gott/Models/ChatModels.cs

using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Gott.Models;

public class ChatMessage
{
    [JsonPropertyName("role")]
    public string Role { get; set; } = "";

    [JsonPropertyName("content")]
    public JsonElement Content { get; set; }

    /// <summary>
    /// Extrahiert den reinen Text aus Content (egal ob string oder content-block array).
    /// </summary>
    public string GetTextContent()
    {
        if (Content.ValueKind == JsonValueKind.String)
            return Content.GetString() ?? "";

        if (Content.ValueKind == JsonValueKind.Array)
        {
            var parts = new List<string>();
            foreach (var block in Content.EnumerateArray())
            {
                if (block.TryGetProperty("type", out var t) && t.GetString() == "text"
                    && block.TryGetProperty("text", out var txt))
                    parts.Add(txt.GetString() ?? "");
            }
            return string.Join("\n", parts);
        }

        return Content.ToString();
    }

    /// <summary>
    /// Prüft ob Datei-Attachments (image/document) enthalten sind.
    /// </summary>
    public bool HasAttachments()
    {
        if (Content.ValueKind != JsonValueKind.Array) return false;
        foreach (var block in Content.EnumerateArray())
        {
            if (block.TryGetProperty("type", out var t))
            {
                var type = t.GetString();
                if (type == "image" || type == "document") return true;
            }
        }
        return false;
    }

    /// <summary>
    /// Gibt Attachment-Infos zurück (type + media_type).
    /// </summary>
    public List<AttachmentInfo> GetAttachments()
    {
        var result = new List<AttachmentInfo>();
        if (Content.ValueKind != JsonValueKind.Array) return result;
        foreach (var block in Content.EnumerateArray())
        {
            if (block.TryGetProperty("type", out var t))
            {
                var type = t.GetString();
                if (type == "image" || type == "document")
                {
                    var mediaType = "";
                    if (block.TryGetProperty("source", out var src) && src.TryGetProperty("media_type", out var mt))
                        mediaType = mt.GetString() ?? "";
                    result.Add(new AttachmentInfo { Type = type, MediaType = mediaType });
                }
            }
        }
        return result;
    }

    /// <summary>
    /// Gibt vollständige Attachment-Blöcke zurück (inkl. Base64-Daten).
    /// </summary>
    public List<AttachmentBlock> GetAttachmentBlocks()
    {
        var result = new List<AttachmentBlock>();
        if (Content.ValueKind != JsonValueKind.Array) return result;
        foreach (var block in Content.EnumerateArray())
        {
            if (block.TryGetProperty("type", out var t))
            {
                var type = t.GetString();
                if (type == "image" || type == "document")
                {
                    var mediaType = "";
                    var data = "";
                    var fileName = "";
                    if (block.TryGetProperty("source", out var src))
                    {
                        if (src.TryGetProperty("media_type", out var mt))
                            mediaType = mt.GetString() ?? "";
                        if (src.TryGetProperty("data", out var d))
                            data = d.GetString() ?? "";
                    }
                    if (block.TryGetProperty("_file_name", out var fn))
                        fileName = fn.GetString() ?? "";
                    result.Add(new AttachmentBlock { Type = type, MediaType = mediaType, Data = data, FileName = fileName });
                }
            }
        }
        return result;
    }
}

public class AttachmentBlock
{
    public string Type { get; set; } = "";
    public string MediaType { get; set; } = "";
    public string Data { get; set; } = "";
    public string FileName { get; set; } = "";
}

public class AttachmentInfo
{
    public string Type { get; set; } = "";
    public string MediaType { get; set; } = "";
}

public class ChatRequest
{
    [JsonPropertyName("content")]
    public JsonElement Content { get; set; }

    [JsonPropertyName("sessionId")]
    public string SessionId { get; set; } = "";
}