<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Throwable;

class UploadController extends Controller
{
    public function store(Request $request): JsonResponse
    {
        if (!$request->hasFile('file')) {
            return response()->json([
                'message' => '未收到文件，请使用 multipart 表单字段名 file。',
            ], 422);
        }

        $uploaded = $request->file('file');
        if (!$uploaded->isValid()) {
            return response()->json([
                'message' => '上传未通过校验：'.$uploaded->getErrorMessage(),
            ], 422);
        }

        $data = $request->validate([
            'file' => ['required', 'file', 'max:20480'],
        ]);

        try {
            $path = Storage::disk('public')->putFile('uploads', $data['file']);
        } catch (Throwable $e) {
            report($e);

            return response()->json([
                'message' => '文件保存失败',
            ], 500);
        }

        if ($path === false) {
            return response()->json([
                'message' => '文件保存失败',
            ], 500);
        }

        try {
            $mime = $data['file']->getMimeType()
                ?: $data['file']->getClientMimeType()
                ?: 'application/octet-stream';
        } catch (Throwable) {
            $mime = 'application/octet-stream';
        }

        return response()->json([
            'path' => $path,
            'url' => url('/storage/'.str_replace('\\', '/', $path)),
            'mime' => self::jsonSafeString($mime),
            'size' => $data['file']->getSize(),
        ]);
    }

    /** 避免 mime 等字段含非法 UTF-8 导致 json_encode 抛错成 500 */
    private static function jsonSafeString(string $value): string
    {
        if ($value === '') {
            return '';
        }

        if (function_exists('mb_scrub')) {
            return mb_scrub($value, 'UTF-8');
        }

        $clean = @iconv('UTF-8', 'UTF-8//IGNORE', $value);

        return $clean !== false ? $clean : 'application/octet-stream';
    }
}