Mr. J Dev Smart Discount Rules

Mr. J Dev Smart Discount Rules gives you a flexible, priority-based discount engine on top of WooCommerce. Rules are evaluated automatically at cart/checkout — no coupon code needed.

Discount Types:

• Percentage — e.g. “10% off the entire cart”
• Fixed Amount — e.g. “₹100 off cart”
• Buy X Get Y — e.g. “Buy 2, get 1 free” (cheapest eligible items are discounted)

Conditions (can be combined):

• Minimum cart spend
• User role (customer, wholesale, subscriber, etc.)
• Product category slug present in cart
• Day(s) of the week (time-based deals like weekend sales)

Rule Control:

• Priority system — only the highest-priority matching rule fires (no stacking)
• Enable / disable rules without deleting them
• Delete rules permanently

The discount appears as a cart fee line item with the rule name as its label, keeping the cart transparent to customers.

Usage Examples

Weekend 15% sale for all users:

• Type: Percentage | Value: 15
• Conditions → Days: Saturday, Sunday

₹500 spend → ₹50 off for Wholesale customers:

• Type: Fixed | Value: 50
• Min Spend: 500 | Conditions → Role: wholesale_customer

Buy 2 T-shirts, get 1 free (cheapest):

• Type: Buy X Get Y | Buy: 2 | Get: 1
• Conditions → Category: t-shirts

How Buy X Get Y Works

The Buy X Get Y rule uses a group-based algorithm that always gives the cheapest qualifying items for free.

Algorithm (step by step):

1. All items in the cart are flattened into individual unit prices.
   e.g. Cart: 2× T-shirt @ ₹200, 1× Jeans @ ₹800, 1× Cap @ ₹150
   → unit prices: [200, 200, 800, 150]

2. Prices are sorted cheapest-first:
   → [150, 200, 200, 800]

3. The number of complete qualifying groups is calculated:
   group size = Buy + Get = 3 + 1 = 4
   total items = 4 → floor(4 ÷ 4) = 1 group qualifies

4. For each group, the cheapest Get items are free:
   → ₹150 (cap) is free → discount applied = −₹150

The discount is added as a negative cart fee line item labelled with the rule name, keeping the breakdown transparent to customers.

Why cheapest-first?

This prevents customers from gaming the rule by adding one cheap item to get an expensive item free. The cheapest item always fills the free slot.

Only complete groups qualify:

With Buy 2 Get 1 and 5 items in the cart:
→ floor(5 ÷ 3) = 1 complete group → 1 item free (the cheapest)
The leftover 2 items do not form a group and get no discount.

Configuration examples:

• Buy 1 Get 1 Free → Buy: 1, Get: 1
• Buy 2 Get 1 Free → Buy: 2, Get: 1
• Buy 3 Get 2 Free → Buy: 3, Get: 2
• Buy 4 Get 1 Free (BOGO4)→ Buy: 4, Get: 1

Combine with a Product Category condition to restrict the rule to specific product lines (e.g. only T-shirts, only Electronics).