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/*
 * Created on Dec 11, 2007
 */
package org.wicketstuff.googlecharts;

/**
 * @author Daniel Spiewak
 */
public enum ChartDataEncoding
{

	SIMPLE("s", "", ",")
	{

		@Override
		CharSequence convert(double value, double max)
		{
			if (value < 0)
			{
				return "_";
			}

			value = Math.round((CHARS.length() - 1) * value / max);

			if (value > CHARS.length() - 1)
			{
				throw new IllegalArgumentException(value + " is out of range for SIMPLE encoding");
			}

			return Character.toString(CHARS.charAt((int)value));
		}
	},
	TEXT("t", ",", "|")
	{

		@Override
		CharSequence convert(double value, double max)
		{
			if (value < 0)
			{
				value = -1;
			}

			if (value > 100)
			{
				throw new IllegalArgumentException(value + " is out of range for TEXT encoding");
			}

			return Double.toString(value);
		}
	},
	EXTENDED("e", "", ",")
	{

		@Override
		CharSequence convert(double value, double max)
		{
			if (value < 0)
			{
				return "__";
			}

			value = Math.round(value);

			if (value > (EXT_CHARS.length() - 1) * (EXT_CHARS.length() - 1))
			{
				throw new IllegalArgumentException(value + " is out of range for EXTENDED encoding");
			}

			int rem = (int)(value % EXT_CHARS.length());
			int exp = (int)(value / EXT_CHARS.length());

			return new StringBuilder().append(EXT_CHARS.charAt(exp)).append(EXT_CHARS.charAt(rem));
		}
	};
	private static final String CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
	private static final String EXT_CHARS = CHARS + "-_.";
	private final String rendering, valueSeparator, setSeparator;

	private ChartDataEncoding(String rendering, String valueSeparator, String setSeparator)
	{
		this.rendering = rendering;
		this.valueSeparator = valueSeparator;
		this.setSeparator = setSeparator;
	}

	public String getRendering()
	{
		return rendering;
	}

	public String getValueSeparator()
	{
		return valueSeparator;
	}

	public String getSetSeparator()
	{
		return setSeparator;
	}

	abstract CharSequence convert(double value, double max);
}