Add reign initizalization

53_King/csharp/IOExtensions.cs

@@ -0,0 +1,43 @@
+using System.Diagnostics.CodeAnalysis;
+using static King.Resources.Resource;
+
+namespace King;
+
+internal static class IOExtensions
+{
+    internal static bool TryReadGameData(this IReadWrite io, IRandom random, [NotNullWhen(true)] out Reign? reign)
+    {
+        if (io.TryReadValue(SavedYearsPrompt, v => v < Reign.MaxTerm, SavedYearsError(Reign.MaxTerm), out var years) &&
+            io.TryReadValue(SavedTreasuryPrompt, out var rallods) &&
+            io.TryReadValue(SavedCountrymenPrompt, out var countrymen) &&
+            io.TryReadValue(SavedWorkersPrompt, out var workers) &&
+            io.TryReadValue(SavedLandPrompt, v => v is > 1000 and <= 2000, SavedLandError, out var land))
+        {
+            reign = new Reign(io, new Country(random, rallods, countrymen, workers, land), years + 1);
+            return true;
+        }
+
+        reign = default;
+        return false;
+    }
+
+    private static bool TryReadValue(this IReadWrite io, string prompt, out float value)
+        => io.TryReadValue(prompt, _ => true, "", out value);
+    
+    private static bool TryReadValue(
+        this IReadWrite io,
+        string prompt,
+        Predicate<float> isValid,
+        string error,
+        out float value)
+    {
+        while (true)
+        {
+            value = io.ReadNumber(prompt);
+            if (value < 0) { return false; }
+            if (isValid(value)) { return true; }
+            
+            io.Write(error);
+        }
+    }
+}