calculate IBOND prices

multifol-io · Jan 9, 2024 · fa67c22 · fa67c22
1 parent 3a8d761
commit fa67c22
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Showing 7 changed files with 118 additions and 4 deletions.
diff --git a/Pages/Portfolio.razor b/Pages/Portfolio.razor
@@ -1087,7 +1087,7 @@
     }
     private async Task UpdateInvestmentsPrice(string ticker, List<Investment> investments)
     {
-        if (!string.IsNullOrEmpty(appData.EODHistoricalDataApiKey)) {
+        if (!string.IsNullOrEmpty(appData.EODHistoricalDataApiKey) && !string.IsNullOrEmpty(ticker)) {
             var quoteDataJson = await Http.GetStreamAsync($"https://api.bogle.tools/api/getquotes?ticker={ticker}&apikey={appData.EODHistoricalDataApiKey}");
             var quoteData = await JsonSerializer.DeserializeAsync<QuoteData>(quoteDataJson);
             if (quoteData?.Close != null) {
@@ -1279,6 +1279,11 @@
                         fetchQuote = investment.LastUpdated == null || investment.LastUpdated?.Date != previousMarketClose.Date;
                     }
 
+                    if (investment.AssetType == AssetType.IBond)
+                    {
+                        await CalculateIBondValue(investment);
+                    }
+
                     if (fetchQuote && investment.Ticker != null) {
                         if (!quotes.ContainsKey(investment.Ticker)) {
                             quotes.Add(investment.Ticker, new List<Investment> () { investment });
@@ -1322,6 +1327,111 @@
         refreshButtonText = "🔃 Quotes";
     }
 
+    public static Dictionary<string,List<double>>? IBondRates { get; set; }
+
+    async Task LoadIBondRates() {
+        IBondRates = new();
+        var ibondsUri = new Uri("https://raw.githubusercontent.com/bogle-tools/financial-variables/main/data/usa/treasury-direct/i-bond-rate-chart.csv");
+        var httpClient = new HttpClient();
+        var ibondsCsv = await httpClient.GetAsync(ibondsUri.AbsoluteUri);
+        var stream = await ibondsCsv.Content.ReadAsStreamAsync();
+        using var reader = new CsvReader(stream);
+        var RowEnumerator = reader.GetRowEnumerator().GetAsyncEnumerator();
+        await RowEnumerator.MoveNextAsync();
+        await RowEnumerator.MoveNextAsync();
+        while (await RowEnumerator.MoveNextAsync())
+        {
+            string[] chunks = RowEnumerator.Current;
+            int chunkNum = 0;
+            string? date = null;
+            List<double> rates = new();
+            foreach (var chunk in chunks)
+            {
+                switch (chunkNum) 
+                {
+                    case 0:
+                        date = chunk[..5];
+                        if (!char.IsDigit(date[0])) 
+                        {
+                            // lines at bottom of the csv file that don't start with a dates should be skipped.
+                            return;
+                        }
+                        break;
+                    case 1:
+                        break;
+                    default:
+                        if (string.IsNullOrEmpty(chunk))
+                        {
+                            continue;
+                        }
+                        else 
+                        {
+                            var rate = DoubleFromPercentageString(chunk);
+                            rates.Add(rate);
+                        }
+                        break;
+                }
+
+                chunkNum++;
+            }
+
+            IBondRates[date!] = rates;
+        }
+    }
+
+    string GetRateDate(int month, int year) 
+    {
+        if (month < 5) {
+            return "11/" + (year-1).ToString().Substring(2);
+        }
+        else if (month < 11) {
+            return "05/" + (year).ToString().Substring(2);
+        } else {
+            return "11/" + (year).ToString().Substring(2);
+        }
+    }
+
+    async Task CalculateIBondValue(Investment investment)
+    {
+        if (IBondRates == null) {
+            await LoadIBondRates();
+        }
+
+        if (IBondRates != null)
+        {
+            if (investment.PurchaseDate.HasValue)
+            {
+                var month = investment.PurchaseDate.Value.Month;
+                var year = investment.PurchaseDate.Value.Year;
+                var date = GetRateDate(month, year);
+                var rates = Portfolio.IBondRates[date];
+
+                var nowMonth = DateTime.Now.Month;
+                var nowYear = DateTime.Now.Year;
+                double value = investment.CostBasis ?? 0.0;
+                double bondQuantity = (value / 25.0);
+                for (int i = rates.Count - 1; i >= 0; i--)
+                {
+                    var monthCount = i > 0 ? 6 : GetMonthsLeft(investment.PurchaseDate.Value, DateTime.Now);
+                    value = (bondQuantity*Math.Round(value/bondQuantity*Math.Pow((1.0+rates[i]/2.0),((double)monthCount/6.0)),2));
+                }
+
+                investment.ValuePIN = (int)value;
+            }
+        }
+    }
+
+    private int GetMonthsLeft(DateOnly purchaseDate, DateTime now)
+    {
+        var months = ((now.Year - purchaseDate.Year) * 12 + now.Month - purchaseDate.Month) % 6;
+        return months;
+    }
+
+    private static double DoubleFromPercentageString(string value)
+    {
+        return double.Parse(value.Replace("%","")) / 100;
+    }
+
     enum MarketDay {
         MarketDay,
         Holiday,

