// Copyright © Microsoft Corporation.
// This source file is subject to the Microsoft Permissive License.
// See http://www.microsoft.com/resources/sharedsource/licensingbasics/sharedsourcelicenses.mspx.
// All other rights reserved.

using System;
using System.Collections.Generic;
using System.Xml.XPath;

namespace Microsoft.Ddue.Tools {

	public abstract class SyntaxGeneratorTemplate : SyntaxGenerator {

        protected SyntaxGeneratorTemplate (XPathNavigator configuration) : base(configuration) {

            string nameValue = configuration.GetAttribute("name", String.Empty);
            language = nameValue;

        }

        // A maximum width setting

        protected static int maxPosition = 60;

		// The language itentifier


        private string language;

        public string Language {
            get {
                return (language);
            }
            protected set {
                language = value;
            }
        }

		// Where data is stored

		// api data
		protected static XPathExpression apiNameExpression = XPathExpression.Compile("string(apidata/@name)");
		protected static XPathExpression apiGroupExpression = XPathExpression.Compile("string(apidata/@group)");
		protected static XPathExpression apiSubgroupExpression = XPathExpression.Compile("string(apidata/@subgroup)");
        protected static XPathExpression apiSubsubgroupExpression = XPathExpression.Compile("string(apidata/@subsubgroup)");

		// support testing
		protected static XPathExpression apiIsUnsafeExpression = XPathExpression.Compile("boolean(parameters/parameter//pointerTo or returns//pointerTo)");
		protected static XPathExpression apiIsGenericExpression = XPathExpression.Compile("boolean(templates/template)");
        protected static XPathExpression apiIsExtensionMethod = XPathExpression.Compile("boolean(attributes/attribute/type[@api='T:System.Runtime.CompilerServices.ExtensionAttribute'])");

		// visibility attribute
		protected static XPathExpression apiVisibilityExpression = XPathExpression.Compile("string((typedata|memberdata)/@visibility)");
        protected static XPathExpression apiIsFamilyMemberExpression = XPathExpression.Compile("boolean(contains(memberdata/@visibility,'family'))");

		// type data
		protected static XPathExpression apiVisibilityOfTypeExpression = XPathExpression.Compile("string(typedata/@visibility)");
		protected static XPathExpression apiIsAbstractTypeExpression = XPathExpression.Compile("boolean(typedata[@abstract='true'])");
		protected static XPathExpression apiIsSealedTypeExpression = XPathExpression.Compile("boolean(typedata[@sealed='true'])");
		protected static XPathExpression apiIsSerializableTypeExpression = XPathExpression.Compile("boolean(typedata[@serializable='true'])");

		// class data
		protected static XPathExpression apiBaseClassExpression = XPathExpression.Compile("family/ancestors/*[1]");
        protected static XPathExpression apiAncestorsExpression = XPathExpression.Compile("family/ancestors/*");

		// enumeration data

		// various subheadings 
		protected static XPathExpression apiAttributesExpression = XPathExpression.Compile("attributes/attribute");
		protected static XPathExpression apiTemplatesExpression = XPathExpression.Compile("templates/template");
		protected static XPathExpression apiImplementedInterfacesExpression = XPathExpression.Compile("implements/type");
		protected static XPathExpression apiParametersExpression = XPathExpression.Compile("parameters/parameter");
		protected static XPathExpression apiReturnTypeExpression = XPathExpression.Compile("returns/*[1]");

		// member data
		protected static XPathExpression apiVisibilityOfMemberExpression = XPathExpression.Compile("string(memberdata/@visibility)");
		protected static XPathExpression apiIsStaticExpression = XPathExpression.Compile("boolean(memberdata[@static='true'])");
		protected static XPathExpression apiIsSpecialExpression = XPathExpression.Compile("boolean(memberdata[@special='true'])");
        protected static XPathExpression apiIsDefaultMemberExpression = XPathExpression.Compile("boolean(memberdata[@default='true'])");

		// field data
		protected static XPathExpression apiIsLiteralFieldExpression = XPathExpression.Compile("boolean(fielddata[@literal='true'])");
		protected static XPathExpression apiIsInitOnlyFieldExpression = XPathExpression.Compile("boolean(fielddata[@initonly='true'])");
		protected static XPathExpression apiIsVolatileFieldExpression = XPathExpression.Compile("boolean(fielddata[@volatile='true'])");
		protected static XPathExpression apiIsSerializedFieldExpression = XPathExpression.Compile("boolean(fielddata[@serialized='true'])");

