<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\Identity\MailboxUserResolver;
use App\Services\Transfer\TransferService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use RuntimeException;

class TransferController extends Controller
{
    public function __construct(
        private TransferService $transfers,
        private MailboxUserResolver $users,
    ) {}

    /** Service-to-service upload (e.g. Ladill Mail for attachments above 25 MB). */
    public function store(Request $request): JsonResponse
    {
        if ($request->attributes->get('service_caller') !== 'webmail') {
            return response()->json(['message' => 'Forbidden.'], 403);
        }

        $maxBytes = (int) config('transfer.max_file_bytes', 0);
        $maxFiles = (int) config('transfer.max_files_per_transfer', 20);
        $fileRules = ['required', 'file'];
        if ($maxBytes > 0) {
            $fileRules[] = 'max:'.(int) ceil($maxBytes / 1024);
        }

        $data = $request->validate([
            'mailbox' => ['required', 'email', 'max:255'],
            'title' => ['nullable', 'string', 'max:120'],
            'message' => ['nullable', 'string', 'max:2000'],
            'retention_days' => ['nullable', 'integer', 'min:1', 'max:365'],
            'files' => ['required', 'array', 'min:1', 'max:'.$maxFiles],
            'files.*' => $fileRules,
        ]);

        try {
            $user = $this->users->resolve((string) $data['mailbox']);
        } catch (RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 422);
        }

        $title = trim((string) ($data['title'] ?? ''));
        if ($title === '') {
            $title = 'Email attachment';
        }

        $retentionDays = (int) ($data['retention_days'] ?? config('transfer.mail_retention_days', config('transfer.default_retention_days', 30)));

        try {
            $transfer = $this->transfers->create($user, [
                'title' => $title,
                'message' => $data['message'] ?? null,
                'retention_days' => $retentionDays,
            ], $request->file('files', []));
        } catch (RuntimeException $e) {
            return response()->json(['message' => $e->getMessage()], 422);
        }

        $transfer->load(['files', 'qrCode']);

        return response()->json([
            'data' => [
                'id' => $transfer->id,
                'title' => $transfer->title,
                'public_url' => $transfer->qrCode?->publicUrl(),
                'paid_until' => $transfer->paid_until?->toIso8601String(),
                'expires_at' => $transfer->paid_until?->toIso8601String(),
                'files' => $transfer->files->map(fn ($file) => [
                    'name' => $file->original_name,
                    'size_bytes' => $file->size_bytes,
                ])->values(),
            ],
        ], 201);
    }
}