# Phase 2 Implementation Complete - CORE BUSINESS LOGIC (SERVICES)

## Summary
Phase 2 (Core Business Logic) has been fully implemented with 4 services providing loan management orchestration:

## Completed Services

### 1. LoanService (app/Services/LoanService.php) ✓
- `calculateInterest()` - Interest = Amount × (Interest Rate / 100)
- `calculateFees()` - LAF fee (default 2%) + registration fee (default 500)
- `calculateWeeklyInstallment()` - Splits total into weekly payments
- `generateRepaymentSchedule()` - Creates weekly Repayment records starting 7 days after disbursement
- `createLoan()` - Full loan creation with all calculations and status 'pending'
- `updateLoanStatus()` - Lifecycle: pending → approved → active → completed/defaulted
- `disburseLoan()` - Activates loan, creates disbursement transaction, generates schedule
- `completeLoan()` - Marks loan completed when all repayments paid
- `defaultLoan()` - Marks loan defaulted when threshold (default 30 days) exceeded
- `getLoanSummary()` - Returns complete loan snapshot with repayment stats

### 2. RepaymentService (app/Services/RepaymentService.php) ✓
- `recordPayment()` - Logs payment, updates balance/status, creates transaction
- `updateRepaymentStatus()` - Transitions: pending ↔ overdue → paid
- `calculateBalance()` - Returns remaining due amount
- `markAsOverdue()` - Transitions repayment to overdue + triggers fine application
- `getOverdueRepayments()` - Returns collection for overdue items
- `applyPartialPayment()` - Handles incomplete payments, keeps pending status
- `isOverdueTodayOrPastDue()` - Boolean check for due status
- `getDaysOverdue()` - Calculates days past due date
- `getRepaymentSummary()` - Complete repayment snapshot

### 3. FineService (app/Services/FineService.php) ✓
- `calculateFine()` - Fine = amount_due × (days_overdue × daily_rate%) [default 0.5%/day]
- `applyFine()` - Creates/updates Fine record when overdue
- `getFineDetails()` - Returns fine breakdown with total due including fine
- `captureFineOnPayment()` - Allocates payment to repayment first, then fine
- `waiveFine()` - Admin action to reduce/remove fine with logging
- `getUserTotalFines()` - Sums all fines for a user
- `getUserPendingFines()` - Returns unpaid fines for a user

### 4. TransactionService (app/Services/TransactionService.php) ✓
- `recordPaymentTransaction()` - Logs incoming payment with reference (M-Pesa, etc)
- `recordDisbursementTransaction()` - Logs loan disbursement
- `updateTransactionStatus()` - pending → completed/failed/reversed
- `getTransactionHistory()` - Filtered audit trail by user, loan, type, date range
- `getTransactionDetails()` - Complete transaction snapshot
- `getLoanPaymentSummary()` - Payment totals for a specific loan
- `getUserPaymentSummary()` - Aggregate payments/disbursements for user
- `reverseTransaction()` - Reverses transaction for refunds/corrections

## Key Features
✓ All money fields use decimal:2 for precision
✓ Proper lifecycle state management with guards
✓ Automatic fine triggering on overdue status
✓ Comprehensive transaction audit trail
✓ Configurable settings (fine rate, fee percentages, default threshold)
✓ Full model relationships implemented
✓ No syntax errors - all services validated

## Next Steps (Phase 3)
Admin Backend (WEB): CRUD controllers for tiers, loans, repayments, fines
