<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Models\Upload;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\URL;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\StreamedResponse;

final class UploadModerationController extends Controller
{
    public function pending(): JsonResponse
    {
        $uploads = Upload::query()
            ->with(['user:id,name,username', 'category:id,name,slug'])
            ->where('status', 'draft')
            ->where('moderation_status', 'pending')
            ->orderBy('created_at')
            ->get()
            ->map(fn (Upload $upload): array => $this->present($upload))
            ->values();

        return response()->json([
            'data' => $uploads,
        ], Response::HTTP_OK);
    }

    public function preview(string $id): StreamedResponse|JsonResponse
    {
        $upload = Upload::query()
            ->where('status', 'draft')
            ->where('moderation_status', 'pending')
            ->find($id);

        if (! $upload) {
            return response()->json(['message' => 'Upload not found.'], Response::HTTP_NOT_FOUND);
        }

        $path = $this->safePreviewPath($upload);
        if ($path === null || ! Storage::disk('local')->exists($path)) {
            return response()->json(['message' => 'Preview not found.'], Response::HTTP_NOT_FOUND);
        }

        return Storage::disk('local')->response($path, 'preview.webp', [
            'Content-Type' => 'image/webp',
            'Cache-Control' => 'private, max-age=120',
        ]);
    }

    public function approve(string $id, Request $request): JsonResponse
    {
        $upload = Upload::query()->find($id);

        if (! $upload) {
            return response()->json(['message' => 'Upload not found.'], Response::HTTP_NOT_FOUND);
        }

        $upload->moderation_status = 'approved';
        $upload->moderated_at = now();
        $upload->moderated_by = (int) $request->user()->id;
        $upload->moderation_note = $request->input('note');
        $upload->save();

        return response()->json([
            'success' => true,
            'id' => (string) $upload->id,
            'moderation_status' => (string) $upload->moderation_status,
        ], Response::HTTP_OK);
    }

    public function reject(string $id, Request $request): JsonResponse
    {
        $upload = Upload::query()->find($id);

        if (! $upload) {
            return response()->json(['message' => 'Upload not found.'], Response::HTTP_NOT_FOUND);
        }

        $upload->moderation_status = 'rejected';
        $upload->status = 'rejected';
        $upload->processing_state = 'rejected';
        $upload->moderated_at = now();
        $upload->moderated_by = (int) $request->user()->id;
        $upload->moderation_note = (string) $request->input('note', '');
        $upload->save();

        return response()->json([
            'success' => true,
            'id' => (string) $upload->id,
            'status' => (string) $upload->status,
            'processing_state' => (string) $upload->processing_state,
            'moderation_status' => (string) $upload->moderation_status,
        ], Response::HTTP_OK);
    }

    private function present(Upload $upload): array
    {
        $tags = collect($upload->tags ?? [])
            ->map(function (mixed $tag): string {
                if (is_array($tag)) {
                    return trim((string) ($tag['name'] ?? $tag['slug'] ?? ''));
                }

                return trim((string) $tag);
            })
            ->filter()
            ->values()
            ->all();

        $hasPreview = $this->safePreviewPath($upload) !== null;

        return [
            'id' => (string) $upload->id,
            'title' => (string) ($upload->title ?: '(untitled upload)'),
            'description' => (string) ($upload->description ?? ''),
            'type' => (string) ($upload->type ?? 'image'),
            'preview_url' => $hasPreview
                ? URL::temporarySignedRoute('api.admin.uploads.preview', now()->addMinutes(30), ['id' => $upload->id])
                : null,
            'preview_lg_url' => $hasPreview
                ? URL::temporarySignedRoute('api.admin.uploads.preview', now()->addMinutes(30), ['id' => $upload->id])
                : null,
            'tags' => $tags,
            'categories' => $upload->category?->name ? [(string) $upload->category->name] : [],
            'user' => $upload->user ? [
                'id' => (int) $upload->user->id,
                'name' => (string) $upload->user->name,
                'username' => $upload->user->username,
            ] : null,
            'nsfw' => (bool) $upload->nsfw,
            'license' => $upload->license,
            'created_at' => optional($upload->created_at)?->toISOString(),
        ];
    }

    private function safePreviewPath(Upload $upload): ?string
    {
        $path = str_replace('\\', '/', ltrim((string) $upload->preview_path, '/'));
        $expectedPrefix = 'tmp/drafts/'.$upload->id.'/';

        if ($path === '' || str_contains($path, '..') || ! str_starts_with($path, $expectedPrefix)) {
            return null;
        }

        return $path;
    }
}