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/*
 * 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 org.apache.iceberg.ksyun.ks3;

import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
import org.apache.iceberg.relocated.com.google.common.collect.Maps;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.UncheckedIOException;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

/**
 * Convert Map properties to bytes.
 */
public class PropertiesSerDesUtil {

  private PropertiesSerDesUtil() {
  }

  /**
   * Version of current implementation.
   */
  private static final String CURRENT_VERSION = "0";

  private static final Logger LOG = LoggerFactory.getLogger(PropertiesSerDesUtil.class);

  /**
   * Read properties
   *
   * @param version is the version of {@link PropertiesSerDesUtil}
   */
  public static Map read(byte[] content, String version) {
    Preconditions.checkArgument(CURRENT_VERSION.equals(version),
        "Properties version is not match", version);
    Properties jdkProperties = new Properties();
    try (Reader reader = new InputStreamReader(new ByteArrayInputStream(content), StandardCharsets.UTF_8)) {
      jdkProperties.load(reader);
    } catch (IOException e) {
      LOG.error("Fail to read properties", e);
      throw new UncheckedIOException(e);
    }

    Set propertyNames = jdkProperties.stringPropertyNames();
    Map properties = Maps.newHashMap();
    for (String name : propertyNames) {
      properties.put(name, jdkProperties.getProperty(name));
    }

    return Collections.unmodifiableMap(properties);
  }

  /**
   * Write properties, the version is {@link #currentVersion()}
   */
  public static byte[] toBytes(Map value) {
    Properties jdkProperties = new Properties();
    for (Map.Entry entry : value.entrySet()) {
      jdkProperties.setProperty(entry.getKey(), entry.getValue());
    }

    try (ByteArrayOutputStream output = new ByteArrayOutputStream();
         Writer writer = new OutputStreamWriter(output, StandardCharsets.UTF_8)) {
      jdkProperties.store(writer, null);
      return output.toByteArray();
    } catch (IOException e) {
      LOG.error("Fail to store properties {} to file", value, e);
      throw new UncheckedIOException(e);
    }
  }

  /**
   * Get version of current serializer implementation.
   */
  public static String currentVersion() {
    return CURRENT_VERSION;
  }
}