1 |
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2 | using System;
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3 | using System.Collections.Generic;
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4 | using System.Configuration;
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5 | using System.Diagnostics;
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6 | using System.Linq;
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7 | using System.Threading;
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8 | using HeuristicLab.Services.Optimization.Billing.Business;
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9 | using HeuristicLab.Services.Optimization.Billing.Interfaces;
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10 | using HeuristicLab.Services.Optimization.Billing.Model;
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11 | namespace HeuristicLab.Services.Optimization.Billing.BillingEngine {
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12 | public class BillingEngine {
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13 | private bool stop;
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14 | private AutoResetEvent waitHandle;
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15 | private TimeSpan interval;
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16 | private DateTime currentDate;
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17 |
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18 | private IOptimizationBilling billingService;
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19 | public IOptimizationBilling BillingService {
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20 | get {
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21 | if (billingService == null) {
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22 | billingService = new BillingService();
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23 | }
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24 | return billingService;
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25 | }
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26 | set { billingService = value; }
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27 | }
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28 |
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29 | private IInvoiceFormattingEngine invoiceFormattingEngine;
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30 | public IInvoiceFormattingEngine InvoiceFormattingEngine {
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31 | get {
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32 | if (invoiceFormattingEngine == null) {
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33 | invoiceFormattingEngine = new PlainTextInvoiceFormattingEngine();
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34 | }
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35 | return invoiceFormattingEngine;
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36 | }
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37 | set { invoiceFormattingEngine = value; }
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38 | }
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39 |
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40 | public BillingEngine() {
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41 | stop = false;
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42 | interval = TimeSpan.Parse(ConfigurationManager.AppSettings["BillingEngineInterval"]);
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43 | waitHandle = new AutoResetEvent(true);
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44 | }
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45 |
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46 | public void StopBillingEngine() {
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47 | stop = true;
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48 | waitHandle.Set();
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49 | }
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50 |
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51 | public void Run() {
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52 | while (!stop) {
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53 | try {
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54 | Trace.WriteLine("[BillingEngine] Start billing cycle");
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55 | //currentDate = DateTime.Parse(DateTime.Now.ToShortDateString());
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56 | currentDate = DateTime.Now.Date;
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57 | Trace.WriteLine(string.Format("[BillingEngine] Current date: {0}", currentDate));
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58 | IList<Order> activeOrders = BillingService.GetOrdersByState(OrderState.Active);
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59 | Trace.WriteLine(string.Format("[BillingEngine] Processing {0} active orders.", activeOrders.Count));
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60 | foreach (Order order in activeOrders) {
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61 | if (!order.NextBillableDay.HasValue) {
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62 | // there has never been an invoice generated from this order
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63 | order.NextBillableDay = currentDate;
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64 | }
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65 |
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66 | if (order.NextBillableDay >= currentDate) {
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67 | // TODO: Embed everything in a transaction
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68 |
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69 | // Collect Usage Data
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70 | //IList<UsageRecord> usageRecrods = BillingService.GetUsageRecords(order.User.Name, order.LastBillableDay.Value, currentDate);
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71 |
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72 | // Collect Invoice Data
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73 | Invoice invoice = new Invoice();
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74 | invoice.Order = order;
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75 | invoice.User = order.User;
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76 | invoice.Due = currentDate.AddMonths(1);
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77 | invoice.InvoiceDate = currentDate;
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78 | invoice.Status = InvoiceStatus.Open;
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79 | invoice.InvoiceLines = new List<InvoiceLine>();
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80 | foreach (OrderLine orderLine in order.OrderLines) {
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81 | InvoiceLine invoiceLine = new InvoiceLine();
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82 | invoiceLine.Invoice = invoice;
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83 | invoiceLine.Product = orderLine.Product;
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84 | invoiceLine.ProductPrice = orderLine.ProductPrice;
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85 | invoiceLine.Quantity = invoiceLine.Quantity;
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86 | invoice.InvoiceLines.Add(invoiceLine);
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87 | }
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88 |
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89 | InvoiceLine usageCharges = new InvoiceLine();
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90 | usageCharges.Invoice = invoice;
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91 | usageCharges.Product = billingService.GetProductByName("Oaas Usage Charges").First();
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92 | usageCharges.ProductPrice = 999.99;
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93 | usageCharges.Quantity = 1;
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94 | invoice.InvoiceLines.Add(usageCharges);
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95 |
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96 | // Bill Post Processing: Apply Discounts or Promotions
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97 | // eg. add discounts
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98 | // sum up items to sub-total, calc. tax -> total current charges
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99 |
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100 | // Invoice Formatting Engine: Generate Invoice
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101 | invoice.InvoiceDocument = InvoiceFormattingEngine.Generate(invoice);
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102 |
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103 | UpdateBillingState(order);
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104 | billingService.UpdateOrder(order);
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105 | }
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106 | }
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107 |
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108 | Trace.WriteLine("[BillingEngine] Finished billing cycle");
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109 | }
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110 | catch (Exception e) {
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111 | Trace.WriteLine(string.Format("[BillingEngine] The following exception occured: {0}", e.ToString()));
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112 | }
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113 | waitHandle.WaitOne(interval);
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114 | }
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115 | waitHandle.Close();
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116 | }
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117 |
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118 | private void UpdateBillingState(Order order) {
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119 | if (order.ActiveUntil != null && order.ActiveUntil == order.NextBillableDay) {
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120 | order.NextBillableDay = null;
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121 | order.State = OrderState.Finished;
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122 | }
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123 |
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124 | DateTime nextBillingDay = CalculateNextBillingDate(order);
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125 |
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126 | if (order.ActiveUntil != null && order.ActiveUntil < nextBillingDay) {
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127 | order.NextBillableDay = nextBillingDay;
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128 | }
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129 | }
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130 |
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131 | private DateTime CalculateNextBillingDate(Order order) {
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132 | DateTime nextBillingDay = currentDate;
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133 |
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134 | if (order.BillingPeriod == BillingPeriod.Weekly) {
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135 | nextBillingDay = nextBillingDay.AddDays(7);
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136 | } else if (order.BillingPeriod == BillingPeriod.Monthly) {
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137 | if (order.BillingType == BillingType.Pre) {
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138 | nextBillingDay = nextBillingDay.AddDays(DateTime.DaysInMonth(nextBillingDay.Year, nextBillingDay.Month) + 1);
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139 | } else if (order.BillingType == BillingType.Post) {
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140 | if (nextBillingDay.Month == 12) {
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141 | nextBillingDay = nextBillingDay.AddDays(DateTime.DaysInMonth(nextBillingDay.Year + 1, 1) + 1);
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142 | } else {
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143 | nextBillingDay = nextBillingDay.AddDays(DateTime.DaysInMonth(nextBillingDay.Year, nextBillingDay.Month + 1) + 1);
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144 | }
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145 | }
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146 | } else if (order.BillingPeriod == BillingPeriod.Yearly) {
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147 | if (order.BillingType == BillingType.Pre) {
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148 | nextBillingDay = new DateTime(DateTime.Now.Year + 1, 1, 1);
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149 | } else if (order.BillingType == BillingType.Post) {
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150 | nextBillingDay = new DateTime(DateTime.Now.Year + 1, 12, 31);
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151 | }
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152 | }
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153 |
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154 | return nextBillingDay;
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155 | }
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156 | }
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157 | }
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