/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.runtime.exp;

import java.util.ArrayList;

import lucee.runtime.PageContext;
import lucee.runtime.config.ConfigImpl;
import lucee.runtime.type.util.KeyConstants;
import lucee.transformer.library.function.FunctionLib;
import lucee.transformer.library.function.FunctionLibFunction;
import lucee.transformer.library.function.FunctionLibFunctionArg;

/**
 * specified exception for Built-In Function
 */
public final class FunctionException extends ExpressionException {

	/* *
	 * constructor of the class
	 * @param pc current Page Context
	 * @param functionName Name of the function that thorw the Exception
	 * @param badArgumentPosition Position of the bad argument in the Argument List of the function
	 * @param badArgumentName Name of the bad Argument
	 * @param message additional Exception message
	 * /
    public FunctionException(PageContext pc,String functionName, String badArgumentPosition, String badArgumentName, String message) {
        this((PageContext)pc,functionName,badArgumentPosition,badArgumentName,message);
    }*/
	
    /**
     * constructor of the class
     * @param pc current Page Context
     * @param functionName Name of the function that thorw the Exception
     * @param badArgumentPosition Position of the bad argument in the Argument List of the function
     * @param badArgumentName Name of the bad Argument
     * @param message additional Exception message
     */
	public FunctionException(PageContext pc,String functionName, int badArgumentPosition, String badArgumentName, String message) {
        this(pc,functionName,toStringBadArgumentPosition(badArgumentPosition),badArgumentName,message,null);
    }
	
	public FunctionException(PageContext pc,String functionName, int badArgumentPosition, String badArgumentName, String message, String detail) {
        this(pc,functionName,toStringBadArgumentPosition(badArgumentPosition),badArgumentName,message,detail);
    }
	
	private static String toStringBadArgumentPosition(int pos) {
		switch(pos) {
		case 1:return "first";
		case 2:return "second";
		case 3:return "third";
		case 4:return "forth";
		case 5:return "fifth";
		case 6:return "sixth";
		case 7:return "seventh";
		case 8:return "eighth";
		case 9:return "ninth";
		case 10:return "tenth";
		case 11:return "eleventh";
		case 12:return "twelfth";
		}
		// TODO Auto-generated method stub
		return pos+"th";
	}

	public FunctionException(PageContext pc,String functionName, String badArgumentPosition, String badArgumentName, String message, String detail) {
        super("invalid call of the function "+functionName+", "+(badArgumentPosition)+" Argument ("+badArgumentName+") is invalid, "+message,detail);
        setAdditional(KeyConstants._pattern,getFunctionInfo(pc,functionName));
    }
    
	public FunctionException(PageContext pc, String functionName, int min, int max, int actual) {
		super(actual<min?
				"too few arguments ["+actual+"] for "+functionName+" function call, you need at least ["+min+"] arguments"
				:
				"too many arguments ["+actual+"] for "+functionName+" function call, you cannot pass more than ["+max+"] arguments"
				);
	}

	private static String getFunctionInfo(PageContext pc,String functionName) {
		FunctionLib[] flds;
		int dialect=pc.getCurrentTemplateDialect();
        flds = ((ConfigImpl)pc.getConfig()).getFLDs(dialect);
				
		FunctionLibFunction function=null;
		for(int i=0;i<flds.length;i++) {
			function = flds[i].getFunction(functionName.toLowerCase());
			if(function!=null)break;
		}
		if(function == null) return "";
		
		StringBuilder rtn=new StringBuilder();
		rtn.append(function.getName()+"(");
		
		
		int optionals=0;
		ArrayList<FunctionLibFunctionArg> args = function.getArg();
		for(int i=0;i<args.size();i++) {
			FunctionLibFunctionArg arg=args.get(i);
			if(i!=0)rtn.append(", ");
			if(!arg.getRequired()) {
				rtn.append("[");
				optionals++;
			}
			rtn.append(arg.getName());
			rtn.append(":");
			rtn.append(arg.getTypeAsString());
		}
		for(int i=0;i<optionals;i++)
			rtn.append("]");
		rtn.append("):"+function.getReturnTypeAsString());
		
		return rtn.toString();
	}
	


}