Enhance transaction fetching with pagination support and improved error handling

Signed-off-by: Dmitrii <computer@yawaflua.tech>

Took 22 minutes

src/client/java/git/yawaflua/tech/spmega/client/ui/TransactionHistoryScreen.java

@@ -3,6 +3,7 @@ package git.yawaflua.tech.spmega.client.ui;
 import git.yawaflua.tech.spmega.client.ui.service.BackendAuthenticator;
 import git.yawaflua.tech.spmega.client.ui.service.BankDatabase.LocalTransaction;
 import git.yawaflua.tech.spmega.client.ui.service.BankUiService;
+import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.gui.DrawContext;
 import net.minecraft.client.gui.screen.Screen;
 import net.minecraft.client.gui.widget.ButtonWidget;
@@ -19,6 +20,8 @@ public class TransactionHistoryScreen extends Screen {
     private final List<LocalTransaction> transactions = new ArrayList<>();
     private boolean loading = true;
     private String errorMessage = "";
+    private int scrollOffset = 0;
+    private int currentPage = 1;
 
     public TransactionHistoryScreen(Screen parent, String cardId, String cardTitle) {
         super(Text.literal("История транзакций"));
@@ -36,40 +39,112 @@ public class TransactionHistoryScreen extends Screen {
                 .dimensions(centerX - 60, startY + 10, 120, 20)
                 .build());
 
+        // Scroll Up/Down buttons
+        this.addDrawableChild(ButtonWidget.builder(Text.literal("▲"), button -> scrollUp())
+                .dimensions(centerX + 140, 65, 20, 20)
+                .build());
+
+        this.addDrawableChild(ButtonWidget.builder(Text.literal("▼"), button -> scrollDown())
+                .dimensions(centerX + 140, 155, 20, 20)
+                .build());
+
+        // Prev Page button
+        this.addDrawableChild(ButtonWidget.builder(Text.literal("<"), button -> {
+            if (currentPage > 1) {
+                currentPage--;
+                scrollOffset = 0;
+                loadTransactions();
+            }
+        }).dimensions(centerX - 100, startY - 15, 30, 20).build());
+
+        // Next Page button
+        this.addDrawableChild(ButtonWidget.builder(Text.literal(">"), button -> {
+            currentPage++;
+            scrollOffset = 0;
+            loadTransactions();
+        }).dimensions(centerX + 70, startY - 15, 30, 20).build());
+
         loadTransactions();
     }
 
+    private void scrollUp() {
+        if (scrollOffset > 0) {
+            scrollOffset--;
+        }
+    }
+
+    private void scrollDown() {
+        if (scrollOffset < Math.max(0, transactions.size() - 6)) {
+            scrollOffset++;
+        }
+    }
+
+    // Support pre-1.20.2 mouse scroll
+    public boolean mouseScrolled(double mouseX, double mouseY, double amount) {
+        if (amount > 0) {
+            scrollUp();
+        } else if (amount < 0) {
+            scrollDown();
+        }
+        return true;
+    }
+
+    // Support 1.20.2+ mouse scroll
+    @Override
+    public boolean mouseScrolled(double mouseX, double mouseY, double horizontalAmount, double verticalAmount) {
+        if (verticalAmount > 0) {
+            scrollUp();
+        } else if (verticalAmount < 0) {
+            scrollDown();
+        }
+        return true;
+    }
+
     private void loadTransactions() {
         loading = true;
         errorMessage = "";
         transactions.clear();
 
+        UiNotifications.instance().show(Text.literal("Загрузка..."));
+
         CompletableFuture.runAsync(() -> {
             try {
+                System.out.println("[SPMEGA] Transaction history loading started for card: " + cardId + ", page: " + currentPage);
                 List<LocalTransaction> list = null;
                 git.yawaflua.tech.spmega.ModConfig config = git.yawaflua.tech.spmega.SPMega.getConfig();
                 if (config != null && config.allowBackend()) {
                     try {
-                        list = BackendAuthenticator.fetchTransactionsFromBackend(cardId);
+                        list = BackendAuthenticator.fetchTransactionsFromBackend(cardId, currentPage);
+                        System.out.println("[SPMEGA] Fetched " + (list != null ? list.size() : "null") + " transactions from backend.");
                     } catch (Exception e) {
                         System.err.println("[SPMEGA] Failed to fetch transactions from server, falling back to DB: " + e.getMessage());
+                        e.printStackTrace();
                     }
                 }
 
                 if (list == null) {
                     list = BankUiService.instance().getDatabase().loadTransferHistory(cardId);
+                    System.out.println("[SPMEGA] Loaded " + (list != null ? list.size() : "null") + " transactions from database.");
                 }
 
