RhSolutions-Api/RhSolutions.Api/Services/SearchService.cs

using Grpc.Core;
using RhSolutions.Models;
using Microsoft.EntityFrameworkCore;
using RhSolutions.QueryModifiers;

namespace RhSolutions.Api.Services;

public class SearchService : ProductSearch.ProductSearchBase
{
	private RhSolutionsContext _dbContext;
	private IProductTypePredicter _typePredicter;
	private ProductQueryModifierFactory _productQueryModifierFactory;

	public SearchService(RhSolutionsContext dbContext, IProductTypePredicter typePredicter, ProductQueryModifierFactory productQueryModifierFactory)
	{
		_dbContext = dbContext;
		_typePredicter = typePredicter;
		_productQueryModifierFactory = productQueryModifierFactory;
	}
	public override async Task<ProductReply?> GetProduct(ProductRequest request, ServerCallContext context)
	{
		var productType = _typePredicter.GetPredictedProductType(request.Query);
		var modifier = _productQueryModifierFactory.GetModifier(productType!);
		string query = request.Query;
		if (modifier.TryQueryModify(query, out var modified))
		{
			query = modified;
		}
		var product = await _dbContext.Products
				.Where(p => EF.Functions.ToTsVector(
					"russian", string.Join(' ', new[] { p.Name, string.Join(' ', p.ProductLines) }))
					.Matches(EF.Functions.WebSearchToTsQuery("russian", query)))
				.OrderByDescending(p => p.IsOnWarehouse)
				.FirstOrDefaultAsync();

		if (product != null)
		{
			return new ProductReply()
			{
				Id = product.Id,
				Name = product.Name,
				Price = (double)product.Price
			};
		}
		return null;
	}
}