// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

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

namespace ICSharpCode.SharpDevelop.Dom
{
	public interface IProjectContent 
	{
		void Dispose();
		
		XmlDoc XmlDoc {
			get;
		}
		
		/// <summary>
		/// Gets if the project content is representing the current version of the assembly.
		/// This property always returns true for ParseProjectContents but might return false
		/// for ReflectionProjectContent/CecilProjectContent if the file was changed.
		/// </summary>
		bool IsUpToDate {
			get;
		}
		
		ICollection<IClass> Classes {
			get;
		}
		
		/// <summary>
		/// Gets the list of namespaces defined in this project content. Does not include namespaces from
		/// referenced project contents.
		/// </summary>
		ICollection<string> NamespaceNames {
			get;
		}
		
		/// <summary>
		/// Gets the list of referenced project contents.
		/// </summary>
		ICollection<IProjectContent> ReferencedContents {
			get;
		}
		
		event EventHandler ReferencedContentsChanged;
		
		/// <summary>
		/// Gets the properties of the language this project content was written in.
		/// </summary>
		LanguageProperties Language {
			get;
		}
		
		/// <summary>
		/// Gets the default imports of the project content. Can return null.
		/// </summary>
		IUsing DefaultImports {
			get;
		}
		
		/// <summary>
		/// Gets the project for this project content. Returns null for reflection project contents.
		/// The type used for project objects depends on the host application.
		/// </summary>
		object Project {
			get;
		}
		
		/// <summary>
		/// Gets a class that allows to conveniently access commonly used types in the system
		/// namespace.
		/// </summary>
		SystemTypes SystemTypes {
			get;
		}
		
		IList<IAttribute> GetAssemblyAttributes();
		
		string GetXmlDocumentation(string memberTag);
		
		void AddClassToNamespaceList(IClass addClass);
		void RemoveCompilationUnit(ICompilationUnit oldUnit);
		void UpdateCompilationUnit(ICompilationUnit oldUnit, ICompilationUnit parserOutput, string fileName);
		
		IClass GetClass(string typeName, int typeParameterCount);
		bool NamespaceExists(string name);
		List<ICompletionEntry> GetNamespaceContents(string nameSpace);
		List<ICompletionEntry> GetAllContents();
		
		IClass GetClass(string typeName, int typeParameterCount, LanguageProperties language, GetClassOptions options);
		bool NamespaceExists(string name, LanguageProperties language, bool lookInReferences);
		/// <summary>
		/// Adds the contents of the specified <paramref name="subNameSpace"/> to the <paramref name="list"/>.
		/// </summary>
		/// <param name="lookInReferences">If true, contents of referenced projects will be added as well (not recursive - just 1 level deep).</param>
		void AddNamespaceContents(List<ICompletionEntry> list, string subNameSpace, LanguageProperties language, bool lookInReferences);
		/// <summary>
		/// Adds the contents of all namespaces in this project to the <paramref name="list"/>.
		/// </summary>
		/// <param name="lookInReferences">If true, contents of referenced projects will be added as well (not recursive - just 1 level deep).</param>
		void AddAllContents(List<ICompletionEntry> list, LanguageProperties language, bool lookInReferences);
		
		SearchTypeResult SearchType(SearchTypeRequest request);
		
		/// <summary>
		/// Gets the position of a member in this project content (not a referenced one).
		/// </summary>
		/// <param name="fullMemberName">The full class name in Reflection syntax (always case sensitive, ` for generics)</param>
		/// <param name="lookInReferences">Whether to search in referenced project contents.</param>
		IClass GetClassByReflectionName(string fullMemberName, bool lookInReferences);
		
		/// <summary>
		/// Gets the definition position of the class/member.
		/// </summary>
		/// <param name="entity">The entity to get the position from.</param>
		FilePosition GetPosition(IEntity entity);
		
		/// <summary>
		/// Gets whether internals in the project content are visible to the other project content.
		/// </summary>
		bool InternalsVisibleTo(IProjectContent otherProjectContent);
		
		/// <summary>
		/// Gets the name of the assembly.
		/// </summary>
		string AssemblyName {
			get;
		}
	}
	
