// src/Webshop.Application/Services/ProductService.cs
using Webshop.Application.DTOs;
using Webshop.Domain.Entities;
using Webshop.Domain.Interfaces;

namespace Webshop.Application.Services
{
    public class ProductService
    {
        private readonly IProductRepository _productRepository;

        public ProductService(IProductRepository productRepository)
        {
            _productRepository = productRepository;
        }

        public async Task<IEnumerable<ProductDto>> GetAllProductsAsync()
        {
            var productsFromDb = await _productRepository.GetAllProductsAsync();

            var productDtos = productsFromDb.Select(p => new ProductDto
            {
                Id = p.Id,
                Name = p.Name,
                Description = p.Description,
                Price = p.Price,
                Sku = p.SKU
            });

            return productDtos;
        }

        public async Task<ProductDto> CreateProductAsync(ProductDto productDto)
        {
            var newProduct = new Product
            {
                // Felder aus DTO
                Name = productDto.Name,
                Description = productDto.Description,
                Price = productDto.Price,
                SKU = productDto.Sku,
                ShortDescription = productDto.ShortDescription,
                IsActive = productDto.IsActive,
                IsInStock = productDto.IsInStock,
                StockQuantity = productDto.StockQuantity,
                Slug = productDto.Slug,


                Id = Guid.NewGuid(),
                CreatedDate = DateTimeOffset.UtcNow,
                LastModifiedDate = null,

            };

            if (string.IsNullOrWhiteSpace(newProduct.Slug) && !string.IsNullOrWhiteSpace(newProduct.Name))
            {
                newProduct.Slug = GenerateSlug(newProduct.Name);
            }

            await _productRepository.AddProductAsync(newProduct);

            productDto.Id = newProduct.Id;
            return productDto;
        }

        private string GenerateSlug(string name)
        {
            if (string.IsNullOrWhiteSpace(name)) return Guid.NewGuid().ToString(); // Fallback
            var slug = name.ToLowerInvariant()
                           .Replace(" ", "-")
                           .Replace("ä", "ae").Replace("ö", "oe").Replace("ü", "ue")
                           .Replace("ß", "ss")
                           .Trim();
            // Entferne ungültige Zeichen
            slug = System.Text.RegularExpressions.Regex.Replace(slug, @"[^a-z0-9-]", "");
            return slug;
        }
    }
}