using System;
using System.Collections.Generic;
using System.IO;
using System.Xml.Linq;
using NUnit.Framework;
using ProjectConverter.Platforms;

// This file is part of the ANX.Framework created by the
// "ANX.Framework developer group" and released under the Ms-PL license.
// For details see: http://anxframework.codeplex.com/license

namespace ProjectConverter
{
	public abstract class Converter
	{
		protected const string XnaGameStudioTarget =
			"Microsoft.Xna.GameStudio.targets";
		protected const string XnaPipelineExtensionTarget =
			"Microsoft.Xna.GameStudio.ContentPipelineExtensions.targets";

		protected ProjectPath currentProject
		{
			get;
			private set;
		}

		public abstract string Postfix
		{
			get;
		}

		#region ConvertAllProjects
		public void ConvertAllProjects(string solutionFilepath)
		{
			ProjectPath[] allProjects = CollectAllProjects(solutionFilepath);

			for (int index = 0; index < allProjects.Length; index++)
			{
				ConvertProject(allProjects[index]);
			}

			CreateTargetSolution(solutionFilepath, allProjects);
		}
		#endregion

		#region ConvertProject
		public void ConvertProject(ProjectPath project)
		{
			currentProject = project;

			string namespaceName = project.Root.Name.NamespaceName;
			XName importName = XName.Get("Import", namespaceName);
			XName rootNamespaceName = XName.Get("RootNamespace", namespaceName);
			XName propertyGroupName = XName.Get("PropertyGroup", namespaceName);
			XName itemGroupName = XName.Get("ItemGroup", namespaceName);

			XName definesName = XName.Get("DefineConstants", namespaceName);
			XName referenceName = XName.Get("Reference", namespaceName);
			XName projectReferenceName = XName.Get("ProjectReference", namespaceName);

			foreach (var group in project.Root.Elements())
			{
				if (group.Name == propertyGroupName)
				{
					XElement definesNode = group.Element(definesName);
					if (definesNode != null)
					{
						definesNode.Value =
							DefinesConverter.ConvertDefines(definesNode.Value, Postfix);
					}

					if (group.Element(rootNamespaceName) != null)
					{
						ConvertMainPropertyGroup(group);
					}
					else
					{
						ConvertPropertyGroup(group);
					}
				}
				else if (group.Name == importName)
				{
					XAttribute projectAttribute = group.Attribute("Project");
					ConvertImport(group, projectAttribute);
				}
				else if (group.Name == itemGroupName)
				{
					foreach (var reference in group.Elements(referenceName))
						ConvertReference(reference);

					foreach (var projectReference in group.Elements(projectReferenceName))
					{
						FixProjectReferencePath(projectReference);
						ConvertProjectReference(projectReference);
					}

					ConvertItemGroup(group);
				}
			}

			PostConvert();

			project.Save();
		}
		#endregion

		#region ConvertMainPropertyGroup
		protected virtual void ConvertMainPropertyGroup(XElement element)
		{
		}
		#endregion

		#region ConvertPropertyGroup
		protected virtual void ConvertPropertyGroup(XElement element)
		{
		}
		#endregion

		#region ConvertItemGroup
		protected virtual void ConvertItemGroup(XElement element)
		{
		}
		#endregion

		#region ConvertProjectReference
		protected virtual void ConvertProjectReference(XElement element)
		{
		}
		#endregion

		#region ConvertReference
		protected virtual void ConvertReference(XElement element)
		{
		}
		#endregion

		#region ConvertImport
		protected virtual void ConvertImport(XElement element, XAttribute projectAttribute)
		{
		}
		#endregion

		#region PostConvert
		protected virtual void PostConvert()
		{
		}
		#endregion

		#region DeleteNodeIfExists
		protected void DeleteNodeIfExists(XElement group, string nodeName)
		{
			XName name = XName.Get(nodeName, group.Name.NamespaceName);
			XElement element = group.Element(name);
			if (element != null)
			{
				element.Remove();
			}
		}
		#endregion

