Implement LMSR and order-book trading logic, wire MarketContext facade and new menu commands

Fill in the previously stubbed cost/pricing math for both trading
mechanisms, and give OrderBookTradingMechanism an actual matching engine
with resting bid/ask books. Fold EventRepository/UserRepository access
into a single MarketContext used by LocalGuessMarketContext, and move the
repository package under infrastructure. Add Buy/EventDetails/LoadState/
SaveState/SettleEvent console commands and wire them into App/Menu.

8 files changed, 242 insertions, 19 deletions

diff --git a/ui-console/src/main/java/market/guess/ui/console/App.java b/ui-console/src/main/java/market/guess/ui/console/App.java
index 3d42e9b..330498c 100644
--- a/ui-console/src/main/java/market/guess/ui/console/App.java
+++ b/ui-console/src/main/java/market/guess/ui/console/App.java
@@ -4,16 +4,22 @@ import market.guess.api.GuessMarketContext;
 import market.guess.service.LocalGuessMarketContext;
 import market.guess.service.TradingOperation;
 import market.guess.service.TradingOperationImpl;
+import market.guess.service.infrastructure.MarketContext;
 import market.guess.service.infrastructure.mapper.v1.EventMapperV1;
 import market.guess.service.infrastructure.provider.Loader;
 import market.guess.service.infrastructure.provider.v1.XMLLoaderV1;
-import market.guess.service.repository.EventRepository;
-import market.guess.service.repository.InMemoryEventRepository;
-import market.guess.service.repository.InMemoryUserRepository;
-import market.guess.service.repository.UserRepository;
+import market.guess.service.infrastructure.repository.EventRepository;
+import market.guess.service.infrastructure.repository.InMemoryEventRepository;
+import market.guess.service.infrastructure.repository.InMemoryUserRepository;
+import market.guess.service.infrastructure.repository.UserRepository;
+import market.guess.ui.console.command.BuyMenuCommand;
+import market.guess.ui.console.command.EventDetailsMenuCommand;
 import market.guess.ui.console.command.ExitMenuCommand;
 import market.guess.ui.console.command.ListEventsMenuCommand;
 import market.guess.ui.console.command.LoadFileMenuCommand;
+import market.guess.ui.console.command.LoadMarketStateMenuCommand;
+import market.guess.ui.console.command.SaveMarketStateMenuCommand;
+import market.guess.ui.console.command.SettleEventMenuCommand;
 import market.guess.ui.console.io.InputProcessor;
 import org.picocontainer.DefaultPicoContainer;
 import org.picocontainer.behaviors.Caching;
@@ -24,7 +30,7 @@ public class App {
 
     pico.addComponent(EventRepository.class, InMemoryEventRepository.class);
     pico.addComponent(UserRepository.class, InMemoryUserRepository.class);
-
+    pico.addComponent(MarketContext.class);
     pico.addComponent(TradingOperation.class, TradingOperationImpl.class);
     pico.addComponent(EventMapperV1.class);
     pico.addComponent(Loader.class, XMLLoaderV1.class);
@@ -33,6 +39,11 @@ public class App {
     pico.addComponent(LoadFileMenuCommand.class);
     pico.addComponent(ListEventsMenuCommand.class);
     pico.addComponent(ExitMenuCommand.class);
+    pico.addComponent(BuyMenuCommand.class);
+    pico.addComponent(SettleEventMenuCommand.class);
+    pico.addComponent(EventDetailsMenuCommand.class);
+    pico.addComponent(LoadMarketStateMenuCommand.class);
+    pico.addComponent(SaveMarketStateMenuCommand.class);
 
     pico.addComponent(InputProcessor.class);
     pico.addComponent(Menu.class);
diff --git a/ui-console/src/main/java/market/guess/ui/console/Menu.java b/ui-console/src/main/java/market/guess/ui/console/Menu.java
index 18b72b7..90ddd38 100644
--- a/ui-console/src/main/java/market/guess/ui/console/Menu.java
+++ b/ui-console/src/main/java/market/guess/ui/console/Menu.java
@@ -1,5 +1,6 @@
 package market.guess.ui.console;
 
