<?php

namespace App\Imports;

use App\Models\Shipment;
use App\Models\ShipmentTrackingEvent;
use App\Models\Country;
use Illuminate\Support\Facades\Log;
use Maatwebsite\Excel\Concerns\ToCollection;
use Maatwebsite\Excel\Concerns\WithHeadingRow;
use Illuminate\Support\Collection;

class TrackingDataImport implements ToCollection, WithHeadingRow
{
    protected $importedEvents = 0;
    protected $skippedEvents = 0;
    protected $errors = [];
    protected $createdShipments = 0;

    public function collection(Collection $rows)
    {
        Log::info('Tracking import started', ['total_rows' => $rows->count()]);

        if ($rows->count() === 0) {
            Log::warning('No rows found');
            return;
        }

        $firstRow = $rows->first();
        Log::info('First row keys', ['keys' => $firstRow->keys()->toArray()]);
        Log::info('First row awb', ['awb' => $firstRow['awb'] ?? 'N/A']);

        foreach ($rows as $index => $row) {
            try {
                $awbNo = $this->normalizeAwb($row['awb'] ?? null);
                $eventDate = $this->normalizeDate($row['date'] ?? null);
                $eventTime = $this->normalizeTime($row['time'] ?? null);
                $eventDescription = $this->normalizeDescription($row['state'] ?? null);
                $location = $this->normalizeLocation($row['country'] ?? null);
                $deliveryStatus = $this->normalizeDeliveryStatus($row['last_state'] ?? null);

                if (!$awbNo || !$eventDate || !$eventDescription) {
                    $this->skippedEvents++;
                    continue;
                }

                $shipment = Shipment::where('awb_no', $awbNo)->first();

                if (!$shipment) {
                    $shipment = $this->createShipmentFromTrackingRow($row, $awbNo, $location);
                    $this->createdShipments++;
                }

                ShipmentTrackingEvent::create([
                    'shipment_id' => $shipment->id,
                    'event_date' => $eventDate,
                    'event_time' => $eventTime,
                    'location' => $location,
                    'event_description' => $eventDescription,
                    'delivery_status' => $deliveryStatus,
                    'source' => 'manual',
                ]);

                $this->importedEvents++;
            } catch (\Throwable $e) {
                $this->skippedEvents++;
                $this->errors[] = "Row {$index}: " . $e->getMessage();
                Log::error('Tracking import error', ['row' => $index, 'error' => $e->getMessage()]);
            }
        }

        Log::info('Tracking import completed', [
            'imported' => $this->importedEvents,
            'skipped' => $this->skippedEvents,
            'created' => $this->createdShipments,
            'errors' => count($this->errors),
        ]);
    }

    protected function createShipmentFromTrackingRow(array $row, string $awbNo, ?string $location): Shipment
    {
        $countryName = $location ? explode(' - ', $location)[0] : null;
        $country = Country::where('name', 'like', "%{$countryName}%")->first();

        $lastState = strtolower($row['last_state'] ?? '');

        $status = 'processed';
        if (str_contains($lastState, 'delivered')) $status = 'delivered';
        elseif (str_contains($lastState, 'in transit')) $status = 'in_transit';
        elseif (str_contains($lastState, 'picked')) $status = 'picked_up';
        elseif (str_contains($lastState, 'out for delivery')) $status = 'out_for_delivery';
        elseif (str_contains($lastState, 'failed')) $status = 'failed';

        $shipment = Shipment::create([
            'awb_no' => $awbNo,
            'direction' => 'export',
            'type' => 'PARCEL',
            'status' => $status,
            'weight' => 0,
            'volumetric_weight' => 0,
            'chargeable_weight' => 0,
            'shipping_price' => 0,
            'extra_service' => 0,
            'packing_cost' => 0,
            'domestic_pickup' => 0,
            'domestic_delivery' => 0,
            'warehousing_cost' => 0,
            'vat_amount' => 0,
            'discount' => 0,
            'total_fee' => 0,
            'net_dirham' => 0,
            'net_rial' => 0,
            'from_country_id' => Country::where('name', 'Iran')->first()?->id,
            'to_country_id' => $country?->id,
            'sender_name' => 'Unknown',
            'receiver_name' => 'Unknown',
        ]);

        return $shipment;
    }

    public function getImportedEvents(): int
    {
        return $this->importedEvents;
    }

    public function getSkippedEvents(): int
    {
        return $this->skippedEvents;
    }

    public function getErrors(): array
    {
        return $this->errors;
    }

    public function getCreatedShipments(): int
    {
        return $this->createdShipments;
    }

    protected function normalizeAwb($value): ?string
    {
        if (!$value) return null;
        $value = trim($value);
        return $value === '' || $value === '0' ? null : $value;
    }

    protected function normalizeDate($value): ?string
    {
        if (!$value) return null;
        
        if ($value instanceof \DateTime) {
            return $value->format('Y-m-d');
        }

        $value = trim($value);
        if ($value === '' || $value === '1899-12-31') return null;

        try {
            return date('Y-m-d', strtotime($value));
        } catch (\Throwable $e) {
            return null;
        }
    }

    protected function normalizeTime($value): ?string
    {
        if (!$value) return null;
        
        if ($value instanceof \DateTime) {
            return $value->format('H:i:s');
        }

        $value = trim($value);
        if ($value === '' || $value === '1899-12-31') return null;

        try {
            return date('H:i:s', strtotime($value));
        } catch (\Throwable $e) {
            return null;
        }
    }

    protected function normalizeDescription($value): ?string
    {
        if (!$value) return null;
        $value = trim($value);
        return $value === '' ? null : $value;
    }

    protected function normalizeLocation($value): ?string
    {
        if (!$value) return null;
        $value = trim($value);
        return $value === '' || $value === '.' ? null : $value;
    }

    protected function normalizeDeliveryStatus($value): ?string
    {
        if (!$value) return null;
        $value = trim($value);
        if ($value === '') return null;

        $statuses = [
            'processed' => 'processed',
            'picked up' => 'picked_up',
            'in transit' => 'in_transit',
            'out for delivery' => 'out_for_delivery',
            'failed' => 'failed',
            'delivered' => 'delivered',
            'returned' => 'returned',
        ];

        $lower = strtolower($value);
        foreach ($statuses as $key => $status) {
            if (str_contains($lower, $key)) {
                return $status;
            }
        }

        return null;
    }
}