<?php

namespace App\Support;

use Illuminate\Support\Facades\Storage;
use Illuminate\Validation\ValidationException;
use PhpOffice\PhpSpreadsheet\Worksheet\Drawing;
use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;

final class CourierStockQuoteImageArchive
{
    /** 原样复制工作表内嵌图片，不使用屏幕截图、裁剪结果或重新编码的图片冒充原件。 */
    public function store(Worksheet $sheet, string $workbookPath, string $directory, array &$savedPaths): array
    {
        $files = $warnings = [];
        $prefix = 'zip://' . realpath($workbookPath) . '#';
        foreach ($sheet->getDrawingCollection() as $index => $drawing) {
            if (! $drawing instanceof Drawing || ! str_starts_with($drawing->getPath(), $prefix)) {
                $warnings[] = '图片 ' . ($index + 1) . ' 无法无损提取，请另附原图；整本 Excel 已保留。';
                continue;
            }
            $stream = @fopen($drawing->getPath(), 'rb');
            if ($stream === false) {
                $this->failed($sheet);
            }
            try {
                $bytes = stream_get_contents($stream, 20 * 1024 * 1024 + 1);
            } finally {
                fclose($stream);
            }
            if ($bytes === false || $bytes === '' || strlen($bytes) > 20 * 1024 * 1024) {
                $this->failed($sheet);
            }
            $mime = (new \finfo(FILEINFO_MIME_TYPE))->buffer($bytes);
            $extension = strtolower(pathinfo($drawing->getPath(), PATHINFO_EXTENSION));
            // 不支持浏览器预览的原始格式仍按原字节留存，只提供下载。
            $extension = preg_match('/^[a-z0-9]{1,8}$/', $extension) ? $extension : 'bin';
            $name = $sheet->getTitle() . '-原件图片-' . ($index + 1) . '.' . $extension;
            $path = $directory . '/' . ($index + 1) . '.' . $extension;
            $savedPaths[] = $path;
            if (! Storage::disk('uploads')->put($path, $bytes, 'private')) {
                $this->failed($sheet);
            }
            $files[] = [
                'kind' => 'signed', 'path' => $path, 'name' => $name, 'sha256' => hash('sha256', $bytes),
                'mime_type' => $mime, 'size' => strlen($bytes), 'sheet_name' => $sheet->getTitle(),
                'anchor' => $drawing->getCoordinates(), 'image_index' => $index + 1,
                'source' => 'workbook_embedded', 'archived_at' => now()->toIso8601String(),
            ];
        }

        return ['signed_images' => $files, 'image_warnings' => array_values(array_unique($warnings))];
    }

    private function failed(Worksheet $sheet): never
    {
        throw ValidationException::withMessages(['source_quote' => '工作表「' . $sheet->getTitle() . '」原件图片提取或存档失败（每张最多 20 MB），本次上传未完成，请重试。']);
    }
}