using System.Text.Json.Serialization;

/// <summary>
/// Base implementation for recorded metrics, add "JsonPropertyName" on properties for labels, and override GetHashCode
/// </summary>
public interface IMetric
{
	[JsonInclude, JsonPropertyName( "__name__" )]
	public string Name { get; }
	public int GetHashCode();
}

public class MetricStreamEntry
{
	[JsonInclude, JsonPropertyName( "metric" )]
	public object Metric { get; set; }
	[JsonInclude, JsonPropertyName( "values" )]
	public List<float> values = new();
	[JsonInclude, JsonPropertyName( "timestamps" )]
	public List<long> timestamps = new();
	public override string ToString()
	{
		IMetric m = (IMetric)Metric;
		TypeDescription td = TypeLibrary.GetType( m.GetType() );
		var met = $"{td.ClassName} - {td.GetHashCode()}";
		return $"MetricEntry for '{met}', values: {values.Count}";
	}
	/// <summary>
	/// record a metric at a specific point in time
	/// </summary>
	public void Backfill( long unixTime, float value )
	{
		values.Add( value );
		timestamps.Add( unixTime );
	}
	/// <summary>
	/// add a value to a metric now
	/// </summary>
	public void Add( float value )
	{
		Backfill( DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(), values.LastOrDefault( 0 ) + value );
	}
	/// <summary>
	/// Add 1 to a metric
	/// </summary>
	public void Increment()
	{
		Add( 1 );
	}
	/// <summary>
	/// Set metric to value now
	/// </summary>
	public void Set( float value )
	{
		Backfill( DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(), value );
	}
}