Add L-shaped room support to paint calculator

[durimkryeziu]

Models an L-shaped room as an outer rectangle with a rectangular cut-out removed from one corner. Area = outer.area() minus cutout.area(). The cut-out must be strictly smaller than the outer rectangle on both length and width; equal dimensions are also rejected.

PaintCalculator gains a "3) L-shaped" menu option with four sequential prompts (outer length/width, cut-out length/width). The invalid-shape error is updated from "Please enter 1 or 2" to "Please enter 1, 2 or 3".

Summary by CodeRabbit

Release Notes

• New Features
  • Paint calculator now supports L-shaped rooms in addition to rectangular and round options. Users can input outer rectangle dimensions and cutout dimensions to accurately estimate paint needed for L-shaped room configurations.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 496498b1-0d76-497c-9789-96e5bb95dc60

📥 Commits

Reviewing files that changed from the base of the PR and between 69fc874 and e4f0e8e.

📒 Files selected for processing (5)

• paint-calculator/src/main/java/dev/delivercraft/paint/LShapedRoom.java
• paint-calculator/src/main/java/dev/delivercraft/paint/PaintCalculator.java
• paint-calculator/src/main/java/dev/delivercraft/paint/RoomDimensions.java
• paint-calculator/src/test/java/dev/delivercraft/paint/LShapedRoomTest.java
• paint-calculator/src/test/java/dev/delivercraft/paint/PaintCalculatorTest.java

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📝 Walkthrough

Walkthrough

This PR adds L-shaped room support to a paint calculator by introducing a new LShapedRoom record that computes area as an outer rectangle minus a cutout rectangle, integrating it into the sealed RoomDimensions type hierarchy, wiring it into the calculator's user prompts and input flow, and validating the entire feature with unit and integration tests.

Changes

L-shaped room feature

Layer / File(s)	Summary
L-shaped room contract and sealed interface paint-calculator/src/main/java/dev/delivercraft/paint/LShapedRoom.java, paint-calculator/src/main/java/dev/delivercraft/paint/RoomDimensions.java	LShapedRoom record stores outer and cutout RectangularRoom instances with constructor validation ensuring cutout is strictly smaller on both dimensions, computes area as outer.area() minus cutout.area(), and is added to the sealed RoomDimensions permits clause.
PaintCalculator UI and input flow paint-calculator/src/main/java/dev/delivercraft/paint/PaintCalculator.java	Shape menu prompt extended to "3) L-shaped", new dimension prompts for outer rectangle and cutout rectangle dimensions, shape switch case "3" routes to readLShapedDimensions() which reads four inputs and constructs an LShapedRoom from two RectangularRoom objects, and invalid-choice error updated to permit options 1, 2, or 3.
LShapedRoom unit tests paint-calculator/src/test/java/dev/delivercraft/paint/LShapedRoomTest.java	Tests verify null-checks on outer and cutout, area calculation for integer and fractional dimensions, cutout validation (rejecting equal or larger cutouts with specific error message), and paint estimation including gallon ceiling rounding across single and multi-gallon scenarios.
PaintCalculator integration tests and refactoring paint-calculator/src/test/java/dev/delivercraft/paint/PaintCalculatorTest.java	Adds L-shaped test cases validating correct area output and fail-fast invalid-input behavior, updates parameterized and null-shape tests to assert "Please enter 1, 2 or 3", refactors test constants to share VALID_WIDTH, and verifies dimension validation exception message.

🎯 2 (Simple) | ⏱️ ~12 minutes

A rabbit hops through painted halls,
Adding L's to rectangular walls!
🎨 Cutouts carved with validation strong,
Test cases run the whole day long 🐰✨

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main change: adding support for L-shaped rooms to the paint calculator application.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/paint-calculator-l-shaped-room

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.17%. Comparing base (69fc874) to head (e4f0e8e).
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Additional details and impacted files

@@             Coverage Diff              @@
##               main      #24      +/-   ##
============================================
+ Coverage     78.33%   79.17%   +0.84%     
- Complexity      123      129       +6     
============================================
  Files            34       35       +1     
  Lines           420      437      +17     
  Branches         25       26       +1     
============================================
+ Hits            329      346      +17     
  Misses           84       84              
  Partials          7        7              

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