yavsc/Yavsc/ViewComponents/EstimateViewComponent.cs

using System;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNet.Mvc;
using Microsoft.Data.Entity;
using Yavsc.Models;
using Yavsc.Models.Billing;
using Yavsc.ViewModels.Gen;

namespace Yavsc.ViewComponents
{
    public class EstimateViewComponent : ViewComponent
    {
        ApplicationDbContext dbContext;
        public EstimateViewComponent(ApplicationDbContext dbContext)
        {
            this.dbContext = dbContext;
        }
        public async Task<IViewComponentResult> InvokeAsync(long id)
        {
            return await InvokeAsync(id,"Html");
        }

        public async Task<IViewComponentResult> InvokeAsync(long id, string outputFormat ="Html")
        {
            return await Task.Run( ()=> {
             Estimate estimate =
            dbContext.Estimates.Include(x => x.Query)
                   .Include(x => x.Query.Client)
                   .Include(x => x.Query.PerformerProfile)
                   .Include(x => x.Query.PerformerProfile.OrganizationAddress)
                   .Include(x => x.Query.PerformerProfile.Performer)
                   .Include(e => e.Bill).FirstOrDefault(x => x.Id == id);
            if (estimate == null)
                throw new Exception("No data");

            if (outputFormat == "LaTeX") {
                return this.View("Estimate_tex", estimate);
            }
            else if (outputFormat == "Pdf") 
            {
                // Sorry for this code
                string tex = null;
                var oldWriter = ViewComponentContext.ViewContext.Writer;
                using (var writer = new StringWriter())
                {
                    this.ViewComponentContext.ViewContext.Writer = writer;

                    var resultTex = View("Estimate_tex", estimate);
                    resultTex.Execute(this.ViewComponentContext);
                    tex = writer.ToString();

                }
                ViewComponentContext.ViewContext.Writer = oldWriter;
                
                return this.View("Estimate_pdf", 
                        new PdfGenerationViewModel{ 
                            TeXSource = tex, 
                            DestDir = Startup.UserBillsDirName,
                            BaseFileName = $"estimate-{id}"
                        } );
            }
            return View("Default",estimate);
                }
            );
        }

    }
}