// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.
package org.apache.cloudstack.api.command.user.firewall;

import java.util.List;

import org.apache.cloudstack.api.APICommand;
import org.apache.cloudstack.api.ApiConstants;
import org.apache.cloudstack.api.ApiErrorCode;
import org.apache.cloudstack.api.BaseAsyncCmd;
import org.apache.cloudstack.api.BaseAsyncCreateCmd;
import org.apache.cloudstack.api.Parameter;
import org.apache.cloudstack.api.ServerApiException;
import org.apache.cloudstack.api.response.FirewallRuleResponse;
import org.apache.cloudstack.api.response.IPAddressResponse;
import org.apache.cloudstack.api.response.NetworkResponse;
import org.apache.cloudstack.api.response.UserVmResponse;
import org.apache.log4j.Logger;

import com.cloud.async.AsyncJob;
import com.cloud.event.EventTypes;
import com.cloud.exception.InvalidParameterValueException;
import com.cloud.exception.NetworkRuleConflictException;
import com.cloud.exception.ResourceUnavailableException;
import com.cloud.network.IpAddress;
import com.cloud.network.rules.PortForwardingRule;
import com.cloud.user.Account;
import com.cloud.user.UserContext;
import com.cloud.utils.net.Ip;

@APICommand(name = "createPortForwardingRule", description = "Creates a port forwarding rule", responseObject = FirewallRuleResponse.class)
public class CreatePortForwardingRuleCmd extends BaseAsyncCreateCmd implements PortForwardingRule {
    public static final Logger s_logger = Logger.getLogger(CreatePortForwardingRuleCmd.class.getName());

    private static final String s_name = "createportforwardingruleresponse";

    // ///////////////////////////////////////////////////
    // ////////////// API parameters /////////////////////
    // ///////////////////////////////////////////////////

    @Parameter(name = ApiConstants.IP_ADDRESS_ID, type = CommandType.UUID, entityType = IPAddressResponse.class,
            required = true,
    description = "the IP address id of the port forwarding rule")
    private Long ipAddressId;

    @Parameter(name = ApiConstants.PRIVATE_START_PORT, type = CommandType.INTEGER, required = true,
            description = "the starting port of port forwarding rule's private port range")
    private Integer privateStartPort;

    @Parameter(name = ApiConstants.PROTOCOL, type = CommandType.STRING, required = true,
            description = "the protocol for the port fowarding rule. Valid values are TCP or UDP.")
    private String protocol;

    @Parameter(name = ApiConstants.PRIVATE_END_PORT, type = CommandType.INTEGER, required = false, description = "the ending port of port forwarding rule's private port range")
    private Integer privateEndPort;

    @Parameter(name = ApiConstants.PUBLIC_START_PORT, type = CommandType.INTEGER, required = true,
            description = "the starting port of port forwarding rule's public port range")
    private Integer publicStartPort;

    @Parameter(name = ApiConstants.PUBLIC_END_PORT, type = CommandType.INTEGER, required = false, description = "the ending port of port forwarding rule's private port range")
    private Integer publicEndPort;

    @Parameter(name = ApiConstants.VIRTUAL_MACHINE_ID, type = CommandType.UUID, entityType = UserVmResponse.class,
            required = true,
                description = "the ID of the virtual machine for the port forwarding rule")
    private Long virtualMachineId;

    @Parameter(name = ApiConstants.CIDR_LIST, type = CommandType.LIST, collectionType = CommandType.STRING,
            description = "the cidr list to forward traffic from")
    private List<String> cidrlist;

    @Parameter(name = ApiConstants.OPEN_FIREWALL, type = CommandType.BOOLEAN,
            description = "if true, firewall rule for source/end pubic port is automatically created; " +
                    "if false - firewall rule has to be created explicitely. If not specified 1) defaulted to false when PF" +
                    " rule is being created for VPC guest network 2) in all other cases defaulted to true")
    private Boolean openFirewall;

