namespace Deal.Ai.Llm;

/// <summary>
/// Эффективный конфиг LLM-провайдера на один вызов
/// </summary>
public sealed record LlmConfig(
    string ProviderId,
    string BaseUrl,
    string Model,
    string? ApiKey,
    string? ApiStyle)
{
    /// <summary>
    /// Значение api_style для Anthropic Messages API
    /// </summary>
    public const string AnthropicApiStyle = "anthropic";

    private static readonly IReadOnlyDictionary<string, string> KnownProviderNames =
        new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase)
        {
            ["deepseek"] = "DeepSeek",
            ["openai"] = "OpenAI",
            ["openrouter"] = "OpenRouter",
            ["anthropic"] = "Anthropic Claude",
            ["ollama"] = "Ollama (локально)",
            ["lmstudio"] = "LM Studio (локально)",
            ["custom"] = "Другой (OpenAI-совместимый)",
        };

    /// <summary>
    /// Истинно, когда конфиг задаёт Anthropic Messages API
    /// </summary>
    public bool IsAnthropic => string.Equals(ApiStyle, AnthropicApiStyle, StringComparison.OrdinalIgnoreCase);

    /// <summary>
    /// Имя провайдера для сообщений об ошибках и логов
    /// </summary>
    public string DisplayName => KnownProviderNames.TryGetValue(ProviderId, out string? name)
        ? name
        : ProviderId;
}