ML.Net query modifier implementation

.gitignore

@@ -452,3 +452,4 @@ $RECYCLE.BIN/
 !.vscode/tasks.json
 !.vscode/launch.json
 !.vscode/extensions.json
+/RhSolutions.Api/MLModels

RhSolutions.Api/Middleware/QueryModifier.cs

@@ -0,0 +1,30 @@
+using Microsoft.AspNetCore.Http.Extensions;
+using RhSolutions.Api.Services;
+
+namespace RhSolutions.Api.Middleware;
+
+public class QueryModifier
+{
+    private RequestDelegate _next;
+
+    public QueryModifier(RequestDelegate nextDelegate)
+    {
+        _next = nextDelegate;
+    }
+
+    public async Task Invoke(HttpContext context, IProductTypePredicter typePredicter, ProductQueryModifierFactory productQueryModifierFactory)
+    {
+        if (context.Request.Method == HttpMethods.Get
+                && context.Request.Path == "/api/search")
+        {
+            string query = context.Request.Query["query"].ToString();
+            var productType = typePredicter.GetPredictedProductType(query);
+            var modifier = productQueryModifierFactory.GetModifier(productType!);
+            if (modifier.TryQueryModify(context.Request.Query, out var newQuery))
+            {
+                context.Request.QueryString = newQuery;
+            }
+        }
+        await _next(context);
+    }
+}

RhSolutions.Api/Program.cs

@@ -1,6 +1,7 @@
 using Microsoft.EntityFrameworkCore;
 using RhSolutions.Models;
 using RhSolutions.Api.Services;
+using RhSolutions.Api.Middleware;
 
 var builder = WebApplication.CreateBuilder(args);
 
@@ -21,12 +22,15 @@ builder.Services.AddDbContext<RhSolutionsContext>(opts =>
 		opts.EnableSensitiveDataLogging(true);
 	}
 });
-builder.Services.AddScoped<IPricelistParser, ClosedXMLParser>();
+builder.Services.AddScoped<IPricelistParser, ClosedXMLParser>()
+	.AddScoped<IProductTypePredicter, ProductTypePredicter>()
+	.AddSingleton<ProductQueryModifierFactory>();
 builder.Services.AddControllers();
 
 var app = builder.Build();
 
 app.MapControllers();
+app.UseMiddleware<QueryModifier>();
 
 var context = app.Services.CreateScope().ServiceProvider
 	.GetRequiredService<RhSolutionsContext>();

RhSolutions.Api/RhSolutions.Api.csproj

@@ -13,9 +13,16 @@
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.ML" Version="2.0.1" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="7.0.4" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.Design" Version="1.1.0" />
     <PackageReference Include="Rhsolutions.ProductSku" Version="1.0.0" />
   </ItemGroup>
 
+  <ItemGroup>
+    <None Update="MLModels\model.zip">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
 </Project>

RhSolutions.Api/Services/BypassQueryModifier.cs

@@ -0,0 +1,11 @@
+namespace RhSolutions.Api.Services
+{
+    public class BypassQueryModifier : IProductQueryModifier
+    {
+        public bool TryQueryModify(IQueryCollection collection, out QueryString queryString)
+        {
+            queryString = QueryString.Empty;
+            return false;
+        }
+    }
+}

RhSolutions.Api/Services/IProductQueryModifier.cs

@@ -0,0 +1,7 @@
+namespace RhSolutions.Api.Services
+{
+    public interface IProductQueryModifier
+    {
+        public bool TryQueryModify(IQueryCollection collection, out QueryString queryString);
+    }
+}

RhSolutions.Api/Services/IProductTypePredicter.cs

@@ -0,0 +1,6 @@
+namespace RhSolutions.Api.Services;
+
+public interface IProductTypePredicter
+{
+    public string? GetPredictedProductType(string productName);
+}

RhSolutions.Api/Services/ProductQueryModifierFactory.cs

@@ -0,0 +1,15 @@
+namespace RhSolutions.Api.Services;
+
+public class ProductQueryModifierFactory
+{
+    public IProductQueryModifier GetModifier(string productTypeName)
+    {
+        switch (productTypeName)
+        {
+            case "Тройник RAUTITAN":
+                return new TPieceQueryModifier();
+            default:
+                return new BypassQueryModifier();
+        }
+    }
+}

RhSolutions.Api/Services/ProductTypePredicter.cs

@@ -0,0 +1,44 @@
+using Microsoft.ML;
+using Microsoft.ML.Data;
+
+namespace RhSolutions.Api.Services;
+
+public class ProductTypePredicter : IProductTypePredicter
+{
+    private readonly string _modelPath = @"./MLModels/model.zip";
+    private MLContext _mlContext;
+    private ITransformer _loadedModel;
+    private PredictionEngine<Product, TypePrediction> _predEngine;
+
+    public ProductTypePredicter()
+    {
+        _mlContext = new MLContext(seed: 0);
+        _loadedModel = _mlContext.Model.Load(_modelPath, out var _);
+        _predEngine = _mlContext.Model.CreatePredictionEngine<Product, TypePrediction>(_loadedModel);
+    }
+
+    public string? GetPredictedProductType(string productName)
+    {
+        Product p = new()
+        {
+            Name = productName
+        };
+        var prediction = _predEngine.Predict(p);
+        return prediction.Type;
+    }
+
+    public class Product
+    {
+        [LoadColumn(0)]
+        public string? Name { get; set; }
+        [LoadColumn(1)]
+        public string? Type { get; set; }
+    }
+
+    public class TypePrediction
+    {
+        [ColumnName("PredictedLabel")]
+        public string? Type { get; set; }
+    }
+}
+

RhSolutions.Api/Services/TPieceQueryModifier.cs

@@ -0,0 +1,42 @@
+using Microsoft.AspNetCore.Http.Extensions;
+using System.Text;
+using System.Text.RegularExpressions;
+
+namespace RhSolutions.Api.Services
+{
+    public class TPieceQueryModifier : IProductQueryModifier
+    {
+        private readonly string pattern = @"(\b16|20|25|32|40|50|63\b)+";
+
+        public bool TryQueryModify(IQueryCollection collection, out QueryString queryString)
+        {
+            queryString = QueryString.Empty;
+            var query = collection["query"].ToString();
+            if (string.IsNullOrEmpty(query)) 
+            {
+                return false;
+            }
+            var matches = Regex.Matches(query, pattern);
+            StringBuilder sb = new();
+            sb.Append("Тройник RAUTITAN -PLATINUM");
+            if (matches.Count == 1)
+            {
+                sb.Append($" {matches.First().Value}-{matches.First().Value}-{matches.First().Value}");
+            }
+            else if (matches.Count >= 3)
+            {
+                sb.Append($" {matches[0].Value}-{matches[1].Value}-{matches[2].Value}");
+            }
+            else
+            {
+                return false;
+            }
+            QueryBuilder qb = new()
+            {
+                { "query", sb.ToString() }
+            };
+            queryString = qb.ToQueryString();
+            return true;
+        }
+    }
+}