/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.action.admin.cluster.snapshots.restore;

import org.elasticsearch.ElasticsearchGenerationException;
import org.elasticsearch.action.ActionRequestValidationException;
import org.elasticsearch.action.support.IndicesOptions;
import org.elasticsearch.action.support.master.MasterNodeRequest;
import org.elasticsearch.common.Strings;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentFactory;
import org.elasticsearch.common.xcontent.XContentType;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import static org.elasticsearch.action.ValidateActions.addValidationError;
import static org.elasticsearch.common.settings.Settings.readSettingsFromStream;
import static org.elasticsearch.common.settings.Settings.writeSettingsToStream;
import static org.elasticsearch.common.settings.Settings.Builder.EMPTY_SETTINGS;
import static org.elasticsearch.common.xcontent.support.XContentMapValues.nodeBooleanValue;

/**
 * Restore snapshot request
 */
public class RestoreSnapshotRequest extends MasterNodeRequest<RestoreSnapshotRequest> {

    private String snapshot;
    private String repository;
    private String[] indices = Strings.EMPTY_ARRAY;
    private IndicesOptions indicesOptions = IndicesOptions.strictExpandOpen();
    private String renamePattern;
    private String renameReplacement;
    private boolean waitForCompletion;
    private boolean includeGlobalState = false;
    private boolean partial = false;
    private boolean includeAliases = true;
    private Settings settings = EMPTY_SETTINGS;
    private Settings indexSettings = EMPTY_SETTINGS;
    private String[] ignoreIndexSettings = Strings.EMPTY_ARRAY;

    public RestoreSnapshotRequest() {
    }

    /**
     * Constructs a new put repository request with the provided repository and snapshot names.
     *
     * @param repository repository name
     * @param snapshot   snapshot name
     */
    public RestoreSnapshotRequest(String repository, String snapshot) {
        this.snapshot = snapshot;
        this.repository = repository;
    }

    @Override
    public ActionRequestValidationException validate() {
        ActionRequestValidationException validationException = null;
        if (snapshot == null) {
            validationException = addValidationError("name is missing", validationException);
        }
        if (repository == null) {
            validationException = addValidationError("repository is missing", validationException);
        }
        if (indices == null) {
            validationException = addValidationError("indices are missing", validationException);
        }
        if (indicesOptions == null) {
            validationException = addValidationError("indicesOptions is missing", validationException);
        }
        if (settings == null) {
            validationException = addValidationError("settings are missing", validationException);
        }
        if (indexSettings == null) {
            validationException = addValidationError("indexSettings are missing", validationException);
        }
        if (ignoreIndexSettings == null) {
            validationException = addValidationError("ignoreIndexSettings are missing", validationException);
        }
        return validationException;
    }

    /**
     * Sets the name of the snapshot.
     *
     * @param snapshot snapshot name
     * @return this request
     */
    public RestoreSnapshotRequest snapshot(String snapshot) {
        this.snapshot = snapshot;
        return this;
    }

    /**
     * Returns the name of the snapshot.
     *
     * @return snapshot name
     */
    public String snapshot() {
        return this.snapshot;
    }

    /**
     * Sets repository name
     *
     * @param repository repository name
     * @return this request
     */
    public RestoreSnapshotRequest repository(String repository) {
        this.repository = repository;
        return this;
    }

    /**
     * Returns repository name
     *
     * @return repository name
     */
    public String repository() {
        return this.repository;
    }

    /**
     * Sets the list of indices that should be restored from snapshot
     * <p>
     * The list of indices supports multi-index syntax. For example: "+test*" ,"-test42" will index all indices with
     * prefix "test" except index "test42". Aliases are not supported. An empty list or {"_all"} will restore all open
     * indices in the snapshot.
     *
     * @param indices list of indices
     * @return this request
     */
    public RestoreSnapshotRequest indices(String... indices) {
        this.indices = indices;
        return this;
    }

