Merge pull request #829 from akshayitzme/pricing-rule

feat: Pricing Rule

models/baseModels/AccountingSettings/AccountingSettings.ts

@@ -18,6 +18,7 @@ export class AccountingSettings extends Doc {
   enableLead?: boolean;
   enableFormCustomization?: boolean;
   enableInvoiceReturns?: boolean;
+  enablePricingRule?: boolean;
 
   static filters: FiltersMap = {
     writeOffAccount: () => ({
@@ -60,6 +61,8 @@ export class AccountingSettings extends Doc {
   override hidden: HiddenMap = {
     discountAccount: () => !this.enableDiscounting,
     gstin: () => this.fyo.singles.SystemSettings?.countryCode !== 'in',
+    enablePricingRule: () =>
+      !this.fyo.singles.AccountingSettings?.enableDiscounting,
   };
 
   async change(ch: ChangeArg) {

models/baseModels/Invoice/Invoice.ts

@@ -11,7 +11,15 @@ import {
 import { DEFAULT_CURRENCY } from 'fyo/utils/consts';
 import { ValidationError } from 'fyo/utils/errors';
 import { Transactional } from 'models/Transactional/Transactional';
-import { addItem, getExchangeRate, getNumberSeries } from 'models/helpers';
+import {
+  addItem,
+  canApplyPricingRule,
+  filterPricingRules,
+  getExchangeRate,
+  getNumberSeries,
+  getPricingRulesConflicts,
+  roundFreeItemQty,
+} from 'models/helpers';
 import { StockTransfer } from 'models/inventory/StockTransfer';
 import { validateBatch } from 'models/inventory/helpers';
 import { ModelNameEnum } from 'models/types';
@@ -27,6 +35,9 @@ import { Tax } from '../Tax/Tax';
 import { TaxSummary } from '../TaxSummary/TaxSummary';
 import { ReturnDocItem } from 'models/inventory/types';
 import { AccountFieldEnum, PaymentTypeEnum } from '../Payment/types';
+import { PricingRule } from '../PricingRule/PricingRule';
+import { ApplicablePricingRules } from './types';
+import { PricingRuleDetail } from '../PricingRuleDetail/PricingRuleDetail';
 
 export type TaxDetail = {
   account: string;
@@ -70,6 +81,8 @@ export abstract class Invoice extends Transactional {
   isReturned?: boolean;
   returnAgainst?: string;
 
+  pricingRuleDetail?: PricingRuleDetail[];
+
   get isSales() {
     return (
       this.schemaName === 'SalesInvoice' || this.schemaName == 'SalesQuote'
@@ -160,6 +173,7 @@ export abstract class Invoice extends Transactional {
       throw new ValidationError(this.fyo.t`Discount Account is not set.`);
     }
     await validateBatch(this);
+    await this._validatePricingRule();
   }
 
   async afterSubmit() {
@@ -625,6 +639,22 @@ export abstract class Invoice extends Transactional {
         !!this.autoStockTransferLocation,
       dependsOn: [],
     },
+    isPricingRuleApplied: {
+      formula: async () => {
+        if (!this.fyo.singles.AccountingSettings?.enablePricingRule) {
+          return false;
+        }
+
+        const pricingRule = await this.getPricingRule();
+        if (!pricingRule) {
+          return false;
+        }
+
+        await this.appendPricingRuleDetail(pricingRule);
+        return !!pricingRule;
+      },
+      dependsOn: ['items'],
+    },
   };
 
   getStockTransferred() {
@@ -701,6 +731,9 @@ export abstract class Invoice extends Transactional {
       (!this.canEdit && !this.priceList),
     returnAgainst: () =>
       (this.isSubmitted || this.isCancelled) && !this.returnAgainst,
+    pricingRuleDetail: () =>
+      !this.fyo.singles.AccountingSettings?.enablePricingRule ||
+      !this.pricingRuleDetail?.length,
   };
 
   static defaults: DefaultMap = {
@@ -917,6 +950,16 @@ export abstract class Invoice extends Transactional {
     return transfer;
   }
 
+  async beforeSync(): Promise<void> {
+    await super.beforeSync();
+
+    if (this.pricingRuleDetail?.length) {
+      await this.applyProductDiscount();
+    } else {
+      this.clearFreeItems();
+    }
+  }
+
   async beforeCancel(): Promise<void> {
     await super.beforeCancel();
     await this._validateStockTransferCancelled();
@@ -1045,4 +1088,174 @@ export abstract class Invoice extends Transactional {
   async addItem(name: string) {
     return await addItem(name, this);
   }
+
+  async appendPricingRuleDetail(
+    applicablePricingRule: ApplicablePricingRules[]
+  ) {
+    await this.set('pricingRuleDetail', null);
+
+    for (const doc of applicablePricingRule) {
+      await this.append('pricingRuleDetail', {
+        referenceName: doc.pricingRule.name,
+        referenceItem: doc.applyOnItem,
+      });
+    }
+  }
+
+  clearFreeItems() {
+    if (this.pricingRuleDetail?.length || !this.items) {
+      return;
+    }
+
+    for (const item of this.items) {
+      if (item.isFreeItem) {
+        this.items = this.items?.filter(
+          (invoiceItem) => invoiceItem.name !== item.name
+        );
+      }
+    }
+  }
+
+  async applyProductDiscount() {
+    if (!this.items) {
+      return;
+    }
+
+    if (!this.pricingRuleDetail?.length || !this.pricingRuleDetail.length) {
+      return;
+    }
+
+    this.items = this.items.filter((item) => !item.isFreeItem);
+
+    for (const item of this.items) {
+      const pricingRuleDetailForItem = this.pricingRuleDetail.filter(
+        (doc) => doc.referenceItem === item.item
+      );
+
+      if (!pricingRuleDetailForItem.length) {
+        return;
+      }
+
+      const pricingRuleDoc = (await this.fyo.doc.getDoc(
+        ModelNameEnum.PricingRule,
+        pricingRuleDetailForItem[0].referenceName
+      )) as PricingRule;
+
+      if (pricingRuleDoc.discountType === 'Price Discount') {
+        continue;
+      }
+
+      const appliedItems = pricingRuleDoc.appliedItems?.map((doc) => doc.item);
+      if (!appliedItems?.includes(item.item)) {
+        continue;
+      }
+
+      const canApplyPRLOnItem = canApplyPricingRule(
+        pricingRuleDoc,
+        this.date as Date,
+        item.quantity as number,
+        item.amount as Money
+      );
+
+      if (!canApplyPRLOnItem) {
+        continue;
+      }
+
+      let freeItemQty = pricingRuleDoc.freeItemQuantity as number;
+
+      if (pricingRuleDoc.isRecursive) {
+        freeItemQty =
+          (item.quantity as number) / (pricingRuleDoc.recurseEvery as number);
+      }
+
+      if (pricingRuleDoc.roundFreeItemQty) {
+        freeItemQty = roundFreeItemQty(
+          freeItemQty,
+          pricingRuleDoc.roundingMethod as 'round' | 'floor' | 'ceil'
+        );
+      }
+
+      await this.append('items', {
+        item: pricingRuleDoc.freeItem as string,
+        quantity: freeItemQty,
+        isFreeItem: true,
+        rate: pricingRuleDoc.freeItemRate,
+        unit: pricingRuleDoc.freeItemUnit,
+      });
+    }
+  }
+
+  async getPricingRule(): Promise<ApplicablePricingRules[] | undefined> {
+    if (!this.isSales || !this.items) {
+      return;
+    }
+    const pricingRules: ApplicablePricingRules[] = [];
+
+    for (const item of this.items) {
+      if (item.isFreeItem) {
+        continue;
+      }
+
+      const pricingRuleDocNames = (
+        await this.fyo.db.getAll(ModelNameEnum.PricingRuleItem, {
+          fields: ['parent'],
+          filters: {
+            item: item.item as string,
+            unit: item.unit as string,
+          },
+        })
+      ).map((doc) => doc.parent) as string[];
+
+      const pricingRuleDocsForItem = (await this.fyo.db.getAll(
+        ModelNameEnum.PricingRule,
+        {
+          fields: ['*'],
+          filters: {
+            name: ['in', pricingRuleDocNames],
+            isEnabled: true,
+          },
+          orderBy: 'priority',
+          order: 'desc',
+        }
+      )) as PricingRule[];
+
+      const filtered = filterPricingRules(
+        pricingRuleDocsForItem,
+        this.date as Date,
+        item.quantity as number,
+        item.amount as Money
+      );
+
+      if (!filtered.length) {
+        continue;
+      }
+
+      const isPricingRuleHasConflicts = getPricingRulesConflicts(
+        filtered,
+        item.item as string
+      );
+
+      if (isPricingRuleHasConflicts) {
+        continue;
+      }
+
+      pricingRules.push({
+        applyOnItem: item.item as string,
+        pricingRule: filtered[0],
+      });
+    }
+
+    return pricingRules;
+  }
+
+  async _validatePricingRule() {
+    if (!this.fyo.singles.AccountingSettings?.enablePricingRule) {
+      return;
+    }
+
+    if (!this.items) {
+      return;
+    }
+    await this.getPricingRule();
+  }
 }

