Move I/O provider abstraction to ui-console, add ledger/account/problem DTOs

InputProvider/OutputProvider were api-layer types only ever implemented
by the console UI; relocate them there. Drop the unused
GuessMarketEngine/LocalGuessMarketService pair, flesh out LoadResultDTO
with success/failure variants, and make LocalGuessMarketContext.LoadAsync
report real outcomes instead of an empty placeholder.

11 files changed, 37 insertions, 32 deletions

diff --git a/api/src/main/java/market/guess/InputProvider.java b/api/src/main/java/market/guess/InputProvider.java
deleted file mode 100644
index be7372b..0000000
--- a/api/src/main/java/market/guess/InputProvider.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package market.guess;
-
-public interface InputProvider extends AutoCloseable {
-  int nextInt();
-}
diff --git a/api/src/main/java/market/guess/InputProviderFactory.java b/api/src/main/java/market/guess/InputProviderFactory.java
deleted file mode 100644
index 6801103..0000000
--- a/api/src/main/java/market/guess/InputProviderFactory.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package market.guess;
-
-public interface InputProviderFactory {
-  InputProvider create();
-}
diff --git a/api/src/main/java/market/guess/OutputProvider.java b/api/src/main/java/market/guess/OutputProvider.java
deleted file mode 100644
index 774408e..0000000
--- a/api/src/main/java/market/guess/OutputProvider.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package market.guess;
-
-public interface OutputProvider {
-  void print(Object object);
-
-  void println(Object object);
-}
diff --git a/api/src/main/java/market/guess/OutputProviderFactory.java b/api/src/main/java/market/guess/OutputProviderFactory.java
deleted file mode 100644
index b4eb7f5..0000000
--- a/api/src/main/java/market/guess/OutputProviderFactory.java
+++ /dev/null
@@ -1,5 +0,0 @@
-package market.guess;
-
-public interface OutputProviderFactory {
-  OutputProvider create();
-}
diff --git a/api/src/main/java/market/guess/api/AccountDTO.java b/api/src/main/java/market/guess/api/AccountDTO.java
new file mode 100644
index 0000000..8e7123e
--- /dev/null
+++ b/api/src/main/java/market/guess/api/AccountDTO.java
@@ -0,0 +1,6 @@
+package market.guess.api;
+
+import java.util.List;
+
+public record AccountDTO(
+    String owner, String balance, boolean blocked, List<LedgerEntryDTO> entries) {}
diff --git a/api/src/main/java/market/guess/api/GuessMarketContext.java b/api/src/main/java/market/guess/api/GuessMarketContext.java
index 12ffbeb..2d7af4c 100644
--- a/api/src/main/java/market/guess/api/GuessMarketContext.java
+++ b/api/src/main/java/market/guess/api/GuessMarketContext.java
@@ -1,10 +1,9 @@
 package market.guess.api;
 
 import java.util.List;
-import java.util.concurrent.CompletableFuture;
 
 public interface GuessMarketContext {
-  CompletableFuture<LoadResultDTO> LoadAsync();
+  LoadResultDTO LoadAsync();
 
   void SaveChangesAsync();
 
diff --git a/api/src/main/java/market/guess/api/GuessMarketEngine.java b/api/src/main/java/market/guess/api/GuessMarketEngine.java
deleted file mode 100644
index b6d44a4..0000000
--- a/api/src/main/java/market/guess/api/GuessMarketEngine.java
+++ /dev/null
@@ -1,7 +0,0 @@
-package market.guess.api;
-
-import java.util.concurrent.CompletableFuture;
-
-public interface GuessMarketEngine {
-  CompletableFuture<LoadResultDTO> loadEvents();
-}
diff --git a/api/src/main/java/market/guess/api/LedgerEntryDTO.java b/api/src/main/java/market/guess/api/LedgerEntryDTO.java
new file mode 100644
index 0000000..b8f994c
--- /dev/null
+++ b/api/src/main/java/market/guess/api/LedgerEntryDTO.java
@@ -0,0 +1,4 @@
+package market.guess.api;
+
+public record LedgerEntryDTO(
+    long seq, String at, LedgerType type, String amount, String balanceAfter, String note) {}
diff --git a/api/src/main/java/market/guess/api/LedgerType.java b/api/src/main/java/market/guess/api/LedgerType.java
new file mode 100644
index 0000000..3402b84
--- /dev/null
+++ b/api/src/main/java/market/guess/api/LedgerType.java
@@ -0,0 +1,10 @@
+package market.guess.api;
+
+public enum LedgerType {
+  SUBSIDY,
+  PURCHASE,
+  COMMISSION,
+  PAYOUT,
+  REFUND,
+  DEPOSIT
+}
diff --git a/api/src/main/java/market/guess/api/LoadResultDTO.java b/api/src/main/java/market/guess/api/LoadResultDTO.java
index cf3630b..8cae3c0 100644
--- a/api/src/main/java/market/guess/api/LoadResultDTO.java
+++ b/api/src/main/java/market/guess/api/LoadResultDTO.java
@@ -1,3 +1,15 @@
 package market.guess.api;
 
-public record LoadResultDTO() {}
+import java.util.List;
+
+public record LoadResultDTO(
+    boolean success, String source, int eventsLoaded, List<ProblemDTO> issues) {
+
+  public static LoadResultDTO success(String sourceLabel, int eventsLoaded) {
+    return new LoadResultDTO(true, sourceLabel, eventsLoaded, List.of());
+  }
+
+  public static LoadResultDTO failure(String sourceLabel, List<ProblemDTO> problems) {
+    return new LoadResultDTO(false, sourceLabel, 0, List.copyOf(problems));
+  }
+}
diff --git a/api/src/main/java/market/guess/api/ProblemDTO.java b/api/src/main/java/market/guess/api/ProblemDTO.java
new file mode 100644
index 0000000..682372b
--- /dev/null
+++ b/api/src/main/java/market/guess/api/ProblemDTO.java
@@ -0,0 +1,3 @@
+package market.guess.api;
+
+public record ProblemDTO(String code, String humanizedMessage, String location) {}