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package com.bpodgursky.jbool_expressions.rules;

import com.google.common.collect.Lists;
import com.bpodgursky.jbool_expressions.ExprUtil;
import com.bpodgursky.jbool_expressions.Expression;
import com.bpodgursky.jbool_expressions.Or;

import java.util.List;

public class CombineOr extends Rule, K> {

  @Override
  public Expression applyInternal(Or or) {
    for (Expression expr : or.expressions) {
      if (expr instanceof Or) {
        Or childAnd = (Or) expr;

        List> newChildren = Lists.newArrayList();
        ExprUtil.addAll(newChildren, ExprUtil.allExceptMatch(or.expressions, childAnd));
        ExprUtil.addAll(newChildren, childAnd.expressions);

        return Or.of(newChildren);
      }
    }
    return or;
  }

  @Override
  protected boolean isApply(Expression input) {
    return input instanceof Or;
  }

}