models/baseModels/Invoice/types.ts

@@ -0,0 +1,6 @@
+import { PricingRule } from '../PricingRule/PricingRule';
+
+export interface ApplicablePricingRules {
+  applyOnItem: string;
+  pricingRule: PricingRule;
+}

models/baseModels/InvoiceItem/InvoiceItem.ts

@@ -19,6 +19,7 @@ import { Item } from '../Item/Item';
 import { StockTransfer } from 'models/inventory/StockTransfer';
 import { PriceList } from '../PriceList/PriceList';
 import { isPesa } from 'fyo/utils';
+import { PricingRule } from '../PricingRule/PricingRule';
 
 export abstract class InvoiceItem extends Doc {
   item?: string;
@@ -46,6 +47,8 @@ export abstract class InvoiceItem extends Doc {
   itemDiscountedTotal?: Money;
   itemTaxedTotal?: Money;
 
+  isFreeItem?: boolean;
+
   get isSales() {
     return (
       this.schemaName === 'SalesInvoiceItem' ||
@@ -93,6 +96,10 @@ export abstract class InvoiceItem extends Doc {
     return !!this.parentdoc?.isReturn;
   }
 
+  get pricingRuleDetail() {
+    return this.parentdoc?.pricingRuleDetail;
+  }
+
   constructor(schema: Schema, data: DocValueMap, fyo: Fyo) {
     super(schema, data, fyo);
     this._setGetCurrencies();
@@ -169,6 +176,7 @@ export abstract class InvoiceItem extends Doc {
         'itemTaxedTotal',
         'itemDiscountedTotal',
         'setItemDiscountAmount',
+        'pricingRuleDetail',
       ],
     },
     unit: {
@@ -404,6 +412,80 @@ export abstract class InvoiceItem extends Doc {
       },
       dependsOn: ['item', 'quantity'],
     },
+    setItemDiscountAmount: {
+      formula: async () => {
+        if (
+          !this.fyo.singles.AccountingSettings?.enablePricingRule ||
+          !this.parentdoc?.pricingRuleDetail
+        ) {
+          return this.setItemDiscountAmount;
+        }
+
+        const pricingRule = this.parentdoc?.pricingRuleDetail?.filter(
+          (prDetail) => prDetail.referenceItem === this.item
+        );
+
+        if (!pricingRule) {
+          return this.setItemDiscountAmount;
+        }
+
+        const pricingRuleDoc = (await this.fyo.doc.getDoc(
+          ModelNameEnum.PricingRule,
+          pricingRule[0].referenceName
+        )) as PricingRule;
+
+        if (pricingRuleDoc.discountType === 'Product Discount') {
+          return this.setItemDiscountAmount;
+        }
+
+        if (pricingRuleDoc.priceDiscountType === 'amount') {
+          const discountAmount = pricingRuleDoc.discountAmount?.mul(
+            this.quantity as number
+          );
+          await this.set('itemDiscountAmount', discountAmount);
+          return true;
+        }
+
+        return this.setItemDiscountAmount;
+      },
+      dependsOn: ['pricingRuleDetail'],
+    },
+    itemDiscountPercent: {
+      formula: async () => {
+        if (
+          !this.fyo.singles.AccountingSettings?.enablePricingRule ||
+          !this.parentdoc?.pricingRuleDetail
+        ) {
+          return this.itemDiscountPercent;
+        }
+
+        const pricingRule = this.parentdoc?.pricingRuleDetail?.filter(
+          (prDetail) => prDetail.referenceItem === this.item
+        );
+
+        if (!pricingRule) {
+          return this.itemDiscountPercent;
+        }
+
+        const pricingRuleDoc = (await this.fyo.doc.getDoc(
+          ModelNameEnum.PricingRule,
+          pricingRule[0].referenceName
+        )) as PricingRule;
+
+        if (pricingRuleDoc.discountType === 'Product Discount') {
+          return this.itemDiscountPercent;
+        }
+
+        if (pricingRuleDoc.priceDiscountType === 'percentage') {
+          await this.set('setItemDiscountAmount', false);
+
+          return pricingRuleDoc.discountPercentage;
+        }
+
+        return this.itemDiscountPercent;
+      },
+      dependsOn: ['pricingRuleDetail'],
+    },
   };
 
   validations: ValidationMap = {
@@ -531,7 +613,21 @@ export abstract class InvoiceItem extends Doc {
 }
 
 async function getItemRate(doc: InvoiceItem): Promise<Money | undefined> {
+  if (doc.isFreeItem) {
+    return doc.rate;
+  }
+
+  let pricingRuleRate: Money | undefined;
+  if (doc.fyo.singles.AccountingSettings?.enablePricingRule) {
+    pricingRuleRate = await getItemRateFromPricingRule(doc);
+  }
+
+  if (pricingRuleRate) {
+    return pricingRuleRate;
+  }
+
   let priceListRate: Money | undefined;
+
   if (doc.fyo.singles.AccountingSettings?.enablePriceList) {
     priceListRate = await getItemRateFromPriceList(doc);
   }
@@ -552,6 +648,33 @@ async function getItemRate(doc: InvoiceItem): Promise<Money | undefined> {
   return;
 }
 
