<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Category;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\Validation\Rule;

class CategoryController extends Controller
{
    public function index()
    {
        return view('admin.categories.index', [
            'categories' => Category::query()->latest('id')->paginate(20),
        ]);
    }

    public function create()
    {
        return view('admin.categories.create');
    }

    public function store(Request $request)
    {
        $data = $this->validateCategory($request);
        $data['slug'] = $this->makeUniqueSlug($data['slug'] ?: $data['name']);
        Category::create($data);

        return redirect()->route('admin.categories.index')->with('status', 'Категория создана.');
    }

    public function edit(Category $category)
    {
        return view('admin.categories.edit', [
            'category' => $category,
        ]);
    }

    public function update(Request $request, Category $category)
    {
        $data = $this->validateCategory($request, $category);
        $data['slug'] = $this->makeUniqueSlug($data['slug'] ?: $data['name'], $category->id);
        $category->update($data);

        return redirect()->route('admin.categories.index')->with('status', 'Категория обновлена.');
    }

    public function destroy(Category $category)
    {
        $category->delete();

        return redirect()->route('admin.categories.index')->with('status', 'Категория удалена.');
    }

    private function validateCategory(Request $request, ?Category $category = null): array
    {
        return $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'slug' => [
                'nullable',
                'string',
                'max:255',
                Rule::unique('categories', 'slug')->ignore($category?->id),
            ],
            'description' => ['nullable', 'string'],
            'is_active' => ['nullable', 'boolean'],
        ]) + ['is_active' => $request->boolean('is_active')];
    }

    private function makeUniqueSlug(string $value, ?int $ignoreId = null): string
    {
        $base = Str::slug($value);
        if ($base === '') {
            $base = 'category';
        }

        $slug = $base;
        $index = 2;

        while (
            Category::query()
                ->where('slug', $slug)
                ->when($ignoreId, fn ($query) => $query->whereKeyNot($ignoreId))
                ->exists()
        ) {
            $slug = "{$base}-{$index}";
            $index++;
        }

        return $slug;
    }
}