// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.

using System;
using System.Web.Mvc;
using Microsoft.Web.Mvc.Properties;

namespace Microsoft.Web.Mvc
{
    public static class ScriptExtensions
    {
        public static MvcHtmlString Script(this HtmlHelper helper, string releaseFile)
        {
            return Script(helper, releaseFile, releaseFile);
        }

        public static MvcHtmlString Script(this HtmlHelper helper, string releaseFile, string debugFile)
        {
            if (String.IsNullOrEmpty(releaseFile))
            {
                throw new ArgumentException(MvcResources.Common_NullOrEmpty, "releaseFile");
            }
            if (String.IsNullOrEmpty(debugFile))
            {
                throw new ArgumentException(MvcResources.Common_NullOrEmpty, "debugFile");
            }

            string src;
            string file = helper.ViewContext.HttpContext.IsDebuggingEnabled ? debugFile : releaseFile;
            if (IsRelativeToDefaultPath(file))
            {
                src = "~/Scripts/" + file;
            }
            else
            {
                src = file;
            }

            TagBuilder scriptTag = new TagBuilder("script");
            scriptTag.MergeAttribute("type", "text/javascript");
            scriptTag.MergeAttribute("src", UrlHelper.GenerateContentUrl(src, helper.ViewContext.HttpContext));
            return MvcHtmlString.Create(scriptTag.ToString(TagRenderMode.Normal));
        }

        internal static bool IsRelativeToDefaultPath(string file)
        {
            return !(file.StartsWith("~", StringComparison.Ordinal) ||
                     file.StartsWith("../", StringComparison.Ordinal) ||
                     file.StartsWith("/", StringComparison.Ordinal) ||
                     file.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ||
                     file.StartsWith("https://", StringComparison.OrdinalIgnoreCase));
        }
    }
}
