using ClawdDotNet.App.Services;
using ClawdDotNet.App.Settings;
using ClawdDotNet.Core.Config;
using ClawdDotNet.Core.Tools;
using Microsoft.Extensions.Logging.Abstractions;
using ClawdDotNet.Core.Instances;

namespace ClawdDotNet.App.Tests.Services;

/// <summary>
/// An <see cref="AppHost"/> without engine, scanner and network — enough for the
/// administration services.
///
/// <para>This is possible because <c>AppHost.StartAsync</c> is only <em>one</em> way to
/// build one: the properties are <c>required init</c>, nothing more is needed. What
/// is missing here — <c>Engine</c>, <c>Scanner</c>, <c>Staging</c> — is regularly null in operation
/// too, and exactly that behavior is to be tested.</para>
/// </summary>
internal sealed class TestHost : IDisposable
{
    private readonly string _root;

    public AppHost Host { get; }

    /// <summary>Every change that went through <c>SaveInstance</c>.</summary>
    public List<InstanceChange> Changes { get; } = [];

    public TestHost(params AgentConfig[] agents)
    {
        _root = Path.Combine(
            Path.GetTempPath(), "clawd-tests", "host-" + Guid.NewGuid().ToString("N")[..8]);

        var instancesDir = Path.Combine(_root, "Instances");
        var instancePath = Path.Combine(instancesDir, "Test");

        Directory.CreateDirectory(instancePath);

        var instance = new InstanceConfig { InstanceName = "Test" };
        instance.Agents.AddRange(agents);

        Host = new AppHost
        {
            Settings = new SettingsManager(_root),
            Directories = new InstanceDirectoryManager(instancesDir),
            Instance = instance,
            InstancePath = instancePath,
            LogDirectory = Path.Combine(_root, "Logs"),
            LoggerFactory = NullLoggerFactory.Instance,
            Tools = new ToolRegistry()
        };

        Host.InstanceChanged += Changes.Add;
    }

    public void Dispose()
    {
        try { Directory.Delete(_root, recursive: true); }
        catch { /* A leftover test folder is no reason to turn a run red. */ }
    }

    public static AgentConfig Agent(string agentId, string displayName = "")
        => new()
        {
            AgentId = agentId,
            DisplayName = displayName.Length == 0 ? agentId : displayName,
            Model = "anthropic/claude-sonnet-4-5"
        };
}