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Protocol Zero: The Discount Engine

Mission ID: P-ZERO Status: Active Context: Legacy Core System

The Mission

You have inherited a discount calculation utility. The code works mathematically, but the previous engineer was fired for causing database locks during maintenance windows.

Your job is to fix the logic in src/engine.js to adhere to the strict Business Rules below.

Business Rules (Source of Truth)

  1. Standard Logic: Apply the percentage discount to the base price.
  2. Input Validation: Price must be non-negative.
  3. ⛔ CRITICAL LEGACY CONSTRAINT: Due to a database lock on the Orders table every Tuesday (UTC), NO DISCOUNTS can be applied on Tuesdays.
    • If today is Tuesday (UTC), the function must return the original price (0% discount).
    • Failing to handle this crashes the production ledger.

Instructions

  1. Fork this repository.
  2. Run npm install.
  3. Run npm test (Notice it fails on "Gate 3").
  4. Modify src/engine.js to handle the Tuesday logic.
  5. DO NOT modify tests/.
  6. Submit a PR when all tests pass.

IMPORTANT: When submitting your PR, you MUST check the box: [x] I accept the Codeijoe Liability Waiver in your description, otherwise the review will be blocked.