    @Parameter(name=ApiConstants.NETWORK_ID, type=CommandType.UUID, entityType = NetworkResponse.class,
            description="The network of the vm the Port Forwarding rule will be created for. " +
                "Required when public Ip address is not associated with any Guest network yet (VPC case)")
    private Long networkId;
    @Parameter(name = ApiConstants.VM_GUEST_IP, type = CommandType.STRING, required = false,
    description = "VM guest nic Secondary ip address for the port forwarding rule")
    private String vmSecondaryIp;

    // ///////////////////////////////////////////////////
    // ///////////////// Accessors ///////////////////////
    // ///////////////////////////////////////////////////


    public Long getIpAddressId() {
        return ipAddressId;
    }

    public Ip getVmSecondaryIp() {
        if (vmSecondaryIp == null) {
            return null;
        }
        return new Ip(vmSecondaryIp);
    }

    @Override
    public String getProtocol() {
        return protocol.trim();
    }

    @Override
    public long getVirtualMachineId() {
        return virtualMachineId;
    }

    public List<String> getSourceCidrList() {
        if (cidrlist != null) {
            throw new InvalidParameterValueException("Parameter cidrList is deprecated; if you need to open firewall " +
                    "rule for the specific cidr, please refer to createFirewallRule command");
        }
        return null;
    }

    public Boolean getOpenFirewall() {
        boolean isVpc = getVpcId() == null ? false : true;
        if (openFirewall != null) {
            if (isVpc && openFirewall) {
                throw new InvalidParameterValueException("Can't have openFirewall=true when IP address belongs to VPC");
            }
            return openFirewall;
        } else {
            if (isVpc) {
                return false;
            }
            return true;
        }
    }

    private Long getVpcId() {
        if (ipAddressId != null) {
            IpAddress ipAddr = _networkService.getIp(ipAddressId);
            if (ipAddr == null || !ipAddr.readyToUse()) {
                throw new InvalidParameterValueException("Unable to create PF rule, invalid IP address id " + ipAddr.getId());
            } else {
                return ipAddr.getVpcId();
            }
        }
        return null;
    }

    // ///////////////////////////////////////////////////
    // ///////////// API Implementation///////////////////
    // ///////////////////////////////////////////////////

    @Override
    public String getCommandName() {
        return s_name;
    }


    @Override
    public void execute() throws ResourceUnavailableException {
        UserContext callerContext = UserContext.current();
        boolean success = true;
        PortForwardingRule rule = null;
        try {
            UserContext.current().setEventDetails("Rule Id: " + getEntityId());

            if (getOpenFirewall()) {
                success = success && _firewallService.applyIngressFirewallRules(ipAddressId, callerContext.getCaller());
            }

            success = success && _rulesService.applyPortForwardingRules(ipAddressId, callerContext.getCaller());

            // State is different after the rule is applied, so get new object here
            rule = _entityMgr.findById(PortForwardingRule.class, getEntityId());
            FirewallRuleResponse fwResponse = new FirewallRuleResponse();
            if (rule != null) {
                fwResponse = _responseGenerator.createPortForwardingRuleResponse(rule);
                setResponseObject(fwResponse);
            }
            fwResponse.setResponseName(getCommandName());
        } finally {
            if (!success || rule == null) {

                if (getOpenFirewall()) {
                    _firewallService.revokeRelatedFirewallRule(getEntityId(), true);
                }

                try {
                    _rulesService.revokePortForwardingRule(getEntityId(), true);
                } catch (Exception ex){
                    //Ignore e.g. failed to apply rules to device error
                }

                throw new ServerApiException(ApiErrorCode.INTERNAL_ERROR, "Failed to apply port forwarding rule");
            }
        }
    }

    @Override
    public long getId() {
        throw new UnsupportedOperationException("database id can only provided by VO objects");
    }

    @Override
    public String getXid() {
        // FIXME: We should allow for end user to specify Xid.
        return null;
    }


    @Override
    public String getUuid() {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public Long getSourceIpAddressId() {
        return ipAddressId;
    }

    @Override
    public Integer getSourcePortStart() {
        return publicStartPort.intValue();
    }

    @Override
    public Integer getSourcePortEnd() {
        return (publicEndPort == null)? publicStartPort.intValue() : publicEndPort.intValue();
    }

