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package consulting.omnia.util.cast.number;

import java.math.BigDecimal;
import java.util.Date;

import consulting.omnia.util.cast.visitor.AbstractCastMainDataVisitor;

/**
 * Casts data asNumber and Number asType.
 * 
 * @author Ronaldo Blanc ronaldoblanc at omnia.consulting
 * @since Sep 19, 2015
 * @version 1.2.0
 */
public class NumberCast {

	private static final NumberCastMainDataVisitor NUMBER_CAST_VISITOR = new NumberCast.NumberCastMainDataVisitor();
	
	/**
	 * @param value Data to cast
	 * @param type Type to cast to
	 * @param  Type to cast to
	 * @return Number of type R
	 */
	public static  R asNumber(final Object value, final Class type) {
		return NUMBER_CAST_VISITOR.asNumber(value, type);
	}
	
	/**
	 * @param value Number to cast
	 * @param type Type to cast to
	 * @param  Type to cast to
	 * @return
	 */
	public static  R asType(final Number value, final Class type) {
		return NUMBER_CAST_VISITOR.asType(value, type);
	}
	
	/**
	 * Visitor like implementation of a numeric cast tool.
	 * @author Ronaldo Blanc ronaldoblanc at omnia.consulting
	 * @since Sep 19, 2015
	 * @version 1.0.0
	 */
	private static class NumberCastMainDataVisitor extends AbstractCastMainDataVisitor {
		private BigDecimal number;
		private Object result;

		public  R asNumber(final Object value, final Class type) {
			accept(value);
			return NumberBigDecimalCast.bigDecimalToNumber(number, type);
		}

		public  R asType(final Number value, final Class type) {
			result = value;
			accept(type);
			return castAs(result, type);
		}

		@Override
		public void visit(final Character value) {
			number = new BigDecimal(castAs(value, Character.class).toString());
		}

		@Override
		public void visit(final String value) {
			number = new BigDecimal(castAs(value, String.class));
		}

		@Override
		public void visit(final Date value) {
			number = NumberBigDecimalCast.numberToBigDecimal(castAs(value,
					Date.class).getTime());
		}

		@Override
		public void visit(final Boolean value) {
			number = castAs(value, Boolean.class) == Boolean.TRUE ? BigDecimal.ONE
					: BigDecimal.ZERO;
		}

		@Override
		public void visit(final Number value) {
			number = NumberBigDecimalCast.numberToBigDecimal(castAs(value,
					Number.class));
		}

		@Override
		public void visit(Class type) {
			if (String.class.isAssignableFrom(type)) {
				result = String.valueOf(result);
			}

			if (Date.class.isAssignableFrom(type)) {
				result = new Date(castAs(result, Number.class).longValue());
			}

			if (Boolean.class.isAssignableFrom(type)) {
				result = (castAs(result, Number.class).byteValue() == 1);
			}
			
			if (Number.class.isAssignableFrom(type)) {
				result = NumberBigDecimalCast.numberToBigDecimal(castAs(result,Number.class));
				result = asNumber(result, type);
			}
		}
	}

}