<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Services\VenueImportService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;
use Symfony\Component\HttpFoundation\StreamedResponse;

class VenueImportController extends Controller
{
    public function __construct(
        private VenueImportService $venueImportService
    ) {}

    public function template(Request $request): StreamedResponse
    {
        $user = $request->user();
        abort_unless($user?->isSuperAdmin(), 403, '仅超级管理员可下载导入模板');

        $spreadsheet = $this->venueImportService->buildTemplateSpreadsheet();
        $writer = new Xlsx($spreadsheet);

        return response()->streamDownload(function () use ($writer) {
            $writer->save('php://output');
        }, '场馆导入模板.xlsx', [
            'Content-Type' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
        ]);
    }

    public function preview(Request $request): JsonResponse
    {
        abort_unless($request->user()?->isSuperAdmin(), 403, '仅超级管理员可导入场馆');

        $request->validate([
            'file' => ['required', 'file', 'mimes:xlsx,xls', 'max:10240'],
        ]);

        $path = $request->file('file')->getRealPath();
        if ($path === false) {
            return response()->json(['message' => '无法读取上传文件'], 422);
        }

        $result = $this->venueImportService->previewFromPath($path);

        return response()->json($result);
    }

    public function confirm(Request $request): JsonResponse
    {
        $user = $request->user();
        abort_unless($user?->isSuperAdmin(), 403, '仅超级管理员可导入场馆');

        $data = $request->validate([
            'rows' => ['required', 'array', 'min:1'],
            'rows.*' => ['required', 'array'],
        ]);

        $created = [];
        $errors = [];

        DB::beginTransaction();
        try {
            foreach ($data['rows'] as $index => $row) {
                $errs = $this->venueImportService->validatePayload($row);
                if ($errs !== []) {
                    $errors[] = ['index' => $index, 'errors' => $errs];

                    continue;
                }
                $clean = $this->venueImportService->stripInternalKeys($row);
                $created[] = $this->venueImportService->createVenueFromPayload($clean, $user)->toArray();
            }
            if ($errors !== []) {
                DB::rollBack();

                return response()->json([
                    'message' => '部分数据校验失败，未写入任何场馆',
                    'failures' => $errors,
                ], 422);
            }
            DB::commit();
        } catch (\Throwable $e) {
            DB::rollBack();
            throw $e;
        }

        return response()->json([
            'created' => $created,
            'count' => count($created),
        ], 201);
    }
}