From d77a70c48865592be9029aeb0c83b36c162ea31a Mon Sep 17 00:00:00 2001
From: Kostya <mail@sartin.in>
Date: Fri, 14 Aug 2026 20:54:31 +0000
Subject: Switch TradingMechanism quantities to int, add yes/no and select
 prompts

TradingMechanism's q/quantity params move from long/long[] to int/int[]
to match the rest of the domain (Trade.quantity, Option counts, etc.
are already int).

Add InputProcessor.readYesNo and readSelect for upcoming menu commands
that need a confirm prompt or a pick-from-list prompt.
---
 .../service/mechanism/LmsrTradingMechanism.java    |  4 +--
 .../mechanism/OrderBookTradingMechanism.java       |  4 +--
 .../guess/service/mechanism/TradingMechanism.java  |  4 +--
 .../market/guess/ui/console/io/InputProcessor.java | 29 ++++++++++++++++++++++
 4 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java b/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java
index 02a63df..1904a04 100644
--- a/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java
+++ b/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java
@@ -23,13 +23,13 @@ public final class LmsrTradingMechanism implements TradingMechanism {
   }
 
   @Override
-  public BigDecimal costOfBuying(long[] q, int optionIndex, long quantity) {
+  public BigDecimal costOfBuying(int[] q, int optionIndex, int quantity) {
     // TODO Auto-generated method stub
     throw new UnsupportedOperationException("Unimplemented method 'costOfBuying'");
   }
 
   @Override
-  public double[] prices(long[] q) {
+  public double[] prices(int[] q) {
     // TODO Auto-generated method stub
     throw new UnsupportedOperationException("Unimplemented method 'prices'");
   }
diff --git a/service/src/main/java/market/guess/service/mechanism/OrderBookTradingMechanism.java b/service/src/main/java/market/guess/service/mechanism/OrderBookTradingMechanism.java
index 62feb02..5807e45 100644
--- a/service/src/main/java/market/guess/service/mechanism/OrderBookTradingMechanism.java
+++ b/service/src/main/java/market/guess/service/mechanism/OrderBookTradingMechanism.java
@@ -27,13 +27,13 @@ public final class OrderBookTradingMechanism implements TradingMechanism {
   }
 
   @Override
-  public BigDecimal costOfBuying(long[] q, int optionIndex, long quantity) {
+  public BigDecimal costOfBuying(int[] q, int optionIndex, int quantity) {
     // TODO Auto-generated method stub
     throw new UnsupportedOperationException("Unimplemented method 'costOfBuying'");
   }
 
   @Override
-  public double[] prices(long[] q) {
+  public double[] prices(int[] q) {
     // TODO Auto-generated method stub
     throw new UnsupportedOperationException("Unimplemented method 'prices'");
   }
diff --git a/service/src/main/java/market/guess/service/mechanism/TradingMechanism.java b/service/src/main/java/market/guess/service/mechanism/TradingMechanism.java
index d6e38bc..c2fc865 100644
--- a/service/src/main/java/market/guess/service/mechanism/TradingMechanism.java
+++ b/service/src/main/java/market/guess/service/mechanism/TradingMechanism.java
@@ -9,7 +9,7 @@ public interface TradingMechanism {
 
   BigDecimal openingCost(int optionCount);
 
-  BigDecimal costOfBuying(long[] q, int optionIndex, long quantity);
+  BigDecimal costOfBuying(int[] q, int optionIndex, int quantity);
 
-  double[] prices(long[] q);
+  double[] prices(int[] q);
 }
diff --git a/ui-console/src/main/java/market/guess/ui/console/io/InputProcessor.java b/ui-console/src/main/java/market/guess/ui/console/io/InputProcessor.java
index 4889c36..fc5422f 100644
--- a/ui-console/src/main/java/market/guess/ui/console/io/InputProcessor.java
+++ b/ui-console/src/main/java/market/guess/ui/console/io/InputProcessor.java
@@ -1,6 +1,8 @@
 package market.guess.ui.console.io;
 
+import java.util.List;
 import java.util.Scanner;
+import java.util.function.Function;
 
 public final class InputProcessor {
   private final Scanner scanner = new Scanner(System.in);
@@ -67,6 +69,33 @@ public final class InputProcessor {
     }
   }
 
+  public boolean readYesNo(String prompt) {
+    while (true) {
+      var raw = readLine("%s [Y/N]: ".formatted(prompt)).toLowerCase();
+
+      switch (raw) {
+        case "y", "yes" -> {
+          return true;
+        }
+        case "n", "no" -> {
+          return false;
+        }
+        default -> IO.println("Please answer y/yes or n/no.");
+      }
+    }
+  }
+
+  public <T> T readSelect(String prompt, List<T> items, Function<T, String> function) {
+
+    for (var i = 0; i < items.size(); i++) {
+      IO.println("   [%d]->> %s".formatted(i + 1, function.apply(items.get(i))));
+    }
+
+    var pick = readInt(prompt, 1, items.size());
+
+    return items.get(pick - 1);
+  }
+
   private String nextLine() {
     return scanner.hasNextLine() ? scanner.nextLine() : null;
   }
-- 
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