		// procedure data
		protected static XPathExpression apiIsAbstractProcedureExpression = XPathExpression.Compile("boolean(proceduredata[@abstract='true'])");
		protected static XPathExpression apiIsVirtualExpression = XPathExpression.Compile("boolean(proceduredata[@virtual='true'])");
		protected static XPathExpression apiIsFinalExpression = XPathExpression.Compile("boolean(proceduredata[@final='true'])");
		protected static XPathExpression apiOverridesMemberExpression = XPathExpression.Compile("string(proceduredata/@overrides/member)");
		protected static XPathExpression apiIsExplicitImplementationExpression = XPathExpression.Compile("boolean(memberdata/@visibility='private' and proceduredata/@virtual='true' and boolean(implements/member))");
		protected static XPathExpression apiImplementedMembersExpression = XPathExpression.Compile("implements/member");
		protected static XPathExpression apiIsOverrideExpression = XPathExpression.Compile("boolean(overrides/member)");

		// property data
		protected static XPathExpression apiIsReadPropertyExpression = XPathExpression.Compile("boolean(propertydata/@get='true')");
		protected static XPathExpression apiIsWritePropertyExpression = XPathExpression.Compile("boolean(propertydata/@set='true')");
        protected static XPathExpression apiGetVisibilityExpression = XPathExpression.Compile("string(propertydata/@get-visibility)");
        protected static XPathExpression apiSetVisibilityExpression = XPathExpression.Compile("string(propertydata/@set-visibility)");

		// event data
		protected static XPathExpression apiHandlerOfEventExpression = XPathExpression.Compile("eventhandler/*[1]");
        protected static XPathExpression apiEventArgsExpression = XPathExpression.Compile("eventargs/*[1]");

		// parameter data
		//protected static XPathExpression params_expression = XPathExpression.Compile("boolean(@params='true')");
		protected static XPathExpression parameterNameExpression = XPathExpression.Compile("string(@name)");
		protected static XPathExpression parameterTypeExpression = XPathExpression.Compile("*[1]");
		protected static XPathExpression parameterIsInExpression = XPathExpression.Compile("boolean(@in='true')");
		protected static XPathExpression parameterIsOutExpression = XPathExpression.Compile("boolean(@out='true')");
		protected static XPathExpression parameterIsRefExpression = XPathExpression.Compile("boolean(referenceTo)");
		protected static XPathExpression parameterIsParamArrayExpression = XPathExpression.Compile("boolean(@params='true')");

		// container data
        protected static XPathExpression apiContainingTypeExpression = XPathExpression.Compile("containers/type");
		protected static XPathExpression apiContainingTypeNameExpression = XPathExpression.Compile("string(containers/type/apidata/@name)");
		protected static XPathExpression apiContainingTypeSubgroupExpression = XPathExpression.Compile("string(containers/type/apidata/@subgroup)");
        protected static XPathExpression apiContainingAssemblyExpression = XPathExpression.Compile("string(containers/library/@assembly)");
        protected static XPathExpression apiContainingNamespaceIdExpression = XPathExpression.Compile("string(containers/namespace/@api)");
        protected static XPathExpression apiContainingNamespaceNameExpression = XPathExpression.Compile("string(containers/namespace/apidata/@name)");
        // protected static XPathExpression containing_type_templates_expression = XPathExpression.Compile("containers/container[@type]/templates");

		// referenced type data
		protected static XPathExpression typeExpression = XPathExpression.Compile("*[1]");
		protected static XPathExpression typeIdExpression = XPathExpression.Compile("@api");
		protected static XPathExpression typeModifiersExpression = XPathExpression.Compile("optionalModifier|requiredModifier|specialization");
		protected static XPathExpression typeOuterTypeExpression = XPathExpression.Compile("type");
		protected static XPathExpression typeIsObjectExpression = XPathExpression.Compile("boolean(local-name()='type' and @api='T:System.Object')");
		protected static XPathExpression valueExpression = XPathExpression.Compile("*[2]");
		protected static XPathExpression nameExpression = XPathExpression.Compile("string(@name)");
		protected static XPathExpression specializationArgumentsExpression = XPathExpression.Compile("*");

		// referenced member data
		protected static XPathExpression memberDeclaringTypeExpression = XPathExpression.Compile("*[1]");

		// attribute data
		protected static XPathExpression attributeTypeExpression = XPathExpression.Compile("*[1]");
		protected static XPathExpression attributeArgumentsExpression = XPathExpression.Compile("argument");
		protected static XPathExpression attributeAssignmentsExpression = XPathExpression.Compile("assignment");
		protected static XPathExpression assignmentNameExpression = XPathExpression.Compile("string(@name)");

