Gremlin/Gremlin/MVVM/ViewModels/QuoteViewModel.cs

using Caliburn.Micro;
using Microsoft.Win32;
using System;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.IO;
using System.Linq;

namespace Gremlin.MVVM
{
	public class QuoteViewModel : PropertyChangedBase
	{
		private string _quoteType = "ein Analysegerät";
		private string _quotePath = AppDomain.CurrentDomain.BaseDirectory;
		private ObservableCollection<LineItemViewModel> _lineItemsVM = new();
		private ContactViewModel _recipient = new();
		private ContactViewModel _salesRep = new();
		private string _quoteNumber;
		private int _warranty = 12;
		private int _validity = 60;
		private decimal _vAT = 19;
		private decimal _freight = 1;
		private bool? _showBrutto = true;
		private bool? _singlePrices = true;
		private bool? _attachBrochures;
		private bool? _attachDataSheets;
		private bool? _useMailTemplate;
		private bool? _showDiscounts = true;
		private int _oppID;
		private bool _preisinformation = false;

		public string QuoteType { get => _quoteType; set { _quoteType = value; NotifyOfPropertyChange(() => QuoteType); } }
		public string QuotePath { get => _quotePath; set { _quotePath = CorrectQuotePath(value); NotifyOfPropertyChange(() => QuotePath); } }
		public bool? ShowBrutto { get => _showBrutto; set { _showBrutto = value; NotifyOfPropertyChange(() => ShowBrutto); } }
		public string QuoteNumber { get => _quoteNumber; set { _quoteNumber = value; NotifyOfPropertyChange(() => QuoteNumber); } }
		public int Warranty { get => _warranty; set { _warranty = value; NotifyOfPropertyChange(() => Warranty); } }
		public int Validity { get => _validity; set { _validity = value; NotifyOfPropertyChange(() => Validity); } }
		public bool? SinglePrices { get => _singlePrices; set { _singlePrices = value; NotifyOfPropertyChange(() => SinglePrices); } }
		public bool? AttachBrochures { get => _attachBrochures; set { _attachBrochures = value; NotifyOfPropertyChange(() => AttachBrochures); } }
		public bool? AttachDataSheets { get => _attachDataSheets; set { _attachDataSheets = value; NotifyOfPropertyChange(() => AttachDataSheets); } }
		public bool? UseMailTemplate { get => _useMailTemplate; set { _useMailTemplate = value; NotifyOfPropertyChange(() => UseMailTemplate); } }
		public bool? ShowDiscounts { get => _showDiscounts; set { _showDiscounts = value; NotifyOfPropertyChange(() => ShowDiscounts); } }
		public decimal VAT { get => _vAT; set { _vAT = value; NotifyOfPropertyChange(() => VAT); } }
		public int OppID { get => _oppID; set { _oppID = value; NotifyOfPropertyChange(() => OppID); } }
		public bool Preisinformation { get => _preisinformation; set { _preisinformation = value; NotifyOfPropertyChange(() => Preisinformation); } }
		public decimal Freight { get => _freight; set { _freight = value; NotifyOfPropertyChange(() => Freight); } }

		public ObservableCollection<LineItemViewModel> LineItemsViewModel { get => _lineItemsVM; set { _lineItemsVM = value; NotifyOfPropertyChange(() => LineItemsViewModel); } }
		public ContactViewModel Recipient { get => _recipient; set { _recipient = value; NotifyOfPropertyChange(() => Recipient); } }
		public ContactViewModel SalesRep { get => _salesRep; set { _salesRep = value; NotifyOfPropertyChange(() => SalesRep); } }

		public decimal TotalListprice => GetTotal("TotalListprice");
		public decimal AverageDiscount => GetTotal("AverageDiscount");
		public decimal TotalNet => GetTotal("TotalNet");
		public decimal TotalFreightOnly => TotalNet * Freight / 100;
		public decimal TotalFreight => TotalNet * (1 + VAT) / 100;
		public decimal TotalVAT => TotalFreight * VAT / 100;
		public decimal TotalGross => TotalNet * (1 + VAT) / 100;

		public bool QuoteContains3PP => DoesContains("3PP");
		public bool QuoteContainsRB => DoesContains("RB");

		public QuoteViewModel(ContactViewModel salesRep)
		{
			Random random = new();
			SalesRep = salesRep;
			QuoteNumber = SalesRep.LastName switch
			{
				"Woitschetzki" => $"DE-83PE89-{DateTime.Now:My}-{random.Next(999999)}",
				"Welsch" => $"DE-83RE32-{DateTime.Now:My}-{random.Next(999999)}",
				_ => $"DE-XXYYXX-{DateTime.Now:My}-{random.Next(999999)}",
			};
		}

