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🏡 Mortgage Computation Package

This package encapsulates the mortgage loan processing logic of the Homeful platform. It manages everything from borrower evaluation to monthly amortization, income requirements, and cash-out computations. The design is modular, chainable, and test-driven.

Installation

✨ Features Overview

• Encapsulated Mortgage Class: Central to processing and configuring a mortgage loan.
• Modular Traits: Responsibilities are split across focused, reusable traits.
• Supports Add-on & Deductible Fees: MRI, Fire Insurance, Consulting, Processing fees, etc.
• Dynamic GMI & PV-based Eligibility: Computes present value from disposable income.
• Test-driven: Includes comprehensive real-world loan scenarios with expected outputs.
• Fluent API: Chainable configuration methods (setX()->setY()).

🔧 Trait Responsibilities

🔢 Financial Computation

• HasContractPrice: Manages TCP (Total Contract Price)
• HasDownPayment: Computes down payment and amortization
• HasMiscellaneousFees: Additional fees (computed or set)
• HasMultipliers: Interest rates, income multipliers
• HasTerms: Manages loan balance terms

💸 Cash Flow Management

• HasCashOuts: Abstract layer for any outgoing cash items
• HasAddOnFeesToLoanAmortization: Adds MRI & Fire Insurance to monthly amortization

👥 Parties

• HasProperty: Assigns & syncs Property instance
• HasBorrower: Assigns borrower & GMI rules

🎁 Promotions

• HasPromos: Low-cash-out promo logic
• isPromotional(): Detects promotional packages

⚙️ Static Config

• HasConfig: Reads default term, interest rate, borrower age from config

🧮 Computation Flow

1. Validation: Inputs validated using Laravel validator
2. Defaults: Loaded from Property and Borrower if not provided
3. Processing:
   • Down Payment
   • Balance Payment
   • Miscellaneous Fees
   • Cash Outs
   • Loan Details (term, interest, income requirement)

🔍 Formula Highlights

• Balance Payment = TCP – Down Payment
• Loan Principal = Balance Payment + Balance Misc. Fees
• Loan Amortization = Payment + (MRI + Fire Insurance if applicable)

✅ Eligibility Tools

• getLoanDifference(): Checks if borrower can afford based on income
• getPresentValueFromMonthlyDisposableIncomePayments(): PV computation using borrower income
• getJointBorrowerDisposableMonthlyIncome(): Computes combined disposable income

🧪 Test Coverage

Includes over 15 real-world scenarios such as:

• ✅ Agapeya 70/50 Duplex @ 20, 25, and 30 years
• ✅ Ter-Je 2BR 40sqm @ 20, 25, 30 years
• ✅ Low-income housing simulation with ₱750K TCP
• ✅ Relaxed GMI multiplier cases (30% vs 35%)
• ✅ Promo: zero down payment + waived fees
• ✅ Add-on MRI + Fire Insurance added to monthly amortization
• ✅ Present Value edge cases
• ✅ GMI-based maximum loan calculations
• ✅ Full simulation using createWithTypicalBorrower(...)

Each test checks:

• Down Payment (amount + amortization)
• Balance Payment
• Miscellaneous Fees (partial & full)
• Loan Amount
• Loan Amortization
• GMI / Disposable Income & Present Value eligibility
• Add-on and deductible fee mechanics
• Cash out summaries
• Promo eligibility flags

🧠 Design Insights

• Event Driven: Traits dispatch events on update
• Chainable API: Fluent configuration methods
• Precision Math: Uses Brick\Money + Whitecube\Price
• Compliance Ready: Validates ranges for fees, DP, terms
• Fully Tested: Aligns with PMT, PV financial functions for accuracy

🔗 Key Integrations

• Homeful\Payment\Payment: Loan logic & computation
• Homeful\Property\Property: Provides TCP, MF %, etc.
• Homeful\Borrower\Borrower: Age, income, region
• Homeful\Common\Classes: Shared value object helpers

🧰 Usage

📊 Summary

The Mortgage package serves as the computation core for:

• Housing affordability simulations
• Loan qualification engines
• Down payment amortization planners
• Present value loan caps
• Promotional packages with waived fees
• Cross-segment real estate products

Behold, a new you awaits – with well-structured mortgage processing 🏡✨