using ClawdDotNet.Core.Api.Models;

namespace ClawdDotNet.Core.Tests.Infrastructure;

/// <summary>
/// Baut gültige Nachrichtenfolgen für Tests — lesbar und garantiert API-konform.
/// </summary>
internal sealed class Conversation
{
    private readonly List<ChatMessage> _messages = new();
    private int _callCounter;

    public static Conversation Start(string? systemPrompt = "Du bist ein Testagent.")
    {
        var c = new Conversation();
        if (!string.IsNullOrEmpty(systemPrompt))
            c._messages.Add(ChatMessage.System(systemPrompt));
        return c;
    }

    public Conversation User(string text)
    {
        _messages.Add(ChatMessage.User(text));
        return this;
    }

    public Conversation Assistant(string text)
    {
        _messages.Add(ChatMessage.Assistant(text));
        return this;
    }

    /// <summary>
    /// Fügt einen vollständigen Tool-Zyklus hinzu: assistant mit N tool_calls,
    /// gefolgt von genau N passenden tool-Antworten.
    /// </summary>
    public Conversation ToolCycle(int count = 1, int resultLength = 50, string toolName = "TestTool")
    {
        var calls = new List<ToolCall>();
        for (var i = 0; i < count; i++)
        {
            calls.Add(new ToolCall
            {
                Id = $"call_{++_callCounter}",
                Type = "function",
                Function = new ToolCallFunction { Name = toolName, Arguments = """{"action":"test"}""" }
            });
        }

        _messages.Add(ChatMessage.AssistantWithToolCalls(calls));
        foreach (var call in calls)
            _messages.Add(ChatMessage.ToolResponse(call.Id, new string('x', resultLength)));

        return this;
    }

    /// <summary>Wiederholt ein Muster aus User-Nachricht und Tool-Zyklus.</summary>
    public Conversation Repeat(int times, int toolCallsPerCycle = 1, int resultLength = 50)
    {
        for (var i = 0; i < times; i++)
            User($"Anfrage {i}").ToolCycle(toolCallsPerCycle, resultLength).Assistant($"Antwort {i}");
        return this;
    }

    public List<ChatMessage> Build() => _messages;

    public static implicit operator List<ChatMessage>(Conversation c) => c._messages;
}