@model object
@{
    Layout = "_FieldLayout.cshtml";
}
@{
    var htmlAttributes = new RouteValueDictionary();

    if (ViewData.ContainsKey("type"))
    {
        htmlAttributes.Add("type", ViewData["type"]);
    }

    var controlClass = "form-control";

    if (ViewBag.@class != null)
    {
        controlClass = string.Concat(controlClass, " ", ViewBag.@class);
    }

    if (ViewBag.placeholder != null)
    {
        htmlAttributes.Add("placeholder", ViewBag.placeholder);
    }

    if (ViewData.ModelState.ContainsKey(ViewData.TemplateInfo.HtmlFieldPrefix) &&
        ViewData.ModelState[ViewData.TemplateInfo.HtmlFieldPrefix].Errors.Any())
    {
        controlClass = string.Concat(controlClass, " ", "is-invalid");
    }
    htmlAttributes.Add("class", controlClass);


    var inputGroupClass = "";
    if (!string.IsNullOrEmpty(ViewBag.size))
    {
        if (ViewBag.size == "small")
        {
            inputGroupClass = "input-group-sm";
        }
        else if (ViewBag.size == "large")
        {
            inputGroupClass = "input-group-lg";
        }
    }
}

<div class="input-group @inputGroupClass">
    @if (!string.IsNullOrEmpty(ViewBag.prepend))
    {
        <div class="input-group-prepend">
            <span class="input-group-text" id="basic-addon2">@Html.Raw(ViewBag.prepend)</span>
        </div>
    }
    @Html.TextBox("", ViewData.TemplateInfo.FormattedModelValue, htmlAttributes)
    @if (!string.IsNullOrEmpty(ViewBag.append))
    {
        <div class="input-group-append">
            <span class="input-group-text" id="basic-addon2">@Html.Raw(ViewBag.append)</span>
        </div>
    }
</div>