Discount System — Legacy business_manager

Overview

The discount system allowed restaurant managers to apply price reductions to individual menu items, with optional conditions restricting which customers qualify for the discount.

---

Data Model

Discounts are stored as an object on each menu item in Firestore:

{
  "code": "P-15",
  "message": "15% off your order!"
}

---

Discount Code Format

The code string encodes both the discount type, value, and optional conditions in a compact format.

Pattern

{TYPE}-{VALUE}

With conditions:

{TYPE}-{VALUE}_SWITCH{CASE:{COND_TYPE}-{COND_VALUE};CASE:{COND_TYPE}-{COND_VALUE};...}

Regex

/([A-Za-z]+)-([0-9]+)_SWITCH\{([A-Za-z0-9:;_-]+)\}/i
/([A-Za-z]+)-([0-9]+)/i

---

Discount Types

Code	Name	Description	Example	Result
P	Percentage	Reduces price by a percentage	P-50	50% off
FIXED	Fixed Amount	Subtracts a flat amount from the price	FIXED-10	$10 off

Constraints

• P (Percentage): Value must be between 1 and 100. Cannot exceed 100%.
• FIXED: Value must be a positive number. If the result falls to <= 0.4, the price is set to 0 (free).

---

Conditional Discounts

Conditions restrict who is eligible for a discount. Up to one condition is supported.

Condition Types

Code	Name	Description	Condition Value Meaning
FIRSTBUY	First Purchase	Discount applies only if the customer has never ordered from this restaurant	0 (ignored)
TOTALSPENT	Total Spent	Discount applies if the customer's total spending at this restaurant >= value	Currency amount
TOTALITEMS	Total Items Bought	Discount applies if the customer's total items purchased >= value	Item count
TOTALORDERS	Total Orders	Discount applies if the customer's total orders placed >= value	Order count

Condition Value

• For FIRSTBUY: The value is always 0 (it's a boolean check, not a threshold).
• For TOTALSPENT, TOTALITEMS, TOTALORDERS: The value is the minimum threshold the customer must meet.

---

Code Examples

Simple Discounts

Code	Meaning
P-15	15% off
P-50	50% off
P-100	100% off (free)
FIXED-10	$10 off
FIXED-50	$50 off

Conditional Discounts

Code	Meaning
P-20_SWITCH{CASE:FIRSTBUY-0;}	20% off for first-time buyers
P-10_SWITCH{CASE:TOTALORDERS-5;}	10% off after 5 orders
FIXED-25_SWITCH{CASE:TOTALSPENT-500;}	$25 off after spending $500
P-15_SWITCH{CASE:TOTALITEMS-10;}	15% off after buying 10 items

---

Price Calculation Logic

Business Manager Side (priceAfterDiscount.js)

// Simple: no condition evaluation, just applies the math
const priceAfterDiscount = (price, code) => {
  const type = code.split('-')[0]  // "P" or "FIXED"
  const value = code.split('-')[1]

  switch (type) {
    case 'FIXED':
      finalPrice -= value
      if (finalPrice <= 0.4) finalPrice = 0
      break
    case 'P':
      finalPrice = price * (1 - value / 100)
      break
  }
  return finalPrice
}

Customer Side (priceAfterDiscount.js)

// Full version: calculates price AND evaluates conditions
const priceAfterDiscount = (price, discount, user, resId) => {
  if (!discount) return { finalPrice: price, isAvailableForUser: false }

  const discountObj = generateDiscountObj(discount)

  // 1. Calculate reduced price
  // ... (same logic as above)

  // 2. Evaluate conditions
  if (discountObj.conditions.length && user.restaurants) {
    const currentRes = user.restaurants.find(r => r.accessToken === resId)
    switch (discountObj.conditions[0].type) {
      case 'FIRSTBUY':  isAvailableForUser = currentRes === undefined; break
      case 'TOTALSPENT': isAvailableForUser = currentRes.totalAmount >= value; break
      case 'TOTALITEMS': isAvailableForUser = currentRes.totalItems >= value; break
      case 'TOTALORDERS': isAvailableForUser = currentRes.totalOrders >= value; break
    }
  } else {
    isAvailableForUser = true  // No conditions = always available
  }

  return { finalPrice, isAvailableForUser }
}

Key Behavior

• If a user is not logged in, all discounts are shown (no condition evaluation possible).
• If a user is logged in but has no order history for the restaurant, only FIRSTBUY discounts apply.
• If there are no conditions, the discount is always available.

---

Manager UI (DiscountDialog.jsx)

The manager created/edited discounts through a MUI dialog:

1. Discount Value — Numeric input (1-100 for P, any positive for FIXED)
2. Discount Type — Dropdown: Percentage or Fixed
3. Message — Short text displayed to customers (max 255 chars)
4. Add Conditions — Checkbox to enable conditional logic
5. Condition Type — Dropdown when conditions enabled (FIRSTBUY, TOTALSPENT, TOTALITEMS, TOTALORDERS)
6. Condition Value — Numeric input (disabled for FIRSTBUY)

Persistence

• Saving writes { code, message } to the menu item's discount field in Firestore.
• Removing deletes the discount field from the item.

Display

On the menu card (MenuNestedCard.jsx), discounts appear as a colored badge next to the price:

[15% With Condition] [100ج.م]

---

User Data Structure

The condition evaluator reads from user.restaurants[], where each entry tracks:

{
  "accessToken": "restaurant_id",
  "totalAmount": 500,
  "totalItems": 12,
  "totalOrders": 5
}

These values are incremented by useUpdateUserOnSendOrder when a user places an order.

---

File Reference

File	Location	Purpose
DiscountDialog.jsx	business_manager/src/Component/	Manager UI for creating/editing discounts
generateDiscountCode.js	business_manager/src/functions/	Encodes form values → discount code string
generateDiscountObj.js	business_manager/src/functions/	Parses discount code string → discount object
priceAfterDiscount.js	business_manager/src/functions/	Calculates price after discount (manager side)
priceAfterDiscount.js	customer_app/src/utils/	Calculates price + evaluates conditions (customer side)
generateDiscountObj.js	customer_app/src/utils/	Parses discount codes on customer side
conditionalValuesSlice.js	business_manager/src/rtk/slices/	Redux state for discount dialog visibility
cartSlice.js	customer_app/src/rtk/slices/	Handles discount code application on cart items
MenuNestedCard.jsx	business_manager/src/Component/	Displays discount badge on menu items