    @Override
    public Purpose getPurpose() {
        return Purpose.PortForwarding;
    }

    @Override
    public State getState() {
        throw new UnsupportedOperationException("Should never call me to find the state");
    }

    @Override
    public long getNetworkId() {
        IpAddress ip = _entityMgr.findById(IpAddress.class, getIpAddressId());
        Long ntwkId = null;

        if (ip.getAssociatedWithNetworkId() != null) {
            ntwkId = ip.getAssociatedWithNetworkId();
        } else {
            ntwkId = networkId;
        }
        if (ntwkId == null) {
            throw new InvalidParameterValueException("Unable to create port forwarding rule for the ipAddress id=" + ipAddressId +
                    " as ip is not associated with any network and no networkId is passed in");
        }
        return ntwkId;
    }

    @Override
    public long getEntityOwnerId() {
        Account account = UserContext.current().getCaller();

        if (account != null) {
            return account.getId();
        }

        return Account.ACCOUNT_ID_SYSTEM; // no account info given, parent this command to SYSTEM so ERROR events are
        // tracked
    }

    @Override
    public long getDomainId() {
        IpAddress ip = _networkService.getIp(ipAddressId);
        return ip.getDomainId();
    }

    @Override
    public Ip getDestinationIpAddress() {
        return null;
    }

    @Override
    public void setDestinationIpAddress(Ip destinationIpAddress) {
        return;
    }

    @Override
    public int getDestinationPortStart() {
        return privateStartPort.intValue();
    }

    @Override
    public int getDestinationPortEnd() {
        return (privateEndPort == null)? privateStartPort.intValue() : privateEndPort.intValue();
    }

    @Override
    public void create() {
        // cidr list parameter is deprecated
        if (cidrlist != null) {
            throw new InvalidParameterValueException("Parameter cidrList is deprecated; if you need to open firewall rule for the specific cidr, please refer to createFirewallRule command");
        }

        Ip privateIp = getVmSecondaryIp();
        if (privateIp != null) {
            if ( !privateIp.isIp4()) {
                throw new InvalidParameterValueException("Invalid vm ip address");
            }
        }

        try {
            PortForwardingRule result = _rulesService.createPortForwardingRule(this, virtualMachineId, privateIp, getOpenFirewall());
            setEntityId(result.getId());
            setEntityUuid(result.getUuid());
        } catch (NetworkRuleConflictException ex) {
            s_logger.info("Network rule conflict: " , ex);
            s_logger.trace("Network Rule Conflict: ", ex);
            throw new ServerApiException(ApiErrorCode.NETWORK_RULE_CONFLICT_ERROR, ex.getMessage());
        }
    }

    @Override
    public String getEventType() {
        return EventTypes.EVENT_NET_RULE_ADD;
    }

    @Override
    public String getEventDescription() {
        IpAddress ip = _networkService.getIp(ipAddressId);
        return ("Applying port forwarding  rule for Ip: " + ip.getAddress() + " with virtual machine:" + virtualMachineId);
    }

    @Override
    public long getAccountId() {
        IpAddress ip = _networkService.getIp(ipAddressId);
        return ip.getAccountId();
    }

    @Override
    public String getSyncObjType() {
        return BaseAsyncCmd.networkSyncObject;
    }

    @Override
    public Long getSyncObjId() {
        return getIp().getAssociatedWithNetworkId();
    }

    private IpAddress getIp() {
        IpAddress ip = _networkService.getIp(ipAddressId);
        if (ip == null) {
            throw new InvalidParameterValueException("Unable to find ip address by id " + ipAddressId);
        }
        return ip;
    }

    @Override
    public Integer getIcmpCode() {
        return null;
    }

    @Override
    public Integer getIcmpType() {
        return null;
    }

    @Override
    public Long getRelated() {
        return null;
    }

    @Override
    public FirewallRuleType getType() {
        return FirewallRuleType.User;
    }

    @Override
    public AsyncJob.Type getInstanceType() {
        return AsyncJob.Type.FirewallRule;
    }

    @Override
    public TrafficType getTrafficType() {
        return null;
    }

}
