feat: add ability to buy resin with primogems (#2104)

* feat: add ability to buy resin with primogems

* ResinManager#buy returns RetCode value

src/generated/main/java/emu/grasscutter/net/proto/BuyResinReqOuterClass.java

@@ -0,0 +1,475 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: BuyResinReq.proto
+
+package emu.grasscutter.net.proto;
+
+public final class BuyResinReqOuterClass {
+  private BuyResinReqOuterClass() {}
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistryLite registry) {
+  }
+
+  public static void registerAllExtensions(
+      com.google.protobuf.ExtensionRegistry registry) {
+    registerAllExtensions(
+        (com.google.protobuf.ExtensionRegistryLite) registry);
+  }
+  public interface BuyResinReqOrBuilder extends
+      // @@protoc_insertion_point(interface_extends:BuyResinReq)
+      com.google.protobuf.MessageOrBuilder {
+  }
+  /**
+   * <pre>
+   * Name: NIBFJEFHMIM
+   * CmdId: 630
+   * </pre>
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+   */
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+  private static final long serialVersionUID = 0L;
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+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
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+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
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+        throws java.io.IOException {
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+          .parseWithIOException(PARSER, input);
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+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
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+    /**
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+     * Name: NIBFJEFHMIM
+     * CmdId: 630
+     * </pre>
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+     * Protobuf type {@code BuyResinReq}
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+        // @@protoc_insertion_point(builder_implements:BuyResinReq)
+        emu.grasscutter.net.proto.BuyResinReqOuterClass.BuyResinReqOrBuilder {
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src/generated/main/java/emu/grasscutter/net/proto/BuyResinRspOuterClass.java

