<?php

namespace App\Jobs;

use App\Models\DhlShipment;
use App\Services\DhlApiService;
use Exception;
use Illuminate\Bus\Queueable as BusQueueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
use Illuminate\Support\Facades\Log;

/**
 * Job to track DHL shipments asynchronously
 * 
 * This job handles the tracking of DHL shipments in the background,
 * updating tracking status and details automatically.
 */
class TrackShipmentJob implements ShouldQueue
{
    use BusQueueable, Dispatchable, InteractsWithQueue, SerializesModels;

    /**
     * @var DhlShipment
     */
    public $dhlShipment;

    /**
     * @var array
     */
    public $options;

    /**
     * The number of times the job may be attempted.
     *
     * @var int
     */
    public $tries = 2; // Lower tries for tracking as it's less critical

    /**
     * The maximum number of seconds the job can run before timing out.
     *
     * @var int
     */
    public $timeout = 60;

    /**
     * Create a new job instance.
     *
     * @param DhlShipment $dhlShipment
     * @param array $options
     */
    public function __construct(DhlShipment $dhlShipment, array $options = [])
    {
        $this->dhlShipment = $dhlShipment;
        $this->options = $options;
        
        // Set queue name - tracking is usually lower priority
        $this->onQueue('dhl-tracking');
    }

    /**
     * Execute the job.
     */
    public function handle(): void
    {
        try {
            Log::info('[DHL Queue] Starting shipment tracking job', [
                'shipment_id' => $this->dhlShipment->id,
                'tracking_number' => $this->dhlShipment->tracking_number,
                'attempt' => $this->attempts(),
            ]);

            $dhlService = new DhlApiService();

            // Get tracking details
            $trackingDetails = $dhlService->getTrackingDetails($this->dhlShipment);

            Log::info('[DHL Queue] Shipment tracking updated successfully', [
                'shipment_id' => $this->dhlShipment->id,
                'tracking_status' => $trackingDetails['status'] ?? 'unknown',
                'events_count' => isset($trackingDetails['events']) ? count($trackingDetails['events']) : 0,
            ]);

            // Schedule next tracking update if shipment is still in transit
            if (isset($this->options['auto_retrack']) && $this->options['auto_retrack']) {
                $status = $trackingDetails['status'] ?? '';
                if ($this->shouldContinueTracking($status)) {
                    // Schedule next tracking in 2-6 hours based on current status
                    $nextTrackingDelay = $this->getNextTrackingDelay($status);
                    TrackShipmentJob::dispatch($this->dhlShipment, $this->options)
                        ->delay(now()->addMinutes($nextTrackingDelay));
                    
                    Log::info('[DHL Queue] Next tracking job scheduled', [
                        'shipment_id' => $this->dhlShipment->id,
                        'delay_minutes' => $nextTrackingDelay,
                    ]);
                }
            }

        } catch (Exception $e) {
            Log::warning('[DHL Queue] Shipment tracking failed', [
                'shipment_id' => $this->dhlShipment->id,
                'tracking_number' => $this->dhlShipment->tracking_number,
                'error' => $e->getMessage(),
                'attempt' => $this->attempts(),
                'max_tries' => $this->tries,
            ]);

            // For tracking, we don't necessarily need to fail hard
            if ($this->attempts() >= $this->tries) {
                Log::warning('[DHL Queue] Shipment tracking permanently failed', [
                    'shipment_id' => $this->dhlShipment->id,
                    'error' => $e->getMessage(),
                ]);
                
                // Don't re-throw for final attempt - just log and continue
                return;
            }

            throw $e; // Re-throw to trigger retry mechanism
        }
    }

    /**
     * Handle a job failure.
     *
     * @param Exception $exception
     */
    public function failed(Exception $exception): void
    {
        Log::warning('[DHL Queue] TrackShipmentJob permanently failed', [
            'shipment_id' => $this->dhlShipment->id,
            'tracking_number' => $this->dhlShipment->tracking_number,
            'error' => $exception->getMessage(),
        ]);

        // Tracking failures are less critical - just log them
    }

    /**
     * Determine if we should continue tracking this shipment
     *
     * @param string $status
     * @return bool
     */
    private function shouldContinueTracking(string $status): bool
    {
        $finalStates = [
            'delivered',
            'delivered_to_recipient',
            'delivered_to_pickup_location',
            'returned_to_sender',
            'cancelled',
            'lost',
        ];

        return !in_array(strtolower($status), $finalStates);
    }

    /**
     * Get delay for next tracking update based on current status
     *
     * @param string $status
     * @return int Minutes until next tracking
     */
    private function getNextTrackingDelay(string $status): int
    {
        switch (strtolower($status)) {
            case 'picked_up':
            case 'in_transit':
                return 120; // 2 hours for active shipments
            case 'out_for_delivery':
                return 60;  // 1 hour when out for delivery
            case 'exception':
            case 'failed_attempt':
                return 240; // 4 hours for problem shipments
            default:
                return 180; // 3 hours default
        }
    }

    /**
     * Determine the time at which the job should timeout.
     *
     * @return \DateTime
     */
    public function retryUntil()
    {
        return now()->addMinutes(30); // Short timeout for tracking
    }
}