<?php

namespace App\Support;

use App\Models\Business\CourierQuoteVersion;
use RuntimeException;

final class CourierQuotePdf
{
    public function render(CourierQuoteVersion $version): string
    {
        $version->loadMissing(['change.items']);
        $values = $this->decodeMatrix($version->values_json);
        $formulas = $this->decodeMatrix($version->formulas_json);
        $html = view('business.pdf.courier-quote', [
            'version' => $version,
            'change' => $version->change,
            'values' => $values,
            'formulas' => $formulas,
            'generatedAt' => now(),
            'fontPath' => str_replace('\\', '/', resource_path('fonts/DroidSansFallback.ttf')),
        ])->render();

        $pdf = app('dompdf.wrapper');
        $pdf->setPaper('a4', 'landscape');
        $pdf->loadHTML($html, 'UTF-8');
        $bytes = $pdf->output();

        if (! is_string($bytes) || ! str_starts_with($bytes, '%PDF-')) {
            throw new RuntimeException('报价 PDF 生成失败。');
        }

        return $bytes;
    }

    private function decodeMatrix(?string $json): array
    {
        if (blank($json)) {
            return [];
        }

        $decoded = json_decode($json, true);

        return is_array($decoded) ? $decoded : [];
    }
}