<?php

namespace App\Http\Controllers\Business;

use App\Models\Common\Company;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Routing\Controller;
use Illuminate\Support\Facades\Storage;
use Illuminate\Validation\ValidationException;
use Illuminate\View\View;
use Modules\EcommerceFinance\Services\SupplierNegativeAlertDingTalkWorkflow;
use Symfony\Component\HttpFoundation\StreamedResponse;

class SupplierNegativeAlertDingTalkForms extends Controller
{
    public function __construct(
        private readonly SupplierNegativeAlertDingTalkWorkflow $workflow,
    ) {
    }

    public function show(string $token): View|Response
    {
        $assignment = $this->resolve($token);
        if ($assignment === null) {
            return $this->unavailable();
        }

        $snapshot = json_decode((string) $assignment->snapshot, true);
        $snapshot = is_array($snapshot) ? array_values($snapshot) : [];
        $latestPeriod = $this->workflow->latestPeriodSummary($snapshot);

        return view('business.pages.negative-alerts.dingtalk-task', [
            'assignment' => $assignment,
            'suppliers' => $snapshot,
            'latestPeriod' => $latestPeriod,
            'processingDeadline' => $this->workflow->processingDeadline((string) $latestPeriod['month']),
            'supplierResults' => $this->workflow->resultsForAssignment((int) $assignment->id),
            'supplierAttachments' => $this->workflow->attachmentsForAssignment((int) $assignment->id),
            'token' => $token,
        ]);
    }

    public function update(Request $request, string $token): RedirectResponse|Response
    {
        $assignment = $this->resolve($token);
        if ($assignment === null) {
            return $this->unavailable();
        }
        $snapshot = json_decode((string) $assignment->snapshot, true);
        $supplierCount = is_array($snapshot) ? count($snapshot) : 0;

        $data = $request->validate([
            'results' => ['required', 'array', 'size:' . $supplierCount],
            'results.*' => ['nullable', 'string', 'max:2000'],
            'screenshots' => ['nullable', 'array', 'size:' . $supplierCount],
            'screenshots.*' => ['nullable', 'array', 'max:5'],
            'screenshots.*.*' => ['file', 'mimes:jpg,jpeg,png,webp', 'max:10240'],
        ], [
            'results.required' => '请为每个供应商填写处理结果。',
            'results.size' => '请为每个供应商填写处理结果。',
            'results.*.max' => '单个供应商的处理结果不能超过 2000 个字符。',
            'screenshots.*.*.mimes' => '处理截图仅支持 JPG、PNG、WEBP 图片。',
            'screenshots.*.*.max' => '单张处理截图不能超过 10MB。',
        ]);
        if (! collect((array) $data['results'])->contains(
            static fn (mixed $value): bool => trim((string) $value) !== '',
        )) {
            throw ValidationException::withMessages([
                'results' => '请至少填写一个供应商的处理结果。',
            ]);
        }
        $uploads = [];
        foreach ((array) $request->file('screenshots', []) as $index => $files) {
            $uploads[(int) $index] = array_values(array_filter(
                (array) $files,
                static fn (mixed $file): bool => $file !== null,
            ));
        }
        $existingAttachments = $this->workflow->attachmentsForAssignment((int) $assignment->id);
        foreach (is_array($snapshot) ? $snapshot : [] as $index => $supplier) {
            $supplierName = trim((string) ($supplier['supplier'] ?? ''));
            $existingCount = count($existingAttachments[$supplierName] ?? []);
            if ($existingCount + count($uploads[$index] ?? []) > 5) {
                throw ValidationException::withMessages([
                    'screenshots' => $supplierName . ' 最多上传 5 张处理截图。',
                ]);
            }
        }

        try {
            $this->workflow->submit($token, array_values((array) $data['results']));
            $this->workflow->storeAttachments($assignment, is_array($snapshot) ? $snapshot : [], $uploads);
        } catch (ValidationException $exception) {
            throw $exception;
        }

        return redirect()
            ->route('supplier-negative-alert.task', ['token' => $token])
            ->with('negative_alert_success', '已保存本次填写的供应商处理结果，未填写的供应商会继续留在待处理任务中。');
    }

    public function attachment(string $token, int $attachment): StreamedResponse|Response
    {
        $assignment = $this->resolve($token);
        if ($assignment === null) {
            return $this->unavailable();
        }
        $file = $this->workflow->attachmentForAssignment((int) $assignment->id, $attachment);
        abort_if($file === null, 404);

        $disk = Storage::disk('uploads');
        abort_unless($disk->exists((string) $file->path), 404, '处理截图不存在。');

        return $disk->response((string) $file->path, (string) $file->original_name, [
            'Cache-Control' => 'private, no-store',
            'Content-Type' => (string) $file->mime_type,
            'X-Content-Type-Options' => 'nosniff',
        ]);
    }

    private function resolve(string $token): ?object
    {
        $assignment = $this->workflow->findByToken($token);
        if ($assignment === null) {
            return null;
        }

        Company::find($assignment->company_id)?->makeCurrent();

        return $assignment;
    }

    private function unavailable(): Response
    {
        return response()->view('business.pages.negative-alerts.dingtalk-task-unavailable', [], 404);
    }
}