diff --git a/Shared/Models/FamilyData/Account.cs b/Shared/Models/FamilyData/Account.cs
@@ -212,6 +212,7 @@ public void UpdateInvestmentCategoryTotals(Investment investment, FamilyData fam
                 case AssetType.Bond:
                 case AssetType.Bond_ETF:
                 case AssetType.Bond_Fund:
+                case AssetType.IBond:
                 case AssetType.InternationalBond:
                 case AssetType.InternationalBond_ETF:
                 case AssetType.InternationalBond_Fund:

diff --git a/Shared/Models/FamilyData/Advisor.cs b/Shared/Models/FamilyData/Advisor.cs
@@ -37,6 +37,7 @@ public static List<string> Advise(Investment investment, Account account, IAppDa
                             adviceItems.Add("2nd: international->taxable");
                         }
                         break;                    
+                    case AssetType.IBond:
                     case AssetType.Bond:
                     case AssetType.Bond_ETF:
                     case AssetType.Bond_Fund:

diff --git a/Shared/Models/FamilyData/AssetType.cs b/Shared/Models/FamilyData/AssetType.cs
@@ -7,6 +7,7 @@ public enum AssetType
     Cash,
     Cash_BankAccount,
     Cash_MoneyMarket,
+    IBond,
     InternationalStock,
     InternationalStock_ETF,
     InternationalStock_Fund,

diff --git a/Shared/Models/FamilyData/Investment.cs b/Shared/Models/FamilyData/Investment.cs
@@ -217,7 +217,7 @@ public int InvestmentOrder {
             {
                 global::AssetType.USStock or global::AssetType.USStock_ETF or global::AssetType.USStock_Fund or global::AssetType.Stock=> 1,
                 global::AssetType.InternationalStock or global::AssetType.InternationalStock_ETF or global::AssetType.InternationalStock_Fund => 2,
-                global::AssetType.Bond or global::AssetType.Bond_ETF or global::AssetType.Bond_Fund or global::AssetType.InternationalBond or global::AssetType.InternationalBond_ETF or global::AssetType.InternationalBond_Fund => 3,
+                global::AssetType.Bond or global::AssetType.IBond or global::AssetType.Bond_ETF or global::AssetType.Bond_Fund or global::AssetType.InternationalBond or global::AssetType.InternationalBond_ETF or global::AssetType.InternationalBond_Fund => 3,
                 global::AssetType.StocksAndBonds_ETF or global::AssetType.StocksAndBonds_Fund => 4,
                 global::AssetType.Cash or global::AssetType.Cash_BankAccount or global::AssetType.Cash_MoneyMarket => 5,
                 _ => 6,
@@ -334,6 +334,7 @@ public void UpdateValue() {
     public double? PreviousClose { get; set; }
     public double? PercentChange { get; set; }
     public DateTime? LastUpdated { get; set; }
+
     [JsonIgnore]
     public double Percentage { get; set; }
 }
diff --git a/wwwroot/cache.manifest b/wwwroot/cache.manifest
@@ -1,6 +1,6 @@
 CACHE MANIFEST
 
-# Version 1.0107
+# Version 1.0108
 
 NETWORK:
 *
diff --git a/wwwroot/data/funds.json b/wwwroot/data/funds.json