using System;
using System.Collections.Generic;
using System.Text;

namespace PDFPatcher.Model
{
	[System.Diagnostics.DebuggerDisplay("{Location}={Distance}")]
	sealed class DistanceInfo
	{
		[Flags]
		internal enum Placement
		{
			Unknown = 0,
			Overlapping = 1,
			Left = 2,
			Right = 4,
			Up = 8,
			Down = 16
		}

		internal Placement Location { get; private set; }
		internal float DistanceX { get; private set; }
		internal float DistanceY { get; private set; }
		internal bool IsOverlapping => (Location & Placement.Overlapping) != Placement.Unknown;
		internal bool IsLeft => (Location & Placement.Left) != Placement.Unknown;
		internal bool IsRight => (Location & Placement.Right) != Placement.Unknown;
		internal bool IsAbove => (Location & Placement.Up) != Placement.Unknown;
		internal bool IsBelow => (Location & Placement.Down) != Placement.Unknown;
		internal bool IsVerticallyAligned => (Location & (Placement.Up | Placement.Down)) != Placement.Unknown;
		internal bool IsHorizontallyAligned => (Location & (Placement.Left | Placement.Right)) != Placement.Unknown;

		internal float MinDistance => (Location & Placement.Left) != Placement.Unknown || (Location & Placement.Right) != Placement.Unknown
					? DistanceX
					: (Location & Placement.Down) != Placement.Unknown || (Location & Placement.Up) != Placement.Unknown
					? DistanceY : DistanceRadial;
		internal float DistanceRadial => DistanceX == Single.MaxValue || DistanceY == Single.MaxValue
					? Single.MaxValue
					: (float)Math.Sqrt(DistanceX * DistanceX + DistanceY * DistanceY);

		internal DistanceInfo(Placement location, float distanceX, float distanceY) {
			Location = location;
			DistanceX = distanceX;
			DistanceY = distanceY;
		}

	}
}