@@ -0,0 +1,616 @@
+// Generated by the protocol buffer compiler.  DO NOT EDIT!
+// source: BuyResinRsp.proto
+
+package emu.grasscutter.net.proto;
+
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+      com.google.protobuf.ExtensionRegistryLite registry) {
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+
+  public static void registerAllExtensions(
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+   * Name: PFLBPGOHFKJ
+   * CmdId: 687
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+      if (obj == this) {
+       return true;
+      }
+      if (!(obj instanceof emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp)) {
+        return super.equals(obj);
+      }
+      emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp other = (emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp) obj;
+
+      if (getRetcode()
+          != other.getRetcode()) return false;
+      if (getCurValue()
+          != other.getCurValue()) return false;
+      if (!unknownFields.equals(other.unknownFields)) return false;
+      return true;
+    }
+
+    @java.lang.Override
+    public int hashCode() {
+      if (memoizedHashCode != 0) {
+        return memoizedHashCode;
+      }
+      int hash = 41;
+      hash = (19 * hash) + getDescriptor().hashCode();
+      hash = (37 * hash) + RETCODE_FIELD_NUMBER;
+      hash = (53 * hash) + getRetcode();
+      hash = (37 * hash) + CUR_VALUE_FIELD_NUMBER;
+      hash = (53 * hash) + getCurValue();
+      hash = (29 * hash) + unknownFields.hashCode();
+      memoizedHashCode = hash;
+      return hash;
+    }
+
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        java.nio.ByteBuffer data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        java.nio.ByteBuffer data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        com.google.protobuf.ByteString data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        com.google.protobuf.ByteString data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(byte[] data)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        byte[] data,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws com.google.protobuf.InvalidProtocolBufferException {
+      return PARSER.parseFrom(data, extensionRegistry);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseDelimitedFrom(java.io.InputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseDelimitedFrom(
+        java.io.InputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseDelimitedWithIOException(PARSER, input, extensionRegistry);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        com.google.protobuf.CodedInputStream input)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input);
+    }
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parseFrom(
+        com.google.protobuf.CodedInputStream input,
+        com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+        throws java.io.IOException {
+      return com.google.protobuf.GeneratedMessageV3
+          .parseWithIOException(PARSER, input, extensionRegistry);
+    }
+
+    @java.lang.Override
+    public Builder newBuilderForType() { return newBuilder(); }
+    public static Builder newBuilder() {
+      return DEFAULT_INSTANCE.toBuilder();
+    }
+    public static Builder newBuilder(emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp prototype) {
+      return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
+    }
+    @java.lang.Override
+    public Builder toBuilder() {
+      return this == DEFAULT_INSTANCE
+          ? new Builder() : new Builder().mergeFrom(this);
+    }
+
+    @java.lang.Override
+    protected Builder newBuilderForType(
+        com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+      Builder builder = new Builder(parent);
+      return builder;
+    }
+    /**
+     * <pre>
+     * Name: PFLBPGOHFKJ
+     * CmdId: 687
+     * </pre>
+     *
+     * Protobuf type {@code BuyResinRsp}
+     */
+    public static final class Builder extends
+        com.google.protobuf.GeneratedMessageV3.Builder<Builder> implements
+        // @@protoc_insertion_point(builder_implements:BuyResinRsp)
+        emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRspOrBuilder {
+      public static final com.google.protobuf.Descriptors.Descriptor
+          getDescriptor() {
+        return emu.grasscutter.net.proto.BuyResinRspOuterClass.internal_static_BuyResinRsp_descriptor;
+      }
+
+      @java.lang.Override
+      protected com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+          internalGetFieldAccessorTable() {
+        return emu.grasscutter.net.proto.BuyResinRspOuterClass.internal_static_BuyResinRsp_fieldAccessorTable
+            .ensureFieldAccessorsInitialized(
+                emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp.class, emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp.Builder.class);
+      }
+
+      // Construct using emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp.newBuilder()
+      private Builder() {
+        maybeForceBuilderInitialization();
+      }
+
+      private Builder(
+          com.google.protobuf.GeneratedMessageV3.BuilderParent parent) {
+        super(parent);
+        maybeForceBuilderInitialization();
+      }
+      private void maybeForceBuilderInitialization() {
+        if (com.google.protobuf.GeneratedMessageV3
+                .alwaysUseFieldBuilders) {
+        }
+      }
+      @java.lang.Override
+      public Builder clear() {
+        super.clear();
+        retcode_ = 0;
+
+        curValue_ = 0;
+
+        return this;
+      }
+
+      @java.lang.Override
+      public com.google.protobuf.Descriptors.Descriptor
+          getDescriptorForType() {
+        return emu.grasscutter.net.proto.BuyResinRspOuterClass.internal_static_BuyResinRsp_descriptor;
+      }
+
+      @java.lang.Override
+      public emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp getDefaultInstanceForType() {
+        return emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp.getDefaultInstance();
+      }
+
+      @java.lang.Override
+      public emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp build() {
+        emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp result = buildPartial();
+        if (!result.isInitialized()) {
+          throw newUninitializedMessageException(result);
+        }
+        return result;
+      }
+
+      @java.lang.Override
+      public emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp buildPartial() {
+        emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp result = new emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp(this);
+        result.retcode_ = retcode_;
+        result.curValue_ = curValue_;
+        onBuilt();
+        return result;
+      }
+
+      @java.lang.Override
+      public Builder clone() {
+        return super.clone();
+      }
+      @java.lang.Override
+      public Builder setField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.setField(field, value);