+import java.util.Comparator;
 import java.util.List;
 import market.guess.ui.console.command.MenuCommand;
 import market.guess.ui.console.io.InputProcessor;
@@ -10,7 +11,8 @@ public final class Menu implements Startable {
   private final List<MenuCommand> commands;
 
   public Menu(List<MenuCommand> commands, InputProcessor io) {
-    this.commands = commands;
+    this.commands =
+        commands.stream().sorted(Comparator.comparingInt(MenuCommand::getIndex)).toList();
     this.io = io;
   }
 
@@ -19,8 +21,11 @@ public final class Menu implements Startable {
     var max = commands.stream().mapToInt(MenuCommand::getIndex).max().orElse(0);
     io.splashScreen();
     while (true) {
-      printMenu();
 
+      io.newLine();
+      for (var command : commands) {
+        io.println("    [%d]->> %s".formatted(command.getIndex(), command.getName()));
+      }
       var selection = io.readInt("Choose a command: ", 1, max);
       var commandOptional = commands.stream().filter(c -> c.getIndex() == selection).findFirst();
 
@@ -32,7 +37,9 @@ public final class Menu implements Startable {
 
       command.execute();
 
-      if (command.isExit()) return;
+      if (command.isExit()) {
+        break;
+      }
     }
   }
 
