using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Web.Razor.Generator;
using System.Web.Razor.Parser;
using System.Web.WebPages.Razor;

namespace System.Web.Mvc.Razor
{
    [SuppressMessage("Microsoft.Naming", "CA1702:CompoundWordsShouldBeCasedCorrectly", MessageId = "WebPage", Justification = "The class name is derived from the name of the base type")]
    public class MvcWebPageRazorHost : WebPageRazorHost
    {
        [SuppressMessage("Microsoft.Usage", "CA2214:DoNotCallOverridableMethodsInConstructors", Justification = "The NamespaceImports property should not be virtual. This is a temporary fix.")]
        public MvcWebPageRazorHost(string virtualPath, string physicalPath)
            : base(virtualPath, physicalPath)
        {
            RegisterSpecialFile(RazorViewEngine.ViewStartFileName, typeof(ViewStartPage));

            DefaultPageBaseClass = typeof(WebViewPage).FullName;

            // REVIEW get rid of the namespace import to not force additional references in default MVC projects
            GetRidOfNamespace("System.Web.WebPages.Html");
        }

        public override RazorCodeGenerator DecorateCodeGenerator(RazorCodeGenerator incomingCodeGenerator)
        {
            if (incomingCodeGenerator is CSharpRazorCodeGenerator)
            {
                return new MvcCSharpRazorCodeGenerator(incomingCodeGenerator.ClassName,
                                                       incomingCodeGenerator.RootNamespaceName,
                                                       incomingCodeGenerator.SourceFileName,
                                                       incomingCodeGenerator.Host);
            }
            else
            {
                return base.DecorateCodeGenerator(incomingCodeGenerator);
            }
        }

        public override ParserBase DecorateCodeParser(ParserBase incomingCodeParser)
        {
            if (incomingCodeParser is CSharpCodeParser)
            {
                return new MvcCSharpRazorCodeParser();
            }
            else if (incomingCodeParser is VBCodeParser)
            {
                return new MvcVBRazorCodeParser();
            }
            else
            {
                return base.DecorateCodeParser(incomingCodeParser);
            }
        }

        private void GetRidOfNamespace(string ns)
        {
            Debug.Assert(NamespaceImports.Contains(ns), ns + " is not a default namespace anymore");
            if (NamespaceImports.Contains(ns))
            {
                NamespaceImports.Remove(ns);
            }
        }
    }
}