# Print Timestamp Implementation - Streamline System

## Overview
This document outlines the implementation of the "Printed on" timestamp functionality across all print functions in the Streamline system. The functionality automatically adds a timestamp showing when a document was printed, providing audit trails and document tracking.

## What Was Implemented

### 1. Centralized JavaScript Function
- **File**: `public/assets/js/print-utils.js`
- **Function**: `printWithTimestamp(containerId = 'printTimestampContainer')`
- **Features**:
  - Automatically adds timestamp before printing
  - Creates timestamp container if it doesn't exist
  - Removes timestamp after printing
  - Backward compatible with existing `printGRN()` function

### 2. Main Layout Integration
- **File**: `resources/views/admin/layouts/app.blade.php`
- **Change**: Added `<script src="{{ asset('assets/js/print-utils.js') }}"></script>`
- **Result**: All admin pages now have access to the print timestamp functionality

### 3. Updated Files
The following files have been updated to use the new print functionality:

#### Document Show Pages
- ✅ `resources/views/admin/goods-receivings/show.blade.php` (already had functionality)
- ✅ `resources/views/admin/credit-notes/show.blade.php`
- ✅ `resources/views/admin/store-issue-requisition/show.blade.php`
- ✅ `resources/views/admin/salary_sheet/show.blade.php`
- ✅ `resources/views/admin/journal-vouchers/show.blade.php`
- ✅ `resources/views/admin/receipt-vouchers/show.blade.php`
- ✅ `resources/views/admin/sales-returns/show.blade.php`
- ✅ `resources/views/admin/finished-goods-receivings/show.blade.php`
- ✅ `resources/views/admin/rejection-return-notes/show.blade.php`
- ✅ `resources/views/admin/left-over-notes/show.blade.php`
- ✅ `resources/views/admin/payment-vouchers/show.blade.php`
- ✅ `resources/views/admin/purchase-requisitions/show.blade.php`
- ✅ `resources/views/admin/sale-invoice/show.blade.php`
- ✅ `resources/views/admin/sale-invoice/warranty.blade.php`
- ✅ `resources/views/admin/purchase-invoice/show.blade.php`

#### Report Pages
- ✅ `resources/views/admin/reports/purchase-requisitions.blade.php`
- ✅ `resources/views/admin/reports/financial-ledger.blade.php`
- ✅ `resources/views/admin/reports/bin-card.blade.php`
- ✅ `resources/views/admin/reports/production-report.blade.php`
- ✅ `resources/views/admin/reports/customer-aging.blade.php`
- ✅ `resources/views/admin/reports/product-variant-batch-report.blade.php`
- ✅ `resources/views/admin/reports/batch-report.blade.php`
- ✅ `resources/views/admin/reports/franchiser-sales.blade.php`
- ✅ `resources/views/admin/reports/country-quantity-sales.blade.php`
- ✅ `resources/views/admin/reports/country-amount-sales.blade.php`
- ✅ `resources/views/admin/reports/purchase-items.blade.php`
- ✅ `resources/views/admin/reports/costing-voucher.blade.php`
- ✅ `resources/views/admin/reports/batch-track-report.blade.php`
- ✅ `resources/views/admin/reports/requirement-report.blade.php`
- ✅ `resources/views/admin/reports/consumption-report.blade.php`
- ✅ `resources/views/admin/reports/balance-report.blade.php`

## How It Works

### 1. Print Button Click
When a user clicks any print button, it now calls `printWithTimestamp()` instead of `window.print()`.

### 2. Timestamp Addition
The function automatically:
- Creates a timestamp container if it doesn't exist
- Adds the current date and time in British format (dd/mm/yyyy, hh:mm:ss)
- Formats: "**Printed on:** 15/01/2025, 14:30:25"

### 3. Print Execution
- Executes `window.print()`
- Timestamp appears on the printed document

### 4. Cleanup
- Removes the timestamp after printing
- Container remains for future use

## Technical Details

### JavaScript Function
```javascript
function printWithTimestamp(containerId = 'printTimestampContainer') {
    // Add timestamp to footer before printing
    const timestampContainer = document.getElementById(containerId);
    
    // Create timestamp div if container doesn't exist
    if (!timestampContainer) {
        const newContainer = document.createElement('div');
        newContainer.id = containerId;
        newContainer.style.cssText = 'text-align: center; margin-top: 20px; font-size: 14px; color: #666;';
        document.body.appendChild(newContainer);
    }
    
    const timestampDiv = document.createElement('div');
    timestampDiv.style.cssText = 'text-align: center; margin-top: 20px; font-size: 14px; color: #666;';
    timestampDiv.innerHTML = '<strong>Printed on:</strong> ' + new Date().toLocaleString('en-GB');
    
    // Clear any existing timestamp and add new one
    const container = document.getElementById(containerId);
    container.innerHTML = '';
    container.appendChild(timestampDiv);
    
    // Print
    window.print();
    
    // Remove timestamp after printing
    setTimeout(() => {
        container.innerHTML = '';
    }, 1000);
}
```

### HTML Structure Added
Each document now includes:
```html
<!-- Print timestamp will be added here -->
<div id="printTimestampContainer"></div>
```

### CSS Styling
The timestamp is styled with:
- Center alignment
- 20px top margin
- 14px font size
- Gray color (#666)
- Bold "Printed on:" label

## Benefits

1. **Audit Trail**: Every printed document shows when it was printed
2. **Document Tracking**: Users can track when documents were accessed/printed
3. **Compliance**: Helps with regulatory and audit requirements
4. **Consistency**: All documents across the system now have the same print behavior
5. **Maintainability**: Centralized function makes future updates easier

## Usage

### For Users
- Simply click any print button as usual
- The timestamp will automatically appear on the printed document
- No additional steps required

### For Developers
- All print buttons now use `printWithTimestamp()`
- Timestamp containers are automatically added to all documents
- Function is globally available through the main layout

## Future Enhancements

1. **Custom Timestamp Formats**: Allow different date/time formats
2. **User Information**: Include user who printed the document
3. **Print History**: Log all print operations for audit purposes
4. **Custom Styling**: Allow different timestamp styles per document type

## Testing

To test the functionality:
1. Navigate to any document show page or report
2. Click the print button
3. Verify the timestamp appears on the printed document
4. Check that the timestamp shows the current date and time

## Notes

- The implementation is backward compatible
- Existing `printGRN()` function still works
- All print functions across the system now have consistent behavior
- Timestamp is automatically removed after printing to keep the UI clean
