/**
 *  Copyright (C) 2010 Cloud.com, Inc.  All rights reserved.
 * 
 * This software is licensed under the GNU General Public License v3 or later.
 * 
 * It is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or any later 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, see <http://www.gnu.org/licenses/>.
 * 
 */

package com.cloud.vm;

import java.util.Date;
import java.util.Random;

import javax.persistence.Column;
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.Id;
import javax.persistence.Inheritance;
import javax.persistence.InheritanceType;
import javax.persistence.Table;
import javax.persistence.TableGenerator;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import com.cloud.hypervisor.Hypervisor.HypervisorType;
import com.cloud.utils.db.GenericDao;
import com.cloud.utils.db.StateMachine;
import com.cloud.utils.fsm.FiniteStateObject;
import com.cloud.utils.fsm.StateObject;
import com.cloud.vm.VirtualMachine.State;

@Entity
@Table(name="vm_instance")
@Inheritance(strategy=InheritanceType.JOINED)
@DiscriminatorColumn(name="type", discriminatorType=DiscriminatorType.STRING, length=32)
public class VMInstanceVO implements VirtualMachine, FiniteStateObject<State, VirtualMachine.Event>, StateObject<State> {
    @Id
    @TableGenerator(name="vm_instance_sq", table="sequence", pkColumnName="name", valueColumnName="value", pkColumnValue="vm_instance_seq", allocationSize=1)
    @Column(name="id", updatable=false, nullable = false)
	protected long id;

    @Column(name="name", updatable=false, nullable=false, length=255)
	protected String name = null;

    @Column(name="vnc_password", updatable=true, nullable=false, length=255)
    protected String vncPassword;
    
    @Column(name="proxy_id", updatable=true, nullable=true)
    protected Long proxyId;
    
    @Temporal(TemporalType.TIMESTAMP)
    @Column(name="proxy_assign_time", updatable=true, nullable=true)
    protected Date proxyAssignTime;

    /**
     * Note that state is intentionally missing the setter.  Any updates to
     * the state machine needs to go through the DAO object because someone
     * else could be updating it as well.
     */
    @Enumerated(value=EnumType.STRING)
    @StateMachine(state=State.class, event=Event.class)
    @Column(name="state", updatable=true, nullable=false, length=32)
    protected State state = null;

    @Column(name="private_ip_address", updatable=true)
	protected String privateIpAddress;

    @Column(name="instance_name", updatable=true, nullable=false)
    protected String instanceName;

    @Column(name="vm_template_id", updatable=false, nullable=true, length=17)
	protected Long templateId = new Long(-1);

    @Column(name="guest_os_id", nullable=false, length=17)
    protected long guestOSId;
    
    @Column(name="host_id", updatable=true, nullable=true)
	protected Long hostId;
    
    @Column(name="last_host_id", updatable=true, nullable=true)
    protected Long lastHostId;

    @Column(name="pod_id", updatable=true, nullable=false)
    protected Long podId;

    @Column(name="private_mac_address", updatable=true, nullable=true)
    protected String privateMacAddress;

    @Column(name="data_center_id", updatable=true, nullable=false)
    protected long dataCenterId;

    @Column(name="type", updatable=false, nullable=false, length=32)
    @Enumerated(value=EnumType.STRING)
    protected Type type;

    @Column(name="ha_enabled", updatable=true, nullable=true)
    protected boolean haEnabled;
    
    @Column(name="update_count", updatable = true, nullable=false)
    protected long updated;	// This field should be updated everytime the state is updated.  There's no set method in the vo object because it is done with in the dao code.
    
    @Column(name=GenericDao.CREATED_COLUMN)
    protected Date created;
    
    @Column(name=GenericDao.REMOVED_COLUMN)
    protected Date removed;
    
    @Column(name="update_time", updatable=true)
    @Temporal(value=TemporalType.TIMESTAMP)
    protected Date updateTime;
    
    @Column(name="domain_id")
    protected long domainId;
    
    @Column(name="account_id")
    protected long accountId;
    
    @Column(name="service_offering_id")
    protected long serviceOfferingId;
    
    @Column(name="reservation_id")
    protected String reservationId;
    