		public QuoteViewModel()
		{
			GenerateQuoteNumber();
			GenerateOppID();
		}

		public void GenerateOppID()
		{
			Random random = new();
			OppID = random.Next(111111111, 999999999);
		}

		private QuoteViewModel(string quoteNumber, string quoteType, ContactViewModel recipient, ContactViewModel salesRep, bool? brutto, decimal vAT, int warranty, int validity, string quotePath, bool? singlePrices, bool? brochures, bool? dataSheets, bool? mailTemplate, bool? showDiscounts)
		{
			QuoteNumber = quoteNumber;
			QuoteType = quoteType;
			Recipient = recipient;
			SalesRep = salesRep;
			ShowBrutto = brutto;
			VAT = vAT;
			Warranty = warranty;
			Validity = validity;
			QuotePath = quotePath;
			SinglePrices = singlePrices;
			AttachBrochures = brochures;
			AttachDataSheets = dataSheets;
			UseMailTemplate = mailTemplate;
			ShowDiscounts = showDiscounts;
		}

		internal static QuoteViewModel CreateQuote(string quoteNumber, ContactViewModel recipient, ContactViewModel salesRep, decimal vAT = 19, string quoteType = "ein Analysegerät", bool? brutto = true, int warranty = 12, bool? singlePrices = true, bool? brochures = true, bool? dataSheets = true, bool? mailTemplate = true, string quotePath = "", int validity = 60, bool? showDiscounts = true)
		{
			QuoteViewModel quoteVM = new(quoteNumber, quoteType, recipient, salesRep, brutto, vAT, warranty, validity, quotePath, singlePrices, brochures, dataSheets, mailTemplate, showDiscounts);
			quoteVM.LineItemsViewModel = new();

			ObservableCollection<LineItemViewModel> lineItemsVM = LineItemViewModel.ReadLineItemsFromClipboard();

			if (lineItemsVM == null) return null;

			foreach (LineItemViewModel lineItemVM in lineItemsVM)
			{
				if (lineItemVM.OptionNumber.StartsWith("8D"))
				{
					quoteVM.Warranty = int.Parse(lineItemVM.OptionNumber.Last().ToString()) * 12;
				}

				quoteVM.LineItemsViewModel.Add(lineItemVM);
			}

			return quoteVM;
		}

		public void GenerateQuoteNumber()
		{
			Random random = new();
			QuoteNumber = SalesRep.LastName switch
			{
				"Woitschetzki" => $"DE-83PE89-{DateTime.Now:My}-{random.Next(999999)}",
				"Welsch" => $"DE-83RE32-{DateTime.Now:My}-{random.Next(999999)}",
				_ => $"DE-XXYYXX-{DateTime.Now:My}-{random.Next(999999)}",
			};
		}

		public void ReadLineItems()
		{
			LineItemsViewModel = LineItemViewModel.ReadLineItemsFromClipboard();
		}

		private static string CorrectQuotePath(string quotePath)
		{
			if (quotePath.EndsWith("\\"))
				return quotePath;
			else
				return $"{quotePath}\\";
		}

		public void ChooseQuotePath()
		{
			OpenFileDialog openFileDialog = new()
			{
				Multiselect = false,
				InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
			};

			if (openFileDialog.ShowDialog() == true)
			{
				FileInfo fileInfo = new(openFileDialog.FileName);
				QuotePath = fileInfo.DirectoryName;
			}
		}

		private decimal GetTotal(string type)
		{
			decimal total = 0;

			foreach (LineItemViewModel lineItemVM in LineItemsViewModel)
			{
				switch (type)
				{
					case "TotalListprice":
						total += lineItemVM.ListPrice;
						break;
					case "TotalNet":
						total += lineItemVM.CalcTotalNet;
						break;
					case "AverageDiscount":
						total += lineItemVM.TotalDiscount;
						break;
				}
			}

			if (type == "AverageDiscount" & LineItemsViewModel.Count != 0) { total /= LineItemsViewModel.Count; }

			Debug.WriteLine($"{type} = {total}");
			return total;
		}


		private bool DoesContains(string type)
		{
			foreach (LineItemViewModel lineItemVM in LineItemsViewModel)
			{
				switch (type)
				{
					case "3PP":
						if (lineItemVM.ProductLine == "3PP")
						{
							Debug.WriteLine($"Quote containts 3PP with ProductNumber {lineItemVM.ProductNumber}");
							NotifyOfPropertyChange(() => QuoteContains3PP);
							return true;
						}
						break;
					case "RB":
						if (lineItemVM.ProductLine == "RB" & lineItemVM.ProductNumber != "R2005A")
						{
							Debug.WriteLine($"Quote containts RB with ProductNumber {lineItemVM.ProductNumber}");
							NotifyOfPropertyChange(() => QuoteContainsRB);
							return true;
						}
						break;
				}
			}
			return false;
		}
	}
}