From 02deb7774db807f05eba4fe483de53ddd44588b2 Mon Sep 17 00:00:00 2001
From: Kostya <mail@sartin.in>
Date: Fri, 14 Aug 2026 08:33:23 +0000
Subject: Implement LMSR mechanism and Event/Account accessors, wire
 EventMapperV1

Adds LmsrTradingMechanism, exposes Event/Account getters plus
Event.toEventSummary() for DTO conversion, and implements
EventMapperV1.toDomain() to build Event from the legacy XML model.
---
 .../java/market/guess/service/domain/Account.java  |  4 +
 .../java/market/guess/service/domain/Event.java    | 95 ++++++++++++++++++++++
 .../infrastructure/mapper/EventMapperV1.java       | 43 +++++++++-
 .../service/mechanism/LmsrTradingMechanism.java    | 36 ++++++++
 4 files changed, 176 insertions(+), 2 deletions(-)
 create mode 100644 service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java

(limited to 'service/src')

diff --git a/service/src/main/java/market/guess/service/domain/Account.java b/service/src/main/java/market/guess/service/domain/Account.java
index e350400..274260e 100644
--- a/service/src/main/java/market/guess/service/domain/Account.java
+++ b/service/src/main/java/market/guess/service/domain/Account.java
@@ -24,4 +24,8 @@ public final class Account {
     this.balance = BigDecimalOptions.toMoney(initialBalance);
     this.clock = clock;
   }
+
+  public BigDecimal getBalance() {
+    return balance;
+  }
 }
diff --git a/service/src/main/java/market/guess/service/domain/Event.java b/service/src/main/java/market/guess/service/domain/Event.java
index 4c33928..383126f 100644
--- a/service/src/main/java/market/guess/service/domain/Event.java
+++ b/service/src/main/java/market/guess/service/domain/Event.java
@@ -5,6 +5,7 @@ import java.util.ArrayList;
 import java.util.List;
 import market.guess.api.CommissionTiming;
 import market.guess.api.EventStatus;
+import market.guess.api.EventSummaryDTO;
 import market.guess.service.mechanism.TradingMechanism;
 
 public final class Event {
@@ -48,4 +49,98 @@ public final class Event {
     this.account = new Account(AccountType.EVENT, eventKey, BigDecimalOptions.ZERO_MONEY);
     this.status = status;
   }
+
+  public String getEventKey() {
+    return eventKey;
+  }
+
+  public int getDisplayId() {
+    return displayId;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public String getDescription() {
+    return description;
+  }
+
+  public int getCommissionPercent() {
+    return commissionPercent;
+  }
+
+  public CommissionTiming getCommissionTiming() {
+    return commissionTiming;
+  }
+
+  public TradingMechanism getMechanism() {
+    return mechanism;
+  }
+
+  public List<Option> getOptions() {
+    return options;
+  }
+
+  public List<String> getOptionsNames() {
+    return options.stream().map(Option::getName).toList();
+  }
+
+  public Account getAccount() {
+    return account;
+  }
+
+  public String getMarketMaker() {
+    return marketMaker;
+  }
+
+  public List<Trade> getTrades() {
+    return trades;
+  }
+
+  public EventStatus getStatus() {
+    return status;
+  }
+
+  public void setStatus(EventStatus status) {
+    this.status = status;
+  }
+
+  public String getWinningOptionKey() {
+    return winningOptionKey;
+  }
+
+  public void setWinningOptionKey(String winningOptionKey) {
+    this.winningOptionKey = winningOptionKey;
+  }
+
+  public long getNextTradeSeq() {
+    return nextTradeSeq;
+  }
+
+  public void setNextTradeSeq(long nextTradeSeq) {
+    this.nextTradeSeq = nextTradeSeq;
+  }
+
+  public BigDecimal getSettlementCommission() {
+    return settlementCommission;
+  }
+
+  public void setSettlementCommission(BigDecimal settlementCommission) {
+    this.settlementCommission = settlementCommission;
+  }
+
+  public EventSummaryDTO toEventSummary() {
+    return new EventSummaryDTO(
+        eventKey,
+        displayId,
+        name,
+        description,
+        commissionPercent,
+        commissionTiming,
+        mechanism.type(),
+        status,
+        getOptionsNames(),
+        account.getBalance().toPlainString());
+  }
 }
diff --git a/service/src/main/java/market/guess/service/infrastructure/mapper/EventMapperV1.java b/service/src/main/java/market/guess/service/infrastructure/mapper/EventMapperV1.java
index dadbae6..33c38e3 100644
--- a/service/src/main/java/market/guess/service/infrastructure/mapper/EventMapperV1.java
+++ b/service/src/main/java/market/guess/service/infrastructure/mapper/EventMapperV1.java
@@ -1,13 +1,52 @@
 package market.guess.service.infrastructure.mapper;
 