+async function getItemRateFromPricingRule(
+  doc: InvoiceItem
+): Promise<Money | undefined> {
+  const pricingRule = doc.parentdoc?.pricingRuleDetail?.filter(
+    (prDetail) => prDetail.referenceItem === doc.item
+  );
+
+  if (!pricingRule) {
+    return;
+  }
+
+  const pricingRuleDoc = (await doc.fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    pricingRule[0].referenceName
+  )) as PricingRule;
+
+  if (pricingRuleDoc.discountType !== 'Price Discount') {
+    return;
+  }
+
+  if (pricingRuleDoc.priceDiscountType !== 'rate') {
+    return;
+  }
+
+  return pricingRuleDoc.discountRate;
+}
+
 async function getItemRateFromPriceList(
   doc: InvoiceItem
 ): Promise<Money | undefined> {

models/baseModels/PriceList/PriceList.ts

@@ -2,7 +2,7 @@ import { Doc } from 'fyo/model/doc';
 import { ListViewSettings } from 'fyo/model/types';
 import { PriceListItem } from './PriceListItem';
 import {
-  getPriceListEnabledColumn,
+  getIsDocEnabledColumn,
   getPriceListStatusColumn,
 } from 'models/helpers';
 
@@ -14,11 +14,7 @@ export class PriceList extends Doc {
 
   static getListViewSettings(): ListViewSettings {
     return {
-      columns: [
+      columns: ['name', getIsDocEnabledColumn(), getPriceListStatusColumn()],
-        'name',
-        getPriceListEnabledColumn(),
-        getPriceListStatusColumn(),
-      ],
     };
   }
 }

models/baseModels/PricingRule/PricingRule.ts

@@ -0,0 +1,166 @@
+import { Doc } from 'fyo/model/doc';
+import { Money } from 'pesa';
+import { PricingRuleItem } from '../PricingRuleItem/PricingRuleItem';
+import { getIsDocEnabledColumn } from 'models/helpers';
+import {
+  HiddenMap,
+  ListViewSettings,
+  RequiredMap,
+  ValidationMap,
+} from 'fyo/model/types';
+import { DocValue } from 'fyo/core/types';
+import { ValidationError } from 'fyo/utils/errors';
+import { t } from 'fyo';
+
+export class PricingRule extends Doc {
+  isEnabled?: boolean;
+  title?: string;
+  appliedItems?: PricingRuleItem[];
+  discountType?: 'Price Discount' | 'Product Discount';
+
+  priceDiscountType?: 'rate' | 'percentage' | 'amount';
+  discountRate?: Money;
+  discountPercentage?: number;
+  discountAmount?: Money;
+
+  forPriceList?: string;
+
+  freeItem?: string;
+  freeItemQuantity?: number;
+  freeItemUnit?: string;
+  freeItemRate?: Money;
+  roundFreeItemQty?: number;
+  roundingMethod?: string;
+
+  isRecursive?: boolean;
+  recurseEvery?: number;
+  recurseOver?: number;
+
+  minQuantity?: number;
+  maxQuantity?: number;
+
+  minAmount?: Money;
+  maxAmount?: Money;
+
+  validFrom?: Date;
+  validTo?: Date;
+
+  thresholdForSuggestion?: number;
+  priority?: number;
+
+  get isDiscountTypeIsPriceDiscount() {
+    return this.discountType === 'Price Discount';
+  }
+
+  validations: ValidationMap = {
+    minQuantity: (value: DocValue) => {
+      if (!value || !this.maxQuantity) {
+        return;
+      }
+
+      if ((value as number) > this.maxQuantity) {
+        throw new ValidationError(
+          t`Minimum Quantity should be less than the Maximum Quantity.`
+        );
+      }
+    },
+    maxQuantity: (value: DocValue) => {
+      if (!this.minQuantity || !value) {
+        return;
+      }
+
+      if ((value as number) < this.minQuantity) {
+        throw new ValidationError(
+          t`Maximum Quantity should be greater than the Minimum Quantity.`
+        );
+      }
+    },
+    minAmount: (value: DocValue) => {
+      if (!value || !this.maxAmount) {
+        return;
+      }
+
+      if ((value as Money).isZero() && this.maxAmount.isZero()) {
+        return;
+      }
+
+      if ((value as Money).gte(this.maxAmount)) {
+        throw new ValidationError(
+          t`Minimum Amount should be less than the Maximum Amount.`
+        );
+      }
+    },
+    maxAmount: (value: DocValue) => {
+      if (!this.minAmount || !value) {
+        return;
+      }
+
+      if (this.minAmount.isZero() && (value as Money).isZero()) {
+        return;
+      }
+
+      if ((value as Money).lte(this.minAmount)) {
+        throw new ValidationError(
+          t`Maximum Amount should be greater than the Minimum Amount.`
+        );
+      }
+    },
+    validFrom: (value: DocValue) => {
+      if (!value || !this.validTo) {
+        return;
+      }
+      if ((value as Date).toISOString() > this.validTo.toISOString()) {
+        throw new ValidationError(
+          t`Valid From Date should be less than Valid To Date.`
+        );
+      }
+    },
+    validTo: (value: DocValue) => {
+      if (!this.validFrom || !value) {
+        return;
+      }
+      if ((value as Date).toISOString() < this.validFrom.toISOString()) {
+        throw new ValidationError(
+          t`Valid To Date should be greater than Valid From Date.`
+        );
+      }
+    },
+  };
+
+  required: RequiredMap = {
+    priceDiscountType: () => this.isDiscountTypeIsPriceDiscount,
+  };
+
+  static getListViewSettings(): ListViewSettings {
+    return {
+      columns: ['name', 'title', getIsDocEnabledColumn(), 'discountType'],
+    };
+  }
+
+  hidden: HiddenMap = {
+    location: () => !this.fyo.singles.AccountingSettings?.enableInventory,
+
+    priceDiscountType: () => !this.isDiscountTypeIsPriceDiscount,
+    discountRate: () =>
+      !this.isDiscountTypeIsPriceDiscount || this.priceDiscountType !== 'rate',
+    discountPercentage: () =>
+      !this.isDiscountTypeIsPriceDiscount ||
+      this.priceDiscountType !== 'percentage',
+    discountAmount: () =>
+      !this.isDiscountTypeIsPriceDiscount ||
+      this.priceDiscountType !== 'amount',
+    forPriceList: () =>
+      !this.isDiscountTypeIsPriceDiscount || this.priceDiscountType === 'rate',
+
+    freeItem: () => this.isDiscountTypeIsPriceDiscount,
+    freeItemQuantity: () => this.isDiscountTypeIsPriceDiscount,
+    freeItemUnit: () => this.isDiscountTypeIsPriceDiscount,
+    freeItemRate: () => this.isDiscountTypeIsPriceDiscount,
+    roundFreeItemQty: () => this.isDiscountTypeIsPriceDiscount,
+    roundingMethod: () =>
+      this.isDiscountTypeIsPriceDiscount || !this.roundFreeItemQty,
+    isRecursive: () => this.isDiscountTypeIsPriceDiscount,
+    recurseEvery: () => this.isDiscountTypeIsPriceDiscount || !this.isRecursive,
+    recurseOver: () => this.isDiscountTypeIsPriceDiscount || !this.isRecursive,
+  };
+}

