<#@ assembly name="System.Core"

#><#@ assembly name="System.Data.Linq"

#><#@ assembly name="EnvDTE"

#><#@ assembly name="System.Xml"

#><#@ assembly name="System.Xml.Linq"

#><#@ import namespace="System.Collections.Generic"

#><#@ import namespace="System.IO"

#><#@ import namespace="System.Text"

#><#@ import namespace="Microsoft.VisualStudio.TextTemplating"

#><#+

// https://raw.github.com/damieng/DamienGKit

// http://damieng.com/blog/2009/11/06/multiple-outputs-from-t4-made-easy-revisited

// Manager class records the various blocks so it can split them up

class Manager {

    private class Block {

        public String Name;

        public int Start, Length;

        public bool IncludeInDefault;

    }

    private Block currentBlock;

    private readonly List<Block> files = new List<Block>();

    private readonly Block footer = new Block();

    private readonly Block header = new Block();

    private readonly ITextTemplatingEngineHost host;

    private readonly StringBuilder template;

    protected readonly List<String> generatedFileNames = new List<String>();

    public static Manager Create(ITextTemplatingEngineHost host, StringBuilder template) {

        return (host is IServiceProvider) ? new VSManager(host, template) : new Manager(host, template);

    }

    public void StartNewFile(String name) {

        if (name == null)

            throw new ArgumentNullException("name");

        CurrentBlock = new Block { Name = name };

    }

    public void StartFooter(bool includeInDefault = true) {

        CurrentBlock = footer;

        footer.IncludeInDefault = includeInDefault;

    }

    public void StartHeader(bool includeInDefault = true) {

        CurrentBlock = header;

        header.IncludeInDefault = includeInDefault;

    }

    public void EndBlock() {

        if (CurrentBlock == null)

            return;

        CurrentBlock.Length = template.Length - CurrentBlock.Start;

        if (CurrentBlock != header && CurrentBlock != footer)

            files.Add(CurrentBlock);

        currentBlock = null;

    }

    public virtual void Process(bool split, bool sync = true) {

        if (split) {

            EndBlock();

            String headerText = template.ToString(header.Start, header.Length);

            String footerText = template.ToString(footer.Start, footer.Length);

            String outputPath = Path.GetDirectoryName(host.TemplateFile);

            files.Reverse();

            if (!footer.IncludeInDefault)

                template.Remove(footer.Start, footer.Length);

            foreach(Block block in files) {

                String fileName = Path.Combine(outputPath, block.Name);

                String content = headerText + template.ToString(block.Start, block.Length) + footerText;

                generatedFileNames.Add(fileName);

                CreateFile(fileName, content);

                template.Remove(block.Start, block.Length);

            }

            if (!header.IncludeInDefault)

                template.Remove(header.Start, header.Length);

        }

    }

    protected virtual void CreateFile(String fileName, String content) {

        if (IsFileContentDifferent(fileName, content))

            File.WriteAllText(fileName, content);

    }

    public virtual String GetCustomToolNamespace(String fileName) {

        return null;

    }

    public virtual String DefaultProjectNamespace {

        get { return null; }

    }

    protected bool IsFileContentDifferent(String fileName, String newContent) {

        return !(File.Exists(fileName) && File.ReadAllText(fileName) == newContent);

    }

    private Manager(ITextTemplatingEngineHost host, StringBuilder template) {

        this.host = host;

        this.template = template;

    }

    private Block CurrentBlock {

        get { return currentBlock; }

        set {

            if (CurrentBlock != null)

                EndBlock();

            if (value != null)

                value.Start = template.Length;

            currentBlock = value;

        }

    }

    private class VSManager: Manager {

        private readonly EnvDTE.ProjectItem templateProjectItem;

        private readonly EnvDTE.DTE dte;

        private readonly Action<String> checkOutAction;

        private readonly Action<List<String>> projectSyncAction;

        public override String DefaultProjectNamespace {

            get {

                return templateProjectItem.ContainingProject.Properties.Item("DefaultNamespace").Value.ToString();

            }

        }

        public override String GetCustomToolNamespace(string fileName) {

            return dte.Solution.FindProjectItem(fileName).Properties.Item("CustomToolNamespace").Value.ToString();

        }

        public override void Process(bool split, bool sync) {

            if (templateProjectItem.ProjectItems == null)

                return;

            base.Process(split, sync);

            if (sync)

                projectSyncAction.EndInvoke(projectSyncAction.BeginInvoke(generatedFileNames, null, null));

        }

        protected override void CreateFile(String fileName, String content) {

            if (IsFileContentDifferent(fileName, content)) {

                CheckoutFileIfRequired(fileName);

                File.WriteAllText(fileName, content);

            }

        }

        internal VSManager(ITextTemplatingEngineHost host, StringBuilder template)

            : base(host, template) {

            var hostServiceProvider = (IServiceProvider)host;

            if (hostServiceProvider == null)

                throw new ArgumentNullException("Could not obtain IServiceProvider");

            dte = (EnvDTE.DTE) hostServiceProvider.GetService(typeof(EnvDTE.DTE));

            if (dte == null)

                throw new ArgumentNullException("Could not obtain DTE from host");

            templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile);

            checkOutAction = fileName => dte.SourceControl.CheckOutItem(fileName);

            projectSyncAction = keepFileNames => ProjectSync(templateProjectItem, keepFileNames);

        }

        private static void ProjectSync(EnvDTE.ProjectItem templateProjectItem, List<String> keepFileNames) {

            var keepFileNameSet = new HashSet<String>(keepFileNames);

            var projectFiles = new Dictionary<String, EnvDTE.ProjectItem>();

            var originalFilePrefix = Path.GetFileNameWithoutExtension(templateProjectItem.FileNames[]) + ".";

            foreach (EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems)

                projectFiles.Add(projectItem.FileNames[], projectItem);

            // Remove unused items from the project

            foreach (var pair in projectFiles)

                if (!keepFileNames.Contains(pair.Key) && !(Path.GetFileNameWithoutExtension(pair.Key) + ".").StartsWith(originalFilePrefix))

                    pair.Value.Delete();

            // Add missing files to the project

            foreach(String fileName in keepFileNameSet)

                if (!projectFiles.ContainsKey(fileName))

                    templateProjectItem.ProjectItems.AddFromFile(fileName);

        }

        private void CheckoutFileIfRequired(String fileName) {

            var sc = dte.SourceControl;

            if (sc != null && sc.IsItemUnderSCC(fileName) && !sc.IsItemCheckedOut(fileName))

                checkOutAction.EndInvoke(checkOutAction.BeginInvoke(fileName, null, null));

        }

    }

} #>