/*
 * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.restconf.nb.rfc8040.rests.utils;

import static java.util.Objects.requireNonNull;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import java.util.Arrays;
import java.util.Set;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.model.api.SchemaContext;

/**
 * Constants for RestconfDataService.
 *
 */
public final class RestconfDataServiceConstant {
    public static final QName NETCONF_BASE_QNAME = SchemaContext.NAME;

    private RestconfDataServiceConstant() {
        throw new UnsupportedOperationException("Util class.");
    }

    /**
     * Constants for read data.
     *
     */
    public static final class ReadData {
        // URI parameters
        public static final String CONTENT = "content";
        public static final String DEPTH = "depth";
        public static final String FIELDS = "fields";

        // content values
        public static final String CONFIG = "config";
        public static final String ALL = "all";
        public static final String NONCONFIG = "nonconfig";

        // depth values
        public static final String UNBOUNDED = "unbounded";
        public static final int MIN_DEPTH = 1;
        public static final int MAX_DEPTH = 65535;

        public static final String WITH_DEFAULTS = "with-defaults";

        /**
         * With-default values, as per
         * <a href="https://tools.ietf.org/html/rfc8040#section-4.8.9">RFC8040 section 4.8.9</a>.
         */
        enum WithDefaults {
            /**
             * All data nodes are reported.
             */
            REPORT_ALL("report-all"),
            /**
             * Data nodes set to the YANG default are not reported.
             */
            TRIM("trim"),
            /**
             * Data nodes set to the YANG default by the client are reported.
             */
            EXPLICIT("explicit"),
            /**
             * All data nodes are reported, and defaults are tagged.
             */
            REPORT_ALL_TAGGED("report-all-tagged");

            private static final ImmutableMap<String, WithDefaults> VALUES =
                Maps.uniqueIndex(Arrays.asList(values()), WithDefaults::value);

            private @NonNull String value;

            WithDefaults(final @NonNull String value) {
                this.value = value;
            }

            public @NonNull String value() {
                return value;
            }

            static @Nullable WithDefaults forValue(final String value) {
                return VALUES.get(requireNonNull(value));
            }

            static @Nullable Set<String> possibleValues() {
                return VALUES.keySet();
            }
        }

        private ReadData() {
            throw new UnsupportedOperationException("Util class.");
        }
    }

    /**
     * Common for PostData and PutData.
     */
    public static final class PostPutQueryParameters {
        public static final String INSERT = "insert";
        public static final String POINT = "point";

        /**
         * Insert values, as per <a href="https://tools.ietf.org/html/rfc8040#section-4.8.5">RFC8040 section 4.8.5</a>.
         */
        public enum Insert {
            /**
             * Insert the new data as the new first entry.
             */
            FIRST("first"),
            /**
             * Insert the new data as the new last entry.
             */
            LAST("last"),
            /**
             * Insert the new data before the insertion point, as specified by the value of the "point" parameter.
             */
            BEFORE("before"),
            /**
             * Insert the new data after the insertion point, as specified by the value of the "point" parameter.
             */
            AFTER("after");

            private static final ImmutableMap<String, Insert> VALUES =
                Maps.uniqueIndex(Arrays.asList(values()), Insert::value);

            private @NonNull String value;

            Insert(final @NonNull String value) {
                this.value = value;
            }

            public @NonNull String value() {
                return value;
            }

            public static @Nullable Insert forValue(final String value) {
                return VALUES.get(requireNonNull(value));
            }
        }

        private PostPutQueryParameters() {
            // Hidden on purpose
        }
    }
}