// 
// ComposedType.cs
//
// Author:
//       Mike Krüger <mkrueger@novell.com>
// 
// Copyright (c) 2010 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;
using System.Linq;
using System.Text;
using ICSharpCode.Decompiler.CSharp.OutputVisitor;
using ICSharpCode.Decompiler.CSharp.Resolver;
using ICSharpCode.Decompiler.TypeSystem;

namespace ICSharpCode.Decompiler.CSharp.Syntax
{
	public class ComposedType : AstType
	{
		public static readonly Role<AttributeSection> AttributeRole = EntityDeclaration.AttributeRole;
		public static readonly TokenRole RefRole = new TokenRole("ref");
		public static readonly TokenRole ReadonlyRole = new TokenRole("readonly");
		public static readonly TokenRole NullableRole = new TokenRole("?");
		public static readonly TokenRole PointerRole = new TokenRole("*");
		public static readonly Role<ArraySpecifier> ArraySpecifierRole = new Role<ArraySpecifier>("ArraySpecifier");
		public AstNodeCollection<AttributeSection> Attributes {
			get { return base.GetChildrenByRole(AttributeRole); }
		}

		/// <summary>
		/// Gets/sets whether this type has a 'ref' specifier.
		/// This is used for C# 7 ref locals/ref return.
		/// Parameters use ParameterDeclaration.ParameterModifier instead.
		/// </summary>
		public bool HasRefSpecifier {
			get {
				return !GetChildByRole(RefRole).IsNull;
			}
			set {
				SetChildByRole(RefRole, value ? new CSharpTokenNode(TextLocation.Empty, null) : null);
			}
		}

		/// <summary>
		/// Gets/sets whether this type has a 'readonly' specifier.
		/// This is used for C# 7.2 'ref readonly' locals/ref return.
		/// Parameters use ParameterDeclaration.ParameterModifier instead.
		/// </summary>
		public bool HasReadOnlySpecifier {
			get {
				return !GetChildByRole(ReadonlyRole).IsNull;
			}
			set {
				SetChildByRole(ReadonlyRole, value ? new CSharpTokenNode(TextLocation.Empty, null) : null);
			}
		}

		public AstType BaseType {
			get { return GetChildByRole(Roles.Type); }
			set { SetChildByRole(Roles.Type, value); }
		}
		
		public bool HasNullableSpecifier {
			get {
				return !GetChildByRole(NullableRole).IsNull;
			}
			set {
				SetChildByRole(NullableRole, value ? new CSharpTokenNode(TextLocation.Empty, null) : null);
			}
		}

		public bool HasOnlyNullableSpecifier {
			get {
				return HasNullableSpecifier && !HasRefSpecifier && !HasReadOnlySpecifier && PointerRank == 0 && ArraySpecifiers.Count == 0;
			}
		}

		public CSharpTokenNode NullableSpecifierToken {
			get {
				return GetChildByRole(NullableRole);
			}
		}
		
		public int PointerRank {
			get {
				return GetChildrenByRole(PointerRole).Count;
			}
			set {
				if (value < 0)
					throw new ArgumentOutOfRangeException();
				int d = this.PointerRank;
				while (d > value) {
					GetChildByRole(PointerRole).Remove();
					d--;
				}
				while (d < value) {
					InsertChildBefore(GetChildByRole(PointerRole), new CSharpTokenNode(TextLocation.Empty, PointerRole), PointerRole);
					d++;
				}
			}
		}
		
		public AstNodeCollection<ArraySpecifier> ArraySpecifiers {
			get { return GetChildrenByRole (ArraySpecifierRole); }
		}

		public AstNodeCollection<CSharpTokenNode> PointerTokens {
			get { return GetChildrenByRole (PointerRole); }
		}
		
		public override void AcceptVisitor (IAstVisitor visitor)
		{
			visitor.VisitComposedType (this);
		}
		
		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
		{
			return visitor.VisitComposedType (this);
		}
		
		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitComposedType (this, data);
		}
		
