<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Concerns\EnsuresPublicDiskWritable;
use App\Http\Controllers\Concerns\StoresPublicUploadWithoutFileinfo;
use App\Http\Controllers\Controller;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;
use Illuminate\Validation\ValidationException;
use Throwable;

class UploadController extends Controller
{
    use EnsuresPublicDiskWritable;
    use StoresPublicUploadWithoutFileinfo;

    public function store(Request $request): JsonResponse
    {
        if ($early = $this->ensurePublicDiskReady()) {
            return $early;
        }

        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);
        }

        try {
            $stored = $this->storeUploadedFileAsUniqueName($uploaded, 'uploads', 1024);
        } catch (ValidationException $e) {
            throw $e;
        } catch (Throwable $e) {
            report($e);
            Log::error('upload_putfile_failed', [
                'message' => $e->getMessage(),
                'public_path' => storage_path('app/public'),
            ]);

            return response()->json([
                'message' => '文件保存失败',
                'detail' => config('app.debug') ? $e->getMessage() : null,
            ], 500);
        }

        return response()->json([
            'path' => $stored['path'],
            'url' => url('/storage/'.$stored['path']),
            'mime' => self::jsonSafeString($stored['mime']),
            'size' => $uploaded->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';
    }

    /**
     * 删除 public 磁盘下已上传文件（仅 uploads/ 根目录内扁平文件）。仅超级管理员。
     */
    public function remove(Request $request): JsonResponse
    {
        abort_unless($request->user()?->isSuperAdmin(), 403, '仅超级管理员可删除上传文件');

        $data = $request->validate([
            'path' => ['required', 'string', 'max:500'],
        ]);

        $path = str_replace('\\', '/', trim($data['path']));
        if (str_contains($path, '..') || ! str_starts_with($path, 'uploads/')) {
            return response()->json(['message' => '无效路径'], 422);
        }

        if (! preg_match('#^uploads/[a-zA-Z0-9][a-zA-Z0-9._-]*$#', $path)) {
            return response()->json(['message' => '无效路径'], 422);
        }

        if (! Storage::disk('public')->exists($path)) {
            return response()->json(['message' => '文件不存在'], 404);
        }

        Storage::disk('public')->delete($path);

        return response()->json(['message' => '已删除']);
    }
}