+      }
+      @java.lang.Override
+      public Builder clearField(
+          com.google.protobuf.Descriptors.FieldDescriptor field) {
+        return super.clearField(field);
+      }
+      @java.lang.Override
+      public Builder clearOneof(
+          com.google.protobuf.Descriptors.OneofDescriptor oneof) {
+        return super.clearOneof(oneof);
+      }
+      @java.lang.Override
+      public Builder setRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          int index, java.lang.Object value) {
+        return super.setRepeatedField(field, index, value);
+      }
+      @java.lang.Override
+      public Builder addRepeatedField(
+          com.google.protobuf.Descriptors.FieldDescriptor field,
+          java.lang.Object value) {
+        return super.addRepeatedField(field, value);
+      }
+      @java.lang.Override
+      public Builder mergeFrom(com.google.protobuf.Message other) {
+        if (other instanceof emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp) {
+          return mergeFrom((emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp)other);
+        } else {
+          super.mergeFrom(other);
+          return this;
+        }
+      }
+
+      public Builder mergeFrom(emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp other) {
+        if (other == emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp.getDefaultInstance()) return this;
+        if (other.getRetcode() != 0) {
+          setRetcode(other.getRetcode());
+        }
+        if (other.getCurValue() != 0) {
+          setCurValue(other.getCurValue());
+        }
+        this.mergeUnknownFields(other.unknownFields);
+        onChanged();
+        return this;
+      }
+
+      @java.lang.Override
+      public final boolean isInitialized() {
+        return true;
+      }
+
+      @java.lang.Override
+      public Builder mergeFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws java.io.IOException {
+        emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp parsedMessage = null;
+        try {
+          parsedMessage = PARSER.parsePartialFrom(input, extensionRegistry);
+        } catch (com.google.protobuf.InvalidProtocolBufferException e) {
+          parsedMessage = (emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp) e.getUnfinishedMessage();
+          throw e.unwrapIOException();
+        } finally {
+          if (parsedMessage != null) {
+            mergeFrom(parsedMessage);
+          }
+        }
+        return this;
+      }
+
+      private int retcode_ ;
+      /**
+       * <code>int32 retcode = 9;</code>
+       * @return The retcode.
+       */
+      @java.lang.Override
+      public int getRetcode() {
+        return retcode_;
+      }
+      /**
+       * <code>int32 retcode = 9;</code>
+       * @param value The retcode to set.
+       * @return This builder for chaining.
+       */
+      public Builder setRetcode(int value) {
+        
+        retcode_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>int32 retcode = 9;</code>
+       * @return This builder for chaining.
+       */
+      public Builder clearRetcode() {
+        
+        retcode_ = 0;
+        onChanged();
+        return this;
+      }
+
+      private int curValue_ ;
+      /**
+       * <code>uint32 cur_value = 3;</code>
+       * @return The curValue.
+       */
+      @java.lang.Override
+      public int getCurValue() {
+        return curValue_;
+      }
+      /**
+       * <code>uint32 cur_value = 3;</code>
+       * @param value The curValue to set.
+       * @return This builder for chaining.
+       */
+      public Builder setCurValue(int value) {
+        
+        curValue_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>uint32 cur_value = 3;</code>
+       * @return This builder for chaining.
+       */
+      public Builder clearCurValue() {
+        
+        curValue_ = 0;
+        onChanged();
+        return this;
+      }
+      @java.lang.Override
+      public final Builder setUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.setUnknownFields(unknownFields);
+      }
+
+      @java.lang.Override
+      public final Builder mergeUnknownFields(
+          final com.google.protobuf.UnknownFieldSet unknownFields) {
+        return super.mergeUnknownFields(unknownFields);
+      }
+
+
+      // @@protoc_insertion_point(builder_scope:BuyResinRsp)
+    }
+
+    // @@protoc_insertion_point(class_scope:BuyResinRsp)
+    private static final emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp DEFAULT_INSTANCE;
+    static {
+      DEFAULT_INSTANCE = new emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp();
+    }
+
+    public static emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp getDefaultInstance() {
+      return DEFAULT_INSTANCE;
+    }
+
+    private static final com.google.protobuf.Parser<BuyResinRsp>
+        PARSER = new com.google.protobuf.AbstractParser<BuyResinRsp>() {
+      @java.lang.Override
+      public BuyResinRsp parsePartialFrom(
+          com.google.protobuf.CodedInputStream input,
+          com.google.protobuf.ExtensionRegistryLite extensionRegistry)
+          throws com.google.protobuf.InvalidProtocolBufferException {
+        return new BuyResinRsp(input, extensionRegistry);
+      }
+    };
+
+    public static com.google.protobuf.Parser<BuyResinRsp> parser() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public com.google.protobuf.Parser<BuyResinRsp> getParserForType() {
+      return PARSER;
+    }
+
+    @java.lang.Override
+    public emu.grasscutter.net.proto.BuyResinRspOuterClass.BuyResinRsp getDefaultInstanceForType() {
+      return DEFAULT_INSTANCE;
+    }
+
+  }
+
+  private static final com.google.protobuf.Descriptors.Descriptor
+    internal_static_BuyResinRsp_descriptor;
+  private static final 
+    com.google.protobuf.GeneratedMessageV3.FieldAccessorTable
+      internal_static_BuyResinRsp_fieldAccessorTable;
+
+  public static com.google.protobuf.Descriptors.FileDescriptor
+      getDescriptor() {
+    return descriptor;
+  }
+  private static  com.google.protobuf.Descriptors.FileDescriptor
+      descriptor;
+  static {
+    java.lang.String[] descriptorData = {
+      "\n\021BuyResinRsp.proto\"1\n\013BuyResinRsp\022\017\n\007re" +
+      "tcode\030\t \001(\005\022\021\n\tcur_value\030\003 \001(\rB\033\n\031emu.gr" +
+      "asscutter.net.protob\006proto3"
+    };
+    descriptor = com.google.protobuf.Descriptors.FileDescriptor
+      .internalBuildGeneratedFileFrom(descriptorData,
+        new com.google.protobuf.Descriptors.FileDescriptor[] {
+        });
+    internal_static_BuyResinRsp_descriptor =
+      getDescriptor().getMessageTypes().get(0);
+    internal_static_BuyResinRsp_fieldAccessorTable = new
+      com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
+        internal_static_BuyResinRsp_descriptor,
+        new java.lang.String[] { "Retcode", "CurValue", });
+  }
+
+  // @@protoc_insertion_point(outer_class_scope)
+}

