Add proto representation for HumanComment along with a converter

Bug: Google b/289357382
Release-Notes: skip
Change-Id: Ib0407a7113e58925bbab30af9adb503b347ef74f
Forward-Compatible: checked
diff --git a/java/com/google/gerrit/entities/Comment.java b/java/com/google/gerrit/entities/Comment.java
index e1e143c..baac18f 100644
--- a/java/com/google/gerrit/entities/Comment.java
+++ b/java/com/google/gerrit/entities/Comment.java
@@ -216,7 +216,7 @@
   public int lineNbr;
 
   public Identity author;
-  protected Identity realAuthor;
+  public Identity realAuthor;
 
   // TODO(issue-15525): Migrate this field from Timestamp to Instant
   public Timestamp writtenOn;
diff --git a/java/com/google/gerrit/entities/converter/HumanCommentProtoConverter.java b/java/com/google/gerrit/entities/converter/HumanCommentProtoConverter.java
new file mode 100644
index 0000000..d14aa97
--- /dev/null
+++ b/java/com/google/gerrit/entities/converter/HumanCommentProtoConverter.java
@@ -0,0 +1,142 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.entities.converter;
+
+import static com.google.gerrit.entities.Patch.PATCHSET_LEVEL;
+
+import com.google.errorprone.annotations.Immutable;
+import com.google.gerrit.entities.Account;
+import com.google.gerrit.entities.Comment;
+import com.google.gerrit.entities.Comment.Range;
+import com.google.gerrit.entities.HumanComment;
+import com.google.gerrit.proto.Entities;
+import com.google.gerrit.proto.Entities.HumanComment.InFilePosition;
+import com.google.gerrit.proto.Entities.HumanComment.InFilePosition.Side;
+import com.google.protobuf.Parser;
+import java.time.Instant;
+import java.util.Optional;
+import org.eclipse.jgit.lib.ObjectId;
+
+/** Proto converter between {@link HumanComment} and {@link Entities.HumanComment}. */
+@Immutable
+public enum HumanCommentProtoConverter
+    implements ProtoConverter<Entities.HumanComment, HumanComment> {
+  INSTANCE;
+
+  private final ProtoConverter<Entities.Account_Id, Account.Id> accountIdConverter =
+      AccountIdProtoConverter.INSTANCE;
+  private final ProtoConverter<Entities.ObjectId, ObjectId> objectIdConverter =
+      ObjectIdProtoConverter.INSTANCE;
+
+  @Override
+  public Entities.HumanComment toProto(HumanComment val) {
+
+    Entities.HumanComment.Builder res =
+        Entities.HumanComment.newBuilder()
+            .setPatchsetId(val.key.patchSetId)
+            .setAccountId(accountIdConverter.toProto(val.author.getId()))
+            .setCommentUuid(val.key.uuid)
+            .setCommentText(val.message)
+            .setUnresolved(val.unresolved)
+            .setWrittenOnMillis(val.writtenOn.toInstant().toEpochMilli())
+            .setServerId(val.serverId);
+    if (!val.key.filename.equals(PATCHSET_LEVEL)) {
+      InFilePosition.Builder inFilePos =
+          InFilePosition.newBuilder()
+              .setFilePath(val.key.filename)
+              .setSide(val.side <= 0 ? Side.PARENT : Side.REVISION);
+      if (val.range != null) {
+        inFilePos.setPositionRange(
+            InFilePosition.Range.newBuilder()
+                .setStartLine(val.range.startLine)
+                .setStartChar(val.range.startChar)
+                .setEndLine(val.range.endLine)
+                .setEndChar(val.range.endChar));
+      }
+      if (val.lineNbr != 0) {
+        inFilePos.setLineNumber(val.lineNbr);
+      }
+      res.setInFilePosition(inFilePos);
+    }
+
+    if (val.parentUuid != null) {
+      res.setParentCommentUuid(val.parentUuid);
+    }
+    if (val.tag != null) {
+      res.setTag(val.tag);
+    }
+    if (val.realAuthor != null) {
+      res.setRealAuthor(accountIdConverter.toProto(val.realAuthor.getId()));
+    }
+    if (val.getCommitId() != null) {
+      res.setDestCommitId(objectIdConverter.toProto(val.getCommitId()));
+    }
+
+    return res.build();
+  }
+
+  @Override
+  public HumanComment fromProto(Entities.HumanComment proto) {
+    Optional<InFilePosition> optInFilePosition =
+        proto.hasInFilePosition() ? Optional.of(proto.getInFilePosition()) : Optional.empty();
+    Comment.Key key =
+        new Comment.Key(
+            proto.getCommentUuid(),
