# ExcelRowHandler Service Guide

## Overview

The `ExcelRowHandler` service is a modern, object-oriented replacement for the `addRowInTable` helper function. It provides a clean and maintainable way to add formatted rows to Excel sheets in the Register Creator system.

## Location

- **Service Class**: `App\Services\RegisterCreator\ExcelRowHandler`
- **Integration**: `App\Services\RegisterCreator\DocumentProcessors\AbstractDocumentProcessor`

## Features

- ✅ **Duplicate Detection**: Automatically prevents duplicate report entries
- ✅ **File Management**: Handles PDF and XLSX file copying with smart overwrite logic
- ✅ **Page Counting**: Automatically counts PDF pages using pdftk
- ✅ **Excel Formatting**: Preserves styles, formulas, merged cells, and row heights
- ✅ **Comprehensive Logging**: Provides detailed logging with emoji indicators
- ✅ **Statistics Tracking**: Tracks file types and successful operations
- ✅ **Type Safety**: Full PHP type hints for better IDE support and error prevention

## Architecture

### Service Class: ExcelRowHandler

The main service class handles all row addition operations:

```php
use App\Services\RegisterCreator\ExcelRowHandler;

$handler = new ExcelRowHandler();

$newRow = $handler->addRow(
    $search,              // Array of file paths to search
    $selectDocument,      // Document information array
    $fullFolder,          // Target folder path
    $lineNumber,          // Line identifier
    $documentDate,        // Document date
    $rowNo,              // Row sequence number
    $sheet,              // PhpSpreadsheet Worksheet object
    $currentRow,         // Current row position
    $override            // Whether to overwrite existing files
);
```

### Integration with AbstractDocumentProcessor

The service is integrated into `AbstractDocumentProcessor` for easy use in all document processors:

```php
protected function addRowToExcel(
    array $search,
    string $lineNumber,
    string $documentDate,
    int $rowNo
): int
```

## Usage in Document Processors

### Basic Usage Example

Here's how to use the service in a document processor:

```php
class MyDocumentProcessor extends AbstractDocumentProcessor
{
    public function process(
        array $weldLogData,
        array $document,
        Worksheet $sheet,
        int &$currentRow,
        array $settings
    ): int {
        // Initialize processor (this creates the ExcelRowHandler instance)
        $this->initialize($weldLogData, $document, $sheet, $currentRow, $settings);
        
        // Get line identifier
        $lineIdentifier = $weldLogData[$this->registerColumnBased];
        
        // Search for files
        $search = $this->searchFiles("{$document['path']}/*{$lineIdentifier}*.pdf");
        
        // Get document date
        $placeholderReplacer = new \App\Services\RegisterCreator\PlaceholderReplacer();
        $documentDate = $placeholderReplacer->getLatestDate($weldLogData, $this->registerColumnBased);
        
        // Add row to Excel using the service
        $newRow = $this->addRowToExcel(
            $search,
            $lineIdentifier,
            $documentDate,
            1  // Row number in sequence
        );
        
        if ($newRow > $currentRow) {
            $currentRow = $newRow;
        }
        
        return $currentRow;
    }
}
```

### Real Example: DrawingsProcessor

```php
class DrawingsProcessor extends AbstractDocumentProcessor
{
    public function process(
        array $weldLogData,
        array $document,
        Worksheet $sheet,
        int &$currentRow,
        array $settings
    ): int {
        $this->initialize($weldLogData, $document, $sheet, $currentRow, $settings);
        
        $this->log("Processing Drawings");
        
        $lineIdentifier = $weldLogData[$this->registerColumnBased];
        $normalized = $this->normalizeSearchTerm($lineIdentifier);
        $search = $this->searchFiles("{$document['path']}/*{$normalized}*.pdf");
        
        $placeholderReplacer = new \App\Services\RegisterCreator\PlaceholderReplacer();
        $documentDate = $placeholderReplacer->getLatestDate($weldLogData, $this->registerColumnBased);
        
        // Use the new ExcelRowHandler service method
        $newRow = $this->addRowToExcel(
            $search,
            $lineIdentifier,
            $documentDate,
            1
        );
        
        if ($newRow > $currentRow) {
            $currentRow = $newRow;
        }
        
        return $currentRow;
    }
}
```

