package com.pingcap.ch;

import com.pingcap.common.WriteBuffer;
import java.io.IOException;
import java.util.List;
import shade.com.google.common.base.Preconditions;

public abstract class CHSetting {
  public String name;

  public CHSetting(String name) {
    this.name = name;
  }

  public abstract void write(WriteBuffer writer) throws IOException;

  public static void serialize(List<CHSetting> settings, WriteBuffer writer) throws IOException {
    for (CHSetting setting : settings) {
      writer.writeUTF8StrWithVarLen(setting.name);
      setting.write(writer);
    }
    // An empty string is a marker for the end of the settings.
    writer.writeUTF8StrWithVarLen("");
  }

  public static class SettingInt extends CHSetting {
    public long value;

    public SettingInt(String name, long value) {
      super(name);
      this.value = value;
    }

    @Override
    public void write(WriteBuffer writer) throws IOException {
      writer.writeVarInt64(value);
    }
  }

  public static class SettingUInt extends CHSetting {
    public long value;

    public SettingUInt(String name, long value) {
      super(name);
      Preconditions.checkArgument(value >= 0);
      this.value = value;
    }

    @Override
    public void write(WriteBuffer writer) throws IOException {
      writer.writeVarUInt64(value);
    }
  }

  public static class SettingString extends CHSetting {
    public String value;

    public SettingString(String name, String value) {
      super(name);
      this.value = value;
    }

    @Override
    public void write(WriteBuffer writer) throws IOException {
      writer.writeUTF8StrWithVarLen(value);
    }
  }
}