles() {
    return [
      { fieldKey: 'invoice_no', comparator: 'contains' },
      { condition: 'or', fieldKey: 'reference_no', comparator: 'contains' },
      { condition: 'or', fieldKey: 'amount', comparator: 'equals' },
    ];
  }
}