using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace EnVisage.Code
{
    [AttributeUsage(AttributeTargets.Method, AllowMultiple = false)]
    public class ExportableToPdfAttribute : ActionFilterAttribute
    {
        private readonly string fileNameFormat;

        public ExportableToPdfAttribute(string fileNameFormat)
        {
            this.fileNameFormat = fileNameFormat;
        }

        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            if (filterContext.RequestContext.HttpContext.Request.QueryString.AllKeys.Contains("ExportToPdf"))
            {
                var urlHelper = new UrlHelper(filterContext.RequestContext);
                var actionName = filterContext.ActionDescriptor.ActionName;
                var controllerName = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName;
                var scheme = filterContext.HttpContext.Request.Url.Scheme;
                var url = urlHelper.Action(actionName, controllerName, null, scheme);
                var exporter = new PDFExporter();
                var pdfBuffer = exporter.ExportPage(url, 3, true, filterContext.HttpContext.Request.Cookies);

                var fileResult = new FileContentResult(pdfBuffer, "application/pdf");
                var fileName = string.Format(fileNameFormat, DateTime.Today);
                fileResult.FileDownloadName = fileName;
                filterContext.Result = fileResult;
            }
            else
            {
                base.OnActionExecuting(filterContext);
            }
        }
    }
}