/*
 *  ============LICENSE_START=======================================================
 *  Copyright (C) 2022 Nordix 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.
 *
 *  SPDX-License-Identifier: Apache-2.0
 *  ============LICENSE_END=========================================================
 */

package org.onap.cps.ncmp.api.impl.utils;

import com.google.common.base.Strings;
import java.util.Collection;
import java.util.Map;
import lombok.AccessLevel;
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.onap.cps.ncmp.api.models.CmHandleQueryServiceParameters;
import org.onap.cps.spi.exceptions.DataValidationException;

@Slf4j
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public class RestQueryParametersValidator {

    /**
     * Validate query parameters.
     *
     * @param cmHandleQueryServiceParameters name of data to be validated
     * @param validConditionNames valid condition names
     */
    public static void validateCmHandleQueryParameters(
        final CmHandleQueryServiceParameters cmHandleQueryServiceParameters,
        final Collection<String> validConditionNames) {
        cmHandleQueryServiceParameters.getCmHandleQueryParameters().forEach(
                cmHandleQueryParameter -> {
                    if (validConditionNames.stream().noneMatch(validConditionName ->
                        validConditionName.equals(cmHandleQueryParameter.getConditionName()))) {
                        throw createDataValidationException(
                                String.format("Wrong 'conditionName': %s - please supply a valid name.",
                                cmHandleQueryParameter.getConditionName()));
                    }
                    if (cmHandleQueryParameter.getConditionParameters().isEmpty()) {
                        throw createDataValidationException(
                                "Empty 'conditionsParameters' - please supply a valid condition parameter.");
                    }
                    cmHandleQueryParameter.getConditionParameters().forEach(
                            RestQueryParametersValidator::validateConditionParameter
                    );
                }
        );
    }

    private static void validateConditionParameter(final Map<String, String> conditionParameter) {
        if (conditionParameter.isEmpty()) {
            throw createDataValidationException(
                    "Empty 'conditionsParameter' - please supply a valid condition parameter.");
        }
        if (conditionParameter.size() > 1) {
            throw createDataValidationException("Too many names in one 'conditionsParameter' -"
                    + " please supply one name in one condition parameter.");
        }
        conditionParameter.forEach((key, value) -> {
            if (Strings.isNullOrEmpty(key)) {
                throw createDataValidationException(
                        "Missing 'conditionsParameterName' - please supply a valid name.");
            }
        });
    }

    /**
     * Validate module name condition properties.
     * @param conditionProperty name of data to be validated
     */
    public static void validateModuleNameConditionProperties(final Map<String, String> conditionProperty) {
        if (conditionProperty.containsKey("moduleName") && !conditionProperty.get("moduleName").isEmpty()) {
            return;
        }
        throw createDataValidationException("Wrong module condition property. - "
                + "please supply a valid condition property.");
    }

    /**
     * Validate CPS path condition properties.
     * @param conditionProperty name of data to be validated
     */
    public static boolean validateCpsPathConditionProperties(final Map<String, String> conditionProperty) {
        if (conditionProperty.isEmpty()) {
            return true;
        }
        if (conditionProperty.size() > 1) {
            throw createDataValidationException("Only one condition property is allowed for the CPS path query.");
        }
        if (!conditionProperty.containsKey("cpsPath")) {
            throw createDataValidationException(
                "Wrong CPS path condition property. - expecting \"cpsPath\" as the condition property.");
        }
        final String cpsPath = conditionProperty.get("cpsPath");
        if (cpsPath.isBlank()) {
            throw createDataValidationException(
                "Wrong CPS path. - please supply a valid CPS path.");
        }
        if (cpsPath.contains("/additional-properties")) {
            log.debug("{} - Private metadata cannot be queried. Nothing to be returned",
                cpsPath);
            return false;
        }
        return true;
    }

    private static DataValidationException createDataValidationException(final String details) {
        return new DataValidationException("Invalid Query Parameter.", details);
    }

}