src/generated/main/java/emu/grasscutter/net/proto/ResinChangeNotifyOuterClass.java

@@ -25,23 +25,18 @@ public final class ResinChangeNotifyOuterClass {
     int getCurValue();
 
     /**
-     * <code>uint32 curBuyCount = 13;</code>
+     * <code>uint32 next_add_timestamp = 13;</code>
-     * @return The curBuyCount.
-     */
-    int getCurBuyCount();
-
-    /**
-     * <code>uint32 nextAddTimestamp = 12;</code>
      * @return The nextAddTimestamp.
      */
     int getNextAddTimestamp();
+
+    /**
+     * <code>uint32 cur_buy_count = 12;</code>
+     * @return The curBuyCount.
+     */
+    int getCurBuyCount();
   }
   /**
-   * <pre>
-   * Name: IBIMGHOHNDK
-   * CmdId: 649
-   * </pre>
-   *
    * Protobuf type {@code ResinChangeNotify}
    */
   public static final class ResinChangeNotify extends
@@ -88,12 +83,12 @@ public final class ResinChangeNotifyOuterClass {
               break;
             case 96: {
 
-              nextAddTimestamp_ = input.readUInt32();
+              curBuyCount_ = input.readUInt32();
               break;
             }
             case 104: {
 
-              curBuyCount_ = input.readUInt32();
+              nextAddTimestamp_ = input.readUInt32();
               break;
             }
             case 112: {
@@ -144,21 +139,10 @@ public final class ResinChangeNotifyOuterClass {
       return curValue_;
     }
 
-    public static final int CURBUYCOUNT_FIELD_NUMBER = 13;
+    public static final int NEXT_ADD_TIMESTAMP_FIELD_NUMBER = 13;
-    private int curBuyCount_;
-    /**
-     * <code>uint32 curBuyCount = 13;</code>
-     * @return The curBuyCount.
-     */
-    @java.lang.Override
-    public int getCurBuyCount() {
-      return curBuyCount_;
-    }
-
-    public static final int NEXTADDTIMESTAMP_FIELD_NUMBER = 12;
     private int nextAddTimestamp_;
     /**
-     * <code>uint32 nextAddTimestamp = 12;</code>
+     * <code>uint32 next_add_timestamp = 13;</code>
      * @return The nextAddTimestamp.
      */
     @java.lang.Override
@@ -166,6 +150,17 @@ public final class ResinChangeNotifyOuterClass {
       return nextAddTimestamp_;
     }
 
+    public static final int CUR_BUY_COUNT_FIELD_NUMBER = 12;
+    private int curBuyCount_;
+    /**
+     * <code>uint32 cur_buy_count = 12;</code>
+     * @return The curBuyCount.
+     */
+    @java.lang.Override
+    public int getCurBuyCount() {
+      return curBuyCount_;
+    }
+
     private byte memoizedIsInitialized = -1;
     @java.lang.Override
     public final boolean isInitialized() {
@@ -180,11 +175,11 @@ public final class ResinChangeNotifyOuterClass {
     @java.lang.Override
     public void writeTo(com.google.protobuf.CodedOutputStream output)
                         throws java.io.IOException {
-      if (nextAddTimestamp_ != 0) {
-        output.writeUInt32(12, nextAddTimestamp_);
-      }
       if (curBuyCount_ != 0) {
-        output.writeUInt32(13, curBuyCount_);
+        output.writeUInt32(12, curBuyCount_);
+      }
+      if (nextAddTimestamp_ != 0) {
+        output.writeUInt32(13, nextAddTimestamp_);
       }
       if (curValue_ != 0) {
         output.writeUInt32(14, curValue_);
@@ -198,13 +193,13 @@ public final class ResinChangeNotifyOuterClass {
       if (size != -1) return size;
 
       size = 0;
-      if (nextAddTimestamp_ != 0) {
-        size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(12, nextAddTimestamp_);
-      }
       if (curBuyCount_ != 0) {
         size += com.google.protobuf.CodedOutputStream
-          .computeUInt32Size(13, curBuyCount_);
+          .computeUInt32Size(12, curBuyCount_);
+      }
+      if (nextAddTimestamp_ != 0) {
+        size += com.google.protobuf.CodedOutputStream
+          .computeUInt32Size(13, nextAddTimestamp_);
       }
       if (curValue_ != 0) {
         size += com.google.protobuf.CodedOutputStream
@@ -227,10 +222,10 @@ public final class ResinChangeNotifyOuterClass {
 
