<?php

namespace App\Services\RegisterCreator\DocumentProcessors;

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

class TemplateProcessor extends AbstractDocumentProcessor
{
    /**
     * Process template type documents
     */
    public function process(
        array $weldLogData,
        array $document,
        Worksheet $sheet,
        int &$currentRow,
        array $settings
    ): int {
        $this->initialize($weldLogData, $document, $sheet, $currentRow, $settings);
        
        $this->log("Processing Template document: {$document['path']}");
        
        $lineIdentifier = $weldLogData[$this->registerColumnBased];
        
        // Search by line number
        $normalized1 = $this->normalizeSearchTerm($lineIdentifier);
        $search1 = $this->searchFiles("storage/documents/{$document['path']}/*{$normalized1}*.pdf");
        
        // Search by test package numbers
        $testPackageNumbers = db("weld_logs")
            ->where($this->registerColumnBased, $lineIdentifier)
            ->whereNotNull("test_package_no")
            ->where("test_package_no", "!=", "")
            ->distinct()
            ->pluck("test_package_no")
            ->toArray();
        
        $this->log("Found " . count($testPackageNumbers) . " test package numbers for search");
        
        $search2 = [];
        foreach ($testPackageNumbers as $testPackageNo) {
            $normalized2 = $this->normalizeSearchTerm($testPackageNo);
            $result = $this->searchFiles("storage/documents/{$document['path']}/*{$normalized2}*.pdf");
            if (!empty($result)) {
                $search2 = array_merge($search2, $result);
            }
        }
        
        // Merge and remove duplicates
        $allFiles = array_unique(array_merge($search1, $search2));
        $this->log("Total files found: " . count($allFiles));
        
        if (empty($allFiles)) {
            $this->log("No template files found", 'warning');
            return $currentRow;
        }
        
        // Sort files by date extracted from filename (oldest first)
        // Note: Excel rows are inserted in reverse (insertNewRowBefore),
        // so oldest first becomes newest last in Excel (correct order)
        $self = $this;
        usort($allFiles, function($a, $b) use ($self) {
            $dateA = strtotime($self->extractDateFromFilename(basename($a))) ?: 0;
            $dateB = strtotime($self->extractDateFromFilename(basename($b))) ?: 0;
            
            // Sort ascending (oldest first)
            return $dateA <=> $dateB;
        });
        
        $this->log("Files sorted by date (oldest first for reverse insertion)");
        
        foreach ($allFiles as $filePath) {
            try {
                $fileName = basename($filePath);
                $documentDate = $this->extractDateFromFilename($fileName);
                
                // Process single file
                $templateFileName = str_replace(".pdf", "", $fileName);
                $lineNumber = $templateFileName;
                $document['title2'] = $templateFileName;
                
                // Remove date from filename
                $templateFileName = preg_replace('/_\d{2}\.\d{2}\.\d{4}/', '', $templateFileName);
                $templateFileName = preg_replace('/_\d{4}-\d{2}-\d{2}/', '', $templateFileName);
                $document['templateFileName'] = $templateFileName;
                
                // Special handling for Incoming_Control
                if ($document['id'] == "Incoming_Control") {
                    $incomingControl = db("incoming_controls")
                        ->where("certificate_no", $lineNumber)
                        ->first();
                    
                    if ($incomingControl) {
                        $document['title2'] = $incomingControl->description_ru;
                        $this->log("Incoming Control found: {$document['title2']}");
                    }
                }
                
                // Update document reference for current iteration
                $this->document = $document;
                
                $newRow = $this->addRowToExcel(
                    [$filePath],
                    $lineNumber,
                    $documentDate
                );
                
                if ($newRow > $currentRow) {
                    $currentRow = $newRow;
                }
            } catch (\Throwable $th) {
                $this->log("Error processing template file: " . basename($filePath) . " - {$th->getMessage()}", 'error');
                continue;
            }
        }
        
        return $currentRow;
    }
    
    /**
     * Extract date from filename
     */
    private function extractDateFromFilename(string $fileName): string
    {
        // Try YYYY-MM-DD format
        if (preg_match('/(\d{4}-\d{2}-\d{2})/', $fileName, $matches)) {
            return $matches[1];
        }
        
        // Try DD.MM.YYYY format
        if (preg_match('/(\d{2}\.\d{2}\.\d{4})/', $fileName, $matches)) {
            try {
                return Carbon::createFromFormat('d.m.Y', $matches[1])->format('Y-m-d');
            } catch (\Throwable $th) {
                Log::debug("Could not parse date: {$matches[1]}");
            }
        }
        
        // Default to latest date
        $placeholderReplacer = new \App\Services\RegisterCreator\PlaceholderReplacer();
        return $placeholderReplacer->getLatestDate($this->weldLogData, $this->registerColumnBased);
    }
}