<?php
/**
 * Weld Logs to Handovers Sync Cron Job
 * 
 * This cron job synchronizes data from weld_logs table to handovers table
 * using chunk processing and database transactions for better performance and reliability.
 */

try {
    // Configuration
    $chunkSize = 1000; // Process records in chunks to avoid memory issues
    $batchSize = 100;   // Process database operations in smaller batches

    // Get base column from settings
    $handOverZoneColumn = setting('hand_over_zone_column') ?? "line_number";

    // Statistics tracking
    $stats = [
        'total_processed' => 0,
        'handovers_created' => 0,
        'handovers_updated' => 0,
        'errors' => 0,
        'start_time' => microtime(true)
    ];

    echo "=== Weld Logs to Handovers Sync Started ===\n";
    echo "Time: " . now() . "\n\n";

    // Get total count for progress tracking
    $totalRecords = db("weld_logs")->count();
    echo "Total weld_logs records to process: {$totalRecords}\n\n";

    // Process in chunks to avoid memory issues
    db("weld_logs")
        ->select($handOverZoneColumn, 'project', 'design_area', 'piping_type')
        ->distinct()
        ->orderBy($handOverZoneColumn) // Laravel chunk() için orderBy gerekli
        ->chunk($chunkSize, function ($weldLogs) use (&$stats, $batchSize, $handOverZoneColumn) {

            // Group by base column to avoid duplicates
            $uniqueLines = [];
            foreach ($weldLogs as $weldLog) {
                $baseValue = $weldLog->{$handOverZoneColumn};
                if (!empty($baseValue)) {
                    $uniqueLines[$baseValue] = $weldLog;
                }
            }

            // Process unique lines in smaller batches for database operations
            $batch = [];
            foreach ($uniqueLines as $baseValue => $weldLog) {

                $batch[] = [
                    'base_value' => $baseValue,
                    'weld_log' => $weldLog
                ];

                // Process batch when it reaches batch size
                if (count($batch) >= $batchSize) {
                    processBatch($batch, $stats);
                    $batch = [];
                }
            }

            // Process remaining records in the last batch
            if (!empty($batch)) {
                processBatch($batch, $stats);
            }

            $stats['total_processed'] += count($uniqueLines);

            // Progress update
            echo "Processed chunk: " . count($uniqueLines) . " unique lines\n";
        });

    // Final statistics
    $executionTime = round(microtime(true) - $stats['start_time'], 2);

    echo "\n=== Sync Completed ===\n";
    echo "Total processed: {$stats['total_processed']}\n";
    echo "Handovers created: {$stats['handovers_created']}\n";
    echo "Handovers updated: {$stats['handovers_updated']}\n";
    echo "Errors: {$stats['errors']}\n";
    echo "Execution time: {$executionTime} seconds\n";
    echo "Time: " . now() . "\n";

} catch (Exception $e) {
    echo "CRITICAL ERROR: " . $e->getMessage() . "\n";
    echo "Stack trace: " . $e->getTraceAsString() . "\n";
    exit(1);
}

/**
 * Process a batch of weld logs to create/update handovers
 */
function processBatch($batch, &$stats)
{
    try {
        // Use database transaction for batch operations
        \DB::beginTransaction();

        foreach ($batch as $item) {
            $baseValue = $item['base_value'];
            $weldLog = $item['weld_log'];

            try {
                // Prepare handover data
                $handoverData = [
                    'project' => $baseValue,            // base column -> project (location)
                    'object' => $weldLog->project ?? '', // project -> object
                    'location' => $weldLog->design_area ?? '', // design_area -> location
                    'work_type' => 'ТРУБКА', // piping_type -> work_type
                    'status1' => 'In Progress',
                    'updated_at' => now()
                ];

                // Check if handover record exists
                $existingHandover = db("handovers")
                    ->where('project', $baseValue)
                    ->first();

                if ($existingHandover) {
                    // Update existing record
                    db("handovers")
                        ->where('id', $existingHandover->id)
                        ->update($handoverData);

                    $stats['handovers_updated']++;

                } else {
                    // Create new record
                    $handoverData['created_at'] = now();
                    $handoverData['final_status'] = 'Waiting';
                    db("handovers")->insert($handoverData);

                    $stats['handovers_created']++;
                }

            } catch (Exception $e) {
                $stats['errors']++;
                echo "Error processing base value {$baseValue}: " . $e->getMessage() . "\n";
                continue; // Continue with next record instead of failing entire batch
            }
        }

        // Commit transaction if all operations successful
        \DB::commit();

    } catch (Exception $e) {
        // Rollback transaction on error
        \DB::rollBack();
        $stats['errors']++;
        echo "Batch processing error: " . $e->getMessage() . "\n";
        throw $e; // Re-throw to be caught by main try-catch
    }
}
?>