# Masunzu Bar Hotel - Feature Implementation Summary

## Completed Features ✅

### 1. Invoice Expiration System
- **File**: `/includes/invoice_management.php`
- **Features**:
  - Auto-expire invoices if not approved within 3 hours
  - Stock reservation and reversion on expiry
  - Database column initialization (expires_at, expiration_status)
  - Notification system to admin and initiator
  - Approved invoice finalization function

### 2. Cashier Shift Validation Enhancement
- **File**: `/modules/cashiers/process_payment.php`
- **Features**:
  - Improved error page with header (uses page header)
  - "Return to Dashboard" button
  - "Start Shift" button (Go to Balance Management)
  - Professional error UI with warning icon

### 3. Today's Sales Display & CSV Export
- **File**: `/modules/cashiers/sold_products.php`
- **Features**:
  - Defaults to today's sales (changed from 7-day default)
  - Searchable sales table
  - Date range filters
  - CSV download button with proper headers
  - Includes: Time, Invoice, Customer, Cashier, Product, Quantity, Amount, Payment Method

### 4. Security & Audit Logging Framework
- **File**: `/includes/security.php`
- **Features**:
  - Comprehensive audit logging system
  - IP address tracking
  - User agent logging
  - Transaction authorization verification
  - Suspicious activity detection
  - Double-submission token prevention
  - Role-based permission checking
  - Payment and cash transaction logging

### 5. Export Helpers Framework
- **File**: `/includes/export_helpers.php`
- **Features**:
  - PDF new-tab opener with proper headers
  - CSV export with safe value escaping
  - Numbered data export
  - Generic export info lookup
  - Common table export presets

## In Progress / Pending Features ⏳

### Dashboards - Loan Analytics & Expired Invoice Metrics
- Need to add to admin_dashboard.php:
  - Count of expired invoices (last 7 days)
  - Clients late on loan repayments
  - Eligible clients for loans
  - Total loan due amount (unpaid)
  - Province-wise loan due breakdown

### Invoice List in create_invoice.php
- Add searchable/filterable list of invoices with:
  - Status (pending, approved, expired)
  - Initiator name
  - Approval status
  - Sales mode (loan/normal)
  - Date (numbered list, latest to oldest)

### Process Payment PDF Receipt Enhancement
- Add company information before client information
- Ensure proper TCPDF integration

### Bank Ledger Page (bank_ledger.php)
- Default display to BIF currency account
- Show current metrics (balance, recent transactions)

### Accountant Account Management (bank_accounts.php)
- Each accountant has own balance account
- Receive money from cashiers
- Deposit to main company account (limited by balance)
- Receipt generation (before/after balance, timestamp)
- Manager view of accountant account balances

### CSV Export for All Lists
- Implement in:
  - create_invoice.php (invoice history)
  - approve_invoices.php
  - loan_repayments.php
  - requisition list pages
  - product listings
  - customer lists

### Responsive Design
- Ensure all pages work on mobile/tablet/desktop
- Mobile-first CSS approach
- Touch-friendly buttons and inputs

### PDF New Tab Opening
- Integrate send_pdf_headers() into:
  - Receipt printing
  - Invoice printing
  - Reports PDF generation

## Database Modifications Made 🗄️

### New Columns Added:
1. `paid_invoices`:
   - expires_at DATETIME
   - expiration_status ENUM('active','expired','approved')

2. `invoice`:
   - expires_at DATETIME
   - expiration_status ENUM('active','expired','approved')

3. `main_stock`:
   - reserved_quantity INT (for invoice stock reservation)

### New Tables Created:
1. `audit_log` (if not exists)
   - Comprehensive transaction and action logging
   - IP address tracking
   - User agent logging

## Security Measures Implemented 🔒

✅ Audit logging of all transactions
✅ IP address tracking
✅ Double-submission prevention (tokens)
✅ User authorization checks
✅ Suspicious activity detection
✅ Currency validation
✅ Transaction authorization verification
✅ Role-based access control

## Next Priority Tasks

1. **Dashboard Updates** - Add loan metrics and expired invoice counts
2. **Invoice List UI** - Add searchable/filterable invoice history to create_invoice.php
3. **Accountant Accounts** - Implement separate accountant balance system
4. **CSV Exports** - Add to all major list pages
5. **Receipt PDF** - Add company info and new-tab opening
6. **Responsive Design** - Mobile-first CSS updates

## Testing Recommendations

1. Test invoice auto-expiration cron job
2. Verify stock reversion on expired invoices
3. Test cashier shift validation error page
4. Verify CSV downloads with sample data
5. Test audit logging captures all actions
6. Test authorization checks prevent unauthorized access
7. Test on mobile devices (300px to 1920px widths)

## Integration Points

### For Admin Developers:
- Include `/includes/invoice_management.php` for invoice handling
- Include `/includes/security.php` for audit logging and authorization
- Include `/includes/export_helpers.php` for CSV/PDF exports
- Use `audit_log()` function on all critical transactions
- Use `verify_transaction_token()` for form submissions

### For Dashboard Developers:
- Query new `audit_log` table for activity tracking
- Use `expiration_status` in invoice queries
- Check `audit_log` for user activity metrics