models/baseModels/PricingRuleDetail/PricingRuleDetail.ts

@@ -0,0 +1,6 @@
+import { Doc } from 'fyo/model/doc';
+
+export class PricingRuleDetail extends Doc {
+  referenceName?: string;
+  referenceItem?: string;
+}

models/baseModels/PricingRuleItem/PricingRuleItem.ts

@@ -0,0 +1,19 @@
+import { Doc } from 'fyo/model/doc';
+import { FormulaMap } from 'fyo/model/types';
+import { ModelNameEnum } from 'models/types';
+
+export class PricingRuleItem extends Doc {
+  item?: string;
+  unit?: string;
+
+  formulas: FormulaMap = {
+    unit: {
+      formula: () => {
+        if (!this.item) {
+          return;
+        }
+        return this.fyo.getValue(ModelNameEnum.Item, this.item, 'unit');
+      },
+    },
+  };
+}

models/baseModels/tests/testPricingRule.spec.ts

@@ -0,0 +1,556 @@
+import test from 'tape';
+import { closeTestFyo, getTestFyo, setupTestFyo } from 'tests/helpers';
+import { ModelNameEnum } from 'models/types';
+import { SalesInvoice } from '../SalesInvoice/SalesInvoice';
+import {
+  assertDoesNotThrow,
+  assertThrows,
+} from 'backend/database/tests/helpers';
+import { getItem } from 'models/inventory/tests/helpers';
+import { PricingRule } from '../PricingRule/PricingRule';
+
+const fyo = getTestFyo();
+setupTestFyo(fyo, __filename);
+
+const itemMap = {
+  Jacket: {
+    name: 'Jacket',
+    rate: 1000,
+    unit: 'Unit',
+  },
+  Cap: {
+    name: 'Cap',
+    rate: 100,
+    unit: 'Unit',
+  },
+};
+
+const partyMap = {
+  partyOne: {
+    name: 'Daisy',
+    email: 'daisy@alien.com',
+  },
+};
+
+const pricingRuleMap = [
+  {
+    name: 'PRLE-1001',
+    isEnabled: false,
+    title: 'JKT PDR Offer',
+    appliedItems: [{ item: itemMap.Jacket.name }],
+    discountType: 'Price Discount',
+    priceDiscountType: 'rate',
+    discountRate: 800,
+    minQuantity: 4,
+    maxQuantity: 6,
+    minAmount: fyo.pesa(4000),
+    maxAmount: fyo.pesa(6000),
+    priority: '1',
+  },
+  {
+    name: 'PRLE-1002',
+    title: 'CAP PDR Offer',
+    appliedItems: [{ item: itemMap.Cap.name }],
+    discountType: 'Product Discount',
+    freeItem: 'Cap',
+    freeItemQuantity: 1,
+    freeItemUnit: 'Unit',
+    freeItemRate: 0,
+    minQuantity: 4,
+    maxQuantity: 6,
+    minAmount: 200,
+    maxAmount: 1000,
+    validFrom: '2024-02-01',
+    validTo: '2024-02-29',
+    priority: '1',
+  },
+];
+
+test('Pricing Rule: create dummy item, party, pricing rules', async (t) => {
+  // Create Items
+  for (const { name, rate } of Object.values(itemMap)) {
+    const item = getItem(name, rate, false);
+    await fyo.doc.getNewDoc(ModelNameEnum.Item, item).sync();
+    t.ok(await fyo.db.exists(ModelNameEnum.Item, name), `Item: ${name} exists`);
+  }
+
+  // Create Party
+  await fyo.doc.getNewDoc(ModelNameEnum.Party, partyMap.partyOne).sync();
+  t.ok(
+    await fyo.db.exists(ModelNameEnum.Party, partyMap.partyOne.name),
+    `Party: ${partyMap.partyOne.name} exists`
+  );
+
+  // Create Pricing Rules
+  for (const pricingRule of Object.values(pricingRuleMap)) {
+    await fyo.doc.getNewDoc(ModelNameEnum.PricingRule, pricingRule).sync();
+
+    t.ok(
+      await fyo.db.exists(ModelNameEnum.PricingRule, pricingRule.name),
+      `Price List: ${pricingRule.name} exists`
+    );
+  }
+
+  await fyo.singles.AccountingSettings?.set('enablePricingRule', true);
+  t.ok(fyo.singles.AccountingSettings?.enablePricingRule);
+});
+
+test('disabled pricing rule is not applied', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', { item: itemMap.Jacket.name, quantity: 5 });
+  await sinv.runFormulas();
+
+  t.equal(sinv.pricingRuleDetail?.length, undefined);
+});
+
+test('pricing rule is applied when filtered by min and max qty', async (t) => {
+  const pruleDoc = (await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    pricingRuleMap[0].name
+  )) as PricingRule;
+
+  await pruleDoc.set('isEnabled', true);
+  await pruleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 5,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail![0].referenceName,
+    pricingRuleMap[0].name,
+    'Pricing Rule is added to Pricing Rule Detail'
+  );
+
+  t.equal(
+    sinv.items![0].rate!.float,
+    pricingRuleMap[0].discountRate,
+    'item rate fetched from Pricing Rule'
+  );
+});
+
+test('pricing rule is not applied when item qty is < min  qty', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', { item: itemMap.Jacket.name, quantity: 3 });
+  await sinv.runFormulas();
+
+  t.equal(sinv.pricingRuleDetail?.length, undefined);
+});
+
+test('pricing rule is not applied when item qty is > max  qty', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', { item: itemMap.Jacket.name, quantity: 10 });
+  await sinv.runFormulas();
+
+  t.equal(sinv.pricingRuleDetail?.length, undefined);
+});
+
+test('pricing rule is applied when filtered by min and max amount', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 5,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail![0].referenceName,
+    pricingRuleMap[0].name,
+    'Pricing Rule is added to Pricing Rule Detail'
+  );
+
+  t.equal(
+    sinv.items![0].rate!.float,
+    pricingRuleMap[0].discountRate,
+    'item rate fetched from Pricing Rule'
+  );
+});
+
+test('Pricing Rule is not applied when item amount is < min  amount', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 2,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is not applied when item amount is > max amount', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: new Date(),
