package bsearch.algorithms;

import java.util.HashMap;
import java.util.List;

import bsearch.util.GeneralUtils;


/**
 * A convenient abstract class to inherit from when making a new SearchMethod.  
 *
 */
public abstract class AbstractSearchMethod implements SearchMethod {

	public boolean supportsAdaptiveSampling()
	{
		return false;
	}

	Double validDoubleParam( HashMap<String , String> searchMethodParams, String pName, double min, double max) throws SearchParameterException
	{
		try {
			double d = Double.valueOf(searchMethodParams.get( pName ));
			if (d < min || d > max) 
			{
				throw new SearchParameterException(getName() + " error: parameter '" + pName + "' should be a number between " + min + " and " + max + ", NOT '" + searchMethodParams.get( pName ) + "'");
			}
			return d;
		} catch (NumberFormatException ex)
		{
			throw new SearchParameterException(getName() + " error: parameter '" + pName + "' should be a number between " + min + " and " + max + ", NOT '" + searchMethodParams.get( pName ) + "'");
		}		
	}
	
	Integer validIntParam( HashMap<String , String> searchMethodParams, String pName, int min, int max) throws SearchParameterException
	{
		try {
			int n = Integer.valueOf(searchMethodParams.get( pName ));
			if (n < min || n > max) 
			{
				throw new SearchParameterException(getName() + " error: parameter '" + pName + "' should be an integer between " + min + " and " + max + ", NOT '" + searchMethodParams.get( pName ) + "'");
			}
			return n;
		} catch (NumberFormatException ex)
		{
			throw new SearchParameterException(getName() + " error: parameter '" + pName + "' should be an integer between " + min + " and " + max + ", NOT '" + searchMethodParams.get( pName ) + "'");
		}		
	}

	String validChoiceParam( HashMap<String , String> searchMethodParams, String pName, List<String> choices) throws SearchParameterException
	{
		String s = searchMethodParams.get( pName );
		if (!choices.contains(s))
		{
			String errorMessage = getName() + " error: parameter '" + pName + "' was given an invalid value: " + s + ".  " + pName + " must be one of the following: ";
			errorMessage += "'" + GeneralUtils.stringJoin(choices,"', '") + "'"; 
			throw new SearchParameterException(errorMessage);
		}
		return s;	
	}

	public String getHTMLHelpText()
	{
		StringBuilder sb = new StringBuilder();
		sb.append(String.format("<HTML><BODY><B>%s:</B> %s", this.getName(), this.getDescription()));
		if (this.getSearchParams().size() > 0)
		{
			sb.append("<UL>");
			
			for (String pname: this.getSearchParamsHelp().keySet())
			{
				sb.append(String.format("<LI><I>%s</I> - %s", pname, this.getSearchParamsHelp().get(pname)));
			}
			sb.append("</UL></BODY></HTML>");
		}		
		return sb.toString();
	}

	
}