//
// TestLabel.cs
//
// Author:
//       Martin Baulig <martin.baulig@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.Text;
using System.Collections.Generic;

namespace MonoTests.System.ServiceModel.MetadataTests {

	public class TestLabel {

		List<Scope> scopes;
		string delimiter;
		Style defaultStyle;

		public enum Style {
			Letter,
			Number,
			HexNumer
		}

		public TestLabel (string prefix)
			: this (prefix, ".", Style.Letter)
		{
		}

		public TestLabel (string prefix, string delimiter, Style style)
		{
			if ((prefix == null) || (prefix.Equals (string.Empty)))
				throw new ArgumentException ("Cannot be null or empty.", "prefix");
			if (delimiter == null)
				throw new ArgumentNullException ("delimiter");

			scopes = new List<Scope> ();
			scopes.Add (new Scope (prefix, style));

			this.delimiter = delimiter;
			this.defaultStyle = style;
		}

		class Scope {
			public readonly string Text;
			public readonly Style Style;
			int id;

			public Scope (string text, Style style)
			{
				this.Text = text;
				this.Style = style;
				this.id = 0;
			}

			public int GetID ()
			{
				return ++id;
			}
		}

		public void EnterScope (string scope)
		{
			scopes.Add (new Scope (scope, defaultStyle));
		}

		public void LeaveScope ()
		{
			if (scopes.Count <= 1)
				throw new InvalidOperationException ();
			scopes.RemoveAt (scopes.Count - 1);
		}

		public string Get ()
		{
			var sb = new StringBuilder ();
			for (int i = 0; i < scopes.Count; i++) {
				sb.Append (scopes [i].Text);
				sb.Append (delimiter);
			}

			var scope = scopes [scopes.Count - 1];
			var id = scope.GetID ();

			switch (scope.Style) {
			case Style.Letter:
				if (id <= 26)
					sb.Append ((char)('a' + id - 1));
				else
					goto case Style.Number;
				break;

			case Style.Number:
				sb.Append (id);
				break;

			case Style.HexNumer:
				sb.AppendFormat ("{0:x2}", id);
				break;
			}

			return sb.ToString ();
		}

		public override string ToString ()
		{
			var sb = new StringBuilder ();
			sb.Append ("[");
			for (int i = 0; i < scopes.Count; i++) {
				if (i > 0)
					sb.Append (delimiter);
				sb.Append (scopes [i].Text);
			}
			sb.Append ("]");
			return sb.ToString ();
		}
	}
}