TASK-1

.gitignore

@@ -1 +1,3 @@
 .obsidian/
+**/bin/
+**/obj/

Mapper.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mapper", "src/Mapper/Mapper.csproj", "{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mapper.Tests", "src/Mapper.Tests/Mapper.Tests.csproj", "{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

README.md

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+# Mapper
+
+Библиотека на C# для преобразования `JsonPatchDocument<TSource>` в `JsonPatchDocument<TTarget>`.
+
+## Что реализовано
+
+- мэппинг одноимённых полей по умолчанию;
+- автоматическая конвертация значения при различии типов;
+- явное переименование целевого поля через `ForMember(...).MapFrom(...)`;
+- игнорирование поля через `ForMember(...).Ignore()`;
+- вычисляемое преобразование значения из одного исходного поля.
+
+## Структура
+
+- [src/Mapper.sln](/home/me/projects/mapper/src/Mapper.sln) — solution в папке исходников;
+- [src/Mapper](/home/me/projects/mapper/src/Mapper) — библиотека;
+- [src/Mapper.Tests](/home/me/projects/mapper/src/Mapper.Tests) — тесты `xUnit`.
+
+## Использование
+
+```csharp
+public sealed class RequestProfile : MapProfile
+{
+    public RequestProfile()
+    {
+        CreateMap<SourceModel, TargetModel>()
+            .ForMember(target => target.DisplayName, options => options.MapFrom(source => source.Name));
+    }
+}
+
+var mapper = new Mapper(new RequestProfile());
+var targetPatch = mapper.Map<SourceModel, TargetModel>(sourcePatch);
+```
+
+## Тесты
+
+Из корня репозитория:
+
+```bash
+dotnet test
+```

TASK-1.md

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+Создай проект по описанию из PROJECT.md

homeworks/hw-0/prompt.md

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+@TASK-1

homeworks/hw-0/report.md

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+Что сделал агент?
+- создал проект
+- наполнил его функциональностью по спеке
+- сбилдил (подтянув нужное через mise)
+- кажется, запускал тесты
+
+Какие файлы он изменил или собирался изменить?
+- полностью создал запускаемый проект
+
+Как вы проверили результат?
+- поверил агенту, что проект билдится
+- просмотрел исходники глазами
+
+Где агент ошибся или потерял контекст?
+- по задумке мэппинг должен настраиваться с помощью кодогенерации, а он повел как-то не так
+
+В каком месте вам захотелось его остановить?
+- не захотелось
+
+Какие 3-5 уточнений вы бы добавили в следующий заход?
+- нужно как-то направить реализацию в нужное русло. Пока не сформулировал

src/Directory.Build.props

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+<Project>
+  <PropertyGroup>
+    <LangVersion>latest</LangVersion>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+  </PropertyGroup>
+</Project>

src/Mapper.Tests/Mapper.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <IsTestProject>true</IsTestProject>
+    <RootNamespace>Mapper.Tests</RootNamespace>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="coverlet.collector" Version="6.0.2" />
+    <PackageReference Include="Microsoft.AspNetCore.JsonPatch" Version="8.0.24" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
+    <PackageReference Include="xunit" Version="2.9.2" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\Mapper\Mapper.csproj" />
+  </ItemGroup>
+</Project>