## Method Parameters

### addRow() Method

| Parameter | Type | Description |
|-----------|------|-------------|
| `$search` | `array` | Array of file paths to search for |
| `$selectDocument` | `array` | Document information containing title, path, type, order, etc. |
| `$fullFolder` | `string` | Target folder path (e.g., "storage/documents/project/line/") |
| `$lineNumber` | `string` | Line number or identifier |
| `$documentDate` | `string` | Document date |
| `$rowNo` | `int` | Row sequence number |
| `$sheet` | `Worksheet` | PhpSpreadsheet Worksheet object (passed by reference) |
| `$currentRow` | `int` | Current row position in Excel |
| `$override` | `bool` | Whether to overwrite existing files (default: false) |

**Returns**: `int` - Next row position

### addRowToExcel() Helper Method

| Parameter | Type | Description |
|-----------|------|-------------|
| `$search` | `array` | Array of file paths to search for |
| `$lineNumber` | `string` | Line number or identifier |
| `$documentDate` | `string` | Document date |
| `$rowNo` | `int` | Row sequence number |

**Returns**: `int` - Next row position

## Document Information Structure

The `$selectDocument` array should contain:

```php
[
    'title1' => 'Main title',
    'title2' => 'NDT Report Number',
    'title3' => 'PDF Document Title',
    'title4' => 'NDT Register Title',
    'path' => 'storage/documents/...',
    'type' => 'drawing|template|...',
    'order' => 0,  // Display order
    'file_name' => 'Custom file name (optional)',
    'incoming_control_description' => 'Description (optional)'
]
```

## Excel Template Placeholders

The service replaces the following placeholders in the Excel template:

| Placeholder | Description |
|-------------|-------------|
| `{rowNo}` | Row sequence number |
| `{type_order_no}` | Document type order number (e.g., 1 for QA, 2 for WDB) |
| `{sub_number}` | Sub-number within document type (1, 2, 3...) |
| `{full_number}` | Combined number in format "type_order_no.sub_number" (e.g., "1.1", "1.2", "3.1") |
| `{rowTitle}` | Document title (processed) |
| `{documentReportNumber}` | Line number/identifier |
| `{documentDate}` | Formatted document date |
| `{constructor}` | Contractor name |
| `{pageCount}` | Number of pages in PDF |
| `{pageIndex}` | Page range (e.g., "1-3") |
| `{title1}` | Document title 1 |
| `{ndt_report_no}` | NDT report number (title2) |
| `{pdf_document_title}` | PDF document title (title3) |
| `{ndt_register_title}` | NDT register title (title4) |

## Log Format

The service generates structured logs with emoji indicators:

```
📋 1. Document Title - LINE001 | 1 file(s)
   -- filename.pdf
   📁 File: copied
   
📋 2. Another Document - LINE002 | 2 file(s)
   -- document1.pdf
   -- document2.pdf
   📁 File: updated
   📊 XLSX: copied

❌ 3. Missing Document - LINE003 | NO FILES FOUND
   Search paths:
   -- expected_filename.pdf

🔄 DUPLICATE: Report Title - LINE001
```

### Log Indicators

- 📋 = Document processed
- ✅ = Success
- ❌ = Error or not found
- 🔄 = Duplicate (skipped)
- 📁 = PDF file operation
- 📊 = XLSX file operation
- ❓ = Warning or missing optional file

### File Copy Status

- `copied` = New file copied
- `updated` = File content changed, updated
- `overwritten` = File forcefully overwritten (override=true)
- `same content, skipped` = File exists with same content, no action needed

## File Management

### PDF Files

All PDF files are automatically:
1. Validated for existence
2. Page counted using pdftk
3. Copied to target location
4. Named according to order and title

### XLSX Files (Templates)

For documents with type="template":
1. Searches for corresponding .xlsx file
2. Copies alongside PDF if found
3. Logs result (found/not found)

### Smart Copy Logic

The service uses MD5 hash comparison to avoid unnecessary file operations:
- If file exists and content is identical → skip
- If file exists and content differs → update
- If override flag is true → always overwrite

## Statistics

The service tracks statistics that can be accessed statically:

```php
// Get file type statistics
$stats = ExcelRowHandler::getFileTypeStats();
// Returns: ['pdf' => 150, 'xlsx' => 25, ...]

// Get successful operations count
$count = ExcelRowHandler::getSuccessfulOperations();
// Returns: 150

// Reset statistics
ExcelRowHandler::resetStatistics();
```

## Duplicate Prevention

The service automatically prevents duplicate entries based on:
- Document title (title2)
- Line number

If a duplicate is detected:
1. Row is skipped
2. Duplicate log is written
3. Original row position is returned (no increment)

## Error Handling

The service handles errors gracefully:

```php
try {
    $newRow = $this->addRowToExcel($search, $lineNumber, $documentDate, 1);
} catch (\Throwable $th) {
    // Error is logged automatically
    // Exception is re-thrown for upstream handling
}
```

### Error Logging

All errors are logged to:
1. Laravel log (with context)
2. Project-specific log.txt file
3. Console output

## Cache Dependencies

The service relies on cached values:

| Cache Key | Description |
|-----------|-------------|
| `rc_contractor` | Contractor name |
| `rc_firstPage` | First page number |
| `rc_lastPage` | Last page number |
| `rc_template_row` | Template row number |

These are managed by `RegisterCreatorService`.