-                List<LocalTransaction> finalList = list;
-                if (this.client != null) {
-                    this.client.execute(() -> {
+                List<LocalTransaction> finalList = list != null ? list : new ArrayList<>();
+                MinecraftClient minecraftClient = MinecraftClient.getInstance();
+                if (minecraftClient != null) {
+                    minecraftClient.execute(() -> {
+                        System.out.println("[SPMEGA] Setting transactions list on main thread. Count: " + finalList.size());
                         this.transactions.addAll(finalList);
+                        this.scrollOffset = 0;
                         this.loading = false;
                     });
+                } else {
+                    System.out.println("[SPMEGA] MinecraftClient.getInstance() is null in loadTransactions callback!");
                 }
             } catch (Exception e) {
-                if (this.client != null) {
-                    this.client.execute(() -> {
+                System.err.println("[SPMEGA] Outer exception in loadTransactions: " + e.getMessage());
+                e.printStackTrace();
+                MinecraftClient minecraftClient = MinecraftClient.getInstance();
+                if (minecraftClient != null) {
+                    minecraftClient.execute(() -> {
                         this.errorMessage = e.getMessage();
                         this.loading = false;
                     });
@@ -91,30 +166,38 @@ public class TransactionHistoryScreen extends Screen {
 
         int centerX = this.width / 2;
         int startY = 50;
+        int bottomStartY = this.height / 2 + 50;
 
-        context.drawCenteredTextWithShadow(this.textRenderer, this.title, centerX, 20, 0xFFFFFF);
-        context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Карта: " + cardTitle), centerX, 35, 0xBFBFBF);
+        context.drawCenteredTextWithShadow(this.textRenderer, this.title, centerX, 20, 0xFFFFFFFF);
+        context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Карта: " + cardTitle), centerX, 35, 0xFFBFBFBF);
+        context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Стр. " + currentPage), centerX, bottomStartY - 9, 0xFFFFFFFF);
 
         if (loading) {
-            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Загрузка транзакций..."), centerX, this.height / 2 - 10, 0xCCCCCC);
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Загрузка транзакций..."), centerX, this.height / 2 - 10, 0xFFCCCCCC);
         } else if (!errorMessage.isEmpty()) {
-            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Ошибка: " + errorMessage), centerX, this.height / 2 - 10, 0xFF5555);
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Ошибка: " + errorMessage), centerX, this.height / 2 - 10, 0xFFFF5555);
         } else if (transactions.isEmpty()) {
-            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Транзакций не найдено"), centerX, this.height / 2 - 10, 0xCCCCCC);
+            context.drawCenteredTextWithShadow(this.textRenderer, Text.literal("Транзакций не найдено"), centerX, this.height / 2 - 10, 0xFFCCCCCC);
         } else {
             int y = startY + 15;
-            for (int i = 0; i < Math.min(6, transactions.size()); i++) {
-                LocalTransaction tx = transactions.get(i);
+            int limit = Math.min(6, transactions.size() - scrollOffset);
+            for (int i = 0; i < limit; i++) {
+                LocalTransaction tx = transactions.get(scrollOffset + i);
 
                 String amountText = tx.amount() + " АР";
                 String dateText = tx.createdAt();
+                if (dateText == null) {
+                    dateText = "";
+                }
                 if (dateText.length() > 19) {
                     dateText = dateText.substring(0, 19).replace("T", " ");
                 }
                 String commentText = tx.comment().isEmpty() ? "" : " (" + tx.comment() + ")";
 
                 String line = String.format("%s -> %s | %s%s", dateText, tx.receiver(), amountText, commentText);
-                int color = tx.status().equalsIgnoreCase("SUCCESS") ? 0x55FF55 : 0xFF5555;
+
+                String status = tx.status();
+                int color = (status != null && status.equalsIgnoreCase("SUCCESS")) ? 0xFF55FF55 : 0xFFFF5555;
 
                 context.drawCenteredTextWithShadow(this.textRenderer, Text.literal(line), centerX, y, color);
                 y += 18;

src/client/java/git/yawaflua/tech/spmega/client/ui/service/BackendAuthenticator.java

@@ -1,5 +1,6 @@
 package git.yawaflua.tech.spmega.client.ui.service;
 
+import com.google.gson.JsonElement;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import com.mojang.authlib.exceptions.AuthenticationException;
@@ -314,9 +315,11 @@ public class BackendAuthenticator {
         return true;
     }
 
-    public static List<BankDatabase.LocalTransaction> fetchTransactionsFromBackend(String cardId) throws IOException, InterruptedException {
+    public static List<BankDatabase.LocalTransaction> fetchTransactionsFromBackend(String cardId, int page) throws IOException, InterruptedException {
+        System.out.println("[SPMEGA] fetchTransactionsFromBackend called for cardId: " + cardId + ", page: " + page);
         ModConfig config = SPMega.getConfig();
         if (config == null || !config.allowBackend()) {
+            System.out.println("[SPMEGA] fetchTransactionsFromBackend aborted: config is null or backend not allowed.");
             return List.of();
         }
 
@@ -328,7 +331,8 @@ public class BackendAuthenticator {
             apiDomain = apiDomain.substring(0, apiDomain.length() - 1);
         }
 
-        String url = apiDomain + "/api/v1/transactions?cardId=" + cardId;
+        String url = apiDomain + "/api/v1/transactions?p=" + page;
+        System.out.println("[SPMEGA] Requesting transactions from URL: " + url);
 