    /**
     * Sets the list of indices that should be restored from snapshot
     * <p>
     * The list of indices supports multi-index syntax. For example: "+test*" ,"-test42" will index all indices with
     * prefix "test" except index "test42". Aliases are not supported. An empty list or {"_all"} will restore all open
     * indices in the snapshot.
     *
     * @param indices list of indices
     * @return this request
     */
    public RestoreSnapshotRequest indices(List<String> indices) {
        this.indices = indices.toArray(new String[indices.size()]);
        return this;
    }

    /**
     * Returns list of indices that should be restored from snapshot
     */
    public String[] indices() {
        return indices;
    }

    /**
     * Specifies what type of requested indices to ignore and how to deal with wildcard expressions.
     * For example indices that don't exist.
     *
     * @return the desired behaviour regarding indices to ignore and wildcard indices expression
     */
    public IndicesOptions indicesOptions() {
        return indicesOptions;
    }

    /**
     * Specifies what type of requested indices to ignore and how to deal with wildcard expressions.
     * For example indices that don't exist.
     *
     * @param indicesOptions the desired behaviour regarding indices to ignore and wildcard indices expressions
     * @return this request
     */
    public RestoreSnapshotRequest indicesOptions(IndicesOptions indicesOptions) {
        this.indicesOptions = indicesOptions;
        return this;
    }

    /**
     * Sets rename pattern that should be applied to restored indices.
     * <p>
     * Indices that match the rename pattern will be renamed according to {@link #renameReplacement(String)}. The
     * rename pattern is applied according to the {@link java.util.regex.Matcher#appendReplacement(StringBuffer, String)}
     * The request will fail if two or more indices will be renamed into the same name.
     *
     * @param renamePattern rename pattern
     * @return this request
     */
    public RestoreSnapshotRequest renamePattern(String renamePattern) {
        this.renamePattern = renamePattern;
        return this;
    }

    /**
     * Returns rename pattern
     *
     * @return rename pattern
     */
    public String renamePattern() {
        return renamePattern;
    }

    /**
     * Sets rename replacement
     * <p>
     * See {@link #renamePattern(String)} for more information.
     *
     * @param renameReplacement rename replacement
     */
    public RestoreSnapshotRequest renameReplacement(String renameReplacement) {
        this.renameReplacement = renameReplacement;
        return this;
    }

    /**
     * Returns rename replacement
     *
     * @return rename replacement
     */
    public String renameReplacement() {
        return renameReplacement;
    }

    /**
     * If this parameter is set to true the operation will wait for completion of restore process before returning.
     *
     * @param waitForCompletion if true the operation will wait for completion
     * @return this request
     */
    public RestoreSnapshotRequest waitForCompletion(boolean waitForCompletion) {
        this.waitForCompletion = waitForCompletion;
        return this;
    }

    /**
     * Returns wait for completion setting
     *
     * @return true if the operation will wait for completion
     */
    public boolean waitForCompletion() {
        return waitForCompletion;
    }

    /**
     * Returns true if indices with failed to snapshot shards should be partially restored.
     *
     * @return true if indices with failed to snapshot shards should be partially restored
     */
    public boolean partial() {
        return partial;
    }

    /**
     * Set to true to allow indices with failed to snapshot shards should be partially restored.
     *
     * @param partial true if indices with failed to snapshot shards should be partially restored.
     * @return this request
     */
    public RestoreSnapshotRequest partial(boolean partial) {
        this.partial = partial;
        return this;
    }

    /**
     * Sets repository-specific restore settings.
     * <p>
     * See repository documentation for more information.
     *
     * @param settings repository-specific snapshot settings
     * @return this request
     */
    public RestoreSnapshotRequest settings(Settings settings) {
        this.settings = settings;
        return this;
    }

    /**
     * Sets repository-specific restore settings.
     * <p>
     * See repository documentation for more information.
     *
     * @param settings repository-specific snapshot settings
     * @return this request
     */
    public RestoreSnapshotRequest settings(Settings.Builder settings) {
        this.settings = settings.build();
        return this;
    }