		#region GetOrCreateNode
		protected XElement GetOrCreateNode(XElement group, string nodeName)
		{
			XName name = XName.Get(nodeName, group.Name.NamespaceName);
			XElement element = group.Element(name);
			if (element == null)
			{
				element = new XElement(name);
				group.Add(element);
			}
			return element;
		}
		#endregion

		#region ChangeOrCreateNodeValue
		protected void ChangeOrCreateNodeValue(XElement group,
			string nodeName, string value)
		{
			GetOrCreateNode(group, nodeName).Value = value;
		}
		#endregion

		#region FixProjectReferencePath
		private void FixProjectReferencePath(XElement projectReference)
		{
			XAttribute includeAttribute = projectReference.Attribute("Include");
			if (includeAttribute != null)
			{
				string referencePath = includeAttribute.Value;
				if (referencePath.EndsWith(".csproj"))
				{
					referencePath = referencePath.Replace(".csproj", "_" + Postfix + ".csproj");
					string basePath = Path.GetDirectoryName(currentProject.FullSourcePath);
					string fullReferencePath = Path.Combine(basePath, referencePath);
					if (File.Exists(fullReferencePath))
					{
						includeAttribute.Value = referencePath;
					}
				}
			}
		}
		#endregion

		#region CollectAllProjects
		private ProjectPath[] CollectAllProjects(string solutionFilepath)
		{
			VSSolution solution = new VSSolution(solutionFilepath);
			List<ProjectPath> result = new List<ProjectPath>();

			string basePath = Path.GetDirectoryName(solutionFilepath);

			foreach (var project in solution.Projects)
			{
				if (project.IsCsProject)
				{
					result.Add(new ProjectPath(this, project.RelativePath, basePath));
				}
			}

			return result.ToArray();
		}
		#endregion

		#region CreateTargetSolution
		private void CreateTargetSolution(string solutionFilepath,
			ProjectPath[] allProjects)
		{
			string[] allLines = File.ReadAllLines(solutionFilepath);
			for (int index = 0; index < allLines.Length; index++)
			{
				foreach (var project in allProjects)
				{
					string replaceText = "\"" + project.RelativeSourcePath + "\"";
					if (allLines[index].Contains(replaceText))
					{
						allLines[index] = allLines[index].Replace(replaceText,
							"\"" + project.RelativeDestinationPath + "\"");
					}
				}
			}

			string targetSolutionPath =
				solutionFilepath.Substring(0, solutionFilepath.Length - ".sln".Length);
			targetSolutionPath += "_" + Postfix + ".sln";

			File.WriteAllLines(targetSolutionPath, allLines);
		}
		#endregion

		private class ConverterTests
		{
			#region TestCollectAllProjects
			[Test]
			public static void TestCollectAllProjects()
			{
				const string filepath = @"D:\code\csharp\ANX.Framework\ANX.Framework.sln";
				var converter = new MetroConverter();
				ProjectPath[] result = converter.CollectAllProjects(filepath);
				
				Assert.Greater(result.Length, 0);
			}
			#endregion

			#region TestConvertSolutionMetro
			[Test]
			public static void TestConvertSolutionMetro()
			{
				const string filepath = @"D:\code\csharp\ANX.Framework\ANX.Framework.sln";
				var converter = new MetroConverter();
				converter.ConvertAllProjects(filepath);
			}
			#endregion

			#region TestConvertSolutionPsVita
			[Test]
			public static void TestConvertSolutionPsVita()
			{
				const string filepath = @"D:\code\csharp\ANX.Framework\ANX.Framework.sln";
				var converter = new PsVitaConverter();
				converter.ConvertAllProjects(filepath);
			}
			#endregion

			#region TestConvertSolutionLinux
			[Test]
			public static void TestConvertSolutionLinux()
			{
				const string filepath = @"D:\code\csharp\ANX.Framework\ANX.Framework.sln";
				var converter = new LinuxConverter();
				converter.ConvertAllProjects(filepath);
			}
			#endregion
		}
	}
}