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package de.rpgframework.random;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Random;
import java.util.StringTokenizer;

import org.prelle.simplepersist.Attribute;
import org.prelle.simplepersist.Element;
import org.prelle.simplepersist.ElementList;
import org.prelle.simplepersist.Root;

/**
 * @author prelle
 */
@Root(name="rollTable")
public class RollTable {

	/** An identifier within type */
	@Attribute(required=true)
	protected String id;
	@Attribute
	protected int d6;
	@Attribute
	protected int d20;
	@Attribute
	protected int d00;
	@Attribute
	protected String modifiers;
	/** How many results shall be drawn from the table */
	@Attribute
	protected int draw = 1;
	@Attribute
	protected String nextTable;
	@Element
	private AddNodeInstruction addNode;

	@ElementList(entry = "rollResult", type=RollResult.class, inline=true)
	private List results;

	//-------------------------------------------------------------------
	public RollTable() {
		results = new ArrayList<>();
	}

	//-------------------------------------------------------------------
	public RollResult getResultFor(int value) {
		List options = new ArrayList<>();

		for (RollResult result : results) {
			if (result.isInRange(value))
				options.add(result);
		}
		// Select the result - roll again if multiple options
		switch (options.size()) {
		case 0: return null;
		case 1: return options.get(0);
		default:
			return options.get( (new Random()).nextInt(options.size()));
		}
	}

	//-------------------------------------------------------------------
	/**
	 * @return the id
	 */
	public String getId() {
		return id;
	}

	//-------------------------------------------------------------------
	/**
	 * @return the d6
	 */
	public int getD6() {
		return d6;
	}

	//-------------------------------------------------------------------
	public Collection getModifierNames() {
		List ret = new ArrayList<>();
		if (modifiers!=null) {
			StringTokenizer tok = new StringTokenizer(modifiers, ",");
			while (tok.hasMoreTokens()) {
				ret.add( tok.nextToken().trim() );
			}
		}
		return ret;
	}

	//-------------------------------------------------------------------
	/**
	 * @return the results
	 */
	public List getResults() {
		return results;
	}

	//-------------------------------------------------------------------
	/**
	 * @return the nextTable
	 */
	public String getNextTable() {
		return nextTable;
	}

	//-------------------------------------------------------------------
	/**
	 * @return the addNode
	 */
	public AddNodeInstruction getAddNode() {
		return addNode;
	}

}