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/**
 * Copyright © 2017 Jeremy Custenborder ([email protected])
 *
 * 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 io.confluent.connect.cdc;

import com.google.common.collect.MapDifference;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import java.util.function.Supplier;

public class MapDifferenceSupplier implements Supplier {
  final MapDifference mapDifference;
  final String method;

  public MapDifferenceSupplier(MapDifference mapDifference, String method) {
    this.mapDifference = mapDifference;
    this.method = method;
  }

  @Override
  public String get() {
    try (Writer w = new StringWriter()) {
      try (BufferedWriter writer = new BufferedWriter(w)) {
        writer.append(String.format("Map for actual.%s() does not match expected.%s().", this.method, this.method));
        writer.newLine();
        Map> differences = mapDifference.entriesDiffering();
        if (!differences.isEmpty()) {
          writer.append("Keys with Differences");
          writer.newLine();
          for (Map.Entry> kvp : differences.entrySet()) {
            writer.append("  ");
            writer.append(kvp.getKey().toString());
            writer.newLine();

            writer.append("    expected:");
            writer.append(kvp.getValue().leftValue().toString());
            writer.newLine();

            writer.append("    actual:");
            writer.append(kvp.getValue().rightValue().toString());
            writer.newLine();
          }
        }

        Map entries = mapDifference.entriesOnlyOnLeft();
        writeEntries(writer, "Only in expected map", entries);

        Map onlyInActual = mapDifference.entriesOnlyOnRight();
        writeEntries(writer, "Only in actual map", onlyInActual);
      }
      return w.toString();
    } catch (IOException ex) {
      throw new IllegalStateException(ex);
    }
  }

  private void writeEntries(BufferedWriter writer, String header, Map entries) throws IOException {
    if (!entries.isEmpty()) {
      writer.append(header);
      writer.newLine();

      for (Map.Entry kvp : entries.entrySet()) {
        writer.append("  ");
        writer.append(kvp.getKey().toString());
        writer.append(": ");
        writer.append(kvp.getValue().toString());
        writer.newLine();
      }
      writer.newLine();
    }
  }
}