       if (getCurValue()
           != other.getCurValue()) return false;
-      if (getCurBuyCount()
-          != other.getCurBuyCount()) return false;
       if (getNextAddTimestamp()
           != other.getNextAddTimestamp()) return false;
+      if (getCurBuyCount()
+          != other.getCurBuyCount()) return false;
       if (!unknownFields.equals(other.unknownFields)) return false;
       return true;
     }
@@ -244,10 +239,10 @@ public final class ResinChangeNotifyOuterClass {
       hash = (19 * hash) + getDescriptor().hashCode();
       hash = (37 * hash) + CUR_VALUE_FIELD_NUMBER;
       hash = (53 * hash) + getCurValue();
-      hash = (37 * hash) + CURBUYCOUNT_FIELD_NUMBER;
+      hash = (37 * hash) + NEXT_ADD_TIMESTAMP_FIELD_NUMBER;
-      hash = (53 * hash) + getCurBuyCount();
-      hash = (37 * hash) + NEXTADDTIMESTAMP_FIELD_NUMBER;
       hash = (53 * hash) + getNextAddTimestamp();
+      hash = (37 * hash) + CUR_BUY_COUNT_FIELD_NUMBER;
+      hash = (53 * hash) + getCurBuyCount();
       hash = (29 * hash) + unknownFields.hashCode();
       memoizedHashCode = hash;
       return hash;
@@ -344,11 +339,6 @@ public final class ResinChangeNotifyOuterClass {
       return builder;
     }
     /**
-     * <pre>
-     * Name: IBIMGHOHNDK
-     * CmdId: 649
-     * </pre>
-     *
      * Protobuf type {@code ResinChangeNotify}
      */
     public static final class Builder extends
@@ -388,10 +378,10 @@ public final class ResinChangeNotifyOuterClass {
         super.clear();
         curValue_ = 0;
 
-        curBuyCount_ = 0;
-
         nextAddTimestamp_ = 0;
 
+        curBuyCount_ = 0;
+
         return this;
       }
 
@@ -419,8 +409,8 @@ public final class ResinChangeNotifyOuterClass {
       public emu.grasscutter.net.proto.ResinChangeNotifyOuterClass.ResinChangeNotify buildPartial() {
         emu.grasscutter.net.proto.ResinChangeNotifyOuterClass.ResinChangeNotify result = new emu.grasscutter.net.proto.ResinChangeNotifyOuterClass.ResinChangeNotify(this);
         result.curValue_ = curValue_;
-        result.curBuyCount_ = curBuyCount_;
         result.nextAddTimestamp_ = nextAddTimestamp_;
+        result.curBuyCount_ = curBuyCount_;
         onBuilt();
         return result;
       }
@@ -472,12 +462,12 @@ public final class ResinChangeNotifyOuterClass {
         if (other.getCurValue() != 0) {
           setCurValue(other.getCurValue());
         }
-        if (other.getCurBuyCount() != 0) {
-          setCurBuyCount(other.getCurBuyCount());
-        }
         if (other.getNextAddTimestamp() != 0) {
           setNextAddTimestamp(other.getNextAddTimestamp());
         }
+        if (other.getCurBuyCount() != 0) {
+          setCurBuyCount(other.getCurBuyCount());
+        }
         this.mergeUnknownFields(other.unknownFields);
         onChanged();
         return this;
@@ -538,40 +528,9 @@ public final class ResinChangeNotifyOuterClass {
         return this;
       }
 