src/Mapper.Tests/MapperTests.cs

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+using Microsoft.AspNetCore.JsonPatch;
+using Microsoft.AspNetCore.JsonPatch.Operations;
+using Xunit;
+
+namespace Mapper.Tests;
+
+public sealed class MapperTests
+{
+    [Fact]
+    public void Map_Maps_Add_Replace_Remove_And_Test_For_Same_Named_Members()
+    {
+        var mapper = new global::Mapper.Mapper(new DefaultProfile());
+        var patch = CreatePatch<SourceModel>(
+            Operation<SourceModel>("add", "/Name", value: "Alice"),
+            Operation<SourceModel>("replace", "/Age", value: 42),
+            Operation<SourceModel>("remove", "/Name"),
+            Operation<SourceModel>("test", "/Age", value: 42));
+
+        var mapped = mapper.Map<SourceModel, TargetModel>(patch);
+
+        Assert.Collection(
+            mapped.Operations,
+            operation =>
+            {
+                Assert.Equal("add", operation.op);
+                Assert.Equal("/Name", operation.path);
+                Assert.Equal("Alice", operation.value);
+            },
+            operation =>
+            {
+                Assert.Equal("replace", operation.op);
+                Assert.Equal("/Age", operation.path);
+                Assert.Equal(42L, operation.value);
+            },
+            operation =>
+            {
+                Assert.Equal("remove", operation.op);
+                Assert.Equal("/Name", operation.path);
+            },
+            operation =>
+            {
+                Assert.Equal("test", operation.op);
+                Assert.Equal("/Age", operation.path);
+                Assert.Equal(42L, operation.value);
+            });
+    }
+
+    [Fact]
+    public void Map_Maps_To_Target_Member_With_Different_Name()
+    {
+        var mapper = new global::Mapper.Mapper(new RenameProfile());
+        var patch = CreatePatch<SourceModel>(Operation<SourceModel>("replace", "/Name", value: "Bob"));
+
+        var mapped = mapper.Map<SourceModel, RenamedTargetModel>(patch);
+
+        var operation = Assert.Single(mapped.Operations);
+        Assert.Equal("/DisplayName", operation.path);
+        Assert.Equal("Bob", operation.value);
+    }
+
+    [Fact]
+    public void Map_Converts_Value_When_Target_Type_Differs()
+    {
+        var mapper = new global::Mapper.Mapper(new ComputedProfile());
+        var patch = CreatePatch<SourceStatusModel>(Operation<SourceStatusModel>("replace", "/Status", value: "Active"));
+
+        var mapped = mapper.Map<SourceStatusModel, TargetStatusModel>(patch);
+
+        var operation = Assert.Single(mapped.Operations);
+        Assert.Equal("/Status", operation.path);
+        Assert.Equal(TargetStatus.Active, operation.value);
+    }
+
+    [Fact]
+    public void Map_Skips_Ignored_Target_Member()
+    {
+        var mapper = new global::Mapper.Mapper(new IgnoreProfile());
+        var patch = CreatePatch<SourceModel>(Operation<SourceModel>("replace", "/Name", value: "Ignored"));
+
+        var mapped = mapper.Map<SourceModel, TargetModel>(patch);
+
+        Assert.Empty(mapped.Operations);
+    }
+
+    private static JsonPatchDocument<TModel> CreatePatch<TModel>(params Operation<TModel>[] operations)
+        where TModel : class
+    {
+        var patch = new JsonPatchDocument<TModel>();
+        foreach (var operation in operations)
+        {
+            patch.Operations.Add(operation);
+        }
+
+        return patch;
+    }
+
+    private static Operation<TModel> Operation<TModel>(string op, string path, string? from = null, object? value = null)
+        where TModel : class =>
+        new()
+        {
+            op = op,
+            path = path,
+            from = from,
+            value = value
+        };
+
+    private sealed class DefaultProfile : global::Mapper.MapProfile
+    {
+        public DefaultProfile()
+        {
+            CreateMap<SourceModel, TargetModel>();
+        }
+    }
+
+    private sealed class RenameProfile : global::Mapper.MapProfile
+    {
+        public RenameProfile()
+        {
+            CreateMap<SourceModel, RenamedTargetModel>()
+                .ForMember(target => target.DisplayName, options => options.MapFrom(source => source.Name));
+        }
+    }
+
+    private sealed class ComputedProfile : global::Mapper.MapProfile
+    {
+        public ComputedProfile()
+        {
+            CreateMap<SourceStatusModel, TargetStatusModel>()
+                .ForMember(
+                    target => target.Status,
+                    options => options.MapFrom<TargetStatus?>(source => string.IsNullOrWhiteSpace(source.Status)
+                        ? null
+                        : Enum.Parse<TargetStatus>(source.Status, true)));
+        }
+    }
+
+    private sealed class IgnoreProfile : global::Mapper.MapProfile
+    {
+        public IgnoreProfile()
+        {
+            CreateMap<SourceModel, TargetModel>()
+                .ForMember(target => target.Name, options => options.Ignore());
+        }
+    }
+
+    private sealed class SourceModel
+    {
+        public string? Name { get; set; }
+
+        public int Age { get; set; }
+    }
+
+    private sealed class TargetModel
+    {
+        public string? Name { get; set; }
+
+        public long Age { get; set; }
+    }
+
+    private sealed class RenamedTargetModel
+    {
+        public string? DisplayName { get; set; }
+    }
+
+    private sealed class SourceStatusModel
+    {
+        public string? Status { get; set; }
+    }
+
+    private sealed class TargetStatusModel
+    {
+        public TargetStatus? Status { get; set; }
+    }
+
+    private enum TargetStatus
+    {
+        Unknown = 0,
+        Active = 1
+    }
+}

src/Mapper.sln

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+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mapper", "Mapper/Mapper.csproj", "{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Mapper.Tests", "Mapper.Tests/Mapper.Tests.csproj", "{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{3FA4B596-73B9-4C77-8B7C-C6E1449BE3EB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CB54888B-6954-449C-8FF4-0A1F95A4F4C0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal