package org.matheclipse.core.form.mathml.reflection;

import org.matheclipse.core.convert.AST2Expr;
import org.matheclipse.core.form.mathml.AbstractConverter;
import org.matheclipse.core.interfaces.IAST;

public class Sum extends AbstractConverter {

  public Sum() {
  }

  /**
   * Converts a given function into the corresponding MathML output
   *
   *@param  buf  StringBuffer for MathML output
   *@param  f    The math function which should be converted to MathML
   */
  public boolean convert(final StringBuffer buf, final IAST f, final int precedence) {
    if (f.size() >= 3) {
      for (int i = 2; i < f.size(); i++) {
				fFactory.tagStart(buf, "mrow");
        if ((f.get(i) instanceof IAST) && ((IAST) f.get(i)).head().toString().equals(AST2Expr.LIST_STRING)) {
          final IAST list = (IAST) f.get(i);
          fFactory.tagStart(buf, "munderover");
          // ∑ ∑
          fFactory.tag(buf, "mo", "∑");

          fFactory.tagStart(buf, "mrow");
          if (list.size() > 1) {
            fFactory.convert(buf, list.get(1), 0);
          }
          if (list.size() > 2) {
            fFactory.tag(buf, "mo", "=");
            fFactory.convert(buf, list.get(2), 0);
            fFactory.tagEnd(buf, "mrow");
          }
          if (list.size() > 3) {
            fFactory.convert(buf, list.get(3), 0);
          }
          fFactory.tagEnd(buf, "munderover");
        } else {
          return false;
        }
      }
      fFactory.convert(buf, f.get(1), 0);
      for (int i = 2; i < f.size(); i++) {
				fFactory.tagEnd(buf, "mrow");
      }
      return true;
    }
    return false;
  }

}