		// template data
		protected static XPathExpression templateNameExpression = XPathExpression.Compile("string(@name)");
		protected static XPathExpression templateIsConstrainedExpression = XPathExpression.Compile("boolean(constrained)");
		protected static XPathExpression templateIsValueTypeExpression = XPathExpression.Compile("boolean(constrained/@value='true')");
		protected static XPathExpression templateIsReferenceTypeExpression = XPathExpression.Compile("boolean(constrained/@ref='true')");
		protected static XPathExpression templateIsConstructableExpression = XPathExpression.Compile("boolean(constrained/@ctor='true')");
		protected static XPathExpression templateConstraintsExpression = XPathExpression.Compile("constrained/type | constrained/implements/type | constrained/implements/template");
        protected static XPathExpression templateIsCovariantExpression = XPathExpression.Compile("boolean(variance/@covariant='true')");
        protected static XPathExpression templateIsContravariantExpression = XPathExpression.Compile("boolean(variance/@contravariant='true')");

        protected static XPathExpression attachedEventAdderExpression = XPathExpression.Compile("string(attachedeventdata/adder/member/@api)");
        protected static XPathExpression attachedEventRemoverExpression = XPathExpression.Compile("string(attachedeventdata/remover/member/@api)");

        protected static XPathExpression attachedPropertyGetterExpression = XPathExpression.Compile("string(attachedpropertydata/getter/member/@api)");
        protected static XPathExpression attachedPropertySetterExpression = XPathExpression.Compile("string(attachedpropertydata/setter/member/@api)");
        
        // Methods to write syntax for different kinds of APIs

		public override void WriteSyntax (XPathNavigator reflection, SyntaxWriter writer) {

			writer.WriteStartBlock(Language);

			string group = (string) reflection.Evaluate(apiGroupExpression);

			switch (group) {
				case "namespace":
					WriteNamespaceSyntax(reflection, writer);
				break;
				case "type":
					WriteTypeSyntax(reflection, writer);
				break;
				case "member":
					WriteMemberSyntax(reflection, writer);
				break;
			}		
			
			writer.WriteEndBlock();

		}

		public virtual void WriteTypeSyntax (XPathNavigator reflection, SyntaxWriter writer) {

			string subgroup = (string) reflection.Evaluate(apiSubgroupExpression);

			switch (subgroup) {
				case "class":
					WriteClassSyntax(reflection, writer);
				break;
				case "structure":
					WriteStructureSyntax(reflection, writer);
				break;
				case "interface":
					WriteInterfaceSyntax(reflection, writer);
				break;
				case "delegate":
					WriteDelegateSyntax(reflection, writer);
				break;
				case "enumeration":
					WriteEnumerationSyntax(reflection, writer);
				break;
			}		

		}

		public virtual void WriteMemberSyntax (XPathNavigator reflection, SyntaxWriter writer) {

			string subgroup = (string) reflection.Evaluate(apiSubgroupExpression);
            string subsubgroup = (string)reflection.Evaluate(apiSubsubgroupExpression);

			switch (subgroup) {
				case "constructor":
					WriteConstructorSyntax(reflection, writer);
				break;
				case "method":
					WriteMethodSyntax(reflection, writer);
				break;
				case "property":
                    if (subsubgroup == "attachedProperty")
                        WriteAttachedPropertySyntax(reflection, writer);
                    else
                        WritePropertySyntax(reflection, writer);
                    break;
				case "event":
                    if (subsubgroup == "attachedEvent")
                        WriteAttachedEventSyntax(reflection, writer);
                    else
                        WriteEventSyntax(reflection, writer);
                    break;
				case "field":
					WriteFieldSyntax(reflection, writer);
				break;
			}		

		}

		public abstract void WriteNamespaceSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteClassSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteStructureSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteInterfaceSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteDelegateSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteEnumerationSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteConstructorSyntax (XPathNavigator reflection, SyntaxWriter writer);

        public virtual void WriteMethodSyntax (XPathNavigator reflection, SyntaxWriter writer) {
            bool isSpecialName = (bool)reflection.Evaluate(apiIsSpecialExpression);
            string name = (string)reflection.Evaluate(apiNameExpression);

            if (isSpecialName) {
                string subsubgroup = (string)reflection.Evaluate(apiSubsubgroupExpression);
                if (subsubgroup == "operator") {
                    if ((name == "Implicit") || (name == "Explicit")) {
                        WriteCastSyntax(reflection, writer);
                    } else {
                        WriteOperatorSyntax(reflection, writer);
                    }
                }
            } else {
                WriteNormalMethodSyntax(reflection, writer);
            }
        }

		public abstract void WritePropertySyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteFieldSyntax (XPathNavigator reflection, SyntaxWriter writer);

		public abstract void WriteEventSyntax (XPathNavigator reflection, SyntaxWriter writer);

        public virtual void WriteNormalMethodSyntax (XPathNavigator reflection, SyntaxWriter writer) { }

