<?php

namespace App\Services\RegisterCreator\DocumentProcessors;

use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\DB;

class DynamicMappingProcessor extends AbstractDocumentProcessor
{
    public function process(
        array $weldLogData,
        array $document,
        Worksheet $sheet,
        int &$currentRow,
        array $settings
    ): int {
        $this->initialize($weldLogData, $document, $sheet, $currentRow, $settings);
        
        $this->log("Processing dynamic mapped document: {$document['title2']}");
        
        // Check if this document has SQL query configuration
        if (empty($document['sql_query'])) {
            $this->log("No SQL query found for dynamic document", 'warning');
            return $currentRow;
        }
        
        return $this->processSqlBasedMapping($currentRow);
    }
    
    private function processSqlBasedMapping(int &$currentRow): int
    {
        try {
            // Execute SQL query with placeholder replacement
            $results = $this->executeSqlQuery();
            
            if (empty($results)) {
                $this->log("SQL query returned no results", 'warning');
                return $currentRow;
            }
            
            $this->log("Found " . count($results) . " records from SQL query");
            
            // Process each result
            foreach ($results as $result) {
                try {
                    $identifier = $result['identifier'];
                    $recordData = $result['data'];
                    $documentDate = $result['document_date'];
                    
                    // Generate row title using pattern
                    $rowTitle = $this->generateRowTitle($recordData);
                    
                    // Generate file search pattern
                    $searchPattern = $this->generateFileSearchPattern($recordData);
                    $fullPath = "storage/documents/{$this->document['path']}/{$searchPattern}";
                    
                    // Search for files
                    $files = $this->searchFiles($fullPath);
                    
                    if (empty($files)) {
                        $this->log("No files found for: {$identifier} (pattern: {$searchPattern})", 'warning');
                        continue;
                    }
                    
                    $this->log("✓ Found " . count($files) . " files for: {$identifier}");
                    
                    // Update document titles
                    $this->document['title2'] = $identifier;
                    $this->document['title4'] = $rowTitle;
                    
                    // Add row to Excel
                    $newRow = $this->addRowToExcel(
                        $files,
                        $identifier,
                        $documentDate
                    );
                    
                    if ($newRow > $currentRow) {
                        $currentRow = $newRow;
                    }
                    
                    $this->log("✓ Processed: {$identifier} (from SQL query)");
                    
                } catch (\Throwable $th) {
                    $this->log("Error processing SQL result: {$th->getMessage()}", 'error');
                    Log::error("Dynamic mapping result processing error", [
                        'identifier' => $result['identifier'] ?? 'unknown',
                        'error' => $th->getMessage(),
                        'trace' => $th->getTraceAsString()
                    ]);
                    continue;
                }
            }
            
            return $currentRow;
            
        } catch (\Throwable $th) {
            $this->log("SQL query execution error: {$th->getMessage()}", 'error');
            Log::error("Dynamic mapping SQL execution error", [
                'sql_query' => $this->document['sql_query'] ?? 'N/A',
                'error' => $th->getMessage(),
                'trace' => $th->getTraceAsString()
            ]);
            throw $th;
        }
    }
    
    /**
     * Execute SQL query with placeholder replacement
     */
    private function executeSqlQuery(): array
    {
        $sqlQuery = $this->document['sql_query'] ?? '';
        
        if (empty($sqlQuery)) {
            throw new \Exception("No SQL query defined for dynamic document");
        }
        
        // Replace placeholders
        $executedQuery = $this->replacePlaceholders($sqlQuery);
        
        Log::info("Executing dynamic SQL query", [
            'original_query' => $sqlQuery,
            'executed_query' => $executedQuery
        ]);
        
        try {
            $startTime = microtime(true);
            $results = DB::select($executedQuery);
            $executionTime = round((microtime(true) - $startTime) * 1000, 2);
            
            Log::info("Dynamic SQL query executed successfully", [
                'record_count' => count($results),
                'execution_time' => $executionTime . 'ms'
            ]);
            
            return $this->formatResults($results);
            
        } catch (\Throwable $th) {
            Log::error("Dynamic SQL query execution failed", [
                'query' => $executedQuery,
                'error' => $th->getMessage()
            ]);
            
            throw $th;
        }
    }
    
    /**
     * Replace :placeholder with actual values from register data
     */
    private function replacePlaceholders(string $query): string
    {
        $result = $query;
        
        // Find all :placeholder patterns
        preg_match_all('/:(\w+)/', $query, $matches);
        
        foreach ($matches[1] as $placeholder) {
            $value = $this->weldLogData[$placeholder] ?? null;
            
            if ($value !== null) {
                // Escape value for SQL
                $escapedValue = DB::getPdo()->quote($value);
                $result = str_replace(":{$placeholder}", $escapedValue, $result);
            } else {
                Log::warning("Placeholder value not found", [
                    'placeholder' => $placeholder,
                    'available_fields' => array_keys($this->weldLogData)
                ]);
            }
        }
        
        return $result;
    }
    
    /**
     * Format SQL results to standard structure
     */
    private function formatResults(array $results): array
    {
        $identifierField = $this->document['identifier_field'] ?? 'identifier';
        $dateField = $this->document['date_field'] ?? 'document_date';
        
        $formatted = [];
        
        foreach ($results as $result) {
            $recordArray = (array) $result;
            
            $identifier = $recordArray[$identifierField] ?? $recordArray['id'] ?? 'unknown';
            $date = $recordArray[$dateField] ?? '';
            
            $formatted[] = [
                'identifier' => $identifier,
                'document_date' => $date,
                'data' => $recordArray
            ];
        }
        
        return $formatted;
    }
    
    /**
     * Generate file search pattern with field replacements
     */
    private function generateFileSearchPattern(array $recordData): string
    {
        $pattern = $this->document['file_search_pattern'] ?? '*{identifier}*.pdf';
        
        // Replace {field_name} with actual values
        foreach ($recordData as $key => $value) {
            $pattern = str_replace("{{$key}}", $value, $pattern);
        }
        
        return $pattern;
    }
    
    /**
     * Generate row title with pattern
     */
    private function generateRowTitle(array $recordData): string
    {
        $pattern = $this->document['title4_pattern'] ?? '{identifier}';
        
        // Replace {field_name} with actual values
        foreach ($recordData as $key => $value) {
            $pattern = str_replace("{{$key}}", $value, $pattern);
        }
        
        return $pattern;
    }
}