@@ -40,11 +47,4 @@ public final class Menu implements Startable {
   public void stop() {
     // Do nothing.
   }
-
-  private void printMenu() {
-    io.newLine();
-    for (var command : commands) {
-      io.println("    [%d]->> %s".formatted(command.getIndex(), command.getName()));
-    }
-  }
 }
diff --git a/ui-console/src/main/java/market/guess/ui/console/command/BuyMenuCommand.java b/ui-console/src/main/java/market/guess/ui/console/command/BuyMenuCommand.java
new file mode 100644
index 0000000..b8e2523
--- /dev/null
+++ b/ui-console/src/main/java/market/guess/ui/console/command/BuyMenuCommand.java
@@ -0,0 +1,74 @@
+package market.guess.ui.console.command;
+
+import market.guess.api.EventStatus;
+import market.guess.api.GuessMarketContext;
+import market.guess.exception.GuessMarketException;
+import market.guess.ui.console.io.InputProcessor;
+
+public final class BuyMenuCommand implements MenuCommand {
+  private final GuessMarketContext context;
+  private final InputProcessor io;
+
+  public BuyMenuCommand(GuessMarketContext context, InputProcessor io) {
+    super();
+    this.context = context;
+    this.io = io;
+  }
+
+  @Override
+  public int getIndex() {
+    return 4;
+  }
+
+  @Override
+  public String getName() {
+    return "Buy share(s) in an event";
+  }
+
+  @Override
+  public boolean allowed() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'allowed'");
+  }
+
+  @Override
+  public void execute() {
+    var active =
+        context.listEvents().stream()
+            .filter(event -> event.status() == EventStatus.ACTIVE)
+            .toList();
+
+    if (active.isEmpty()) {
+      io.println("There are currently no active events to trade on.");
+      return;
+    }
+
+    var pick =
+        io.readSelect(
+            "Pick an event: ",
+            active,
+            event -> "[%d] %s".formatted(event.displayId(), event.name()));
+
+    var event = context.getEvent(pick.eventKey());
+
+    if (event == null) {
+      io.println("That event is no longer available.");
+      return;
+    }
+
+    // TODO: print state
+
+    var option =
+        io.readSelect(
+            "Choose an option: ", event.state().options(), o -> "%s [value %d, %d shares helds]");
+
+    var amount = io.readInt("How many shares? ", 1, Integer.MAX_VALUE);
+
+    try {
+      var receipt = context.buyShares("", option.optionKey(), option.optionKey(), amount);
+    } catch (GuessMarketException e) {
+      io.newLine();
+      io.println("Purchase declined: %s".formatted(e.getMessage()));
+    }
+  }
+}
diff --git a/ui-console/src/main/java/market/guess/ui/console/command/EventDetailsMenuCommand.java b/ui-console/src/main/java/market/guess/ui/console/command/EventDetailsMenuCommand.java
new file mode 100644
index 0000000..e12caeb
--- /dev/null
+++ b/ui-console/src/main/java/market/guess/ui/console/command/EventDetailsMenuCommand.java
@@ -0,0 +1,26 @@
+package market.guess.ui.console.command;
+
+public final class EventDetailsMenuCommand implements MenuCommand {
+
+  @Override
+  public int getIndex() {
+    return 3;
+  }
+
+  @Override
+  public String getName() {
+    return "Show event details";
+  }
+
+  @Override
+  public boolean allowed() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'allowed'");
+  }
+
+  @Override
+  public void execute() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'execute'");
+  }
+}
diff --git a/ui-console/src/main/java/market/guess/ui/console/command/LoadMarketStateMenuCommand.java b/ui-console/src/main/java/market/guess/ui/console/command/LoadMarketStateMenuCommand.java
new file mode 100644
index 0000000..3111044
--- /dev/null
+++ b/ui-console/src/main/java/market/guess/ui/console/command/LoadMarketStateMenuCommand.java
@@ -0,0 +1,26 @@
+package market.guess.ui.console.command;
+
+public final class LoadMarketStateMenuCommand implements MenuCommand {
+
+  @Override
+  public int getIndex() {
+    return 8;
+  }
+
+  @Override
+  public String getName() {
+    return "Load market state";
+  }
+
+  @Override
+  public boolean allowed() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'allowed'");
+  }
+
+  @Override
+  public void execute() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'execute'");
+  }
+}
diff --git a/ui-console/src/main/java/market/guess/ui/console/command/SaveMarketStateMenuCommand.java b/ui-console/src/main/java/market/guess/ui/console/command/SaveMarketStateMenuCommand.java
new file mode 100644
index 0000000..2f950f0
--- /dev/null
+++ b/ui-console/src/main/java/market/guess/ui/console/command/SaveMarketStateMenuCommand.java
@@ -0,0 +1,44 @@
+package market.guess.ui.console.command;
+
+import java.nio.file.Path;
+import market.guess.api.GuessMarketContext;
+import market.guess.ui.console.io.InputProcessor;
+
+public final class SaveMarketStateMenuCommand implements MenuCommand {
+  private final GuessMarketContext context;
+  private final InputProcessor io;
+
+  public SaveMarketStateMenuCommand(GuessMarketContext context, InputProcessor io) {
+    super();
+    this.context = context;
+    this.io = io;
+  }
+
+  @Override
+  public int getIndex() {
+    return 7;
+  }
+
+  @Override
+  public String getName() {
+    return "Save current state";
+  }
+
+  @Override
+  public boolean allowed() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'allowed'");
+  }
+
+  @Override
+  public void execute() {
+    var path = io.readPath("Save to: ");
+
+    try {
+      context.saveState(Path.of(path));
+      io.println("Saved current state to %s.".formatted(path));
+    } catch (Exception e) {
+      io.println("Failed to save: %s".formatted(e.getMessage()));
+    }
+  }
+}
diff --git a/ui-console/src/main/java/market/guess/ui/console/command/SettleEventMenuCommand.java b/ui-console/src/main/java/market/guess/ui/console/command/SettleEventMenuCommand.java
new file mode 100644
index 0000000..9b62be5
--- /dev/null
+++ b/ui-console/src/main/java/market/guess/ui/console/command/SettleEventMenuCommand.java
@@ -0,0 +1,36 @@
+package market.guess.ui.console.command;
+
+import market.guess.api.GuessMarketContext;
+import market.guess.ui.console.io.InputProcessor;
+
+public final class SettleEventMenuCommand implements MenuCommand {
+  private final GuessMarketContext context;
+  private final InputProcessor io;
+
+  public SettleEventMenuCommand(GuessMarketContext context, InputProcessor io) {
+    this.context = context;
+    this.io = io;
+  }
+
+  @Override
+  public int getIndex() {
+    return 5;
+  }
+
+  @Override
+  public String getName() {
+    return "Settle an event";
+  }
+
+  @Override
+  public boolean allowed() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'allowed'");
+  }
+
+  @Override
+  public void execute() {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'execute'");
+  }
+}
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 fc5422f..b6d5405 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
@@ -20,14 +20,20 @@ public final class InputProcessor {
   }
 
   public void splashScreen() {
-    IO.println("<<-- GUESS MARKET -->>");
+    newLine();
+    IO.println("<<- GUESS MARKET ->>");
+  }
+
+  public void printState() {
+    nextLine();
+    println("    Option   |         Value | Shares ");
+
+    newLine();
   }
 
   public String readLine(String prompt) {
     print(prompt);
-    var line = nextLine();
-
-    return line.trim();
+    return nextLine().trim();
   }
 
   public int readInt(String prompt, int min, int max) {