namespace YoutubeSummarizer.Configuration;

/// <summary>
/// Root configuration object bound from appsettings.json.
/// Only OpenAI and Summarizer sections are required.
/// </summary>
public sealed class AppSettings
{
    public LlmSettings LLM { get; init; } = new();
    public SummarizerSettings Summarizer { get; init; } = new();
}

/// <summary>
/// Settings for the LLM API (OpenAI or Ollama).
/// </summary>
public sealed class LlmSettings
{
    /// <summary>
    /// Base URL for the API. 
    /// For OpenAI: https://api.openai.com/v1
    /// For Ollama: http://localhost:11434/v1
    /// </summary>
    public string BaseUrl { get; init; } = "https://api.openai.com/v1";

    /// <summary>Your API key. (For Ollama, any value works).</summary>
    public string ApiKey { get; init; } = string.Empty;

    /// <summary>
    /// Model to use. 
    /// OpenAI: gpt-4o-mini, gpt-4o
    /// Ollama: qwen3:14b, llama3.1
    /// </summary>
    public string Model { get; init; } = "gpt-4o-mini";

    /// <summary>Max tokens for the summary response (not the input).</summary>
    public int MaxTokens { get; init; } = 1500;

    /// <summary>Timeout in seconds for API calls.</summary>
    public int TimeoutSeconds { get; init; } = 100;
}

/// <summary>
/// Controls summarization behavior.
/// </summary>
public sealed class SummarizerSettings
{
    /// <summary>
    /// Approximate word count at which we split a long transcript into chunks
    /// before doing a final "summary of summaries" pass. This keeps individual
    /// API calls within model context limits.
    /// </summary>
    public int ChunkWordLimit { get; init; } = 3000;

    /// <summary>When true, prints the full transcript text before summarizing.</summary>
    public bool ShowTranscript { get; init; } = false;
}