## Migration from addRowInTable Helper

### Old Way (Helper Function)

```php
$newRow = addRowInTable(
    $search,
    $document,
    $this->getFullFolder(),
    $lineIdentifier,
    $documentDate,
    1,
    $this->sheet,
    $currentRow,
    $this->settings['override'] ?? true
);
```

### New Way (Service Method)

```php
$newRow = $this->addRowToExcel(
    $search,
    $lineIdentifier,
    $documentDate,
    1
);
```

### Benefits of Migration

1. **Cleaner Code**: Less parameters, more intuitive
2. **Better Testability**: Service can be mocked and tested
3. **Type Safety**: Full type hints
4. **Object-Oriented**: Follows SOLID principles
5. **Easier Maintenance**: All logic in one place
6. **Better IDE Support**: Autocomplete and hints

## Best Practices

### 1. Always Initialize

```php
$this->initialize($weldLogData, $document, $sheet, $currentRow, $settings);
```

This creates the ExcelRowHandler instance and sets up necessary properties.

### 2. Update Current Row

```php
$newRow = $this->addRowToExcel(...);

if ($newRow > $currentRow) {
    $currentRow = $newRow;
}
```

Always check if row was actually added before updating position.

### 3. Handle Search Results

```php
$search = $this->searchFiles("{$document['path']}/*{$normalized}*.pdf");

if (empty($search)) {
    $this->log("No files found for pattern", "warning");
    return $currentRow;
}
```

Check if files exist before calling addRowToExcel.

### 4. Use Normalized Search Terms

```php
$normalized = $this->normalizeSearchTerm($lineIdentifier);
$search = $this->searchFiles("{$document['path']}/*{$normalized}*.pdf");
```

Normalize search terms for better file matching.

### 5. Log Processing Steps

```php
$this->log("Processing Drawings");
$newRow = $this->addRowToExcel(...);
$this->log("Drawings processed successfully");
```

Use the log() method for consistent logging.

## Troubleshooting

### Files Not Found

1. Check file paths in search array
2. Verify storage permissions
3. Check if files exist in expected location
4. Review log.txt for exact search paths

### Duplicate Detection Issues

1. Check title2 field consistency
2. Verify line number format
3. Reset statistics if testing: `ExcelRowHandler::resetStatistics()`

### Page Count Issues

1. Ensure pdftk is installed: `which pdftk`
2. Check LANG environment variable
3. Verify PDF file is not corrupted

### Excel Formatting Issues

1. Verify template row is set correctly
2. Check placeholder names match exactly
3. Ensure template has proper merged cells

## Performance Considerations

1. **File Operations**: Uses Laravel Storage for efficiency
2. **MD5 Comparison**: Only calculates when necessary
3. **Static Properties**: Shared across instances for statistics
4. **Lazy Loading**: PDFs only opened when needed

## Testing

Example test structure:

```php
use Tests\TestCase;
use App\Services\RegisterCreator\ExcelRowHandler;

class ExcelRowHandlerTest extends TestCase
{
    public function test_adds_row_successfully()
    {
        $handler = new ExcelRowHandler();
        
        // Setup test data
        $search = ['storage/documents/test.pdf'];
        $document = ['title2' => 'Test', 'order' => 0, ...];
        
        // Execute
        $newRow = $handler->addRow(
            $search,
            $document,
            'storage/documents/test/',
            'LINE001',
            '2024-01-01',
            1,
            $this->mockSheet,
            10,
            false
        );
        
        // Assert
        $this->assertEquals(11, $newRow);
    }
}
```

## Related Documentation

- [Register Creator Guide](./register-creator-guide.md)
- [Save Trigger System Guide](./save-trigger-system-guide.md)
- [Document Processors](./document-processors-guide.md)

## Version History

- **v1.0** (2024-10): Initial release
  - Migrated from addRowInTable helper function
  - Added full type hints
  - Improved error handling
  - Added statistics tracking