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 7,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is not applied when sinvDate < validFrom date', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-01-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is not applied when sinvDate > validFrom date', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-03-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is applied when filtered by qty, amount and dates', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail![0].referenceName,
+    pricingRuleMap[1].name,
+    'Pricing Rule is applied'
+  );
+});
+
+test('Pricing Rule is applied when filtered by qty, amount and dates', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail![0].referenceName,
+    pricingRuleMap[1].name,
+    'Pricing Rule is applied'
+  );
+});
+
+test('Pricing Rule is not applied when qty condition is false, rest is true', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 7,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is not applied when amount condition is false, rest is true', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: fyo.pesa(250),
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('Pricing Rule is not applied when validity condition is false, rest is true', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-03-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail?.length,
+    undefined,
+    'Pricing Rule is not applied'
+  );
+});
+
+test('create two pricing rules, Highest priority pricing rule is applied', async (t) => {
+  const newPricingRuleDoc = fyo.doc.getNewDoc(ModelNameEnum.PricingRule, {
+    ...pricingRuleMap[1],
+    priority: '2',
+    appliedItems: [{ item: itemMap.Cap.name }],
+  });
+
+  await newPricingRuleDoc.runFormulas();
+  await newPricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(
+    sinv.pricingRuleDetail![0].referenceName,
+    'PRLE-1003',
+    'Pricing Rule with highest priority is applied'
+  );
+});
+
+test('Pricing Rule is not applied due to two docs having same priority', async (t) => {
+  const pricingRuleDoc = await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    'PRLE-1003'
+  );
+
+  await pricingRuleDoc.set('priority', '1');
+  await pricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(!!sinv.pricingRuleDetail?.length, false);
+});
+
+test('create a price discount of type rate, discounted rate should apply', async (t) => {
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 5,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(sinv.items![0].rate?.float, pricingRuleMap[0].discountRate);
+});
+
+test('create a price discount of type percent, discount percent should apply', async (t) => {
+  const pricingRuleDoc = await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    pricingRuleMap[0].name
+  );
+
+  await pricingRuleDoc.setMultiple({
+    priceDiscountType: 'percentage',
+    discountPercentage: 69,
+  });
+
+  await pricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 5,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(sinv.items![0].itemDiscountPercent, 69);
+});
+
+test('create a price discount of type amount, discount amount should apply', async (t) => {
+  const pricingRuleDoc = await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    pricingRuleMap[0].name
+  );
+
+  await pricingRuleDoc.setMultiple({
+    priceDiscountType: 'amount',
+    discountAmount: 500,
+  });
+
+  await pricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Jacket.name,
+    quantity: 5,
+    rate: itemMap.Jacket.rate,
+  });
+  await sinv.runFormulas();
+
+  t.equal(sinv.items![0].itemDiscountAmount!.float, 2500);
+});
+
+test('create a product discount giving 1 free item', async (t) => {
+  const pricingRuleDoc = await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    'PRLE-1003'
+  );
+
+  await pricingRuleDoc.set('isEnabled', false);
+  await pricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    account: 'Debtors',
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+  await sinv.sync();
+
+  t.equal(!!sinv.items![1].isFreeItem, true);
+  t.equal(sinv.items![1].rate!.float, pricingRuleMap[1].freeItemRate);
+  t.equal(sinv.items![1].quantity, pricingRuleMap[1].freeItemQuantity);
+});
+
+test('create a product discount, recurse 2', async (t) => {
+  const pricingRuleDoc = await fyo.doc.getDoc(
+    ModelNameEnum.PricingRule,
+    'PRLE-1003'
+  );
+
+  await pricingRuleDoc.set('isRecursive', true);
+  await pricingRuleDoc.set('recurseEvery', 2);
+  await pricingRuleDoc.sync();
+
+  const sinv = fyo.doc.getNewDoc(ModelNameEnum.SalesInvoice, {
+    account: 'Debtors',
+    date: '2024-02-01',
+    party: partyMap.partyOne.name,
+  }) as SalesInvoice;
+
+  await sinv.append('items', {
+    item: itemMap.Cap.name,
+    quantity: 5,
+    rate: itemMap.Cap.rate,
+  });
+  await sinv.runFormulas();
+  await sinv.sync();
+
+  t.equal(!!sinv.items![1].isFreeItem, true);
+  t.equal(sinv.items![1].rate!.float, pricingRuleMap[1].freeItemRate);
+  t.equal(sinv.items![1].quantity, pricingRuleMap[1].freeItemQuantity);
+});
+
+closeTestFyo(fyo, __filename);

models/helpers.ts

@@ -22,6 +22,9 @@ import { StockMovement } from './inventory/StockMovement';
 import { StockTransfer } from './inventory/StockTransfer';
 import { InvoiceStatus, ModelNameEnum } from './types';
 import { Lead } from './baseModels/Lead/Lead';
+import { PricingRule } from './baseModels/PricingRule/PricingRule';
+import { ValidationError } from 'fyo/utils/errors';
+import { ApplicablePricingRules } from './baseModels/Invoice/types';
 
 export function getQuoteActions(
   fyo: Fyo,
@@ -517,7 +520,7 @@ export function getPriceListStatusColumn(): ColumnConfig {
   };
 }
 
-export function getPriceListEnabledColumn(): ColumnConfig {
+export function getIsDocEnabledColumn(): ColumnConfig {
   return {
     label: t`Enabled`,
     fieldname: 'enabled',
@@ -657,3 +660,183 @@ export async function addItem<M extends ModelsWithItems>(name: string, doc: M) {
 
