[chusan] Implement GetUserFavoriteItemHandler

docs/dev/chusan_dev_notes.md

@@ -30,5 +30,13 @@
 - Can be disabled dynamically on GetGameSettingHandler
 - NAT hole punching, direct connection between cab to cab?
 - Session management required
-- Fallback to CPU competitors if conditions met
-- ReflectorUri, Related?
+- Fill player slots with CPU competitors if at least two player exist in a room
+- ReflectorUri, Related?
+
+## User favorite kind types
+| Kind |    Name     |           Notes            |
+|------|-------------|----------------------------|
+|  1   |  Music      |                            |
+|  2   |  Rival      | Query ID to Rival Handlers |
+|  3   |  Character  |                            |
+|  4   |  Unknown    |                            |

src/main/java/icu/samnyan/aqua/sega/chusan/handler/impl/GetUserFavoriteItemHandler.java

@@ -2,44 +2,86 @@ package icu.samnyan.aqua.sega.chusan.handler.impl;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
 import icu.samnyan.aqua.sega.chusan.handler.BaseHandler;
+import icu.samnyan.aqua.sega.chusan.model.response.data.UserFavorite;
+import icu.samnyan.aqua.sega.chusan.model.userdata.UserGeneralData;
+import icu.samnyan.aqua.sega.chusan.service.UserGeneralDataService;
 import icu.samnyan.aqua.sega.util.jackson.StringMapper;
+
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
 import java.util.LinkedHashMap;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
-
-/**
- * Handle GetUserFavoriteItem request
- * @author yueou (yueou.xu@gmail.com)
- */
+import java.util.Optional;
 
 @Component("ChusanGetUserFavoriteItemHandler")
-public class GetUserFavoriteItemHandler  implements BaseHandler {
+public class GetUserFavoriteItemHandler implements BaseHandler {
 
     private static final Logger logger = LoggerFactory.getLogger(GetUserFavoriteItemHandler.class);
 
     private final StringMapper mapper;
 
+    private final UserGeneralDataService userGeneralDataService;
+
     @Autowired
-    public GetUserFavoriteItemHandler(StringMapper mapper) {
+    public GetUserFavoriteItemHandler(StringMapper mapper, UserGeneralDataService userGeneralDataService) {
         this.mapper = mapper;
+        this.userGeneralDataService = userGeneralDataService;
     }
 
     @Override
     public String handle(Map<String, Object> request) throws JsonProcessingException {
         String userId = (String) request.get("userId");
-        String kind = (String) request.get("kind");
+        int kind = Integer.parseInt((String) request.get("kind"));
+        Long nextIndexVal = Long.parseLong((String) request.get("nextIndex"));
+        int maxCount = Integer.parseInt((String) request.get("maxCount")); // Fixed to 50?
 
+        List<UserFavorite> userFavorites = new LinkedList<>();
+        Optional<UserGeneralData> favOptional;
+
+        switch (kind) {
+            case 1: // Music
+            favOptional = userGeneralDataService.getByUserIdAndKey(userId, "favorite_music");
+            break;
+
+            case 3: // Chara
+            favOptional = userGeneralDataService.getByUserIdAndKey(userId, "favorite_chara");
+            break;
+
+            default:
+            favOptional = Optional.empty();
+            break;
+        }
+
+        // Let's assume data is in following format:
+        // 1111,2222,3333,4444 ...
+        if(favOptional.isPresent()) {
+            String val = favOptional.get().getPropertyValue();
+            if(StringUtils.isNotBlank(val) && val.contains(",")) {
+                String[] records = val.split(",");
+                for (String record : records) {
+                    userFavorites.add(new UserFavorite(Integer.parseInt(record)));
+                }
+            }
+        }
+
+        // While client seems capable to handle more than 50 items, let's limit it to 50
+        // Reasons: 1. VARCHAR is limited to 255 chars (theoretically <= 51 entries), 2. Multiple pagination is troublesome
+        if (userFavorites.size() > 50) {
+            userFavorites = userFavorites.subList(0, 50);
+        }
+        
         Map<String, Object> resultMap = new LinkedHashMap<>();
         resultMap.put("userId", userId);
-        resultMap.put("length", 0);
         resultMap.put("kind", kind);
+        resultMap.put("length", userFavorites.size());
         resultMap.put("nextIndex", -1);
-        resultMap.put("userFavoriteItemList", List.of());
+        resultMap.put("userFavoriteItemList", userFavorites);
 
         String json = mapper.write(resultMap);
         logger.info("Response: " + json);

src/main/java/icu/samnyan/aqua/sega/chusan/model/response/data/UserFavorite.java

@@ -0,0 +1,17 @@
+package icu.samnyan.aqua.sega.chusan.model.response.data;
+
+import lombok.AllArgsConstructor;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+@Data
+@AllArgsConstructor
+@NoArgsConstructor
+public class UserFavorite {
+
+    private int id;
+    
+}