/*
 * Copyright (c) 2006-2010 Citrix Systems, Inc.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as published
 * by the Free Software Foundation, with the additional linking exception as
 * follows:
 * 
 *   Linking this library statically or dynamically with other modules is
 *   making a combined work based on this library. Thus, the terms and
 *   conditions of the GNU General Public License cover the whole combination.
 * 
 *   As a special exception, the copyright holders of this library give you
 *   permission to link this library with independent modules to produce an
 *   executable, regardless of the license terms of these independent modules,
 *   and to copy and distribute the resulting executable under terms of your
 *   choice, provided that you also meet, for each linked independent module,
 *   the terms and conditions of the license of that module. An independent
 *   module is a module which is not derived from or based on this library. If
 *   you modify this library, you may extend this exception to your version of
 *   the library, but you are not obligated to do so. If you do not wish to do
 *   so, delete this exception statement from your version.
 * 
 * This program 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 General Public License for
 * more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

package com.xensource.xenapi;

import com.xensource.xenapi.Types.BadServerResponse;
import com.xensource.xenapi.Types.VersionException;
import com.xensource.xenapi.Types.XenAPIException;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.Map;
import java.util.Set;

import org.apache.xmlrpc.XmlRpcException;

/**
 * A user or group that can log in xapi
 *
 * @author Citrix Systems, Inc.
 */
public class Subject extends XenAPIObject {

    /**
     * The XenAPI reference to this object.
     */
    protected final String ref;

    /**
     * For internal use only.
     */
    Subject(String ref) {
       this.ref = ref;
    }

    public String toWireString() {
       return this.ref;
    }

    /**
     * If obj is a Subject, compares XenAPI references for equality.
     */
    @Override
    public boolean equals(Object obj)
    {
        if (obj != null && obj instanceof Subject)
        {
            Subject other = (Subject) obj;
            return other.ref.equals(this.ref);
        } else
        {
            return false;
        }
    }

    @Override
    public int hashCode()
    {
        return ref.hashCode();
    }

    /**
     * Represents all the fields in a Subject
     */
    public static class Record implements Types.Record {
        public String toString() {
            StringWriter writer = new StringWriter();
            PrintWriter print = new PrintWriter(writer);
            print.printf("%1$20s: %2$s\n", "uuid", this.uuid);
            print.printf("%1$20s: %2$s\n", "subjectIdentifier", this.subjectIdentifier);
            print.printf("%1$20s: %2$s\n", "otherConfig", this.otherConfig);
            print.printf("%1$20s: %2$s\n", "roles", this.roles);
            return writer.toString();
        }

        /**
         * Convert a subject.Record to a Map
         */
        public Map<String,Object> toMap() {
            Map<String,Object> map = new HashMap<String,Object>();
            map.put("uuid", this.uuid == null ? "" : this.uuid);
            map.put("subject_identifier", this.subjectIdentifier == null ? "" : this.subjectIdentifier);
            map.put("other_config", this.otherConfig == null ? new HashMap<String, String>() : this.otherConfig);
            map.put("roles", this.roles == null ? new LinkedHashSet<Role>() : this.roles);
            return map;
        }

        /**
         * unique identifier/object reference
         */
        public String uuid;
        /**
         * the subject identifier, unique in the external directory service
         */
        public String subjectIdentifier;
        /**
         * additional configuration
         */
        public Map<String, String> otherConfig;
        /**
         * the roles associated with this subject
         */
        public Set<Role> roles;
    }

    /**
     * Get a record containing the current state of the given subject.
     *
     * @return all fields from the object
     */
    public Subject.Record getRecord(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_record";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSubjectRecord(result);
    }

    /**
     * Get a reference to the subject instance with the specified UUID.
     *
     * @param uuid UUID of object to return
     * @return reference to the object
     */
    public static Subject getByUuid(Connection c, String uuid) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_by_uuid";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(uuid)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSubject(result);
    }

    /**
     * Create a new subject instance, and return its handle.
     *
     * @param record All constructor arguments
     * @return Task
     */
    public static Task createAsync(Connection c, Subject.Record record) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "Async.subject.create";
        String session = c.getSessionReference();
        Map<String, Object> record_map = record.toMap();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(record_map)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
        return Types.toTask(result);
    }

    /**
     * Create a new subject instance, and return its handle.
     *
     * @param record All constructor arguments
     * @return reference to the newly created object
     */
    public static Subject create(Connection c, Subject.Record record) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.create";
        String session = c.getSessionReference();
        Map<String, Object> record_map = record.toMap();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(record_map)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSubject(result);
    }

    /**
     * Destroy the specified subject instance.
     *
     * @return Task
     */
    public Task destroyAsync(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "Async.subject.destroy";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
        return Types.toTask(result);
    }

    /**
     * Destroy the specified subject instance.
     *
     */
    public void destroy(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.destroy";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        return;
    }

    /**
     * Get the uuid field of the given subject.
     *
     * @return value of the field
     */
    public String getUuid(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_uuid";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toString(result);
    }

    /**
     * Get the subject_identifier field of the given subject.
     *
     * @return value of the field
     */
    public String getSubjectIdentifier(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_subject_identifier";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toString(result);
    }

    /**
     * Get the other_config field of the given subject.
     *
     * @return value of the field
     */
    public Map<String, String> getOtherConfig(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_other_config";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toMapOfStringString(result);
    }

    /**
     * Get the roles field of the given subject.
     *
     * @return value of the field
     */
    public Set<Role> getRoles(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_roles";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSetOfRole(result);
    }

    /**
     * This call adds a new role to a subject
     *
     * @param role The unique role reference
     */
    public void addToRoles(Connection c, Role role) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.add_to_roles";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref), Marshalling.toXMLRPC(role)};
        Map response = c.dispatch(method_call, method_params);
        return;
    }

    /**
     * This call removes a role from a subject
     *
     * @param role The unique role reference in the subject's roles field
     */
    public void removeFromRoles(Connection c, Role role) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.remove_from_roles";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref), Marshalling.toXMLRPC(role)};
        Map response = c.dispatch(method_call, method_params);
        return;
    }

    /**
     * This call returns a list of permission names given a subject
     *
     * @return a list of permission names
     */
    public Set<String> getPermissionsNameLabel(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_permissions_name_label";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session), Marshalling.toXMLRPC(this.ref)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSetOfString(result);
    }

    /**
     * Return a list of all the subjects known to the system.
     *
     * @return references to all objects
     */
    public static Set<Subject> getAll(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_all";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toSetOfSubject(result);
    }

    /**
     * Return a map of subject references to subject records for all subjects known to the system.
     *
     * @return records of all objects
     */
    public static Map<Subject, Subject.Record> getAllRecords(Connection c) throws
       BadServerResponse,
       XenAPIException,
       XmlRpcException {
        String method_call = "subject.get_all_records";
        String session = c.getSessionReference();
        Object[] method_params = {Marshalling.toXMLRPC(session)};
        Map response = c.dispatch(method_call, method_params);
        Object result = response.get("Value");
            return Types.toMapOfSubjectSubjectRecord(result);
    }

}