using AutoMapper;
using HardwarePerformance.Models.DTOs;
using HardwarePerformance.Repositories;

namespace HardwarePerformance.Services
{
    public class ProductService : IProductService
    {
        private readonly IProductRepository _productRepository;
        private readonly IMapper _mapper;

        public ProductService(IProductRepository productRepository, IMapper mapper)
        {
            _productRepository = productRepository;
            _mapper = mapper;
        }

        public async Task<PagedResultDto<ProductListDto>> GetProductsByCategoryAsync(int categoryId, int page = 1, int pageSize = 20, string sortBy = "CurrentRank", string order = "asc")
        {
            var products = await _productRepository.GetByCategoryAsync(categoryId, page, pageSize, sortBy, order);
            var totalCount = await _productRepository.CountAsync(categoryId);
            
            var productDtos = _mapper.Map<IEnumerable<ProductListDto>>(products);
            
            return new PagedResultDto<ProductListDto>
            {
                Items = productDtos.ToList(),
                Total = totalCount,
                CurrentPage = page,
                PageSize = pageSize,
                TotalPages = (int)Math.Ceiling((double)totalCount / pageSize)
            };
        }

        public async Task<ProductDto?> GetProductByIdAsync(int id)
        {
            var product = await _productRepository.GetByIdAsync(id);
            if (product == null) return null;

            var productDto = _mapper.Map<ProductDto>(product);
            
            // 获取类别信息
            var category = await _productRepository.GetCategoryByProductIdAsync(id);
            if (category != null)
            {
                productDto.Category = new CategoryDto
                {
                    Id = category.Id,
                    Name = category.Name,
                    Description = category.Description
                };
            }

            return productDto;
        }

        public async Task<PagedResultDto<ProductListDto>> SearchProductsAsync(string query, int? categoryId = null, string? manufacturer = null, int? minScore = null, int? maxScore = null, int page = 1, int pageSize = 20)
        {
            var products = await _productRepository.SearchAsync(query, categoryId, manufacturer, minScore, maxScore, page, pageSize);
            var totalCount = await _productRepository.CountSearchResultsAsync(query, categoryId, manufacturer, minScore, maxScore);
            
            var productDtos = _mapper.Map<IEnumerable<ProductListDto>>(products);
            
            return new PagedResultDto<ProductListDto>
            {
                Items = productDtos.ToList(),
                Total = totalCount,
                CurrentPage = page,
                PageSize = pageSize,
                TotalPages = (int)Math.Ceiling((double)totalCount / pageSize)
            };
        }

        public async Task<PagedResultDto<ProductListDto>> FilterProductsAsync(int categoryId, string? manufacturer = null, int? minScore = null, int? maxScore = null, int? releaseYear = null, int page = 1, int pageSize = 20, string sortBy = "CurrentRank", string order = "asc")
        {
            var products = await _productRepository.FilterAsync(categoryId, manufacturer, minScore, maxScore, releaseYear, page, pageSize, sortBy, order);
            var totalCount = await _productRepository.CountFilterResultsAsync(categoryId, manufacturer, minScore, maxScore, releaseYear);
            
            var productDtos = _mapper.Map<IEnumerable<ProductListDto>>(products);
            
            return new PagedResultDto<ProductListDto>
            {
                Items = productDtos.ToList(),
                Total = totalCount,
                CurrentPage = page,
                PageSize = pageSize,
                TotalPages = (int)Math.Ceiling((double)totalCount / pageSize)
            };
        }
    }
}