+            optInFilePosition.isPresent() ? optInFilePosition.get().getFilePath() : PATCHSET_LEVEL,
+            proto.getPatchsetId());
+    HumanComment res =
+        new HumanComment(
+            key,
+            accountIdConverter.fromProto(proto.getAccountId()),
+            Instant.ofEpochMilli(proto.getWrittenOnMillis()),
+            optInFilePosition.isPresent()
+                ? (short) optInFilePosition.get().getSide().getNumber()
+                : Side.REVISION_VALUE,
+            proto.getCommentText(),
+            proto.getServerId(),
+            proto.getUnresolved());
+
+    res.parentUuid = proto.hasParentCommentUuid() ? proto.getParentCommentUuid() : null;
+    res.tag = proto.hasTag() ? proto.getTag() : null;
+    if (proto.hasRealAuthor()) {
+      res.realAuthor = new Comment.Identity(accountIdConverter.fromProto(proto.getRealAuthor()));
+    }
+    if (proto.hasDestCommitId()) {
+      res.setCommitId(objectIdConverter.fromProto(proto.getDestCommitId()));
+    }
+
+    optInFilePosition.ifPresent(
+        inFilePosition -> {
+          if (inFilePosition.hasPositionRange()) {
+            var range = inFilePosition.getPositionRange();
+            res.range =
+                new Range(
+                    range.getStartLine(),
+                    range.getStartChar(),
+                    range.getEndLine(),
+                    range.getEndChar());
+          }
+          if (inFilePosition.hasLineNumber()) {
+            res.lineNbr = inFilePosition.getLineNumber();
+          }
+        });
+    return res;
+  }
+
+  @Override
+  public Parser<Entities.HumanComment> getParser() {
+    return Entities.HumanComment.parser();
+  }
+}
diff --git a/javatests/com/google/gerrit/entities/converter/BUILD b/javatests/com/google/gerrit/entities/converter/BUILD
index 6c4d1e4..0ca9478 100644
--- a/javatests/com/google/gerrit/entities/converter/BUILD
+++ b/javatests/com/google/gerrit/entities/converter/BUILD
@@ -5,6 +5,7 @@
     srcs = glob(["*.java"]),
     deps = [
         "//java/com/google/gerrit/entities",
+        "//java/com/google/gerrit/extensions:api",
         "//java/com/google/gerrit/proto/testing",
         "//java/com/google/gerrit/server",
         "//lib:guava",
diff --git a/javatests/com/google/gerrit/entities/converter/HumanCommentProtoConverterTest.java b/javatests/com/google/gerrit/entities/converter/HumanCommentProtoConverterTest.java
new file mode 100644
index 0000000..a6aaf36
--- /dev/null
+++ b/javatests/com/google/gerrit/entities/converter/HumanCommentProtoConverterTest.java
@@ -0,0 +1,130 @@
+// Copyright (C) 2023 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.entities.converter;
+
+import static com.google.common.truth.Truth.assertThat;
+import static com.google.gerrit.entities.Patch.PATCHSET_LEVEL;
+
+import com.google.gerrit.entities.Account;
+import com.google.gerrit.entities.Comment;
+import com.google.gerrit.entities.CommentRange;
+import com.google.gerrit.entities.HumanComment;
+import java.time.Instant;
+import org.eclipse.jgit.lib.ObjectId;
+import org.junit.Test;
+
+public class HumanCommentProtoConverterTest {
+  private static final ObjectId VALID_OBJECT_ID =
+      ObjectId.fromString("deadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+
+  private final HumanCommentProtoConverter converter = HumanCommentProtoConverter.INSTANCE;
+
+  @Test
+  public void fileLevelCommentWithAllOptionalFields() {
+    HumanComment orig =
+        new HumanComment(
+            new Comment.Key("uuid", "a.txt", 42),
+            Account.id(314),
+            Instant.ofEpochMilli(12345),
+            (short) 1,
+            "message",
+            "server",
+            /* unresolved= */ true);
+    orig.tag = "tag";
+    orig.setCommitId(VALID_OBJECT_ID);
+    orig.setRealAuthor(Account.id(271));
+
+    HumanComment res = converter.fromProto(converter.toProto(orig));
+
+    assertThat(res).isEqualTo(orig);
+  }
+
+  @Test
+  public void patchsetLevelComment() {
+    HumanComment orig =
+        new HumanComment(
+            new Comment.Key("uuid", PATCHSET_LEVEL, 42),
+            Account.id(314),
+            Instant.ofEpochMilli(12345),
+            (short) 1,
+            "message",