    @Column(name="hypervisor_type")
    @Enumerated(value=EnumType.STRING) 
    protected HypervisorType hypervisorType;
    
    public VMInstanceVO(long id,
                        long serviceOfferingId,
                        String name,
                        String instanceName,
                        Type type,
                        Long vmTemplateId,
                        HypervisorType hypervisorType,
                        long guestOSId,
                        long domainId,
                        long accountId,
                        boolean haEnabled) {
        this.id = id;
        this.name = name;
        if (vmTemplateId != null) {
            this.templateId = vmTemplateId;
        }
        this.instanceName = instanceName;
        this.type = type;
        this.guestOSId = guestOSId;
        this.haEnabled = haEnabled;
        this.vncPassword = Long.toHexString(new Random().nextLong());
        this.state = State.Stopped;
        this.accountId = accountId;
        this.domainId = domainId;
        this.serviceOfferingId = serviceOfferingId;
        this.hypervisorType = hypervisorType;
    }
	
    protected VMInstanceVO() {
    }
    
    public Date getRemoved() {
    	return removed;
    }
    
    @Override
    public long getDomainId() {
        return domainId;
    }
    
    @Override
    public long getAccountId() {
        return accountId;
    }
    
    @Override
    public Type getType() {
        return type;
    }
    
    public long getUpdated() {
    	return updated;
    }
    
	@Override
    public long getId() {
		return id;
	}
	
	@Override
    public HypervisorType getHypervisorType() {
	    return hypervisorType;
	}
	
	@Override
    public Date getCreated() {
		return created;
	}
	
	public Date getUpdateTime() {
		return updateTime;
	}
	
	@Override
    public long getDataCenterId() {
	    return dataCenterId;
	}
	
	@Override
	public String getName() {
		return name;
	}
	
	@Override
	public String getInstanceName() {
	    return instanceName;
	}
	
	public void setInstanceName(String instanceName) {
	    this.instanceName = instanceName;
	}
	
	@Override
	public State getState() {
		return state;
	}
	
	// don't use this directly, use VM state machine instead, this method is added for migration tool only
	@Override
    public void setState(State state) {
		this.state = state;
	}
	
	@Override
	public String getPrivateIpAddress() {
		return privateIpAddress;
	}
	
	public void setPrivateIpAddress(String address) {
		privateIpAddress = address;
	}
    
    public void setVncPassword(String vncPassword) {
        this.vncPassword = vncPassword;
    }
    
    @Override
    public String getVncPassword() {
        return vncPassword;
    }
    
    @Override
    public long getServiceOfferingId() {
        return serviceOfferingId;
    }
    
	public Long getProxyId() {
    	return proxyId;
    }
    
    public void setProxyId(Long proxyId) {
    	this.proxyId = proxyId;
    }
    
    public Date getProxyAssignTime() {
    	return this.proxyAssignTime;
    }
    
    public void setProxyAssignTime(Date time) {
    	this.proxyAssignTime = time;
    }
	
	@Override
	public long getTemplateId() {
		if (templateId == null) {
            return -1;
        } else {
            return templateId;
        }
	}
	
	public void setTemplateId(Long templateId) {
		this.templateId = templateId;
	}

	@Override
    public long getGuestOSId() {
		return guestOSId;
	}
	
	public void setGuestOSId(long guestOSId) {
		this.guestOSId = guestOSId;
	}

	public void incrUpdated() {
		updated++;
	}

	@Override
	public Long getHostId() {
		return hostId;
	}
	
	@Override
	public Long getLastHostId() {
		return lastHostId;
	}
	
	public void setLastHostId(Long lastHostId) {
		this.lastHostId = lastHostId;
	}
	
	public void setHostId(Long hostId) {
		this.hostId = hostId;
	}
	
    @Override
    public boolean isHaEnabled() {
        return haEnabled;
    }

    @Override
    public String getPrivateMacAddress() {
        return privateMacAddress;
    }

    @Override
    public Long getPodId() {
        return podId;
    }
    
    public void setPodId(long podId) {
        this.podId = podId;
    }

    public void setPrivateMacAddress(String privateMacAddress) {
        this.privateMacAddress = privateMacAddress;
    }

    public void setDataCenterId(long dataCenterId) {
        this.dataCenterId = dataCenterId;
    }
    
    public boolean isRemoved() {
        return removed != null;
    }
    
    public void setHaEnabled(boolean value) {
        haEnabled = value;
    }

	public void setReservationId(String reservationId) {
	    this.reservationId = reservationId;
	}
	
	public String getReservationId() {
	    return this.reservationId;
	}

	transient String toString;
    @Override
	public String toString() {
        if (toString == null) {
            toString = new StringBuilder("VM[").append(type.toString()).append("|").append(instanceName).append("]").toString();
        }
        return toString;
    }
}