namespace AnchorCli.Providers;

/// <summary>
/// Factory for creating provider instances based on endpoint or provider name.
/// </summary>
internal static class ProviderFactory
{
    /// <summary>
    /// Creates a token extractor based on the provider name.
    /// </summary>
    public static ITokenExtractor CreateTokenExtractor(string providerName)
    {
        return providerName.ToLowerInvariant() switch
        {
            "openrouter" => new OpenRouterTokenExtractor(),
            "groq" => new GroqTokenExtractor(),
            "ollama" => new OllamaTokenExtractor(),
            _ => new GenericTokenExtractor()
        };
    }

    /// <summary>
    /// Creates a token extractor by auto-detecting from the endpoint URL.
    /// </summary>
    public static ITokenExtractor CreateTokenExtractorForEndpoint(string endpoint)
    {
        if (string.IsNullOrEmpty(endpoint))
        {
            return new GenericTokenExtractor();
        }

        var url = endpoint.ToLowerInvariant();

        if (url.Contains("openrouter"))
        {
            return new OpenRouterTokenExtractor();
        }

        if (url.Contains("groq"))
        {
            return new GroqTokenExtractor();
        }

        if (url.Contains("ollama") || url.Contains("localhost") || url.Contains("127.0.0.1"))
        {
            return new OllamaTokenExtractor();
        }

        return new GenericTokenExtractor();
    }

    /// <summary>
    /// Creates a pricing provider based on the provider name.
    /// Only OpenRouter has a pricing API currently.
    /// </summary>
    public static IPricingProvider? CreatePricingProvider(string providerName)
    {
        return providerName.ToLowerInvariant() switch
        {
            "openrouter" => new OpenRouterProvider(),
            _ => null  // Other providers don't have pricing APIs yet
        };
    }

    /// <summary>
    /// Determines if an endpoint is OpenRouter.
    /// </summary>
    public static bool IsOpenRouter(string endpoint) =>
        !string.IsNullOrEmpty(endpoint) && endpoint.Contains("openrouter", StringComparison.OrdinalIgnoreCase);
}