<?php

namespace App\Http\Controllers\Business;

use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller;
use Modules\EcommerceFinance\Services\PayablesFinalImporter;
use Modules\EcommerceFinance\Services\PayablesFinalImportRunner;
use Modules\EcommerceFinance\Services\PayablesFinalRegistry;
use Modules\EcommerceFinance\Services\PayablesFieldNormalizer;
use Modules\EcommerceFinance\Services\SupplierPayableImportTemplate;
use Modules\EcommerceFinance\Services\SupplierPayableOverrideStore;
use RuntimeException;
use Symfony\Component\HttpFoundation\StreamedResponse;

/**
 * 「终版」目录的按表数据：界面与基础页面一致，数据独立存放
 * （数据集键 final:<目录>:<页面>），初始为空，由页面上的导入、导出、查询、编辑维护。
 */
class PayablesFinalActions extends Controller
{
    public const DATASET_PREFIX = 'final:';

    public function __construct(
        private readonly PayablesFinalRegistry $registry,
        private readonly SupplierPayableImportTemplate $template,
        private readonly SupplierPayableOverrideStore $overrides,
        private readonly PayablesFinalImporter $importer,
        private readonly PayablesFieldNormalizer $normalizer,
    ) {
        $this->middleware('auth');
        $this->middleware('company.identify');
    }

    public function definition(Request $request): JsonResponse
    {
        return response()->json([
            'dataset' => $this->dataset($request),
            'fields' => collect($this->fields($request))
                ->map(static fn (array $definition, string $name): array => ['name' => $name] + $definition)
                ->values()
                ->all(),
        ]);
    }

    public function template(Request $request): StreamedResponse
    {
        return $this->template->download(
            $this->registry->title($this->section($request), $this->dataset($request)),
            $this->fields($request),
            true,
        );
    }

    public function import(Request $request): JsonResponse|RedirectResponse
    {
        $request->validate(['import' => ['required', 'file', 'mimes:xlsx,xls,csv', 'max:10240']]);
        $result = $this->importer->import(
            $this->fields($request),
            $this->storeDataset($request),
            $request->file('import'),
            (int) (company_id() ?: 1),
            user_id() ? (int) user_id() : null,
        );
        $message = "导入完成：新增 {$result['created']} 条，更新 {$result['updated']} 条。";

        return $request->expectsJson()
            ? response()->json(['message' => $message] + $result)
            : back()->with('success', $message);
    }

    /** 大文件导入第 1 步：上传文件并建立行缓存（前端随后按片拉取处理）。 */
    public function importUpload(Request $request, PayablesFinalImportRunner $runner): JsonResponse
    {
        $request->validate(['import' => ['required', 'file', 'mimes:xlsx,xls,csv', 'max:51200']]);

        $prepared = $runner->prepare(
            $request->file('import'),
            $this->fields($request),
            $this->storeDataset($request),
            (int) (company_id() ?: 1),
            user_id() ? (int) user_id() : null,
        );

        return response()->json($prepared + ['offset' => 0, 'created' => 0, 'updated' => 0, 'done' => false]);
    }

    /** 大文件导入第 2 步起：每次处理一片，前端拿到进度后继续。 */
    public function importChunk(Request $request, PayablesFinalImportRunner $runner): JsonResponse
    {
        $data = $request->validate([
            'token' => ['required', 'string', 'regex:/^[a-f0-9]{32}$/'],
            'offset' => ['required', 'integer', 'min:0'],
        ]);

        return response()->json($runner->process(
            $data['token'],
            (int) $data['offset'],
            null,
            (int) (company_id() ?: 1),
        ));
    }

    public function update(Request $request, string $recordKey): JsonResponse|RedirectResponse
    {
        $values = $this->normalizer->normalize($this->fields($request), (array) $request->input('values', []));
        $result = $this->overrides->save(
            $this->storeDataset($request),
            $recordKey,
            $values,
            (int) (company_id() ?: 1),
            user_id() ? (int) user_id() : null,
        );

        return $request->expectsJson()
            ? response()->json(['message' => '保存成功。'] + $result)
            : back()->with('success', '保存成功。');
    }

    public function export(Request $request): StreamedResponse
    {
        $fields = $this->fields($request);
        $title = $this->registry->title($this->section($request), $this->dataset($request));
        $rows = $this->overrides->listRows($this->storeDataset($request), (int) (company_id() ?: 1));

        return response()->streamDownload(function () use ($rows, $fields): void {
            $csv = fopen('php://output', 'w');
            if ($csv === false) {
                throw new RuntimeException('无法创建导出文件。');
            }
            fputs($csv, chr(0xEF) . chr(0xBB) . chr(0xBF));
            fputcsv($csv, array_merge(['记录标识'], array_column($fields, 'label')));

            foreach ($rows as $row) {
                $values = [$this->csvText($row['_action_key'] ?? '')];
                foreach ($fields as $field => $definition) {
                    $value = $row[$field] ?? '';
                    $values[] = $definition['type'] === 'number' && is_numeric($value)
                        ? $value
                        : $this->csvText($value);
                }
                fputcsv($csv, $values);
            }
            fclose($csv);
        }, $title . '_' . now()->format('Ymd_His') . '.csv', [
            'Content-Type' => 'text/csv; charset=UTF-8',
            'Cache-Control' => 'private, no-store',
        ]);
    }

    private function section(Request $request): string
    {
        return (string) $request->route('finalSection');
    }

    private function dataset(Request $request): string
    {
        $dataset = (string) $request->route('dataset');
        $this->registry->title($this->section($request), $dataset);

        return $dataset;
    }

    /** @return array<string,array{label:string,type:string}> */
    private function fields(Request $request): array
    {
        return $this->registry->fields($this->section($request), $this->dataset($request));
    }

    private function storeDataset(Request $request): string
    {
        $section = $this->section($request) === PayablesFinalRegistry::SECTION_COURIER ? 'courier' : 'supplier';

        return self::DATASET_PREFIX . $section . ':' . $this->dataset($request);
    }

    private function csvText(mixed $value): string
    {
        $value = (string) $value;

        return preg_match('/^[=+\-@\t\r]/u', $value) === 1 ? "\t" . $value : $value;
    }
}