+            "server",
+            /* unresolved= */ false);
+
+    HumanComment res = converter.fromProto(converter.toProto(orig));
+
+    assertThat(res).isEqualTo(orig);
+  }
+
+  @Test
+  public void lineComment() {
+    HumanComment orig =
+        new HumanComment(
+            new Comment.Key("uuid", "a.txt", 42),
+            Account.id(314),
+            Instant.ofEpochMilli(12345),
+            (short) 1,
+            "message",
+            "server",
+            /* unresolved= */ true);
+    orig.setLineNbrAndRange(7, null);
+
+    HumanComment res = converter.fromProto(converter.toProto(orig));
+
+    assertThat(res).isEqualTo(orig);
+  }
+
+  @Test
+  public void rangeComment() {
+    HumanComment orig =
+        new HumanComment(
+            new Comment.Key("uuid", "a.txt", 42),
+            Account.id(314),
+            Instant.ofEpochMilli(12345),
+            (short) 1,
+            "message",
+            "server",
+            /* unresolved= */ true);
+    orig.setRange(new CommentRange(2, 3, 5, 7));
+
+    HumanComment res = converter.fromProto(converter.toProto(orig));
+
+    assertThat(res).isEqualTo(orig);
+  }
+
+  @Test
+  public void extensionRangeComment() {
+    HumanComment orig =
+        new HumanComment(
+            new Comment.Key("uuid", "a.txt", 42),
+            Account.id(314),
+            Instant.ofEpochMilli(12345),
+            (short) 1,
+            "message",
+            "server",
+            /* unresolved= */ false);
+    com.google.gerrit.extensions.client.Comment.Range range =
+        new com.google.gerrit.extensions.client.Comment.Range();
+    range.startLine = 2;
+    range.startCharacter = 3;
+    range.endLine = 5;
+    range.endCharacter = 7;
+    orig.setLineNbrAndRange(null, range);
+
+    HumanComment res = converter.fromProto(converter.toProto(orig));
+
+    assertThat(res).isEqualTo(orig);
+  }
+}
diff --git a/proto/entities.proto b/proto/entities.proto
index 3412291..335db62 100644
--- a/proto/entities.proto
+++ b/proto/entities.proto
@@ -311,3 +311,64 @@
   }
   optional EditPreferencesInfo edit_preferences_info = 3;
 }
+
+// Next Id: 13
+message HumanComment {
+  // Required. Note that the equivalent Java struct does not contain the change
+  // ID, so we keep the same format here.
+  optional int32 patchset_id = 1;
+  optional ObjectId dest_commit_id = 2;
+  // Required.
+  optional Account_Id account_id = 3;
+  optional Account_Id real_author = 4;
+
+  // Next Id: 5
+  message InFilePosition {
+    optional string file_path = 1;
+    enum Side {
+      // Should match the logic in
+      // http://google3/third_party/java_src/gerritcodereview/gerrit/java/com/google/gerrit/extensions/client/Side.java?rcl=579772037&l=24
+      PARENT = 0;
+      REVISION = 1;
+    }
+    // Default should match
+    // http://google3/third_party/java_src/gerritcodereview/gerrit/Documentation/rest-api-changes.txt?l=7423
+    optional Side side = 2 [default = REVISION];
+    message Range {
+      // 1-based
+      optional int32 start_line = 1;
+      // 0-based
+      optional int32 start_char = 2;
+      // 1-based
+      optional int32 end_line = 3;
+      // 0-based
+      optional int32 end_char = 4;
+    }
+    // If neither range nor line number set, the comment is on the file level. It is possible
+    // (though not required) for both values to be set. in this case, it is expected that the line
+    // number is identical to the range's end line.
+    optional Range position_range = 3;
+    // 1-based
+    optional int32 line_number = 4;
+  }
+
+  // If not set, the comment is on the patchset level.
+  optional InFilePosition in_file_position = 5;
+
+  // Required.
+  optional string comment_text = 6;
+  // Might be set by the user while creating the draft.
+  // See http://go/gerrit-rest-api-change#comment-info.
+  optional string tag = 7;
+  optional bool unresolved = 8 [default = false];
+
+  // Required.
+  optional string comment_uuid = 9;
+  // Required.
+  optional string parent_comment_uuid = 10;
+
+  // Required. Epoch millis.
+  optional fixed64 written_on_millis = 11;
+  // Required.
+  optional string server_id = 12;
+}
\ No newline at end of file