<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Api\Concerns\ResolvesParticipantApplication;
use App\Http\Controllers\Controller;
use App\Models\Application;
use App\Models\ApplicationFile;
use App\Support\SignupFormFileRules;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;
use Symfony\Component\HttpFoundation\StreamedResponse;

class ApplicationFileController extends Controller
{
    use ResolvesParticipantApplication;

    private function application(Request $request): Application
    {
        $app = $this->participantApplication($request);
        $app->assertMayEditSignup('file');

        return $app;
    }

    public function store(Request $request): JsonResponse
    {
        $maxKb = (int) config('contest.file_max_kb', 20480);

        $data = $request->validate([
            'kind' => ['required', 'string', Rule::in(['plan', 'supporting'])],
            'file' => ['required', 'file', 'max:'.$maxKb],
        ]);

        $app = $this->application($request);
        $app->loadMissing('competition');

        $uploaded = $data['file'];
        $ext = strtolower($uploaded->getClientOriginalExtension());

        $schemaRow = SignupFormFileRules::fileFieldRow($app->competition, $data['kind']);
        $allowedExt = SignupFormFileRules::effectiveAllowedExtensions($schemaRow);
        if (! in_array($ext, $allowedExt, true)) {
            throw ValidationException::withMessages([
                'file' => ['仅支持：'.implode('、', $allowedExt)],
            ]);
        }

        $maxFiles = SignupFormFileRules::maxCount($schemaRow);
        if ($maxFiles !== null) {
            $current = $app->files()->where('kind', $data['kind'])->count();
            if ($current >= $maxFiles) {
                throw ValidationException::withMessages([
                    'file' => ['最多可上传 '.$maxFiles.' 个文件'],
                ]);
            }
        }
        $path = $uploaded->store("applications/{$app->id}", 'public');

        $file = ApplicationFile::create([
            'application_id' => $app->id,
            'kind' => $data['kind'],
            'disk' => 'public',
            'path' => $path,
            'original_name' => $uploaded->getClientOriginalName(),
            'size' => $uploaded->getSize(),
            'mime' => $uploaded->getClientMimeType(),
        ]);

        return response()->json([
            'id' => $file->id,
            'kind' => $file->kind,
            'original_name' => $file->original_name,
            'size' => $file->size,
            'url' => $file->participantPreviewSignedUrl(),
        ], 201);
    }

    /**
     * 选手附件预览（签名 URL，GET 无需 Bearer；由 API 在 json 中下发短期有效链接）。
     */
    public function downloadSigned(Request $request, ApplicationFile $file): StreamedResponse
    {
        if (! Storage::disk($file->disk)->exists($file->path)) {
            abort(404);
        }

        return Storage::disk($file->disk)->response(
            $file->path,
            $file->clientDownloadName(),
            [
                'Cache-Control' => 'private, no-store',
            ],
            $file->preferredStreamDisposition(),
        );
    }

    public function destroy(Request $request, ApplicationFile $file): JsonResponse
    {
        if ($file->application->user_id !== $request->user()->id) {
            abort(404);
        }

        $file->application->assertMayEditSignup('file');

        Storage::disk($file->disk)->delete($file->path);
        $file->delete();

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