package com.onaro.sanscreen.client.view.task.template.addhost.generator.host;

import com.onaro.sanscreen.client.view.task.template.addhost.generator.AddHostGeneratorModel;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;

public abstract class AbstractPortColumn implements ColumnModel {

    protected AddHostGeneratorModel generatorModel;

    /**
     * Maps a row number to the index of a port and its adapter. <code>null</code> value represents a row
     * that is mapped to an adapter, not to a port.
     */
    private PortIndex[] rowToPort;

    public AbstractPortColumn(AddHostGeneratorModel generatorModel) {
        this.generatorModel = generatorModel;

        generatorModel.addPropertyChangeListener(AddHostGeneratorModel.HOST_CONFIGURATION, new PropertyChangeListener() {
            public void propertyChange(PropertyChangeEvent evt) {
                rowToPort = null;
            }
        });
    }

    public boolean isCellEditable(int rowIndex) {
        return getPortIndexByRow(rowIndex) != null;
    }

    public abstract Object getPortValue(int adapterIndex,int portIndex);

    public final Object getValueAt(int rowIndex) {
        PortIndex portIndex = getPortIndexByRow(rowIndex);
        if (portIndex == null) return NO_VALUE;
        return getPortValue(portIndex.adapter, portIndex.port);
    }

    public abstract void setPortValue(Object aValue, int adapterIndex,int portIndex);

    public final void setValueAt(Object aValue, int rowIndex) {
        PortIndex portIndex = getPortIndexByRow(rowIndex);
        assert portIndex != null : "Cannot set WWN to row " + rowIndex + " because it's not a port"; //$NON-NLS-1$ //$NON-NLS-2$
        setPortValue(aValue, portIndex.adapter, portIndex.port);
    }

    protected PortIndex getPortIndexByRow(int rowIndex) {
        if (rowToPort == null) {
            rowToPort = new PortIndex[generatorModel.getAdaperAndPortsCount()];
            int row = 0;
            for (int adapterIndex = 0; adapterIndex < generatorModel.getAdapterCount(); ++adapterIndex) {
                rowToPort[row++] = null;

                Adapter adapter = generatorModel.getAdapter(adapterIndex);
                for (int portIndex = 0; portIndex < adapter.getPortsCount(); ++portIndex) {
                    rowToPort[row++] = new PortIndex(adapterIndex, portIndex);
                }
            }
        }

        return rowToPort[rowIndex];
    }

    static class PortIndex {
        int adapter;
        int port;

        public PortIndex(int adapter, int port) {
            this.adapter = adapter;
            this.port = port;
        }
    }
}