    /**
     * Sets repository-specific restore settings in JSON or YAML format
     * <p>
     * See repository documentation for more information.
     *
     * @param source repository-specific snapshot settings
     * @param xContentType the content type of the source
     * @return this request
     */
    public RestoreSnapshotRequest settings(String source, XContentType xContentType) {
        this.settings = Settings.builder().loadFromSource(source, xContentType).build();
        return this;
    }

    /**
     * Sets repository-specific restore settings
     * <p>
     * See repository documentation for more information.
     *
     * @param source repository-specific snapshot settings
     * @return this request
     */
    public RestoreSnapshotRequest settings(Map<String, Object> source) {
        try {
            XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
            builder.map(source);
            settings(builder.string(), builder.contentType());
        } catch (IOException e) {
            throw new ElasticsearchGenerationException("Failed to generate [" + source + "]", e);
        }
        return this;
    }

    /**
     * Returns repository-specific restore settings
     *
     * @return restore settings
     */
    public Settings settings() {
        return this.settings;
    }

    /**
     * Sets the list of index settings and index settings groups that shouldn't be restored from snapshot
     */
    public RestoreSnapshotRequest ignoreIndexSettings(String... ignoreIndexSettings) {
        this.ignoreIndexSettings = ignoreIndexSettings;
        return this;
    }

    /**
     * Sets the list of index settings and index settings groups that shouldn't be restored from snapshot
     */
    public RestoreSnapshotRequest ignoreIndexSettings(List<String> ignoreIndexSettings) {
        this.ignoreIndexSettings = ignoreIndexSettings.toArray(new String[ignoreIndexSettings.size()]);
        return this;
    }

    /**
     * Returns the list of index settings and index settings groups that shouldn't be restored from snapshot
     */
    public String[] ignoreIndexSettings() {
        return ignoreIndexSettings;
    }

    /**
     * If set to true the restore procedure will restore global cluster state.
     * <p>
     * The global cluster state includes persistent settings and index template definitions.
     *
     * @param includeGlobalState true if global state should be restored from the snapshot
     * @return this request
     */
    public RestoreSnapshotRequest includeGlobalState(boolean includeGlobalState) {
        this.includeGlobalState = includeGlobalState;
        return this;
    }

    /**
     * Returns true if global state should be restored from this snapshot
     *
     * @return true if global state should be restored
     */
    public boolean includeGlobalState() {
        return includeGlobalState;
    }

    /**
     * If set to true the restore procedure will restore aliases
     *
     * @param includeAliases true if aliases should be restored from the snapshot
     * @return this request
     */
    public RestoreSnapshotRequest includeAliases(boolean includeAliases) {
        this.includeAliases = includeAliases;
        return this;
    }

    /**
     * Returns true if aliases should be restored from this snapshot
     *
     * @return true if aliases should be restored
     */
    public boolean includeAliases() {
        return includeAliases;
    }

    /**
     * Sets settings that should be added/changed in all restored indices
     */
    public RestoreSnapshotRequest indexSettings(Settings settings) {
        this.indexSettings = settings;
        return this;
    }

    /**
     * Sets settings that should be added/changed in all restored indices
     */
    public RestoreSnapshotRequest indexSettings(Settings.Builder settings) {
        this.indexSettings = settings.build();
        return this;
    }

    /**
     * Sets settings that should be added/changed in all restored indices
     */
    public RestoreSnapshotRequest indexSettings(String source, XContentType xContentType) {
        this.indexSettings = Settings.builder().loadFromSource(source, xContentType).build();
        return this;
    }

    /**
     * Sets settings that should be added/changed in all restored indices
     */
    public RestoreSnapshotRequest indexSettings(Map<String, Object> source) {
        try {
            XContentBuilder builder = XContentFactory.contentBuilder(XContentType.JSON);
            builder.map(source);
            indexSettings(builder.string(), builder.contentType());
        } catch (IOException e) {
            throw new ElasticsearchGenerationException("Failed to generate [" + source + "]", e);
        }
        return this;
    }

    /**
     * Returns settings that should be added/changed in all restored indices
     */
    public Settings indexSettings() {
        return this.indexSettings;
    }