         HttpClient httpClient = HttpClient.newHttpClient();
         HttpRequest request = HttpRequest.newBuilder(URI.create(url))
@@ -338,22 +342,85 @@ public class BackendAuthenticator {
                 .build();
 
         HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+        System.out.println("[SPMEGA] Response status code: " + response.statusCode());
         if (response.statusCode() != 200) {
+            System.err.println("[SPMEGA] Failed response body: " + response.body());
             throw new IOException("Server returned status code " + response.statusCode() + " on fetch transactions.");
         }
 
-        com.google.gson.JsonArray transactionsArray = JsonParser.parseString(response.body()).getAsJsonArray();
+        String body = response.body();
+        System.out.println("[SPMEGA] Response body: " + (body.length() > 500 ? body.substring(0, 500) + "..." : body));
+
+        JsonElement parsed = JsonParser.parseString(body);
+        com.google.gson.JsonArray transactionsArray = null;
+
+        if (parsed.isJsonArray()) {
+            transactionsArray = parsed.getAsJsonArray();
+        } else if (parsed.isJsonObject()) {
+            JsonObject obj = parsed.getAsJsonObject();
+            if (obj.has("$values") && obj.get("$values").isJsonArray()) {
+                transactionsArray = obj.getAsJsonArray("$values");
+            } else if (obj.has("transactions") && obj.get("transactions").isJsonArray()) {
+                transactionsArray = obj.getAsJsonArray("transactions");
+            } else if (obj.has("values") && obj.get("values").isJsonArray()) {
+                transactionsArray = obj.getAsJsonArray("values");
+            }
+        }
+
+        if (transactionsArray == null) {
+            System.err.println("[SPMEGA] Response body is not a JSON array or wrapped array: " + body);
+            return List.of();
+        }
+
+        System.out.println("[SPMEGA] Total transactions returned from server: " + transactionsArray.size());
         List<BankDatabase.LocalTransaction> list = new ArrayList<>();
         for (com.google.gson.JsonElement el : transactionsArray) {
-            JsonObject json = el.getAsJsonObject();
-            String receiver = json.has("receiver") ? json.get("receiver").getAsString() : (json.has("recipient") ? json.get("recipient").getAsString() : "unknown");
-            long amount = json.has("amount") ? json.get("amount").getAsLong() : 0L;
-            String comment = json.has("comment") && !json.get("comment").isJsonNull() ? json.get("comment").getAsString() : "";
-            String status = json.has("status") ? json.get("status").getAsString() : "SUCCESS";
-            String createdAt = json.has("createdAt") ? json.get("createdAt").getAsString() : (json.has("created_at") ? json.get("created_at").getAsString() : "");
+            try {
+                JsonObject json = el.getAsJsonObject();
 
-            list.add(new BankDatabase.LocalTransaction(receiver, amount, comment, status, createdAt));
+                // Check cardId filter
+                String senderCardNumber = "";
+                if (json.has("senderCardNumber") && !json.get("senderCardNumber").isJsonNull()) {
+                    senderCardNumber = json.get("senderCardNumber").getAsString();
+                }
+
+                if (!senderCardNumber.equalsIgnoreCase(cardId)) {
+                    continue;
+                }
+
+                String receiver = "unknown";
+                if (json.has("receiver") && !json.get("receiver").isJsonNull()) {
+                    receiver = json.get("receiver").getAsString();
+                } else if (json.has("receiverName") && !json.get("receiverName").isJsonNull()) {
+                    receiver = json.get("receiverName").getAsString();
+                } else if (json.has("receiverCardNumber") && !json.get("receiverCardNumber").isJsonNull()) {
+                    receiver = json.get("receiverCardNumber").getAsString();
+                } else if (json.has("recipient") && !json.get("recipient").isJsonNull()) {
+                    receiver = json.get("recipient").getAsString();
+                }
+
+                long amount = json.has("amount") ? json.get("amount").getAsLong() : 0L;
+                String comment = json.has("comment") && !json.get("comment").isJsonNull() ? json.get("comment").getAsString() : "";
+                String status = json.has("status") && !json.get("status").isJsonNull() ? json.get("status").getAsString() : "SUCCESS";
+
+                String createdAt = "";
+                if (json.has("transactionDate") && !json.get("transactionDate").isJsonNull()) {
+                    createdAt = json.get("transactionDate").getAsString();
+                } else if (json.has("createdAt") && !json.get("createdAt").isJsonNull()) {
+                    createdAt = json.get("createdAt").getAsString();
+                } else if (json.has("created_at") && !json.get("created_at").isJsonNull()) {
+                    createdAt = json.get("created_at").getAsString();
+                }
+
+                System.out.printf("[SPMEGA] Parsed transaction: %s -> %s, amount=%d, comment=%s, status=%s%n",
+                        createdAt, receiver, amount, comment, status);
+
+                list.add(new BankDatabase.LocalTransaction(receiver, amount, comment, status, createdAt));
+            } catch (Exception parseEx) {
+                System.err.println("[SPMEGA] Error parsing transaction element: " + parseEx.getMessage());
+            }
         }
+        System.out.println("[SPMEGA] Returning " + list.size() + " filtered transactions for card " + cardId);
         return list;
     }
 }