-      private int curBuyCount_ ;
-      /**
-       * <code>uint32 curBuyCount = 13;</code>
-       * @return The curBuyCount.
-       */
-      @java.lang.Override
-      public int getCurBuyCount() {
-        return curBuyCount_;
-      }
-      /**
-       * <code>uint32 curBuyCount = 13;</code>
-       * @param value The curBuyCount to set.
-       * @return This builder for chaining.
-       */
-      public Builder setCurBuyCount(int value) {
-        
-        curBuyCount_ = value;
-        onChanged();
-        return this;
-      }
-      /**
-       * <code>uint32 curBuyCount = 13;</code>
-       * @return This builder for chaining.
-       */
-      public Builder clearCurBuyCount() {
-        
-        curBuyCount_ = 0;
-        onChanged();
-        return this;
-      }
-
       private int nextAddTimestamp_ ;
       /**
-       * <code>uint32 nextAddTimestamp = 12;</code>
+       * <code>uint32 next_add_timestamp = 13;</code>
        * @return The nextAddTimestamp.
        */
       @java.lang.Override
@@ -579,7 +538,7 @@ public final class ResinChangeNotifyOuterClass {
         return nextAddTimestamp_;
       }
       /**
-       * <code>uint32 nextAddTimestamp = 12;</code>
+       * <code>uint32 next_add_timestamp = 13;</code>
        * @param value The nextAddTimestamp to set.
        * @return This builder for chaining.
        */
@@ -590,7 +549,7 @@ public final class ResinChangeNotifyOuterClass {
         return this;
       }
       /**
-       * <code>uint32 nextAddTimestamp = 12;</code>
+       * <code>uint32 next_add_timestamp = 13;</code>
        * @return This builder for chaining.
        */
       public Builder clearNextAddTimestamp() {
@@ -599,6 +558,37 @@ public final class ResinChangeNotifyOuterClass {
         onChanged();
         return this;
       }
+
+      private int curBuyCount_ ;
+      /**
+       * <code>uint32 cur_buy_count = 12;</code>
+       * @return The curBuyCount.
+       */
+      @java.lang.Override
+      public int getCurBuyCount() {
+        return curBuyCount_;
+      }
+      /**
+       * <code>uint32 cur_buy_count = 12;</code>
+       * @param value The curBuyCount to set.
+       * @return This builder for chaining.
+       */
+      public Builder setCurBuyCount(int value) {
+        
+        curBuyCount_ = value;
+        onChanged();
+        return this;
+      }
+      /**
+       * <code>uint32 cur_buy_count = 12;</code>
+       * @return This builder for chaining.
+       */
+      public Builder clearCurBuyCount() {
+        
+        curBuyCount_ = 0;
+        onChanged();
+        return this;
+      }
       @java.lang.Override
       public final Builder setUnknownFields(
           final com.google.protobuf.UnknownFieldSet unknownFields) {
@@ -666,10 +656,10 @@ public final class ResinChangeNotifyOuterClass {
       descriptor;
   static {
     java.lang.String[] descriptorData = {
-      "\n\027ResinChangeNotify.proto\"U\n\021ResinChange" +
+      "\n\027ResinChangeNotify.proto\"Y\n\021ResinChange" +
-      "Notify\022\021\n\tcur_value\030\016 \001(\r\022\023\n\013curBuyCount" +
+      "Notify\022\021\n\tcur_value\030\016 \001(\r\022\032\n\022next_add_ti" +
-      "\030\r \001(\r\022\030\n\020nextAddTimestamp\030\014 \001(\rB\033\n\031emu." +
+      "mestamp\030\r \001(\r\022\025\n\rcur_buy_count\030\014 \001(\rB\033\n\031" +
-      "grasscutter.net.protob\006proto3"
+      "emu.grasscutter.net.protob\006proto3"
     };
     descriptor = com.google.protobuf.Descriptors.FileDescriptor
       .internalBuildGeneratedFileFrom(descriptorData,
@@ -680,7 +670,7 @@ public final class ResinChangeNotifyOuterClass {
     internal_static_ResinChangeNotify_fieldAccessorTable = new
       com.google.protobuf.GeneratedMessageV3.FieldAccessorTable(
         internal_static_ResinChangeNotify_descriptor,
-        new java.lang.String[] { "CurValue", "CurBuyCount", "NextAddTimestamp", });
+        new java.lang.String[] { "CurValue", "NextAddTimestamp", "CurBuyCount", });
   }
 
   // @@protoc_insertion_point(outer_class_scope)

src/main/java/emu/grasscutter/game/managers/ResinManager.java

@@ -1,16 +1,22 @@
 package emu.grasscutter.game.managers;
 
-import static emu.grasscutter.config.Configuration.GAME_OPTIONS;
+import emu.grasscutter.game.inventory.GameItem;
-
 import emu.grasscutter.game.player.BasePlayerManager;
 import emu.grasscutter.game.player.Player;
+import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.PlayerProperty;
 import emu.grasscutter.game.props.WatcherTriggerType;
-import emu.grasscutter.server.packet.send.PacketPlayerPropNotify;
+import emu.grasscutter.net.proto.RetcodeOuterClass;
+import emu.grasscutter.server.packet.send.PacketItemAddHintNotify;
 import emu.grasscutter.server.packet.send.PacketResinChangeNotify;
 import emu.grasscutter.utils.Utils;
 
+import static emu.grasscutter.config.Configuration.GAME_OPTIONS;
+
 public class ResinManager extends BasePlayerManager {
+    public static final int MAX_RESIN_BUYING_COUNT = 6;
+    public static final int AMOUNT_TO_ADD = 60;
+    public static final int[] HCOIN_NUM_TO_BUY_RESIN = new int[]{50, 100, 100, 150, 200, 200};
 
     public ResinManager(Player player) {
         super(player);
@@ -146,4 +152,22 @@ public class ResinManager extends BasePlayerManager {
         // Send initial notifications on logon.
         this.player.sendPacket(new PacketResinChangeNotify(this.player));
     }
+
+    public int buy() {
+        if (this.player.getResinBuyCount() >= MAX_RESIN_BUYING_COUNT) {
+            return RetcodeOuterClass.Retcode.RET_RESIN_BOUGHT_COUNT_EXCEEDED_VALUE;
+        }
+
+        var res = this.player.getInventory().payItem(201, HCOIN_NUM_TO_BUY_RESIN[this.player.getResinBuyCount()]);
+        if (!res) {
+            return RetcodeOuterClass.Retcode.RET_HCOIN_NOT_ENOUGH_VALUE;
+        }
+
+        this.player.setResinBuyCount(this.player.getResinBuyCount() + 1);
+        this.player.setProperty(PlayerProperty.PROP_PLAYER_WAIT_SUB_HCOIN, 0);
+        this.addResin(AMOUNT_TO_ADD);
+        this.player.sendPacket(new PacketItemAddHintNotify(new GameItem(106, AMOUNT_TO_ADD), ActionReason.BuyResin));
+
+        return 0;
+    }
 }

