#nullable enable

using System;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using Godot;
using ShrinkSDK.Installer;

namespace ShrinkSDK.Godot.Editor;

[Tool]
public partial class ShrinkGodotInstallerPlugin : EditorPlugin
{
    private EditorDock? _panel;
    private Label? _status;
    private RichTextLabel? _output;
    private readonly System.Collections.Generic.Dictionary<string, Button> _installActions =
        new(StringComparer.OrdinalIgnoreCase);
    private readonly System.Collections.Generic.Dictionary<string, Button> _removeActions =
        new(StringComparer.OrdinalIgnoreCase);
    private string ProjectDirectory => ProjectSettings.GlobalizePath("res://");
    private string ProjectPath => Directory.GetFiles(ProjectDirectory, "*.csproj", SearchOption.TopDirectoryOnly).Single();

    public override void _EnterTree()
    {
        _panel = new EditorDock { Name = "ShrinkSDK", Title = "ShrinkSDK", DefaultSlot = EditorDock.DockSlot.LeftBr };
        var content = new VBoxContainer();
        _panel.AddChild(content);
        content.AddChild(new Label { Text = "ShrinkSDK Packages" });
        _installActions.Clear();
        _removeActions.Clear();
        foreach (var package in ShrinkProjectPackageEditor.RecommendedPackages)
        {
            var row = new HBoxContainer();
            row.AddChild(new Label { Text = $"{package.Key}  {package.Value}", SizeFlagsHorizontal = Control.SizeFlags.ExpandFill });
            var install = new Button { Text = "Install / Update" };
            install.Pressed += () => ChangePackage(package.Key, package.Value);
            row.AddChild(install);
            _installActions[package.Key] = install;
            var remove = new Button { Text = "Remove" };
            remove.Pressed += () => ChangePackage(package.Key, null);
            row.AddChild(remove);
            _removeActions[package.Key] = remove;
            content.AddChild(row);
        }
        var restore = new Button { Text = "Restore and Build" };
        restore.Pressed += BuildProject;
        content.AddChild(restore);
        _status = new Label { Text = "CodeGen: not built" };
        content.AddChild(_status);
        _output = new RichTextLabel { FitContent = true, CustomMinimumSize = new Vector2(360, 180) };
        content.AddChild(_output);
        AddDock(_panel);
        RefreshInstalledState();
    }

    public override void _ExitTree()
    {
        if (_panel == null) return;
        RemoveDock(_panel);
        _panel.QueueFree();
        _panel = null;
    }

    private async void ChangePackage(string packageId, string? version)
    {
        try
        {
            ShrinkProjectPackageEditor.EnsureShrinkFeed(Path.Combine(ProjectDirectory, "NuGet.Config"));
            ShrinkProjectPackageEditor.SetPackageReference(ProjectPath, packageId, version);
            await RunBuild("restore");
        }
        catch (Exception exception) { ShowFailure(exception); }
    }

    private async void BuildProject()
    {
        try { await RunBuild("build"); }
        catch (Exception exception) { ShowFailure(exception); }
    }

    private async System.Threading.Tasks.Task RunBuild(string command)
    {
        _status!.Text = $"CodeGen: running dotnet {command}";
        var result = await ShrinkProjectPackageEditor.RunDotnetAsync(ProjectDirectory, $"{command} \"{ProjectPath}\" /nr:false");
        _output!.Text = result.Output;
        var match = Regex.Matches(result.Output, @"\[ShrinkSDK\.CodeGen\].*woven: instance=(\d+), static=(\d+), registry=(\d+)").Cast<Match>().LastOrDefault();
        _status.Text = result.ExitCode == 0
            ? match == null ? "CodeGen: build succeeded (no attributed registrations)" : $"CodeGen: woven; instance={match.Groups[1].Value}, static={match.Groups[2].Value}, registry={match.Groups[3].Value}"
            : "CodeGen: build failed";
        RefreshInstalledState();
    }

    private void RefreshInstalledState()
    {
        if (_output == null) return;
        var installed = File.Exists(ProjectPath)
            ? ShrinkProjectPackageEditor.ReadPackageReferences(ProjectPath)
            : new System.Collections.Generic.Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
        foreach (var package in ShrinkProjectPackageEditor.RecommendedPackages)
        {
            var hasInstalled = installed.TryGetValue(package.Key, out var installedVersion);
            var relation = hasInstalled
                ? ShrinkPackageVersion.Classify(installedVersion, package.Value)
                : ShrinkPackageVersionRelation.Unknown;
            if (_installActions.TryGetValue(package.Key, out var install))
            {
                install.Text = !hasInstalled
                    ? $"Install {package.Value}"
                    : relation switch
                    {
                        ShrinkPackageVersionRelation.Equal => $"Installed {installedVersion}",
                        ShrinkPackageVersionRelation.Newer => $"Newer {installedVersion}",
                        ShrinkPackageVersionRelation.Older => $"Upgrade {installedVersion} → {package.Value}",
                        _ => $"Update {installedVersion} → {package.Value}"
                    };
                install.Disabled = hasInstalled && relation is
                    ShrinkPackageVersionRelation.Equal or ShrinkPackageVersionRelation.Newer;
            }
            if (_removeActions.TryGetValue(package.Key, out var remove))
                remove.Disabled = !hasInstalled;
        }
        _output.Text = "Direct packages: " + string.Join(", ", installed.Select(item => $"{item.Key}@{item.Value}"));
    }

    private void ShowFailure(Exception exception)
    {
        _status!.Text = "CodeGen: operation failed";
        _output!.Text = exception.ToString();
        GD.PushError(exception.ToString());
    }
}