	[Flags]
	public enum GetClassOptions
	{
		None = 0,
		/// <summary>
		/// Also look in referenced project contents.
		/// </summary>
		LookInReferences = 1,
		/// <summary>
		/// Try if the class is an inner class.
		/// </summary>
		LookForInnerClass = 2,
		/// <summary>
		/// Do not return a class with the wrong type parameter count.
		/// If this flag is not set, GetClass will return a class with the same name but a different
		/// type parameter count if no exact match is found.
		/// </summary>
		ExactMatch = 4,
		/// <summary>
		/// Default = LookInReferences + LookForInnerClass
		/// </summary>
		Default = LookInReferences | LookForInnerClass
	}
	
	public sealed class SearchTypeRequest
	{
		IUsingScope currentUsingScope;
		ICompilationUnit currentCompilationUnit;
		
		public string Name { get; set; }
		public int TypeParameterCount { get; set; }
		public IClass CurrentType { get; set; }
		public int CaretLine { get; set; }
		public int CaretColumn { get; set; }
		
		public ICompilationUnit CurrentCompilationUnit {
			get { return currentCompilationUnit; }
			set {
				if (value == null)
					throw new ArgumentNullException("CurrentCompilationUnit");
				currentCompilationUnit = value;
			}
		}
		
		public IUsingScope CurrentUsingScope {
			get { return currentUsingScope; }
			set {
				if (value == null)
					throw new ArgumentNullException("CurrentUsingScope");
				currentUsingScope = value;
			}
		}
		
		public SearchTypeRequest(string name, int typeParameterCount, IClass currentType, int caretLine, int caretColumn)
		{
			if (currentType == null)
				throw new ArgumentNullException("currentType");
			this.Name = name;
			this.TypeParameterCount = typeParameterCount;
			this.CurrentCompilationUnit = currentType.CompilationUnit;
			this.CurrentType = currentType != null ? currentType.GetCompoundClass() : null;
			this.CaretLine = caretLine;
			this.CaretColumn = caretColumn;
			this.CurrentUsingScope = currentType.UsingScope;
		}
		
		public SearchTypeRequest(string name, int typeParameterCount, IClass currentType, ICompilationUnit currentCompilationUnit, int caretLine, int caretColumn)
		{
			if (currentCompilationUnit == null)
				throw new ArgumentNullException("currentCompilationUnit");
			this.Name = name;
			this.TypeParameterCount = typeParameterCount;
			this.CurrentCompilationUnit = currentCompilationUnit;
			this.CurrentType = currentType != null ? currentType.GetCompoundClass() : null;
			this.CaretLine = caretLine;
			this.CaretColumn = caretColumn;
			this.CurrentUsingScope = (currentType != null) ? currentType.UsingScope : currentCompilationUnit.UsingScope;
		}
	}
	
	public struct SearchTypeResult
	{
		public static readonly SearchTypeResult Empty = default(SearchTypeResult);
		
		readonly IReturnType result;
		readonly IUsing usedUsing;
		readonly string namespaceResult;
		
		public SearchTypeResult(IReturnType result) : this(result, null) {}
		
		public SearchTypeResult(IClass c) : this(c != null ? c.DefaultReturnType : null) {}
		
		public SearchTypeResult(IReturnType result, IUsing usedUsing)
		{
			this.result = result;
			this.usedUsing = usedUsing;
			this.namespaceResult = null;
		}
		
		public SearchTypeResult(string namespaceResult, IUsing usedUsing)
		{
			this.result = null;
			this.usedUsing = usedUsing;
			this.namespaceResult = namespaceResult;
		}
		
		/// <summary>
		/// Gets the result type.
		/// </summary>
		public IReturnType Result {
			get { return result; }
		}
		
		/// <summary>
		/// Gets the using that was used for this type lookup.
		/// </summary>
		public IUsing UsedUsing {
			get { return usedUsing; }
		}
		
		public string NamespaceResult {
			get { return namespaceResult; }
		}
	}
	
	/// <summary>
	/// Used in 'GetNamespaceContents' result to represent a namespace.
	/// </summary>
	public class NamespaceEntry : ICompletionEntry
	{
		public string Name { get; private set; }
		
		public NamespaceEntry(string name)
		{
			if (name == null)
				throw new ArgumentNullException("name");
			this.Name = name;
		}
		
		public override int GetHashCode()
		{
			return Name.GetHashCode();
		}
		
		public override bool Equals(object obj)
		{
			NamespaceEntry e = obj as NamespaceEntry;
			return e != null && e.Name == this.Name;
		}
		
		public override string ToString()
		{
			return Name;
		}
	}
}