<?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 PDF فاکتور فروش خدمات (واردات) — مطابق Sheet ENG Invoice
     */
    public function importInvoice(Shipment $shipment, array $options = []): string
    {
        $shipment->loadMissing(['fromCountry', 'toCountry', 'items']);

        // آدرس گیرنده
        $receiver = [
            'name' => $shipment->receiver_name,
            'company' => $shipment->receiver_company,
            'phone' => $shipment->receiver_phone,
            'email' => $shipment->receiver_email,
            'address' => $shipment->receiver_address,
            'city' => $shipment->receiver_city,
            'country' => $shipment->toCountry?->name ?? '',
        ];

        // شماره فاکتور (از شماره AWB مشتق می‌شود)
        $invoice_no = $options['invoice_no'] ?? 'PEX' . date('ymd') . substr($shipment->awb_no, -4);
        
        // تاریخ فاکتور
        $invoice_date = $options['invoice_date'] ?? now()->format('l, F j, Y');
        
        // دفتر گمرکی
        $customs_office = $options['customs_office'] ?? 'Imam Khomeini Airport';
        
        // نرخ ارز
        $exchange_rate = $options['exchange_rate'] ?? 500000; // پیش‌فرض

        // اقلام خدماتی (۱۰ ردیف ثابت مطابق Sheet ENG Invoice)
        $service_items = $this->buildServiceItems($shipment, $options);

        // جمع‌بندی
        $freight_items = array_slice($service_items, 0, 5); // آیتم‌های حمل
        $clearance_items = array_slice($service_items, 5); // آیتم‌های ترخیص

        $freight_subtotal_currency = array_sum(array_column($freight_items, 'total_currency'));
        $freight_subtotal_rial = array_sum(array_column($freight_items, 'total_rial'));
        $clearance_subtotal_currency = array_sum(array_column($clearance_items, 'total_currency'));
        $clearance_subtotal_rial = array_sum(array_column($clearance_items, 'total_rial'));
        $total_currency = $freight_subtotal_currency + $clearance_subtotal_currency;
        $total_rial = $freight_subtotal_rial + $clearance_subtotal_rial;

        // شرایط و ضوابط
        $terms_and_conditions = $options['terms_and_conditions'] ?? 
            'This proforma invoice is issued based on the shipment weight declared by the customer. Final weight and dimensions will be determined after re-weighing at the destination customs.';

        $data = [
            'shipment' => $shipment,
            'receiver' => $receiver,
            'invoice_no' => $invoice_no,
            'invoice_date' => $invoice_date,
            'customs_office' => $customs_office,
            'exchange_rate' => $exchange_rate,
            'service_items' => $service_items,
            'freight_subtotal_currency' => $freight_subtotal_currency,
            'freight_subtotal_rial' => $freight_subtotal_rial,
            'clearance_subtotal_currency' => $clearance_subtotal_currency,
            'clearance_subtotal_rial' => $clearance_subtotal_rial,
            'total_currency' => $total_currency,
            'total_rial' => $total_rial,
            'terms_and_conditions' => $terms_and_conditions,
        ];

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

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

    /**
     * ساخت اقلام خدماتی فاکتور واردات
     */
    private function buildServiceItems(Shipment $shipment, array $options): array
    {
        // فیلدهای پیش‌فرض از گزینه‌ها یا مقادیر پیش‌فرض
        $fields = [
            'international_freight' => $options['international_freight'] ?? ($shipment->shipping_price ?? 0),
            'pick_up_fee' => $options['pick_up_fee'] ?? ($shipment->domestic_pickup ?? 0),
            'brand_fee' => $options['brand_fee'] ?? 0,
            'report_fee' => $options['report_fee'] ?? 0,
            'other_charges' => $options['other_charges'] ?? ($shipment->extra_service ?? 0),
            'customs_clearance' => $options['customs_clearance'] ?? 0,
            'domestic_transport' => $options['domestic_transport'] ?? ($shipment->domestic_delivery ?? 0),
            'warehousing_fee' => $options['warehousing_fee'] ?? ($shipment->warehousing_cost ?? 0),
            'order_registration_fee' => $options['order_registration_fee'] ?? 0,
            'other_clearance_charges' => $options['other_clearance_charges'] ?? 0,
        ];

        $exchange_rate = $options['exchange_rate'] ?? 500000;
        $weight = $shipment->chargeable_weight ?? $shipment->weight;

        return [
            // آیتم‌های حمل (Freight)
            [
                'description' => 'International Freight',
                'unit' => 'kg',
                'quantity' => $weight,
                'unit_price' => $fields['international_freight'] > 0 ? $fields['international_freight'] / $weight : 0,
                'total_currency' => $fields['international_freight'],
                'total_rial' => $fields['international_freight'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Pick Up Fee',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['pick_up_fee'],
                'total_rial' => $fields['pick_up_fee'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Brand Fee',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['brand_fee'],
                'total_rial' => $fields['brand_fee'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Report Fee',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['report_fee'],
                'total_rial' => $fields['report_fee'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Other Charges',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['other_charges'],
                'total_rial' => $fields['other_charges'] * $exchange_rate,
                'notes' => '',
            ],
            // آیتم‌های ترخیص (Clearance)
            [
                'description' => 'Customs Clearance',
                'unit' => 'service',
                'quantity' => $weight,
                'unit_price' => $fields['customs_clearance'] > 0 ? $fields['customs_clearance'] / $weight : 0,
                'total_currency' => $fields['customs_clearance'],
                'total_rial' => $fields['customs_clearance'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Domestic Transport',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['domestic_transport'],
                'total_rial' => $fields['domestic_transport'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Warehousing Fee',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['warehousing_fee'],
                'total_rial' => $fields['warehousing_fee'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Order Registration Fee',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['order_registration_fee'],
                'total_rial' => $fields['order_registration_fee'] * $exchange_rate,
                'notes' => '',
            ],
            [
                'description' => 'Other Clearance Charges',
                'unit' => '',
                'quantity' => 0,
                'unit_price' => 0,
                'total_currency' => $fields['other_clearance_charges'],
                'total_rial' => $fields['other_clearance_charges'] * $exchange_rate,
                'notes' => '',
            ],
        ];
    }

    /**
     * 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'},
        ]);
    }
}