Retail Stores Sales Rule-Engine With Scala Functional Programming

Overview

This is a Scala program that applies qualifying rules to transactions, writes the output transactions to a file, and inserts them into a PostgreSQL database. The program also monitors an input directory for new files, processes the files, and deletes the input files if they were successfully processed and inserted into the database.

Installation

• Install Scala
• Install sbt
• Install PostgreSQL
• Clone this repository using git clone https://github.com/yourusername/Scala-Rule-Engine.git

Usage

1. Navigate to the cloned repository: cd Scala-Rule-Engine
2. Compile the program: sbt compile
3. Run the program: sbt run
4. Place input files in the in directory
5. Output files will be written to the out directory
6. Logs will be written to the Log directory

Configuration

You can configure the input and output directories in the RuleEngine.scala file. You can also configure the PostgreSQL database connection in the DatabaseConnection.scala file.

Contributing

Contributions are welcome! Please fork this repository and submit a pull request with your changes.

Rules

The project simulates a discount calculator for a sales system that offers discounts based on various rules and conditions. The rules are as follows:

Qualifying Rules

• Products with less than 30 days remaining until expiration (from the day of transaction) are eligible for discounts.
• Cheese and wine products are currently on sale.
• Sales made using Visa cards are eligible for a minor discount.

Calculation Rules

• Discounts are calculated based on the number of days remaining until the product's expiration date:
  • If 29 days remaining -> 1% discount
  • If 28 days remaining -> 2% discount
  • If 27 days remaining -> 3% discount
  • And so on...
• Cheese products are eligible for a 10% discount.
• Wine products are eligible for a 5% discount.
• Products sold on 23rd March have a special discount of 50%.
• If more than 5 of the same product are bought:
  • 6-9 units -> 5% discount
  • 10-14 units -> 7% discount
  • More than 15 units -> 10% discount
• Sales made through the app are eligible for a special discount, based on the quantity rounded up to the nearest multiple of 5:
  • Quantity: 1, 2, 3, 4, 5 -> Discount: 5%
  • Quantity: 6, 7, 8, 9, 10 -> Discount: 10%
  • Quantity: 11, 12, 13, 14, 15 -> Discount: 15%
  • And so on...

How to Use

To use this discount calculator, simply input the product's expiration date, type of product, quantity, and payment method, and the calculator will output the discounted price.