ShopSolution-backend/Webshop.Application/Services/Public/CategoryService.cs

// src/Webshop.Application/Services/Public/CategoryService.cs
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Webshop.Application.DTOs.Categorys;
using Webshop.Domain.Interfaces;

namespace Webshop.Application.Services.Public
{
    public class CategoryService : ICategoryService
    {
        private readonly ICategoryRepository _categoryRepository;

        public CategoryService(ICategoryRepository categoryRepository)
        {
            _categoryRepository = categoryRepository;
        }

        public async Task<IEnumerable<CategoryDto>> GetAllActiveAsync()
        {
            var categories = await _categoryRepository.GetAllAsync();

            // Hier könnte man eine Baumstruktur aufbauen, für den Anfang eine flache Liste
            return categories
                .Where(c => c.IsActive)
                .Select(c => new CategoryDto
                {
                    Id = c.Id,
                    Name = c.Name,
                    Slug = c.Slug,
                    Description = c.Description,
                    ParentCategoryId = c.ParentCategoryId,
                    ImageUrl = c.ImageUrl,
                    IsActive = c.IsActive,
                    DisplayOrder = c.DisplayOrder
                }).ToList();
        }

        public async Task<CategoryDto?> GetBySlugAsync(string slug)
        {
            var category = await _categoryRepository.GetBySlugAsync(slug);
            if (category == null || !category.IsActive) return null;

            return new CategoryDto
            {
                Id = category.Id,
                Name = category.Name,
                Slug = category.Slug,
                Description = category.Description,
                ParentCategoryId = category.ParentCategoryId,
                ImageUrl = category.ImageUrl,
                IsActive = category.IsActive,
                DisplayOrder = category.DisplayOrder
            };
        }
    }
}