		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			ComposedType o = other as ComposedType;
			return o != null
				&& this.HasNullableSpecifier == o.HasNullableSpecifier
				&& this.PointerRank == o.PointerRank
				&& this.HasRefSpecifier == o.HasRefSpecifier
				&& this.HasReadOnlySpecifier == o.HasReadOnlySpecifier
				&& this.BaseType.DoMatch(o.BaseType, match)
				&& this.ArraySpecifiers.DoMatch(o.ArraySpecifiers, match);
		}

		public override string ToString(CSharpFormattingOptions formattingOptions)
		{
			StringBuilder b = new StringBuilder();
			if (this.HasRefSpecifier)
				b.Append("ref ");
			if (this.HasReadOnlySpecifier)
				b.Append("readonly ");
			b.Append(this.BaseType.ToString());
			if (this.HasNullableSpecifier)
				b.Append('?');
			b.Append('*', this.PointerRank);
			foreach (var arraySpecifier in this.ArraySpecifiers) {
				b.Append('[');
				b.Append(',', arraySpecifier.Dimensions - 1);
				b.Append(']');
			}
			return b.ToString();
		}
		
		public override AstType MakePointerType()
		{
			if (ArraySpecifiers.Any()) {
				return base.MakePointerType();
			} else {
				this.PointerRank++;
				return this;
			}
		}
		
		public override AstType MakeArrayType(int dimensions)
		{
			InsertChildBefore(this.ArraySpecifiers.FirstOrDefault(), new ArraySpecifier(dimensions), ArraySpecifierRole);
			return this;
		}

		public override AstType MakeRefType()
		{
			this.HasRefSpecifier = true;
			return this;
		}

		public override ITypeReference ToTypeReference(NameLookupMode lookupMode, InterningProvider interningProvider = null)
		{
			if (interningProvider == null)
				interningProvider = InterningProvider.Dummy;
			ITypeReference t = this.BaseType.ToTypeReference(lookupMode, interningProvider);
			if (this.HasNullableSpecifier) {
				t = interningProvider.Intern(NullableType.Create(t));
			}
			int pointerRank = this.PointerRank;
			for (int i = 0; i < pointerRank; i++) {
				t = interningProvider.Intern(new PointerTypeReference(t));
			}
			foreach (var a in this.ArraySpecifiers.Reverse()) {
				t = interningProvider.Intern(new ArrayTypeReference(t, a.Dimensions));
			}
			if (this.HasRefSpecifier) {
				t = interningProvider.Intern(new ByReferenceTypeReference(t));
			}
			return t;
		}
	}
	
	/// <summary>
	/// [,,,]
	/// </summary>
	public class ArraySpecifier : AstNode
	{
		public override NodeType NodeType {
			get {
				return NodeType.Unknown;
			}
		}
		
		public ArraySpecifier()
		{
		}
		
		public ArraySpecifier(int dimensions)
		{
			this.Dimensions = dimensions;
		}
		
		public CSharpTokenNode LBracketToken {
			get { return GetChildByRole (Roles.LBracket); }
		}
		
		public int Dimensions {
			get { return 1 + GetChildrenByRole(Roles.Comma).Count; }
			set {
				int d = this.Dimensions;
				while (d > value) {
					GetChildByRole(Roles.Comma).Remove();
					d--;
				}
				while (d < value) {
					InsertChildBefore(GetChildByRole(Roles.Comma), new CSharpTokenNode(TextLocation.Empty, Roles.Comma), Roles.Comma);
					d++;
				}
			}
		}
		
		public CSharpTokenNode RBracketToken {
			get { return GetChildByRole (Roles.RBracket); }
		}
		
		public override void AcceptVisitor (IAstVisitor visitor)
		{
			visitor.VisitArraySpecifier (this);
		}
		
		public override T AcceptVisitor<T> (IAstVisitor<T> visitor)
		{
			return visitor.VisitArraySpecifier (this);
		}
		
		public override S AcceptVisitor<T, S> (IAstVisitor<T, S> visitor, T data)
		{
			return visitor.VisitArraySpecifier(this, data);
		}
		
		protected internal override bool DoMatch(AstNode other, PatternMatching.Match match)
		{
			ArraySpecifier o = other as ArraySpecifier;
			return o != null && this.Dimensions == o.Dimensions;
		}

		public override string ToString(CSharpFormattingOptions formattingOptions)
		{
			return "[" + new string(',', this.Dimensions - 1) + "]";
		}
	}
}

