using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;

namespace BuzzGUI.Interfaces
{
	[StructLayout(LayoutKind.Sequential)]
	public struct PatternEvent
	{
		public const int TimeBase = 240;			// ticks per one buzz tick

		public PatternEvent(int time, int value, int duration = 0) { Time = time; Value = value; Duration = duration; }

		public int Time;							// 0 <= Time < Pattern.Length * TimeBase
		public int Value;
		public int Duration;						// duration for midi note on events (if negative, there will be no associated note off event)
	}

	public enum PatternColumnType { Parameter, MIDI };

	public interface IPatternColumn : INotifyPropertyChanged
	{
		PatternColumnType Type { get; }
		IPattern Pattern { get; }
		IMachine Machine { get; set; }				// this can be changed after the column is created if Type == MIDI
		IParameter Parameter { get; }
		int Track { get; }

		//IDictionary<int, int> Guides { get; }		// time, step pairs (similar to sequence editor time signatures)
		ReadOnlyDictionary<int, int> BeatSubdivision { get; }
		IDictionary<string, string> Metadata { get; }

		IEnumerable<PatternEvent> GetEvents(int tbegin, int tend);		// tbegin <= t < tend
		void SetEvents(IEnumerable<PatternEvent> e, bool set);

		void SetBeatSubdivision(int beatindex, int subdiv);

		event Action<IEnumerable<PatternEvent>, bool> EventsChanged;
		event Action<int> BeatSubdivisionChanged;
	}
}