package sega.a7;

import javacard.framework.Util;

/**
 * Ordinal-to-command dispatcher.
 */
public class CommandServer {

    private Command m_ee_noCommand;
    private Command[] m_ee_list;
    private short m_ee_listCount;

    public CommandServer() {
        m_ee_noCommand = null;
        m_ee_list = new Command[4];
        m_ee_listCount = 0;
    }

    public void setNoCommand(Command cmdClass) {
        m_ee_noCommand = cmdClass;
    }

    public void attachCommand(Command cmdClass) {
        if (cmdClass == null) {
            return;
        }
        if (m_ee_listCount >= m_ee_list.length) {
            Command[] tmp = new Command[(short) (m_ee_list.length * 2)];
            for (short i = 0; i < m_ee_list.length; i++) {
                tmp[i] = m_ee_list[i];
            }
            m_ee_list = tmp;
        }
        m_ee_list[m_ee_listCount] = cmdClass;
        m_ee_listCount = (short) (m_ee_listCount + 1);
    }

    public short findCommand(short cmd) {
        for (short i = 0; i < m_ee_listCount; i++) {
            if (cmd == m_ee_list[i].getCmd_ee()) {
                return i;
            }
        }
        return -1;
    }

    public boolean select() {
        boolean ret = true;
        for (short i = 0; i < m_ee_listCount; i++) {
            if (!m_ee_list[i].select()) {
                ret = false;
            }
        }
        return ret;
    }

    public short execute(byte[] data, short dataOffset, short dataLength,
                         byte[] dst, short dstOffset, short dstLength) {
        short cmd = -1;
        if (data != null && dataOffset >= 0 && dataLength >= AppConfig.HEADER_SIZE
                && dataOffset <= (short) (data.length - AppConfig.HEADER_SIZE)) {
            cmd = Util.getShort(data,
                    (short) (dataOffset + AppConfig.CMD_OFFSET));
        }

        short index = findCommand(cmd);
        if (index >= 0) {
            return m_ee_list[index].execute(data, dataOffset, dataLength,
                    dst, dstOffset, dstLength);
        }
        if (m_ee_noCommand != null) {
            return m_ee_noCommand.execute(data, dataOffset, dataLength,
                    dst, dstOffset, dstLength);
        }
        return -1;
    }
}