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+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed 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.
+# onos common functions
+
+*** Settings ***
+Documentation     Library for various utilities
+Library           SSHLibrary
+Library           String
+Library           DateTime
+Library           Process
+Library           Collections
+Library           RequestsLibrary
+Library           OperatingSystem
+
+*** Keywords ***
+Calculate flows by workflow
+    [Documentation]  Calculate how many flows should be created based on the workflow, the number of UNIs
+    ...     and whether the subscribers have been provisioned
+    [Arguments]  ${workflow}    ${uni_count}    ${olt_count}    ${provisioned}
+    ...     ${withEapol}    ${withDhcp}     ${withIgmp}
+    ${expectedFlows}=   Run Keyword If  $workflow=="att"  Calculate Att flows
+    ...     ${uni_count}    ${olt_count}    ${provisioned}  ${withEapol}    ${withDhcp}     ${withIgmp}
+    ...     ELSE IF     $workflow=="dt"     Calculate Dt Flows
+    ...     ${uni_count}    ${olt_count}    ${provisioned}
+    ...     ELSE IF     $workflow=="tt"     Calculate Tt Flows
+    ...     ${uni_count}    ${olt_count}    ${provisioned}  ${withDhcp}     ${withIgmp}
+    ...     ELSE    Fail    Workflow ${workflow} should be one of 'att', 'dt', 'tt'
+    Return From Keyword     ${expectedFlows}
+
+Calculate Att flows
+    [Documentation]  Calculate the flow for the ATT workflow
+    ...     NOTE we may need to add support for IGMP enabled/disabled
+    [Arguments]  ${uni_count}    ${olt_count}   ${provisioned}      ${withEapol}    ${withDhcp}     ${withIgmp}
+    # (1 EAPOL * ONUs) * (1 LLDP + 1 DHCP * OLTS) before provisioning
+    # (1 EAPOL, 1 DHCP, 1 IGMP, 4 DP * ONUs) * (1 LLDP + 1 DHCP * OLTS) after provisioning
+    ${eapFlowsCount}=   Run Keyword If   $withEapol=='true'
+    ...     Evaluate     1
+    ...     ELSE
+    ...     Evaluate     0
+    ${dhcpFlowsCount}=   Run Keyword If   $withDhcp=='true'
+    ...     Evaluate     1
+    ...     ELSE
+    ...     Evaluate     0
+    ${igmpFlowsCount}=   Run Keyword If   $withIgmp=='true'
+    ...     Evaluate     2
+    ...     ELSE
+    ...     Evaluate     0
+    ${flow_count}=  Run Keyword If  $provisioned=='false'
+    ...     Evaluate    (${uni_count} * ${eapFlowsCount}) + (${olt_count} * 2)
+    ...     ELSE
+    ...     Calculate Att Provisione Flows  ${olt_count}    ${uni_count}
+    ...     ${eapFlowsCount}   ${dhcpFlowsCount}   ${igmpFlowsCount}
+    Return From Keyword     ${flow_count}
+
+Calculate Att Provisione Flows
+    [Documentation]  This calculate the flows for provisioned subscribers in the ATT workflow
+    [Arguments]  ${olt_count}   ${uni_count}    ${eapFlowsCount}   ${dhcpFlowsCount}   ${igmpFlowsCount}
+    ${eap}=     Evaluate    ${uni_count} * ${eapFlowsCount}
+    ${dhcp}=    Evaluate    ${uni_count} * ${dhcpFlowsCount}
+    ${igmp}=    Evaluate    ${uni_count} * ${igmpFlowsCount}
+    ${dataplane}=   Evaluate    ${uni_count} * 4
+    ${nni}=     Evaluate    ${olt_count} * 2
+    ${total}=   Evaluate    ${eap} + ${dhcp} + ${igmp} + ${dataplane} + ${nni}
+    Return From Keyword     ${total}
+
+Calculate Dt flows
+    [Documentation]  Calculate the flow for the DT workflow
+    [Arguments]  ${uni_count}    ${olt_count}   ${provisioned}
+    # (1 LLDP * OLTS) before provisioning
+    # (4 DP * ONUs) * (1 LLDP * OLTS) after provisioning
+    ${flow_count}=  Run Keyword If  $provisioned=='false'
+        ...     Evaluate    (${olt_count} * 1)
+        ...     ELSE
+        ...     Evaluate    (${uni_count} * 4) + (${olt_count} * 1)
+    Return From Keyword     ${flow_count}
+
+Calculate Tt flows
+    [Documentation]  Calculate the flow for the TT workflow
+    [Arguments]  ${uni_count}    ${olt_count}   ${provisioned}  ${withDhcp}     ${withIgmp}
+    # TODO account for withDhcp, withIgmp, see Calculate Att flows for examples
+    # (1 LLDP + 1 DHCP * OLTS) before provisioning
+    # (1 DHCP, 1 IGMP, 4 DP * ONUs) * (1 LLDP + 1 DHCP * OLTS) after provisioning
+    ${flow_count}=  Run Keyword If  $provisioned=='false'
+        ...     Evaluate    (${olt_count} * 2)
+        ...     ELSE
+        ...     Evaluate    (${uni_count} * 6) + (${olt_count} * 1)
+    Return From Keyword     ${flow_count}
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