   await item.set('item', name);
 }
+
+export async function getPricingRule(
+  doc: Invoice
+): Promise<ApplicablePricingRules[] | null> {
+  if (
+    !doc.fyo.singles.AccountingSettings?.enablePricingRule ||
+    !doc.isSales ||
+    !doc.items
+  ) {
+    return null;
+  }
+
+  const pricingRules: ApplicablePricingRules[] = [];
+
+  for (const item of doc.items) {
+    if (item.isFreeItem) {
+      continue;
+    }
+
+    const pricingRuleDocNames = (
+      await doc.fyo.db.getAll(ModelNameEnum.PricingRuleItem, {
+        fields: ['parent'],
+        filters: {
+          item: item.item as string,
+          unit: item.unit as string,
+        },
+      })
+    ).map((doc) => doc.parent) as string[];
+
+    const pricingRuleDocsForItem = (await doc.fyo.db.getAll(
+      ModelNameEnum.PricingRule,
+      {
+        fields: ['*'],
+        filters: {
+          name: ['in', pricingRuleDocNames],
+          isEnabled: true,
+        },
+        orderBy: 'priority',
+        order: 'desc',
+      }
+    )) as PricingRule[];
+
+    const filtered = filterPricingRules(
+      pricingRuleDocsForItem,
+      doc.date as Date,
+      item.quantity as number,
+      item.amount as Money
+    );
+
+    if (!filtered.length) {
+      continue;
+    }
+
+    const isPricingRuleHasConflicts = getPricingRulesConflicts(
+      filtered,
+      item.item as string
+    );
+
+    if (isPricingRuleHasConflicts) {
+      continue;
+    }
+
+    pricingRules.push({
+      applyOnItem: item.item as string,
+      pricingRule: filtered[0],
+    });
+  }
+
+  return pricingRules;
+}
+
+export function filterPricingRules(
+  pricingRuleDocsForItem: PricingRule[],
+  sinvDate: Date,
+  quantity: number,
+  amount: Money
+): PricingRule[] | [] {
+  const filteredPricingRules: PricingRule[] | undefined = [];
+
+  for (const pricingRuleDoc of pricingRuleDocsForItem) {
+    if (canApplyPricingRule(pricingRuleDoc, sinvDate, quantity, amount)) {
+      filteredPricingRules.push(pricingRuleDoc);
+    }
+  }
+  return filteredPricingRules;
+}
+
+export function canApplyPricingRule(
+  pricingRuleDoc: PricingRule,
+  sinvDate: Date,
+  quantity: number,
+  amount: Money
+): boolean {
+  // Filter by Quantity
+  if (
+    (pricingRuleDoc.minQuantity as number) > 0 &&
+    quantity < (pricingRuleDoc.minQuantity as number)
+  ) {
+    return false;
+  }
+
+  if (
+    (pricingRuleDoc.maxQuantity as number) > 0 &&
+    quantity > (pricingRuleDoc.maxQuantity as number)
+  ) {
+    return false;
+  }
+
+  // Filter by Amount
+  if (
+    !pricingRuleDoc.minAmount?.isZero() &&
+    amount.lte(pricingRuleDoc.minAmount as Money)
+  ) {
+    return false;
+  }
+
+  if (
+    !pricingRuleDoc.maxAmount?.isZero() &&
+    amount.gte(pricingRuleDoc.maxAmount as Money)
+  ) {
+    return false;
+  }
+
+  // Filter by Validity
+  if (
+    pricingRuleDoc.validFrom &&
+    new Date(sinvDate.setHours(0, 0, 0, 0)).toISOString() <
+      pricingRuleDoc.validFrom.toISOString()
+  ) {
+    return false;
+  }
+  if (
+    pricingRuleDoc.validTo &&
+    new Date(sinvDate.setHours(0, 0, 0, 0)).toISOString() >
+      pricingRuleDoc.validTo.toISOString()
+  ) {
+    return false;
+  }
+  return true;
+}
+
+export function getPricingRulesConflicts(
+  pricingRules: PricingRule[],
+  item: string
+): string[] | undefined {
+  const pricingRuleDocs = Array.from(pricingRules);
+
+  const firstPricingRule = pricingRuleDocs.shift();
+  if (!firstPricingRule) {
+    return;
+  }
+
+  const conflictingPricingRuleNames: string[] = [];
+  for (const pricingRuleDoc of pricingRuleDocs.slice(0)) {
+    if (pricingRuleDoc.priority !== firstPricingRule?.priority) {
+      continue;
+    }
+
+    conflictingPricingRuleNames.push(pricingRuleDoc.name as string);
+  }
+
+  if (!conflictingPricingRuleNames.length) {
+    return;
+  }
+
+  throw new ValidationError(
+    t`Pricing Rules ${
+      firstPricingRule.name as string
+    }, ${conflictingPricingRuleNames.join(
+      ', '
+    )} has the same Priority for the Item ${item}.`
+  );
+}
+
+export function roundFreeItemQty(
+  quantity: number,
+  roundingMethod: 'round' | 'floor' | 'ceil'
+): number {
+  return Math[roundingMethod](quantity);
+}

models/index.ts

@@ -14,6 +14,8 @@ import { Payment } from './baseModels/Payment/Payment';
 import { PaymentFor } from './baseModels/PaymentFor/PaymentFor';
 import { PriceList } from './baseModels/PriceList/PriceList';
 import { PriceListItem } from './baseModels/PriceList/PriceListItem';
+import { PricingRule } from './baseModels/PricingRule/PricingRule';
+import { PricingRuleItem } from './baseModels/PricingRuleItem/PricingRuleItem';
 import { PrintSettings } from './baseModels/PrintSettings/PrintSettings';
 import { PrintTemplate } from './baseModels/PrintTemplate';
 import { PurchaseInvoice } from './baseModels/PurchaseInvoice/PurchaseInvoice';
@@ -61,6 +63,8 @@ export const models = {
   PrintSettings,
   PriceList,
   PriceListItem,
+  PricingRule,
+  PricingRuleItem,
   PurchaseInvoice,
   PurchaseInvoiceItem,
   SalesInvoice,

models/types.ts

@@ -22,6 +22,9 @@ export enum ModelNameEnum {
   Payment = 'Payment',
   PaymentFor = 'PaymentFor',
   PriceList = 'PriceList',
+  PricingRule = 'PricingRule',
+  PricingRuleItem = 'PricingRuleItem',
+  PricingRuleDetail = 'PricingRuleDetail',
   PrintSettings = 'PrintSettings',
   PrintTemplate = 'PrintTemplate',
   PurchaseInvoice = 'PurchaseInvoice',

schemas/app/AccountingSettings.json

@@ -107,6 +107,13 @@
       "default": false,
       "section": "Features"
     },
+    {
+      "fieldname": "enablePricingRule",
+      "label": "Enable Pricing Rule",
+      "fieldtype": "Check",
+      "default": false,
+      "section": "Features"
+    },
     {
       "fieldname": "fiscalYearStart",
       "label": "Fiscal Year Start Date",

schemas/app/NumberSeries.json

@@ -62,6 +62,10 @@
         {
           "value": "PurchaseReceipt",
           "label": "Purchase Receipt"
+        },
+        {
+          "value": "PricingRule",
+          "label": "Pricing Rule"
         }
       ],
       "default": "-",