    /**
     * Parses restore definition
     *
     * @param source restore definition
     * @return this request
     */
    public RestoreSnapshotRequest source(Map<String, Object> source) {
        for (Map.Entry<String, Object> entry : source.entrySet()) {
            String name = entry.getKey();
            if (name.equals("indices")) {
                if (entry.getValue() instanceof String) {
                    indices(Strings.splitStringByCommaToArray((String) entry.getValue()));
                } else if (entry.getValue() instanceof ArrayList) {
                    indices((ArrayList<String>) entry.getValue());
                } else {
                    throw new IllegalArgumentException("malformed indices section, should be an array of strings");
                }
            } else if (name.equals("partial")) {
                partial(nodeBooleanValue(entry.getValue(), "partial"));
            } else if (name.equals("settings")) {
                if (!(entry.getValue() instanceof Map)) {
                    throw new IllegalArgumentException("malformed settings section");
                }
                settings((Map<String, Object>) entry.getValue());
            } else if (name.equals("include_global_state")) {
                includeGlobalState = nodeBooleanValue(entry.getValue(), "include_global_state");
            } else if (name.equals("include_aliases")) {
                includeAliases = nodeBooleanValue(entry.getValue(), "include_aliases");
            } else if (name.equals("rename_pattern")) {
                if (entry.getValue() instanceof String) {
                    renamePattern((String) entry.getValue());
                } else {
                    throw new IllegalArgumentException("malformed rename_pattern");
                }
            } else if (name.equals("rename_replacement")) {
                if (entry.getValue() instanceof String) {
                    renameReplacement((String) entry.getValue());
                } else {
                    throw new IllegalArgumentException("malformed rename_replacement");
                }
            } else if (name.equals("index_settings")) {
                if (!(entry.getValue() instanceof Map)) {
                    throw new IllegalArgumentException("malformed index_settings section");
                }
                indexSettings((Map<String, Object>) entry.getValue());
            } else if (name.equals("ignore_index_settings")) {
                    if (entry.getValue() instanceof String) {
                        ignoreIndexSettings(Strings.splitStringByCommaToArray((String) entry.getValue()));
                    } else if (entry.getValue() instanceof List) {
                        ignoreIndexSettings((List<String>) entry.getValue());
                    } else {
                        throw new IllegalArgumentException("malformed ignore_index_settings section, should be an array of strings");
                    }
            } else {
                if (IndicesOptions.isIndicesOptions(name) == false) {
                    throw new IllegalArgumentException("Unknown parameter " + name);
                }
            }
        }
        indicesOptions(IndicesOptions.fromMap((Map<String, Object>) source, IndicesOptions.lenientExpandOpen()));
        return this;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        super.readFrom(in);
        snapshot = in.readString();
        repository = in.readString();
        indices = in.readStringArray();
        indicesOptions = IndicesOptions.readIndicesOptions(in);
        renamePattern = in.readOptionalString();
        renameReplacement = in.readOptionalString();
        waitForCompletion = in.readBoolean();
        includeGlobalState = in.readBoolean();
        partial = in.readBoolean();
        includeAliases = in.readBoolean();
        settings = readSettingsFromStream(in);
        indexSettings = readSettingsFromStream(in);
        ignoreIndexSettings = in.readStringArray();
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        super.writeTo(out);
        out.writeString(snapshot);
        out.writeString(repository);
        out.writeStringArray(indices);
        indicesOptions.writeIndicesOptions(out);
        out.writeOptionalString(renamePattern);
        out.writeOptionalString(renameReplacement);
        out.writeBoolean(waitForCompletion);
        out.writeBoolean(includeGlobalState);
        out.writeBoolean(partial);
        out.writeBoolean(includeAliases);
        writeSettingsToStream(settings, out);
        writeSettingsToStream(indexSettings, out);
        out.writeStringArray(ignoreIndexSettings);
    }

    @Override
    public String getDescription() {
        return "snapshot [" + repository + ":" + snapshot + "]";
    }

}