src/main/java/emu/grasscutter/game/player/Player.java

@@ -15,29 +15,30 @@ import emu.grasscutter.game.activity.ActivityManager;
 import emu.grasscutter.game.avatar.Avatar;
 import emu.grasscutter.game.avatar.AvatarStorage;
 import emu.grasscutter.game.battlepass.BattlePassManager;
-import emu.grasscutter.game.entity.*;
+import emu.grasscutter.game.entity.GameEntity;
-import emu.grasscutter.game.home.GameHome;
 import emu.grasscutter.game.expedition.ExpeditionInfo;
 import emu.grasscutter.game.friends.FriendsList;
 import emu.grasscutter.game.friends.PlayerProfile;
 import emu.grasscutter.game.gacha.PlayerGachaInfo;
+import emu.grasscutter.game.home.GameHome;
 import emu.grasscutter.game.inventory.GameItem;
 import emu.grasscutter.game.inventory.Inventory;
 import emu.grasscutter.game.mail.Mail;
 import emu.grasscutter.game.mail.MailHandler;
-import emu.grasscutter.game.managers.cooking.ActiveCookCompoundData;
-import emu.grasscutter.game.managers.cooking.CookingCompoundManager;
-import emu.grasscutter.game.managers.cooking.CookingManager;
 import emu.grasscutter.game.managers.FurnitureManager;
 import emu.grasscutter.game.managers.ResinManager;
 import emu.grasscutter.game.managers.SatiationManager;
+import emu.grasscutter.game.managers.SotSManager;
+import emu.grasscutter.game.managers.cooking.ActiveCookCompoundData;
+import emu.grasscutter.game.managers.cooking.CookingCompoundManager;
+import emu.grasscutter.game.managers.cooking.CookingManager;
 import emu.grasscutter.game.managers.deforestation.DeforestationManager;
 import emu.grasscutter.game.managers.energy.EnergyManager;
 import emu.grasscutter.game.managers.forging.ActiveForgeData;
 import emu.grasscutter.game.managers.forging.ForgingManager;
-import emu.grasscutter.game.managers.mapmark.*;
+import emu.grasscutter.game.managers.mapmark.MapMark;
+import emu.grasscutter.game.managers.mapmark.MapMarksManager;
 import emu.grasscutter.game.managers.stamina.StaminaManager;
-import emu.grasscutter.game.managers.SotSManager;
 import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.ClimateType;
 import emu.grasscutter.game.props.PlayerProperty;
@@ -50,17 +51,20 @@ import emu.grasscutter.game.tower.TowerManager;
 import emu.grasscutter.game.world.Scene;
 import emu.grasscutter.game.world.World;
 import emu.grasscutter.net.packet.BasePacket;
-import emu.grasscutter.net.proto.*;
 import emu.grasscutter.net.proto.AbilityInvokeEntryOuterClass.AbilityInvokeEntry;
 import emu.grasscutter.net.proto.AttackResultOuterClass.AttackResult;
 import emu.grasscutter.net.proto.CombatInvokeEntryOuterClass.CombatInvokeEntry;
 import emu.grasscutter.net.proto.GadgetInteractReqOuterClass.GadgetInteractReq;
 import emu.grasscutter.net.proto.MpSettingTypeOuterClass.MpSettingType;
 import emu.grasscutter.net.proto.OnlinePlayerInfoOuterClass.OnlinePlayerInfo;
+import emu.grasscutter.net.proto.PlayerApplyEnterMpResultNotifyOuterClass;
 import emu.grasscutter.net.proto.PlayerLocationInfoOuterClass.PlayerLocationInfo;
+import emu.grasscutter.net.proto.PlayerWorldLocationInfoOuterClass;
 import emu.grasscutter.net.proto.ProfilePictureOuterClass.ProfilePicture;
 import emu.grasscutter.net.proto.PropChangeReasonOuterClass.PropChangeReason;
+import emu.grasscutter.net.proto.ShowAvatarInfoOuterClass;
 import emu.grasscutter.net.proto.SocialDetailOuterClass.SocialDetail;
+import emu.grasscutter.net.proto.SocialShowAvatarInfoOuterClass;
 import emu.grasscutter.scripts.data.SceneRegion;
 import emu.grasscutter.server.event.player.PlayerJoinEvent;
 import emu.grasscutter.server.event.player.PlayerQuitEvent;
@@ -69,16 +73,14 @@ import emu.grasscutter.server.game.GameSession;
 import emu.grasscutter.server.game.GameSession.SessionState;
 import emu.grasscutter.server.packet.send.*;
 import emu.grasscutter.utils.DateHelper;
-import emu.grasscutter.utils.Position;
 import emu.grasscutter.utils.MessageHandler;
+import emu.grasscutter.utils.Position;
 import emu.grasscutter.utils.Utils;
 import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
 import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
 import lombok.Getter;
 import lombok.Setter;
 
