#nullable enable

using System;
using System.IO;
using System.Linq;
using System.Xml.Linq;
using ShrinkSDK.Godot.Editor;
using ShrinkSDK.Installer;

var root = Path.Combine(Path.GetTempPath(), "ShrinkSDK.InstallerFixture", Guid.NewGuid().ToString("N"));
Directory.CreateDirectory(root);
try
{
    var project = Path.Combine(root, "Fixture.csproj");
    File.WriteAllText(project, """
        <Project Sdk="Microsoft.NET.Sdk">
          <PropertyGroup><TargetFramework>net8.0</TargetFramework><FixtureValue>keep</FixtureValue></PropertyGroup>
          <ItemGroup>
            <PackageReference Include="Existing.Package" Version="1.2.3" />
            <PackageReference Include="Child.Version.Package"><Version>3.4.5</Version></PackageReference>
          </ItemGroup>
        </Project>
        """);
    var config = Path.Combine(root, "NuGet.Config");
    File.WriteAllText(config, """
        <configuration><packageSources><add key="Existing" value="https://example.invalid/v3/index.json" /></packageSources></configuration>
        """);

    ShrinkProjectPackageEditor.SetPackageReference(project, "ShrinkSDK.EventBus", "2.1.0");
    ShrinkProjectPackageEditor.SetPackageReference(project, "ShrinkSDK.EventBus", "2.1.0");
    var installed = XDocument.Load(project);
    Require(installed.Descendants("PackageReference").Count(element =>
        (string?)element.Attribute("Include") == "ShrinkSDK.EventBus") == 1, "package reference was duplicated");
    Require(installed.ToString().Contains("Existing.Package") && installed.ToString().Contains("FixtureValue"),
        "unrelated project content was changed");
    var installedVersions = ShrinkProjectPackageEditor.ReadPackageReferences(project);
    Require(installedVersions["ShrinkSDK.EventBus"] == "2.1.0", "installed version was not read correctly");
    Require(installedVersions["Child.Version.Package"] == "3.4.5", "child Version element was not read correctly");
    Require(ShrinkPackageVersion.Classify("2.2.0", "2.1.0") == ShrinkPackageVersionRelation.Newer,
        "newer installed version was classified as outdated");
    Require(ShrinkPackageVersion.Classify("2.1.0-preview.10", "2.1.0-preview.2") ==
            ShrinkPackageVersionRelation.Newer, "prerelease versions were not ordered semantically");

    ShrinkProjectPackageEditor.SetPackageReference(project, "ShrinkSDK.EventBus", null);
    Require(!XDocument.Load(project).Descendants("PackageReference").Any(element =>
        (string?)element.Attribute("Include") == "ShrinkSDK.EventBus"), "package reference was not removed");

    ShrinkProjectPackageEditor.EnsureShrinkFeed(config);
    ShrinkProjectPackageEditor.EnsureShrinkFeed(config);
    var sources = XDocument.Load(config).Descendants("add").ToArray();
    Require(sources.Count(element => (string?)element.Attribute("key") == "ShrinkSDK") == 1,
        "ShrinkSDK feed was duplicated");
    Require(sources.Any(element => (string?)element.Attribute("key") == "Existing"),
        "existing NuGet source was removed");
    Console.WriteLine("PASS Godot Installer atomic package/feed install-update-remove merge");
}
finally
{
    Directory.Delete(root, true);
}

static void Require(bool condition, string message)
{
    if (!condition) throw new InvalidOperationException(message);
}