+import java.util.ArrayList;
+import java.util.List;
+import market.guess.api.CommissionTiming;
+import market.guess.api.EventStatus;
 import market.guess.service.domain.Event;
+import market.guess.service.domain.Option;
+import market.guess.service.mechanism.LmsrTradingMechanism;
 import market.guess.service.model.v1.GMEvent;
 
 public final class EventMapperV1 implements Mapper<Event, GMEvent> {
 
   @Override
   public Event toDomain(GMEvent source) {
-    // TODO Auto-generated method stub
-    throw new UnsupportedOperationException("Unimplemented method 'toDomain'");
+    return new Event(
+        getEventKey(source),
+        source.getId(),
+        joinName(source.getName()),
+        source.getDescription(),
+        source.getComision().getValue(),
+        getTiming(source.getComision().getType()),
+        new LmsrTradingMechanism(source.getGMMethod().getGMLMSR().getB()),
+        EventStatus.ACTIVE,
+        getOptions(source),
+        "");
+  }
+
+  private static String getEventKey(GMEvent event) {
+    return String.valueOf(event.getId());
+  }
+
+  private static String joinName(List<String> tokens) {
+    return tokens == null ? "" : String.join(" ", tokens);
+  }
+
+  private static CommissionTiming getTiming(String type) throws IllegalArgumentException {
+    return switch (type) {
+      case "on-close" -> CommissionTiming.ON_CLOSE;
+      case "on-purchase" -> CommissionTiming.ON_PURCHASE;
+      default -> throw new IllegalArgumentException("Unknown comision type: " + type);
+    };
+  }
+
+  private static List<Option> getOptions(GMEvent x) {
+    var ret = new ArrayList<Option>(x.getGMOptions().getGMOption().size());
+    for (var i = 0; i < x.getGMOptions().getGMOption().size(); i++) {
+      ret.add(new Option(getEventKey(x) + ":" + i, x.getGMOptions().getGMOption().get(i)));
+    }
+    return ret;
   }
 }
diff --git a/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java b/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java
new file mode 100644
index 0000000..02a63df
--- /dev/null
+++ b/service/src/main/java/market/guess/service/mechanism/LmsrTradingMechanism.java
@@ -0,0 +1,36 @@
+package market.guess.service.mechanism;
+
+import java.math.BigDecimal;
+import market.guess.api.MechanismType;
+
+public final class LmsrTradingMechanism implements TradingMechanism {
+  private final int liquidity;
+
+  public LmsrTradingMechanism(int liquidity) {
+    super();
+    this.liquidity = liquidity;
+  }
+
+  @Override
+  public MechanismType type() {
+    return MechanismType.LMSR;
+  }
+
+  @Override
+  public BigDecimal openingCost(int optionCount) {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'openingCost'");
+  }
+
+  @Override
+  public BigDecimal costOfBuying(long[] q, int optionIndex, long quantity) {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'costOfBuying'");
+  }
+
+  @Override
+  public double[] prices(long[] q) {
+    // TODO Auto-generated method stub
+    throw new UnsupportedOperationException("Unimplemented method 'prices'");
+  }
+}
-- 
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