@* Generator: WebPagesHelper *@

@using System.Globalization
@using System.Web
@using Microsoft.Internal.Web.Utils
@using Resources

@functions {
    private class FileUploadTracker {
        private static readonly object _countKey = new object();
        private static readonly object _scriptAlreadyRendered = new object();
        private readonly HttpContextBase _httpContext;

        public FileUploadTracker(HttpContextBase httpContext) {
            _httpContext = httpContext;
        }

        public bool ScriptAlreadyRendered {
            get {
                bool? rendered = _httpContext.Items[_scriptAlreadyRendered] as bool?;
                return rendered.HasValue && rendered.Value;
            }
            set {
                _httpContext.Items[_scriptAlreadyRendered] = value;
            }
        }

        public int RenderCount {
            get {
                int? count = _httpContext.Items[_countKey] as int?;
                if (!count.HasValue) {
                    count = 0;
                }
                return count.Value;
            }
            set {
                _httpContext.Items[_countKey] = value;
            }
        }
    }
}

@helper GetHtml(string name = null,
            int initialNumberOfFiles = 1,
            bool allowMoreFilesToBeAdded = true,
            bool includeFormTag = true,
            string addText = null,
            string uploadText = null) {
    @_GetHtml(new HttpContextWrapper(HttpContext.Current), name, initialNumberOfFiles, allowMoreFilesToBeAdded,
                includeFormTag, addText, uploadText)
}

@helper _GetHtml(HttpContextBase context, string name, int initialNumberOfFiles, 
        bool allowMoreFilesToBeAdded, bool includeFormTag, string addText, string uploadText) {
    
    if (initialNumberOfFiles < 0) {
        throw new ArgumentOutOfRangeException(
            "initialNumberOfFiles",
            String.Format(CultureInfo.InvariantCulture, CommonResources.Argument_Must_Be_GreaterThanOrEqualTo, "0"));
    }
    var tracker = new FileUploadTracker(context);
    int count = tracker.RenderCount++;

    name = name ?? "fileUpload";
    uploadText = uploadText ?? HelpersToolkitResources.FileUpload_Upload;
    addText = addText ?? HelpersToolkitResources.FileUpload_AddMore;


    if (allowMoreFilesToBeAdded && !tracker.ScriptAlreadyRendered) {
        tracker.ScriptAlreadyRendered = true;

        <script type="text/javascript"> 
            if (!window["FileUploadHelper"]) window["FileUploadHelper"] = {};  
            FileUploadHelper.addInputElement = function(index, name) {  
                var inputElem = document.createElement("input");  
                inputElem.type = "file";  
                inputElem.name = name;  
                var divElem = document.createElement("div");  
                divElem.appendChild(inputElem.cloneNode(false));   
                var inputs = document.getElementById("file-upload-" + index);  
                inputs.appendChild(divElem);  
            } 
        </script>
    }

    if (includeFormTag) {
        @:<form action="" enctype="multipart/form-data" method="post">
    }
    <div class="file-upload" id="file-upload-@(count)">
        @for(int i = 0; i < initialNumberOfFiles; i++) {
            <div>
                <input name="@name" type="file" />
            </div>
        }
    </div>

    if (allowMoreFilesToBeAdded || includeFormTag) {
        <div class="file-upload-buttons">
        @if (allowMoreFilesToBeAdded) {
            <a href="#" onclick="FileUploadHelper.addInputElement(@count, @HttpUtility.JavaScriptStringEncode(name, addDoubleQuotes: true)); return false;">@addText</a>
        }
        @if (includeFormTag) {
            <input type="submit" value="@uploadText" />
        }
        </div>
    }
    
    if (includeFormTag) {
        @:</form>
    }
}