schemas/app/PricingRule.json

@@ -0,0 +1,230 @@
+{
+  "name": "PricingRule",
+  "label": "Pricing Rule",
+  "naming": "numberSeries",
+  "isSubmittable": false,
+  "fields": [
+    {
+      "fieldname": "numberSeries",
+      "label": "Number Series",
+      "fieldtype": "Link",
+      "target": "NumberSeries",
+      "create": true,
+      "required": true,
+      "default": "PRLE-",
+      "section": "Default"
+    },
+    {
+      "fieldname": "isEnabled",
+      "label": "Is Pricing Rule Enabled",
+      "fieldtype": "Check",
+      "default": true,
+      "section": "Default"
+    },
+    {
+      "fieldname": "title",
+      "label": "Title",
+      "fieldtype": "Data",
+      "required": true,
+      "section": "Default"
+    },
+    {
+      "fieldname": "appliedItems",
+      "label": "Applied Items",
+      "fieldtype": "Table",
+      "target": "PricingRuleItem",
+      "required": true,
+      "edit": true,
+      "section": "Items"
+    },
+    {
+      "fieldname": "discountType",
+      "label": "Discount Type",
+      "fieldtype": "Select",
+      "required": true,
+      "section": "Default",
+      "options": [
+        {
+          "value": "Price Discount",
+          "label": "Price Discount"
+        },
+        {
+          "value": "Product Discount",
+          "label": "Product Discount"
+        }
+      ]
+    },
+    {
+      "fieldname": "priceDiscountType",
+      "label": "Price Discount Type",
+      "fieldtype": "Select",
+      "section": "Price Discount Scheme",
+      "options": [
+        {
+          "value": "rate",
+          "label": "Rate"
+        },
+        {
+          "value": "percentage",
+          "label": "Discount Percentage"
+        },
+        {
+          "value": "amount",
+          "label": "Discount Amount"
+        }
+      ]
+    },
+    {
+      "fieldname": "discountRate",
+      "label": "Rate",
+      "fieldtype": "Currency",
+      "section": "Price Discount Scheme"
+    },
+    {
+      "fieldname": "discountPercentage",
+      "label": "Discount Percentage",
+      "fieldtype": "Float",
+      "section": "Price Discount Scheme"
+    },
+    {
+      "fieldname": "discountAmount",
+      "label": "Discount Amount",
+      "fieldtype": "Currency",
+      "section": "Price Discount Scheme"
+    },
+    {
+      "fieldname": "freeItem",
+      "label": "Free Item",
+      "fieldtype": "Link",
+      "target": "Item",
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "freeItemQuantity",
+      "label": "Quantity",
+      "fieldtype": "Float",
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "freeItemUnit",
+      "label": "UOM",
+      "fieldtype": "Link",
+      "target": "UOM",
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "freeItemRate",
+      "label": "Rate",
+      "fieldtype": "Currency",
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "roundFreeItemQty",
+      "label": "Round Free Item Quantity",
+      "fieldtype": "Check",
+      "default": false,
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "roundingMethod",
+      "label": "Rounding Method",
+      "fieldtype": "Select",
+      "required": true,
+      "default": "round",
+      "section": "Product Discount Scheme",
+      "options": [
+        {
+          "value": "floor",
+          "label": "Floor"
+        },
+        {
+          "value": "round",
+          "label": "Round"
+        },
+        {
+          "value": "ceil",
+          "label": "Ceil"
+        }
+      ]
+    },
+    {
+      "fieldname": "isRecursive",
+      "label": "Is Recursive",
+      "fieldtype": "Check",
+      "default": false,
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "recurseEvery",
+      "label": "Recurse Every (As Per Transaction Unit)",
+      "fieldtype": "Float",
+      "section": "Product Discount Scheme"
+    },
+    {
+      "fieldname": "minQuantity",
+      "label": "Min Qty (As Per Stock Unit)",
+      "fieldtype": "Float",
+      "section": "Quantity and Amount"
+    },
+    {
+      "fieldname": "maxQuantity",
+      "label": "Max Qty (As Per Stock Unit)",
+      "fieldtype": "Float",
+      "section": "Quantity and Amount"
+    },
+    {
+      "fieldname": "minAmount",
+      "label": "Min Amount",
+      "fieldtype": "Currency",
+      "section": "Quantity and Amount"
+    },
+    {
+      "fieldname": "maxAmount",
+      "label": "Max Amount",
+      "fieldtype": "Currency",
+      "section": "Quantity and Amount"
+    },
+    {
+      "fieldname": "validFrom",
+      "label": "Valid From",
+      "fieldtype": "Date",
+      "section": "Validity"
+    },
+    {
+      "fieldname": "validTo",
+      "label": "Valid To",
+      "fieldtype": "Date",
+      "section": "Validity"
+    },
+    {
+      "fieldname": "priority",
+      "label": "Priority",
+      "fieldtype": "Select",
+      "section": "Priority",
+      "required": true,
+      "options": [
+        { "value": "1", "label": 1 },
+        { "value": "2", "label": 2 },
+        { "value": "3", "label": 3 },
+        { "value": "4", "label": 4 },
+        { "value": "5", "label": 5 },
+        { "value": "6", "label": 6 },
+        { "value": "7", "label": 7 },
+        { "value": "8", "label": 8 },
+        { "value": "9", "label": 9 },
+        { "value": "10", "label": 10 },
+        { "value": "11", "label": 11 },
+        { "value": "12", "label": 12 },
+        { "value": "13", "label": 13 },
+        { "value": "14", "label": 14 },
+        { "value": "15", "label": 15 },
+        { "value": "16", "label": 16 },
+        { "value": "17", "label": 17 },
+        { "value": "18", "label": 18 },
+        { "value": "19", "label": 19 },
+        { "value": "20", "label": 20 }
+      ]
+    }
+  ],
+  "keywordFields": ["name"]
+}

schemas/app/PricingRuleDetail.json

@@ -0,0 +1,23 @@
+{
+  "name": "PricingRuleDetail",
+  "label": "Pricing Rule Detail",
+  "isSingle": false,
+  "isChild": true,
+  "fields": [
+    {
+      "label": "Pricing Rule",
+      "fieldname": "referenceName",
+      "fieldtype": "Link",
+      "target": "PricingRule",
+      "readOnly": true
+    },
+    {
+      "label": "Item",
+      "fieldname": "referenceItem",
+      "fieldtype": "Link",
+      "target": "Item",
+      "readOnly": true
+    }
+  ],
+  "tableFields": ["referenceName", "referenceItem"]
+}

schemas/app/PricingRuleItem.json

@@ -0,0 +1,25 @@
+{
+  "name": "PricingRuleItem",
+  "label": "Pricing Rule Item",
+  "isChild": true,
+  "fields": [
+    {
+      "fieldname": "item",
+      "label": "Item",
+      "fieldtype": "Link",
+      "target": "Item",
+      "required": true
+    },
+    {
+      "fieldname": "unit",
+      "label": "Unit Type",
+      "placeholder": "Unit Type",
+      "fieldtype": "Link",
+      "target": "UOM",
+      "create": true,
+      "section": "Default"
+    }
+  ],
+  "tableFields": ["item", "unit"],
+  "quickEditFields": ["item", "unit"]
+}

