// 
// NamespaceDeclaration.cs
//  
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2009 Novell, Inc (http://www.novell.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.Collections.Generic;
using System;

namespace ICSharpCode.Decompiler.CSharp.Syntax
{
	/// <summary>
	/// namespace Name { Members }
	/// </summary>
	public class NamespaceDeclaration : AstNode
	{
		public static readonly Role<AstNode> MemberRole = SyntaxTree.MemberRole;
		public static readonly Role<AstType> NamespaceNameRole = new Role<AstType>("NamespaceName", AstType.Null);

		public override NodeType NodeType {
			get {
				return NodeType.Unknown;
			}
		}

		public CSharpTokenNode NamespaceToken {
			get { return GetChildByRole(Roles.NamespaceKeyword); }
		}

		public AstType NamespaceName {
			get { return GetChildByRole(NamespaceNameRole) ?? AstType.Null; }
			set { SetChildByRole(NamespaceNameRole, value); }
		}

		public string Name {
			get {
				return UsingDeclaration.ConstructNamespace(NamespaceName);
			}
			set {
				var arr = value.Split('.');
				NamespaceName = ConstructType(arr, arr.Length - 1);
			}
		}

		static AstType ConstructType(string[] arr, int i)
		{
			if (i < 0 || i >= arr.Length)
				throw new ArgumentOutOfRangeException(nameof(i));
			if (i == 0)
				return new SimpleType(arr[i]);
			return new MemberType(ConstructType(arr, i - 1), arr[i]);
		}

		/// <summary>
		/// Gets the full namespace name (including any parent namespaces)
		/// </summary>
		public string FullName {
			get {
				NamespaceDeclaration parentNamespace = Parent as NamespaceDeclaration;
				if (parentNamespace != null)
					return BuildQualifiedName(parentNamespace.FullName, Name);
				return Name;
			}
		}

		public IEnumerable<string> Identifiers {
			get {
				var result = new Stack<string>();
				AstType type = NamespaceName;
				while (type is MemberType) {
					var mt = (MemberType)type;
					result.Push(mt.MemberName);
					type = mt.Target;
				}
				if (type is SimpleType)
					result.Push(((SimpleType)type).Identifier);
				return result;
			}
		}

		public CSharpTokenNode LBraceToken {
			get { return GetChildByRole(Roles.LBrace); }
		}

		public AstNodeCollection<AstNode> Members {
			get { return GetChildrenByRole(MemberRole); }
		}

		public CSharpTokenNode RBraceToken {
			get { return GetChildByRole(Roles.RBrace); }
		}

		public NamespaceDeclaration()
		{
		}

		public NamespaceDeclaration(string name)
		{
			this.Name = name;
		}

		public static string BuildQualifiedName(string name1, string name2)
		{
			if (string.IsNullOrEmpty(name1))
				return name2;
			if (string.IsNullOrEmpty(name2))
				return name1;
			return name1 + "." + name2;
		}

		public void AddMember(AstNode child)
		{
			AddChild(child, MemberRole);
		}

		public override void AcceptVisitor(IAstVisitor visitor)
		{
			visitor.VisitNamespaceDeclaration(this);
		}

		public override T AcceptVisitor<T>(IAstVisitor<T> visitor)
		{
			return visitor.VisitNamespaceDeclaration(this);
		}

		public override S AcceptVisitor<T, S>(IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitNamespaceDeclaration(this, data);
		}

		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			NamespaceDeclaration o = other as NamespaceDeclaration;
			return o != null && MatchString(this.Name, o.Name) && this.Members.DoMatch(o.Members, match);
		}
	}
}			;