        public virtual void WriteOperatorSyntax (XPathNavigator reflection, SyntaxWriter writer) { }

        public virtual void WriteCastSyntax (XPathNavigator reflection, SyntaxWriter writer) { }

        public virtual void WriteAttachedPropertySyntax(XPathNavigator reflection, SyntaxWriter writer)
        {
            string getterId = (string)reflection.Evaluate(attachedPropertyGetterExpression);
            string setterId = (string)reflection.Evaluate(attachedPropertySetterExpression);
            if (!string.IsNullOrEmpty(getterId))
            {
                writer.WriteString("See ");
                writer.WriteReferenceLink(getterId);
            }
            if (!string.IsNullOrEmpty(setterId))
            {
                if (!string.IsNullOrEmpty(getterId))
                    writer.WriteString(", ");
                writer.WriteReferenceLink(setterId);
            }
        }

        public virtual void WriteAttachedEventSyntax(XPathNavigator reflection, SyntaxWriter writer)
        {
            string adderId = (string)reflection.Evaluate(attachedEventAdderExpression);
            string removerId = (string)reflection.Evaluate(attachedEventRemoverExpression);
            if (!(string.IsNullOrEmpty(adderId) && string.IsNullOrEmpty(removerId)))
            {
                writer.WriteString("See ");
                writer.WriteReferenceLink(adderId);
                writer.WriteString(", ");
                writer.WriteReferenceLink(removerId);
            }
        }

        protected virtual bool IsUnsupportedUnsafe(XPathNavigator reflection, SyntaxWriter writer)
        {
			bool isUnsafe = (bool) reflection.Evaluate(apiIsUnsafeExpression);

			if (isUnsafe) {
				writer.WriteMessage("UnsupportedUnsafe_" + Language);
			}

			return(isUnsafe);
		}

		protected virtual bool IsUnsupportedGeneric (XPathNavigator reflection, SyntaxWriter writer) {

			bool isGeneric = (bool) reflection.Evaluate(apiIsGenericExpression);

			if (isGeneric) {
				writer.WriteMessage("UnsupportedGeneric_" + Language);
			}

			return(isGeneric);

		}

		protected virtual bool IsUnsupportedExplicit (XPathNavigator reflection, SyntaxWriter writer) {

			bool isExplicit = (bool) reflection.Evaluate(apiIsExplicitImplementationExpression);

			if (isExplicit) {
				writer.WriteMessage("UnsupportedExplicit_" + Language);
			}

			return(isExplicit);

		}

	}

	public abstract class DeclarationSyntaxGeneratorTemplate : SyntaxGeneratorTemplate {

        protected DeclarationSyntaxGeneratorTemplate (XPathNavigator configuration) : base(configuration) { }

		// Methods to implement

		protected abstract void WriteVisibility (XPathNavigator reflection, SyntaxWriter writer);

		// Utility methods

		protected static string[] SeperateTypes (string typelist) {
			List<string> types = new List<string>();

			int start = 0;
			int specializationCount = 0;
			for (int index=0; index<typelist.Length; index++) {
				switch (typelist[index]) {
					case '{':
						specializationCount++;
					break;
					case '}':
						specializationCount--;
					break;
					case ',':
						if (specializationCount == 0) {
							types.Add( "T:" + typelist.Substring(start, index-start) );
							start = index + 1;
						}
					break;
				}
			}
			types.Add( "T:" + typelist.Substring(start) );
			return(types.ToArray());
		}

		protected static string GetTemplateParameterName (string reference, XPathNavigator reflection) {

			string group = (string) reflection.Evaluate(apiGroupExpression);

			XPathNavigator template = null;
			if (reference.StartsWith("T:`")) {
				if (reference[3]=='`') {

					// a method template parameter

					int position = Convert.ToInt32( reference.Substring(4) ) + 1;

					if (group == "member") {
						// we are in a method, so presumably it is one of that method's template parameters
						template = reflection.SelectSingleNode( String.Format("templates/template[{0}]", position) );
					}

				} else {

					// a type template parameter

					int position = Convert.ToInt32( reference.Substring(3) ) + 1;

					if (group == "type") {
						// we are in a type, so look there for the parameter
						template = reflection.SelectSingleNode( String.Format("templates/template[{0}]", position) );
					}

					if (template == null) {
						// either we weren't in a type, or it didn't have the template
						// so now look at the templates of the containing type
						template = reflection.SelectSingleNode( String.Format("containers/container[@type]/templates/template[{0}]", position) );
					}

					
					
				}
			}

			if (template != null) {
				return(template.GetAttribute("name", String.Empty));
			} else {
				Console.WriteLine("UNRESOLVED TEMPLATE PARAMETER NAME");
				return("T");
			}

		}


	}

}