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package com.sun.enterprise.admin.util;

import com.sun.enterprise.util.io.DomainDirs;
import com.sun.enterprise.util.io.InstanceDirs;
import com.sun.enterprise.util.io.ServerDirs;
import java.io.File;
import java.io.IOException;
import org.glassfish.api.admin.CommandException;

/**
 * Based on the presence or absence of values for:
 * 
 * domain directory parent (e.g., ${installDir}/domains
 * 
server name (domain or instance)
 * 
node directory
 * 
node name
 * 
 *
 * select the correct directories object for the requested domain or node.
 *
 * @author Byron Nevins
 * @author Tim Quinn (just refactoring, rearranging the code to here)
 */
public class ServerDirsSelector {

    private File userSpecifiedDomainDirParent;
    private String userSpecifiedServerName;
    private String userSpecifiedNodeDir;           // nodeDirRoot
    private String userSpecifiedNode;

    private DomainDirs domainDirs = null;
    private InstanceDirs instanceDirs = null;


    /**
     * Creates a selector for choosing the correct set of directories.
     * @param domainDirParent parent of the domain directory file(s)
     * @param serverName name of the requested instance or domain
     * @param nodeDir path to the node directory
     * @param node name of the node
     * @return
     * @throws CommandException
     * @throws IOException
     */
    public static ServerDirsSelector getInstance(
            final File domainDirParent,
            final String serverName,
            final String nodeDir,
            final String node) throws CommandException, IOException {

        final ServerDirsSelector helper = new ServerDirsSelector(
                domainDirParent,
                serverName,
                nodeDir,
                node);

        helper.validateDomainOrInstance();
        return helper;
    }

    public ServerDirs dirs() {
        return selectDirs();
    }

    private ServerDirsSelector(
            final File domainDirParent,
            final String serverName,
            final String nodeDir,
            final String node) {
        userSpecifiedDomainDirParent = domainDirParent;
        userSpecifiedServerName = serverName;
        userSpecifiedNodeDir = nodeDir;
        userSpecifiedNode = node;
    }


    /**
     * make sure the parameters make sense for either an instance or a domain.
     */
    private void validateDomainOrInstance() throws CommandException, IOException {

        
        // case 1: since ddp is specified - it MUST be a domain
        if (userSpecifiedDomainDirParent != null) {
            domainDirs = new DomainDirs(userSpecifiedDomainDirParent, userSpecifiedServerName);
        }
        //case 2: if either of these are set then it MUST be an instance
        else if (userSpecifiedNode != null || userSpecifiedNodeDir != null) {
            instanceDirs = new InstanceDirs(userSpecifiedNodeDir, userSpecifiedNode, userSpecifiedServerName);
        }
        // case 3: nothing is specified -- use default domain as in v3.0
        else if (userSpecifiedServerName == null) {
            domainDirs = new DomainDirs(userSpecifiedDomainDirParent, userSpecifiedServerName);
        }
        // case 4: userSpecifiedServerName is set and the other 3 are all null
        // we need to figure out if it's a DAS or an instance
        else {
            try {
                domainDirs = new DomainDirs(userSpecifiedDomainDirParent, userSpecifiedServerName);
                return;
            }
            catch (IOException e) {
                // handled below
            }

            instanceDirs = new InstanceDirs(userSpecifiedNodeDir, userSpecifiedNode, userSpecifiedServerName);
        }
    }

    public boolean isInstance() {
        return instanceDirs != null;
    }

    private ServerDirs selectDirs() {
        if (isInstance())
                return instanceDirs.getServerDirs();
            else
                return domainDirs.getServerDirs();
    }
}