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package nl.weeaboo.lua2.vm;

import static nl.weeaboo.lua2.vm.LuaConstants.NONE;

import java.io.Serializable;

import nl.weeaboo.lua2.io.LuaSerializable;

/**
 * Varargs implemenation backed by an array of LuaValues
 * 
 * This is an internal class not intended to be used directly. Instead use
 * the corresponding static methods on LuaValue.
 *
 * @see LuaValue#varargsOf(LuaValue[], int, int)
 * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
 */
@LuaSerializable
final class ArrayPartVarargs extends Varargs implements Serializable {

    private static final long serialVersionUID = 5311707858805030821L;

    private final int offset;
    private final LuaValue[] v;
    private final int length;
    private final Varargs more;

    /**
     * Construct a Varargs from an array of LuaValue.
     * 

     * This is an internal class not intended to be used directly. Instead
     * use the corresponding static methods on LuaValue.
     *
     * @see LuaValue#varargsOf(LuaValue[], int, int)
     */
    ArrayPartVarargs(LuaValue[] v, int offset, int length) {
        this.v = v;
        this.offset = offset;
        this.length = length;
        this.more = NONE;
    }

    /**
     * Construct a Varargs from an array of LuaValue and additional
     * arguments.
     * 
     * This is an internal class not intended to be used directly. Instead
     * use the corresponding static method on LuaValue.
     *
     * @see LuaValue#varargsOf(LuaValue[], int, int, Varargs)
     */
    public ArrayPartVarargs(LuaValue[] v, int offset, int length, Varargs more) {
        this.v = v;
        this.offset = offset;
        this.length = length;
        this.more = more;
    }

    @Override
    public LuaValue arg(int i) {
        return i >= 1 && i <= length ? v[i + offset - 1] : more.arg(i - length);
    }

    @Override
    public int narg() {
        return length + more.narg();
    }

    @Override
    public LuaValue arg1() {
        return length > 0 ? v[offset] : more.arg1();
    }
}