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package com.bpodgursky.jbool_expressions.rules;

import com.google.common.collect.Lists;
import com.bpodgursky.jbool_expressions.And;
import com.bpodgursky.jbool_expressions.Expression;
import com.bpodgursky.jbool_expressions.Not;
import com.bpodgursky.jbool_expressions.Or;

import java.util.List;

public class DeMorgan extends Rule, K> {

  @Override
  public Expression applyInternal(Not not) {
      Expression e = not.getE();

      if(e instanceof And){
        And internal = (And) e;
        List> morganed = Lists.newArrayList();
        for(Expression expr: internal.expressions){
          morganed.add(Not.of(expr));
        }
        return Or.of(morganed);
      }

      if(e instanceof Or){
        Or internal = (Or) e;
        List> morganed = Lists.newArrayList();
        for(Expression expr: internal.expressions){
          morganed.add(Not.of(expr));
        }
        return And.of(morganed);
      }
    return not;
  }

  @Override
  protected boolean isApply(Expression input) {
    return input instanceof Not;
  }
}