import { t } from 'fyo';
import { DocValue } from 'fyo/core/types';
import { Doc } from 'fyo/model/doc';
import { FiltersMap, FormulaMap, ValidationMap } from 'fyo/model/types';
import { ValidationError } from 'fyo/utils/errors';
import { ModelNameEnum } from 'models/types';
import { Money } from 'pesa';
import { safeParseFloat } from 'utils/index';

export class StockTransferItem extends Doc {
  item?: string;
  location?: string;

  unit?: string;
  transferUnit?: string;
  quantity?: number;
  transferQuantity?: number;
  unitConversionFactor?: number;

  rate?: Money;
  amount?: Money;
  description?: string;
  hsnCode?: number;

  formulas: FormulaMap = {
    description: {
      formula: async () =>
        (await this.fyo.getValue(
          'Item',
          this.item as string,
          'description'
        )) as string,
      dependsOn: ['item'],
    },
    unit: {
      formula: async () =>
        (await this.fyo.getValue(
          'Item',
          this.item as string,
          'unit'
        )) as string,
      dependsOn: ['item'],
    },
    transferUnit: {
      formula: async () =>
        (await this.fyo.getValue(
          'Item',
          this.item as string,
          'unit'
        )) as string,
      dependsOn: ['item'],
    },
    transferQuantity: {
      formula: async () => {
        if (this.unit === this.transferUnit) {
          return this.quantity;
        }

        return this.transferQuantity;
      },
      dependsOn: ['item'],
    },
    quantity: {
      formula: async () => {
        if (!this.item) {
          return this.quantity as number;
        }

        const itemDoc = await this.fyo.doc.getDoc(
          ModelNameEnum.Item,
          this.item as string
        );
        const unitDoc = itemDoc.getLink('uom');
        if (unitDoc?.isWhole) {
          return Math.round(
            this.transferQuantity! * this.unitConversionFactor!
          );
        }

        return safeParseFloat(
          this.transferQuantity! * this.unitConversionFactor!
        );
      },
      dependsOn: ['quantity', 'transferQuantity', 'unitConversionFactor'],
    },
    unitConversionFactor: {
      formula: async () => {
        if (this.unit === this.transferUnit) {
          return 1;
        }

        const conversionFactor = await this.fyo.db.getAll(
          ModelNameEnum.UOMConversionItem,
          {
            fields: ['conversionFactor'],
            filters: { parent: this.item! },
          }
        );

        return safeParseFloat(conversionFactor[0]?.conversionFactor ?? 1);
      },
      dependsOn: ['transferUnit'],
    },
    hsnCode: {
      formula: async () =>
        (await this.fyo.getValue(
          'Item',
          this.item as string,
          'hsnCode'
        )) as string,
      dependsOn: ['item'],
    },
    amount: {
      formula: () => {
        return this.rate?.mul(this.quantity ?? 0) ?? this.fyo.pesa(0);
      },
      dependsOn: ['rate', 'quantity'],
    },
    rate: {
      formula: async (fieldname) => {
        const rate = (await this.fyo.getValue(
          'Item',
          this.item as string,
          'rate'
        )) as undefined | Money;

        if (!rate?.float && this.rate?.float) {
          return this.rate;
        }

        return rate ?? this.fyo.pesa(0);
      },
      dependsOn: ['item'],
    },
    account: {
      formula: () => {
        let accountType = 'expenseAccount';
        if (this.isSales) {
          accountType = 'incomeAccount';
        }
        return this.fyo.getValue('Item', this.item as string, accountType);
      },
      dependsOn: ['item'],
    },
    location: {
      formula: () => {
        if (this.location) {
          return;
        }

        const defaultLocation = this.fyo.singles.InventorySettings
          ?.defaultLocation as string | undefined;

        if (defaultLocation && !this.location) {
          return defaultLocation;
        }
      },
    },
  };

  validations: ValidationMap = {
    transferUnit: async (value: DocValue) => {
      if (!this.item) {
        return;
      }

      const item = await this.fyo.db.getAll(ModelNameEnum.UOMConversionItem, {
        fields: ['parent'],
        filters: { uom: value as string, parent: this.item! },
      });

      if (item.length < 1)
        throw new ValidationError(
          t`Transfer Unit ${value as string} is not applicable for Item ${this
            .item!}`
        );
    },
  };

  static filters: FiltersMap = {
    item: (doc: Doc) => {
      let itemNotFor = 'Sales';
      if (doc.isSales) {
        itemNotFor = 'Purchases';
      }

      return { for: ['not in', [itemNotFor]], trackItem: true };
    },
  };
}