<?php

namespace App\Http\Controllers;

use App\Models\Category;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class CategoryManagementController extends Controller
{
    /**
     * Display a listing of categories.
     */
    public function index(Request $request)
    {
        $query = Category::withCount('products');

        // Search
        if ($request->filled('search')) {
            $search = $request->search;
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                    ->orWhere('description', 'like', "%{$search}%");
            });
        }

        $categories = $query->latest()->paginate(20);

        return view('categories.index', compact('categories'));
    }

    /**
     * Show the form for creating a new category.
     */
    public function create()
    {
        return view('categories.create');
    }

    /**
     * Store a newly created category.
     */
    public function store(Request $request)
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255', 'unique:categories,name'],
            'description' => ['nullable', 'string', 'max:1000'],
        ]);

        // Generate unique slug
        $validated['slug'] = Category::generateUniqueSlug($validated['name']);

        Category::create($validated);

        return redirect()->route('categories.index')
            ->with('success', 'Category created successfully.');
    }

    /**
     * Show the form for editing a category.
     */
    public function edit(Category $category)
    {
        return view('categories.edit', compact('category'));
    }

    /**
     * Update the specified category.
     */
    public function update(Request $request, Category $category)
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255', Rule::unique('categories')->ignore($category->id)],
            'description' => ['nullable', 'string', 'max:1000'],
        ]);

        // Regenerate slug if name changed
        if ($category->name !== $validated['name']) {
            $validated['slug'] = Category::generateUniqueSlug($validated['name'], $category->id);
        }

        $category->update($validated);

        return redirect()->route('categories.index')
            ->with('success', 'Category updated successfully.');
    }

    /**
     * Remove the specified category.
     */
    public function destroy(Category $category)
    {
        // Check if category has products
        if ($category->products()->count() > 0) {
            return redirect()->route('categories.index')
                ->with('error', "Cannot delete category '{$category->name}' because it has {$category->products()->count()} products. Please reassign or delete those products first.");
        }

        $category->delete();

        return redirect()->route('categories.index')
            ->with('success', 'Category deleted successfully.');
    }
}