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/*
 * Copyright © 2016-2017 European Support Limited
 *
 * 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.
 */
package org.openecomp.sdc.validation.impl.validators.heatresource;

import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import org.openecomp.core.validation.ErrorMessageCode;
import org.openecomp.core.validation.errors.ErrorMessagesFormatBuilder;
import org.openecomp.core.validation.types.GlobalValidationContext;
import org.openecomp.sdc.datatypes.error.ErrorLevel;
import org.openecomp.sdc.heat.datatypes.model.Resource;
import org.openecomp.sdc.heat.services.HeatConstants;
import org.openecomp.sdc.validation.ResourceValidator;
import org.openecomp.sdc.validation.ValidationContext;
import org.openecomp.sdc.validation.impl.util.HeatValidationService;
import org.openecomp.sdc.validation.type.HeatResourceValidationContext;

public class VirtualMachineInterfaceValidator implements ResourceValidator {

    private static final ErrorMessageCode ERROR_CODE_VLAN1 = new ErrorMessageCode("VLAN1");
    private static final ErrorMessageCode ERROR_CODE_VLAN2 = new ErrorMessageCode("VLAN2");

    @Override
    public void validate(String fileName, Map.Entry<String, Resource> resourceEntry, GlobalValidationContext globalContext,
                         ValidationContext validationContext) {
        HeatResourceValidationContext heatResourceValidationContext = (HeatResourceValidationContext) validationContext;
        final ValidityStatus status = calculateValidityStatus(resourceEntry.getValue());
        switch (status) {
            case BOTH_PROPERTIES_PRESENT:
                validateHasSingleParentPort(fileName, resourceEntry, globalContext, heatResourceValidationContext);
                break;
            case REFS_PROPERTY_MISSING:
                globalContext.addMessage(fileName, ErrorLevel.WARNING, ErrorMessagesFormatBuilder
                    .getErrorWithParameters(ERROR_CODE_VLAN2, Messages.VLAN_SUBINTERFACE_MISSING_REFS_PROPERTY.getErrorMessage(),
                        resourceEntry.getKey()));
                break;
            case VLAN_TAG_PROPERTY_MISSING:
                globalContext.addMessage(fileName, ErrorLevel.WARNING, ErrorMessagesFormatBuilder
                    .getErrorWithParameters(ERROR_CODE_VLAN2, Messages.VLAN_SUBINTERFACE_MISSING_TAG_PROPERTY.getErrorMessage(),
                        resourceEntry.getKey()));
                validateHasSingleParentPort(fileName, resourceEntry, globalContext, heatResourceValidationContext);
                break;
            case BOTH_PROPERTIES_MISSING:
                // this is a port and not a VLAN, no further validation required
                break;
            default:
                throw new IllegalArgumentException("Received a value for which no handling is " + "available " + status);
        }
    }

    private ValidityStatus calculateValidityStatus(Resource resource) {
        Optional<Object> refsPropertyValue = getRefsPropertyValue(resource);
        Optional<Object> tagPropertyValue = getVlanTagPropertyValue(resource);
        if (refsPropertyValue.isPresent() && tagPropertyValue.isPresent()) {
            return ValidityStatus.BOTH_PROPERTIES_PRESENT;
        }
        if (!refsPropertyValue.isPresent() && !tagPropertyValue.isPresent()) {
            return ValidityStatus.BOTH_PROPERTIES_MISSING;
        }
        return refsPropertyValue.map(o -> ValidityStatus.VLAN_TAG_PROPERTY_MISSING).orElse(ValidityStatus.REFS_PROPERTY_MISSING);
    }

    private void validateHasSingleParentPort(String fileName, Map.Entry<String, Resource> resourceEntry, GlobalValidationContext globalContext,
                                             HeatResourceValidationContext heatResourceValidationContext) {
        Object refsPropertyValue = resourceEntry.getValue().getProperties().get(HeatConstants.VMI_REFS_PROPERTY_NAME);
        if (Objects.isNull(refsPropertyValue)) {
            return;
        }
        boolean hasSingleParentPort = HeatValidationService
            .hasSingleParentPort(fileName, globalContext, heatResourceValidationContext, refsPropertyValue);
        if (!hasSingleParentPort) {
            globalContext.addMessage(fileName, ErrorLevel.ERROR, ErrorMessagesFormatBuilder
                .getErrorWithParameters(ERROR_CODE_VLAN1, Messages.VLAN_SUBINTERFACE_MORE_THAN_ONE_PORT.getErrorMessage(), resourceEntry.getKey()));
        }
    }

    private Optional<Object> getVlanTagPropertyValue(Resource resource) {
        Object vmiProperties = resource.getProperties().get(HeatConstants.VMI_PROPERTIES_PROPERTY_NAME);
        if (Objects.nonNull(vmiProperties) && vmiProperties instanceof Map) {
            return Optional.ofNullable(((Map) vmiProperties).get(HeatConstants.VMI_SUB_INTERFACE_VLAN_TAG_PROPERTY_NAME));
        }
        return Optional.empty();
    }

    private Optional<Object> getRefsPropertyValue(Resource resource) {
        Object refsProperty = resource.getProperties().get(HeatConstants.VMI_REFS_PROPERTY_NAME);
        return Optional.ofNullable(refsProperty);
    }

    private enum ValidityStatus {BOTH_PROPERTIES_MISSING, BOTH_PROPERTIES_PRESENT, REFS_PROPERTY_MISSING, VLAN_TAG_PROPERTY_MISSING}

    private enum Messages {
        // @formatter:off
        VLAN_SUBINTERFACE_MORE_THAN_ONE_PORT("More than one parent port found, there should be only one parent port for "
            + "a VLAN sub-interface ID [%s]"),
        VLAN_SUBINTERFACE_MISSING_TAG_PROPERTY("VLAN Tag property virtual_machine_interface_properties_sub_interface_vlan_tag is missing "
            + "in VLAN Resource ID [%s]"),
        VLAN_SUBINTERFACE_MISSING_REFS_PROPERTY("Parent port property virtual_machine_interface_refs is missing in VLAN Resource ID [%s]");
        // @formatter:on

        private final String errorMessage;

        Messages(String errorMessage) {
            this.errorMessage = errorMessage;
        }

        String getErrorMessage() {
            return errorMessage;
        }
    }
}