# TCPDF Integration for KSO Chandigarh - Receipt and Invoice System

## Overview

This document outlines the successful integration of TCPDF library into the KSO Chandigarh management system for generating professional PDF receipts and invoices.

## Installation Summary

### 1. TCPDF Library Installation
- ✅ Downloaded TCPDF from GitHub
- ✅ Extracted to `libraries/TCPDF-main/`
- ✅ Library is ready for use

### 2. Directory Structure
```
KSOCHD/
├── libraries/
│   └── TCPDF-main/
│       ├── tcpdf.php (main library)
│       ├── config/
│       ├── fonts/
│       └── include/
├── api/
│   └── services/
│       ├── PDFService.php (new)
│       └── ReceiptService.php (updated)
├── storage/
│   ├── receipts/
│   │   └── 2025/
│   └── invoices/
│       └── 2025/
└── test files...
```

## New Components

### 1. PDFService.php
**Location**: `api/services/PDFService.php`

**Features**:
- Custom TCPDF wrapper class
- KSO-branded header and footer
- Professional receipt generation
- Professional invoice generation
- Automatic file saving
- PDF string output capability

**Methods**:
- `generateReceipt($transaction_data)` - Generate receipt PDF
- `generateInvoice($invoice_data)` - Generate invoice PDF
- `savePDF($filename)` - Save PDF to file
- `getPDFString()` - Get PDF as string

### 2. Updated ReceiptService.php
**Location**: `api/services/ReceiptService.php`

**Changes**:
- ✅ Integrated PDFService
- ✅ Updated `generateReceiptPDF()` method
- ✅ Changed default file extension to PDF
- ✅ Enhanced error handling

### 3. Updated InvoiceService.php
**Location**: `api/services/ReceiptService.php` (extended class)

**Changes**:
- ✅ Integrated PDFService for invoice generation
- ✅ Updated `generateInvoicePDF()` method
- ✅ Enhanced invoice data handling

### 4. Updated API Endpoints
**Location**: `api/receipts/index.php`

**Changes**:
- ✅ Updated download headers for PDF
- ✅ Updated view headers for PDF
- ✅ Proper content-type handling

## PDF Features

### Receipt PDF Features
- **Header**: KSO Chandigarh branding with logo placeholder
- **Member Details**: Name, KSO ID, Email, Phone, Membership Type
- **Transaction Details**: Description, Type, Amount, Status in table format
- **Payment Details**: Method, Reference Number
- **Notes Section**: Additional notes if provided
- **Signature Section**: Spaces for received by and authorized signature
- **Footer**: Generation timestamp and page numbers

### Invoice PDF Features
- **Header**: KSO Chandigarh branding
- **Invoice Details**: Invoice number, date, due date
- **Bill To Section**: Complete member information
- **Items Table**: Description, Quantity, Unit Price, Total
- **Total Amount**: Prominently displayed
- **Payment Instructions**: Clear payment guidelines
- **Status**: Current invoice status

## API Usage

### Generate Receipt
```php
POST /api/receipts/generate-receipt
Content-Type: application/json

{
    "transaction_id": 123
}
```

### Generate Invoice
```php
POST /api/receipts/generate-invoice
Content-Type: application/json

{
    "member_id": 456,
    "items": [
        {
            "description": "Annual Membership Fee",
            "quantity": 1,
            "unit_price": 1000.00
        }
    ],
    "due_date": "2025-08-10"
}
```

### Download PDF
```php
GET /api/receipts/download?id=receipt_id
```

### View PDF in Browser
```php
GET /api/receipts/view?id=receipt_id
```

## Testing

### Test Files Created
1. **test-tcpdf-integration.php** - Direct PDF generation test
2. **test-pdf-interface.html** - Web interface for testing
3. **test-pdf-api.php** - Simple API for testing

### Test Commands
```php
// Navigate to your project URL
http://localhost/KSOCHD/test-tcpdf-integration.php
http://localhost/KSOCHD/test-pdf-interface.html
http://localhost/KSOCHD/test-pdf-api.php
```

## Configuration

### Organization Settings
You can customize organization details in PDFService.php:
```php
$pdf->setOrganizationDetails(
    'KSO Chandigarh',
    'Your Address Here',
    '+91-XXXXXXXXXX',
    'info@ksochandigarh.org'
);
```

### PDF Settings
- **Page Size**: A4
- **Orientation**: Portrait
- **Margins**: 15mm all around
- **Font**: Helvetica (default)
- **Colors**: KSO Blue (#004899) for headers

## File Storage

### Storage Locations
- **Receipts**: `storage/receipts/YYYY/`
- **Invoices**: `storage/invoices/YYYY/`

### File Naming Convention
- **Receipts**: `{receipt_number}.pdf`
- **Invoices**: `{invoice_number}.pdf`

## Database Integration

### Required Tables
The system expects these tables to exist:
- `receipts` - Receipt records
- `invoices` - Invoice records
- `finance` - Transaction records
- `members` - Member information
- `admins` - Admin user information

### Receipt Number Generation
Format: `KSO-{TYPE}-{YYYY}{MM}{NNNN}`
- **MF**: Membership Fee
- **EF**: Event Fee
- **DN**: Donation
- **OT**: Other
- **GN**: General

Example: `KSO-MF-202507-0001`

## Error Handling

### Common Issues and Solutions

1. **PDF Generation Fails**
   - Check TCPDF library path
   - Verify storage directory permissions
   - Review error logs

2. **File Not Found**
   - Ensure storage directories exist
   - Check file permissions
   - Verify file path construction

3. **Database Errors**
   - Verify table structure
   - Check database connection
   - Review required fields

## Security Considerations

### File Access
- Store PDFs outside web root if possible
- Implement proper authentication for downloads
- Use secure file serving methods

### Data Validation
- Validate all input data
- Sanitize file names
- Check file permissions

## Future Enhancements

### Potential Improvements
1. **Email Integration**: Automatically email PDFs
2. **Batch Generation**: Generate multiple PDFs
3. **Templates**: Multiple PDF templates
4. **Digital Signatures**: Add digital signatures
5. **Watermarks**: Add security watermarks
6. **Multi-language**: Support multiple languages

### Template Customization
- Create custom templates for different receipt types
- Add member photo integration
- Include QR codes for verification

## Maintenance

### Regular Tasks
1. **Cleanup**: Remove old PDF files periodically
2. **Backup**: Include PDF storage in backups
3. **Monitor**: Check storage space usage
4. **Update**: Keep TCPDF library updated

### Log Files
- Check error logs regularly
- Monitor PDF generation statistics
- Track file access patterns

## Support

For technical support or questions about the PDF integration:
1. Check error logs in the system
2. Review this documentation
3. Test with provided test files
4. Contact system administrator

## Status: ✅ COMPLETED

The TCPDF integration is fully implemented and ready for production use. All components are in place and tested.

---

**Last Updated**: July 11, 2025
**Version**: 1.0
**Author**: KSO Chandigarh Development Team
