<?php

namespace App\Services;

use App\Models\Invoice;
use App\Models\Setting;
use App\Support\InvoiceBuyer;
use Barryvdh\DomPDF\Facade\Pdf;
use Illuminate\Support\Facades\Log;

class InvoicePdfService
{
    public function generate(Invoice $invoice): string
    {
        $invoice->load(['invoiceItems.product', 'customer', 'order.orderItems']);

        $setting      = Setting::where('key', 'setting')->first();
        $settingValue = $setting ? json_decode((string) $setting->value) : null;

        $data = [
            'invoice'        => $invoice,
            'invoiceItems'   => $invoice->invoiceItems,
            'customer'       => $invoice->customer,
            'buyer'          => InvoiceBuyer::forInvoice($invoice),
            'order'          => $invoice->order,
            'companyName'    => $settingValue->company    ?? 'Thế Giới Số',
            'companyAddress' => $settingValue->address    ?? '',
            'companyPhone'   => $settingValue->hotline    ?? ($settingValue->tel ?? ''),
            'companyEmail'   => $settingValue->email      ?? '',
            'companyLogo'    => $this->resolvePdfImagePath($settingValue->logo ?? ''),
            'companyTaxCode' => $settingValue->tax        ?? '',
            'brandColor'     => $settingValue->brand_color ?? '#1a56db',
            'cfg'            => [
                'accent_color'       => $settingValue->brand_color ?? '#1a56db',
                'show_logo'          => true,
                'show_company_info'  => true,
                'show_customer_info' => true,
                'show_order_info'    => true,
                'show_items_table'   => true,
                'show_summary'       => true,
                'show_note'          => true,
                'footer_text'        => 'Cảm ơn quý khách đã sử dụng dịch vụ.',
                'footer_note'        => 'Đây là hóa đơn điện tử được tạo tự động, không cần chữ ký số.',
            ],
        ];

        return Pdf::loadView('pdf.invoice', $data)
            ->setPaper('a4', 'portrait')
            ->output();
    }

    public function vatFileName(Invoice $invoice): string
    {
        return 'Hoa-don-VAT-' . $invoice->vat_serial . '-' . $invoice->vat_number . '.pdf';
    }

    /** @return array{pdf: string, file_name: string}|null */
    public function attachment(?int $invoiceId): ?array
    {
        if (!$invoiceId) {
            return null;
        }

        try {
            $invoice = Invoice::find($invoiceId);

            return $invoice ? ['pdf' => $this->generate($invoice), 'file_name' => $this->generateFileName($invoice)] : null;
        } catch (\Throwable $e) {
            Log::warning('InvoicePdfService: PDF generation failed, sending without attachment', [
                'invoice_id' => $invoiceId,
                'error' => $e->getMessage(),
            ]);

            return null;
        }
    }

    public function generateFileName(Invoice $invoice): string
    {
        return 'Hoa-don-' . $invoice->invoice_number . '.pdf';
    }

    private function resolvePdfImagePath(?string $path): string
    {
        if (!$path) {
            return '';
        }

        $urlPath = parse_url($path, PHP_URL_PATH) ?: $path;

        if (str_starts_with($urlPath, '/storage/')) {
            $localPath = storage_path('app/public/' . ltrim(substr($urlPath, strlen('/storage/')), '/'));

            return file_exists($localPath) ? $localPath : $path;
        }

        if (str_starts_with($path, 'storage/')) {
            $localPath = storage_path('app/public/' . substr($path, strlen('storage/')));

            return file_exists($localPath) ? $localPath : $path;
        }

        return $path;
    }
}