using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Diagnostics.CodeAnalysis;



namespace Microsoft.Research.DynamicDataDisplay.Charts

{

	public sealed class MinorNumericTicksProvider : ITicksProvider<double>

	{

		private readonly ITicksProvider<double> parent;

		private Range<double>[] ranges;

		internal void SetRanges(IEnumerable<Range<double>> ranges)

		{

			this.ranges = ranges.ToArray();

		}



		private double[] coeffs;

		public double[] Coeffs

		{

			get { return coeffs; }

			set

			{

				if (value == null)

					throw new ArgumentNullException("value");



				coeffs = value;

				Changed.Raise(this);

			}

		}



		internal MinorNumericTicksProvider(ITicksProvider<double> parent)

		{

			this.parent = parent;

			Coeffs = new double[] { 0.3, 0.3, 0.3, 0.3, 0.6, 0.3, 0.3, 0.3, 0.3 };

		}



		#region ITicksProvider<double> Members



		public event EventHandler Changed;



		public ITicksInfo<double> GetTicks(Range<double> range, int ticksCount)

		{

			if (Coeffs.Length == 0)

				return new TicksInfo<double>();



			var minorTicks = ranges.Select(r => CreateTicks(r)).SelectMany(m => m);

			var res = new TicksInfo<double>();

			res.TickSizes = minorTicks.Select(m => m.Value).ToArray();

			res.Ticks = minorTicks.Select(m => m.Tick).ToArray();



			return res;

		}



		public MinorTickInfo<double>[] CreateTicks(Range<double> range)

		{

			double step = (range.Max - range.Min) / (Coeffs.Length + 1);



			MinorTickInfo<double>[] res = new MinorTickInfo<double>[Coeffs.Length];

			for (int i = 0; i < Coeffs.Length; i++)

			{

				res[i] = new MinorTickInfo<double>(Coeffs[i], range.Min + step * (i + 1));

			}

			return res;

		}



		public int DecreaseTickCount(int ticksCount)

		{

			return ticksCount;

		}



		public int IncreaseTickCount(int ticksCount)

		{

			return ticksCount;

		}



		public ITicksProvider<double> MinorProvider

		{

			get { return null; }

		}



		public ITicksProvider<double> MajorProvider

		{

			get { return parent; }

		}



		#endregion

	}

}