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/*
Copyright 2019 FZI Forschungszentrum Informatik

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.streampipes.manager.selector;

import org.streampipes.model.SpDataStream;
import org.streampipes.model.constants.PropertySelectorConstants;
import org.streampipes.model.schema.EventProperty;

import java.util.List;

public class PropertyRequirementSelector {

  private String requirementSelector;

  public PropertyRequirementSelector(String requirementSelector) {
    this.requirementSelector = requirementSelector;
  }

  public EventProperty findPropertyRequirement(List streamRequirements) throws
          IllegalArgumentException {
    SpDataStream affectedStream = getAffectedStream(streamRequirements);
    for (EventProperty property : affectedStream.getEventSchema().getEventProperties()) {
      if (makePropertySelector(property.getRuntimeName()).equals(requirementSelector)) {
        return property;
      }
    }

    throw new IllegalArgumentException("Could not find requirement as specified by selector.");
  }

  private String makePropertySelector(String runtimeName) {
    return getAffectedRequirementPrefix() + PropertySelectorConstants.PROPERTY_DELIMITER +runtimeName;
  }

  public SpDataStream getAffectedStream(List streams) {
    Integer affectedStreamIndex = getAffectedStreamIndex();

    if (affectedStreamIndex == 0) {
      return streams.get(0);
    } else if (affectedStreamIndex == 1 && streams.size() > 1) {
      return streams.get(1);
    } else {
      throw new IllegalArgumentException("Wrong requirement selector provided.");
    }
  }

  private Integer getAffectedStreamIndex() {
    if (requirementSelector.startsWith(PropertySelectorConstants.FIRST_REQUIREMENT_PREFIX)) {
      return 0;
    } else {
      return 1;
    }
  }

  private String getAffectedRequirementPrefix() {
    Integer affectedStreamIndex = getAffectedStreamIndex();
    if (affectedStreamIndex == 0) {
      return PropertySelectorConstants.FIRST_REQUIREMENT_PREFIX;
    } else {
      return PropertySelectorConstants.SECOND_REQUIREMENT_PREFIX;
    }
  }

  public String getAffectedStreamPrefix() {
    Integer affectedStreamIndex = getAffectedStreamIndex();
    if (affectedStreamIndex == 0) {
      return PropertySelectorConstants.FIRST_STREAM_ID_PREFIX;
    } else {
      return PropertySelectorConstants.SECOND_STREAM_ID_PREFIX;
    }
  }
}