DeutschLernen/GermanApp/Application/Models/MistralRequest.cs

using System.Text.Json.Serialization;

namespace GermanApp.Application.Models;

/// <summary>
/// Request model for Mistral completion API.
/// Used for text generation (stories, feedback, etc.).
/// </summary>
/// <remarks>
/// See: https://docs.mistral.ai/api/#operation/createCompletion
/// </remarks>
public record MistralRequest
{
    /// <summary>
    /// ID of the model to use.
    /// </summary>
    public string Model { get; init; } = "mistral-medium";

    /// <summary>
    /// The prompt(s) to generate completions for.
    /// </summary>
    public string Prompt { get; init; } = string.Empty;

    /// <summary>
    /// The maximum number of tokens to generate in the completion.
    /// Default: 256, Max: 2048 for mistral-medium
    /// </summary>
    public int? MaxTokens { get; init; } = 512;

    /// <summary>
    /// What sampling temperature to use.
    /// Higher values means the model will take more risks. Try 0.9 for more creative applications, and 0 for ones with a well-defined answer.
    /// Default: 0.7
    /// </summary>
    public double? Temperature { get; init; } = 0.7;

    /// <summary>
    /// Nucleus sampling, where the model considers the results of the tokens with top_p probability mass.
    /// So 0.1 means only the tokens comprising the top 10% probability mass are considered.
    /// Default: 1.0
    /// </summary>
    public double? TopP { get; init; } = 1.0;

    /// <summary>
    /// How many completions to generate for each prompt.
    /// Default: 1
    /// </summary>
    public int? N { get; init; } = 1;

    /// <summary>
    /// Whether to stream partial responses.
    /// Not supported by this connector (use streaming endpoint separately if needed).
    /// </summary>
    public bool? Stream { get; init; } = false;

    /// <summary>
    /// Whether to echo the prompt in the response.
    /// Default: false
    /// </summary>
    public bool? Echo { get; init; } = false;

    /// <summary>
    /// Up to 4 sequences where the API will stop generating further tokens.
    /// </summary>
    public IReadOnlyList<string>? Stop { get; init; }

    /// <summary>
    /// Number between -2.0 and 2.0. Positive values penalize new tokens based on their frequency in the text so far.
    /// </summary>
    public double? FrequencyPenalty { get; init; }

    /// <summary>
    /// Number between -2.0 and 2.0. Positive values penalize new tokens based on whether they appear in the text so far.
    /// </summary>
    public double? PresencePenalty { get; init; }

    /// <summary>
    /// User identifier for tracking usage.
    /// </summary>
    public string? User { get; init; }

    /// <summary>
    /// Factory method to create a completion request with default settings.
    /// </summary>
    public static MistralRequest CreateCompletion(string prompt, string model = "mistral-medium", int maxTokens = 512)
    {
        return new MistralRequest
        {
            Model = model,
            Prompt = prompt,
            MaxTokens = maxTokens,
            Temperature = 0.7,
            TopP = 1.0,
            N = 1,
            Stream = false,
            Echo = false
        };
    }
}

/// <summary>
/// Request model for Mistral chat completion API.
/// Used for conversational text generation.
/// </summary>
/// <remarks>
/// See: https://docs.mistral.ai/api/#operation/createChatCompletion
/// </remarks>
public record MistralChatRequest
{
    /// <summary>
    /// ID of the model to use.
    /// </summary>
    [JsonPropertyName("model")]
    public string Model { get; init; } = "mistral-small-latest";

    /// <summary>
    /// A list of messages comprising the conversation so far.
    /// </summary>
    [JsonPropertyName("messages")]
    public IReadOnlyList<MistralMessage> Messages { get; init; } = new List<MistralMessage>();

    /// <summary>
    /// The maximum number of tokens to generate in the completion.
    /// </summary>
    [JsonPropertyName("max_tokens")]
    public int? MaxTokens { get; init; }

    /// <summary>
    /// What sampling temperature to use.
    /// </summary>
    [JsonPropertyName("temperature")]
    public double? Temperature { get; init; }

    /// <summary>
    /// Factory method to create a chat request.
    /// </summary>
    public static MistralChatRequest CreateChat(IReadOnlyList<MistralMessage> messages, string model = "mistral-small-latest", int maxTokens = 512)
    {
        return new MistralChatRequest
        {
            Model = model,
            Messages = messages,
            MaxTokens = maxTokens,
            Temperature = 0.7
        };
    }
}

/// <summary>
/// Represents a message in a Mistral chat conversation.
/// </summary>
public record MistralMessage
{
    /// <summary>
    /// The role of the message author.
    /// </summary>
    [JsonPropertyName("role")]
    public string Role { get; init; } = string.Empty;

    /// <summary>
    /// The content of the message.
    /// </summary>
    [JsonPropertyName("content")]
    public string Content { get; init; } = string.Empty;

    /// <summary>
    /// Factory method to create a user message.
    /// </summary>
    public static MistralMessage User(string content) => new() { Role = "user", Content = content };

    /// <summary>
    /// Factory method to create an assistant message.
    /// </summary>
    public static MistralMessage Assistant(string content) => new() { Role = "assistant", Content = content };

    /// <summary>
    /// Factory method to create a system message.
    /// </summary>
    public static MistralMessage System(string content) => new() { Role = "system", Content = content };
}

/// <summary>
/// Model information from Mistral API.
/// </summary>
public record MistralModel
{
    /// <summary>
    /// The model identifier.
    /// </summary>
    public string Id { get; init; } = string.Empty;

    /// <summary>
    /// The model object type.
    /// </summary>
    public string Object { get; init; } = string.Empty;

    /// <summary>
    /// When the model was created.
    /// </summary>
    public long Created { get; init; }

    /// <summary>
    /// The model's description.
    /// </summary>
    public string Description { get; init; } = string.Empty;
}