schemas/app/SalesInvoice.json

@@ -75,6 +75,21 @@
       "fieldtype": "Check",
       "default": false,
       "hidden": true
+    },
+    {
+      "fieldname": "isPricingRuleApplied",
+      "fieldtype": "Check",
+      "default": false,
+      "hidden": true
+    },
+    {
+      "fieldname": "pricingRuleDetail",
+      "fieldtype": "Table",
+      "label": "Pricing Rule Detail",
+      "target": "PricingRuleDetail",
+      "edit": false,
+      "readOnly": true,
+      "section": "References"
     }
   ],
   "keywordFields": ["name", "party"]

schemas/app/SalesInvoiceItem.json

@@ -1,5 +1,13 @@
 {
   "name": "SalesInvoiceItem",
   "label": "Sales Invoice Item",
-  "extends": "InvoiceItem"
+  "extends": "InvoiceItem",
+  "fields": [
+    {
+      "fieldname": "isFreeItem",
+      "fieldtype": "Check",
+      "default": false,
+      "hidden": true
+    }
+  ]
 }

schemas/schemas.ts

@@ -20,6 +20,9 @@ import Payment from './app/Payment.json';
 import PaymentFor from './app/PaymentFor.json';
 import PriceList from './app/PriceList.json';
 import PriceListItem from './app/PriceListItem.json';
+import PricingRule from './app/PricingRule.json';
+import PricingRuleItem from './app/PricingRuleItem.json';
+import PricingRuleDetail from './app/PricingRuleDetail.json';
 import PrintSettings from './app/PrintSettings.json';
 import PrintTemplate from './app/PrintTemplate.json';
 import PurchaseInvoice from './app/PurchaseInvoice.json';
@@ -122,6 +125,10 @@ export const appSchemas: Schema[] | SchemaStub[] = [
   PriceList as Schema,
   PriceListItem as SchemaStub,
 
+  PricingRule as Schema,
+  PricingRuleItem as SchemaStub,
+  PricingRuleDetail as SchemaStub,
+
   Tax as Schema,
   TaxDetail as Schema,
   TaxSummary as Schema,

src/pages/POS/POS.vue

@@ -217,6 +217,7 @@ import {
   validateSinv,
 } from 'src/utils/pos';
 import Barcode from 'src/components/Controls/Barcode.vue';
+import { getPricingRule } from 'models/helpers';
 
 export default defineComponent({
   name: 'POS',
@@ -361,10 +362,27 @@ export default defineComponent({
     setTransferRefNo(ref: string) {
       this.transferRefNo = ref;
     },
+    removeFreeItems() {
+      if (!this.sinvDoc || !this.sinvDoc.items) {
+        return;
+      }
+
+      if (!!this.sinvDoc.isPricingRuleApplied) {
+        return;
+      }
+
+      for (const item of this.sinvDoc.items) {
+        if (item.isFreeItem) {
+          this.sinvDoc.items = this.sinvDoc.items?.filter(
+            (invoiceItem) => invoiceItem.name !== item.name
+          );
+        }
+      }
+    },
 
     async addItem(item: POSItem | Item | undefined) {
       // eslint-disable-next-line @typescript-eslint/no-floating-promises
-      this.sinvDoc.runFormulas();
+      await this.sinvDoc.runFormulas();
 
       if (!item) {
         return;
@@ -384,17 +402,21 @@ export default defineComponent({
 
       const existingItems =
         this.sinvDoc.items?.filter(
-          (invoiceItem) => invoiceItem.item === item.name
+          (invoiceItem) =>
+            invoiceItem.item === item.name && !invoiceItem.isFreeItem
         ) ?? [];
 
       if (item.hasBatch) {
-        for (const item of existingItems) {
+        for (const invItem of existingItems) {
-          const itemQty = item.quantity ?? 0;
+          const itemQty = invItem.quantity ?? 0;
           const qtyInBatch =
-            this.itemQtyMap[item.item as string][item.batch as string] ?? 0;
+            this.itemQtyMap[invItem.item as string][invItem.batch as string] ??
+            0;
 
           if (itemQty < qtyInBatch) {
-            item.quantity = (item.quantity as number) + 1;
+            invItem.quantity = (invItem.quantity as number) + 1;
+            invItem.rate = item.rate as Money;
+
             return;
           }
         }
@@ -414,7 +436,10 @@ export default defineComponent({
       }
 
       if (existingItems.length) {
+        existingItems[0].rate = item.rate as Money;
         existingItems[0].quantity = (existingItems[0].quantity as number) + 1;
+        await this.applyPricingRule();
+        await this.sinvDoc.runFormulas();
         return;
       }
 
@@ -562,6 +587,21 @@ export default defineComponent({
       validateSinv(this.sinvDoc as SalesInvoice, this.itemQtyMap);
       await validateShipment(this.itemSerialNumbers);
     },
+    async applyPricingRule() {
+      const hasPricingRules = await getPricingRule(
+        this.sinvDoc as SalesInvoice
+      );
+
+      if (!hasPricingRules || !hasPricingRules.length) {
+        this.sinvDoc.pricingRuleDetail = undefined;
+        this.sinvDoc.isPricingRuleApplied = false;
+        this.removeFreeItems();
+        return;
+      }
+
+      await this.sinvDoc.appendPricingRuleDetail(hasPricingRules);
+      await this.sinvDoc.applyProductDiscount();
+    },
 
     getItem,
   },

src/utils/pos.ts

@@ -21,7 +21,8 @@ import { showToast } from './interactive';
 export async function getItemQtyMap(): Promise<ItemQtyMap> {
   const itemQtyMap: ItemQtyMap = {};
   const valuationMethod =
-    fyo.singles.InventorySettings?.valuationMethod ?? ValuationMethod.FIFO;
+    (fyo.singles.InventorySettings?.valuationMethod as ValuationMethod) ??
+    ValuationMethod.FIFO;
 
   const rawSLEs = await getRawStockLedgerEntries(fyo);
   const rawData = getStockLedgerEntries(rawSLEs, valuationMethod);

src/utils/sidebarConfig.ts

@@ -279,6 +279,13 @@ function getCompleteSidebar(): SidebarConfig {
           schemaName: 'PriceList',
           hidden: () => !fyo.singles.AccountingSettings?.enablePriceList,
         },
+        {
+          label: t`Pricing Rule`,
+          name: 'pricing-rule',
+          route: '/list/PricingRule',
+          schemaName: 'PricingRule',
+          hidden: () => !fyo.singles.AccountingSettings?.enablePricingRule,
+        },
       ] as SidebarItem[],
     },
     getReportSidebar(),