<?php

namespace App\Services;

use App\Enums\ShipmentType;
use App\Models\Shipment;
use App\Models\ShipmentItem;
use Dompdf\Dompdf;
use Dompdf\Options;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Log;
use Picqer\Barcode\BarcodeGeneratorPNG;

class PdfService
{
    /**
     * تولید AWB PDF (برای همه نوع محموله‌ها)
     */
    public function awb(Shipment $shipment): string
    {
        $shipment->loadMissing(['fromCountry', 'toCountry', 'items']);

        $data = [
            'shipment' => $shipment,
            'shipper' => $this->formatAddress($shipment, 'sender'),
            'receiver' => $this->formatAddress($shipment, 'receiver'),
            'items' => $shipment->items ?? collect(),
            'invoice_total_usd' => optional($shipment->items)->sum('total_usd') ?? 0,
            'barcode_base64' => $this->generateBarcode($shipment->awb_no),
            'service_label' => $this->getServiceLabel($shipment),
            'type_label' => $this->getTypeLabel($shipment),
        ];

        $html = view('pdfs.awb', $data)->render();

        return $this->generatePdf($html, 'A4', 'portrait');
    }

    /**
     * تولید Invoice PDF — فقط برای PARCEL و DOC_NORMAL/DOC_ECONOMY
     * (نه برای محموله‌های DOC خالص که کالا ندارن)
     */
    public function invoice(Shipment $shipment): string
    {
        // اگه محموله DOC هست و آیتم نداره، invoice تولید نکن
        if ($shipment->type === ShipmentType::DocNormal || $shipment->type === ShipmentType::DocEconomy) {
            if ($shipment->items->isEmpty()) {
                throw new \InvalidArgumentException(
                    'فاکتور فقط برای محموله‌های دارای کالا (PARCEL) صادر می‌شود. محموله‌های DOC بدون کالا فاکتور ندارند.'
                );
            }
        }

        $shipment->loadMissing(['fromCountry', 'toCountry', 'items']);

        $data = [
            'shipment' => $shipment,
            'shipper' => $this->formatAddress($shipment, 'sender'),
            'receiver' => $this->formatAddress($shipment, 'receiver'),
            'items' => $shipment->items ?? collect(),
            'invoice_total_usd' => optional($shipment->items)->sum('total_usd') ?? 0,
            'barcode_base64' => $this->generateBarcode($shipment->awb_no),
        ];

        $html = view('pdfs.invoice', $data)->render();

        return $this->generatePdf($html, 'A4', 'portrait');
    }

    /**
     * تولید Label PDF — اندازه استاندارد لیبل پستی (100x150mm)
     */
    public function label(Shipment $shipment): string
    {
        $shipment->loadMissing(['fromCountry', 'toCountry']);

        $data = [
            'shipment' => $shipment,
            'barcode_base64' => $this->generateBarcode($shipment->awb_no),
            'origin_iso' => $shipment->fromCountry?->iso_code ?? 'IR',
            'dest_iso' => $shipment->toCountry?->iso_code ?? '',
        ];

        $html = view('pdfs.label', $data)->render();

        // A5 افقی (Landscape) — استاندارد لیبل پستی: 210×148 mm
        return $this->generatePdf($html, 'A5', 'landscape');
    }

    /**
     * تولید بارکد از AWB number — base64 embed (مطمئن‌ترین روش)
     */
    private function generateBarcode(string $awbNo): string
    {
        try {
            $generator = new BarcodeGeneratorPNG();
            $barcode = $generator->getBarcode($awbNo, $generator::TYPE_CODE_128, 2, 40);

            // تبدیل به base64 و استفاده از data URI
            return 'data:image/png;base64,' . base64_encode($barcode);
        } catch (\Throwable $e) {
            Log::error('Barcode generation failed', [
                'awb' => $awbNo,
                'error' => $e->getMessage(),
            ]);
            return '';
        }
    }

    /**
     * برچسب Service برای AWB (Outbound/Inbound)
     */
    private function getServiceLabel(Shipment $shipment): string
    {
        return match ($shipment->direction?->value) {
            'export' => 'Outbound',
            'import' => 'Inbound',
            default => 'Outbound',
        };
    }

    /**
     * برچسب Type برای AWB (NON DOC / DOC)
     */
    private function getTypeLabel(Shipment $shipment): string
    {
        return match ($shipment->type) {
            ShipmentType::Parcel => 'NON DOC',
            ShipmentType::DocNormal => 'DOC NORMAL',
            ShipmentType::DocEconomy => 'DOC ECONOMY',
            default => 'NON DOC',
        };
    }

    /**
     * تولید PDF از HTML
     */
    private function generatePdf(string $html, array|string $paper, string $orientation): string
    {
        $options = new Options();
        $options->set('isHtml5ParserEnabled', true);
        $options->set('isRemoteEnabled', true);  // مهم: برای data URI
        $options->set('defaultFont', 'DejaVu Sans');
        $options->set('dpi', 150);
        $options->set('debugKeepTemp', false);
        $options->set('debugCss', false);
        $options->set('debugLayout', false);

        $dompdf = new Dompdf($options);
        $dompdf->loadHtml($html);

        if (is_array($paper)) {
            $dompdf->setPaper($paper, $orientation);
        } else {
            $dompdf->setPaper($paper, $orientation);
        }

        $dompdf->render();

        return $dompdf->output();
    }

    /**
     * فرمت‌بندی آدرس فرستنده/گیرنده
     */
    private function formatAddress(Shipment $shipment, string $prefix): Collection
    {
        return collect([
            'name' => $shipment->{$prefix . '_name'},
            'company' => $shipment->{$prefix . '_company'},
            'phone' => $shipment->{$prefix . '_phone'},
            'email' => $shipment->{$prefix . '_email'},
            'address' => $shipment->{$prefix . '_address'},
            'city' => $shipment->{$prefix . '_city'},
            'zip' => $shipment->{$prefix . '_zip'},
            'id_number' => $shipment->{$prefix . '_id_number'},
        ]);
    }
}