-import static emu.grasscutter.config.Configuration.*;
-
 import java.time.DayOfWeek;
 import java.time.Instant;
 import java.time.LocalDate;
@@ -87,6 +89,8 @@ import java.util.*;
 import java.util.concurrent.CopyOnWriteArraySet;
 import java.util.concurrent.LinkedBlockingQueue;
 
+import static emu.grasscutter.config.Configuration.GAME_OPTIONS;
+
 @Entity(value = "players", useDiscriminator = false)
 public class Player {
     @Id private int id;
@@ -199,6 +203,7 @@ public class Player {
     @Getter @Setter private long springLastUsed;
     private HashMap<String, MapMark> mapMarks;  // Getter makes an empty hashmap - maybe do this elsewhere?
     @Getter @Setter private int nextResinRefresh;
+    @Getter @Setter private int resinBuyCount;
     @Getter @Setter private int lastDailyReset;
     @Getter private transient MpSettingType mpSetting = MpSettingType.MP_SETTING_TYPE_ENTER_AFTER_APPLY;  // TODO
 
@@ -1145,6 +1150,9 @@ public class Player {
             this.getBattlePassManager().resetWeeklyMissions();
         }
 
+        // Reset resin-buying count.
+        this.setResinBuyCount(0);
+
         // Done. Update last reset time.
         this.setLastDailyReset(currentTime);
     }

src/main/java/emu/grasscutter/game/props/ItemUseAction/ItemUseAddItem.java

@@ -1,5 +1,6 @@
 package emu.grasscutter.game.props.ItemUseAction;
 
+import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.ItemUseOp;
 
 public class ItemUseAddItem extends ItemUseInt {
@@ -19,6 +20,6 @@ public class ItemUseAddItem extends ItemUseInt {
 
     @Override
     public boolean useItem(UseItemParams params) {
-        return params.player.getInventory().addItem(this.i, this.count * params.count);
+        return params.player.getInventory().addItem(this.i, this.count * params.count, ActionReason.PlayerUseItem);
     }
 }

src/main/java/emu/grasscutter/server/packet/recv/HandlerBuyResinReq.java

@@ -0,0 +1,16 @@
+package emu.grasscutter.server.packet.recv;
+
+import emu.grasscutter.net.packet.Opcodes;
+import emu.grasscutter.net.packet.PacketHandler;
+import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.server.game.GameSession;
+import emu.grasscutter.server.packet.send.PacketBuyResinRsp;
+
+@Opcodes(PacketOpcodes.BuyResinReq)
+public class HandlerBuyResinReq extends PacketHandler {
+    @Override
+    public void handle(GameSession session, byte[] header, byte[] payload) throws Exception {
+        var player = session.getPlayer();
+        session.send(new PacketBuyResinRsp(player, player.getResinManager().buy()));
+    }
+}

src/main/java/emu/grasscutter/server/packet/send/PacketBuyResinRsp.java

@@ -0,0 +1,18 @@
+package emu.grasscutter.server.packet.send;
+
+import emu.grasscutter.game.player.Player;
+import emu.grasscutter.game.props.PlayerProperty;
+import emu.grasscutter.net.packet.BasePacket;
+import emu.grasscutter.net.packet.PacketOpcodes;
+import emu.grasscutter.net.proto.BuyResinRspOuterClass;
+
+public class PacketBuyResinRsp extends BasePacket {
+    public PacketBuyResinRsp(Player player, int ret) {
+        super(PacketOpcodes.BuyResinRsp);
+
+        this.setData(BuyResinRspOuterClass.BuyResinRsp.newBuilder()
+            .setCurValue(player.getProperty(PlayerProperty.PROP_PLAYER_RESIN))
+            .setRetcode(ret)
+            .build());
+    }
+}

src/main/java/emu/grasscutter/server/packet/send/PacketResinChangeNotify.java

@@ -14,10 +14,9 @@ public class PacketResinChangeNotify extends BasePacket {
         ResinChangeNotify proto = ResinChangeNotify.newBuilder()
             .setCurValue(player.getProperty(PlayerProperty.PROP_PLAYER_RESIN))
             .setNextAddTimestamp(player.getNextResinRefresh())
+            .setCurBuyCount(player.getResinBuyCount())
             .build();
 
-		// ToDo: Add ability to buy resin with primogems, has to be included here.
-		
         this.setData(proto);
     }
 }