/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.apache.atlas.utils;

import org.apache.atlas.exception.AtlasBaseException;
import org.apache.atlas.model.instance.AtlasEntity;
import org.apache.atlas.model.instance.EntityMutationResponse;
import org.apache.atlas.model.typedef.AtlasEntityDef;
import org.apache.atlas.model.typedef.AtlasStructDef;
import org.apache.atlas.model.typedef.AtlasTypesDef;
import org.apache.atlas.repository.store.bootstrap.AtlasTypeDefStoreInitializer;
import org.apache.atlas.repository.store.graph.v2.AtlasEntityStoreV2;
import org.apache.atlas.repository.store.graph.v2.AtlasEntityStreamForImport;
import org.apache.atlas.store.AtlasTypeDefStore;
import org.apache.atlas.type.AtlasType;
import org.apache.atlas.type.AtlasTypeRegistry;
import org.apache.commons.io.FileUtils;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.testng.SkipException;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static java.util.Objects.requireNonNull;
import static org.testng.Assert.assertFalse;
import static org.testng.Assert.assertNotNull;
import static org.testng.Assert.assertTrue;

public class TestLoadModelUtils {
    public static final Logger LOG = LoggerFactory.getLogger(TestLoadModelUtils.class);

    private TestLoadModelUtils() {
        // to block instantiation
    }

    public static List<String> getAllModels(String dirName) throws IOException {
        List<String> ret                  = null;
        File         topModelsDir         = new File(System.getProperty("user.dir") + "/../addons/models");
        File[]       topModelsDirContents = topModelsDir.exists() ? topModelsDir.listFiles() : null;

        assertNotNull(topModelsDirContents, topModelsDir.getAbsolutePath() + ": unable to find/read directory");

        Arrays.sort(topModelsDirContents);

        for (File modelDir : topModelsDirContents) {
            if (modelDir.exists() && modelDir.isDirectory() && modelDir.getAbsolutePath().contains(dirName)) {
                File[] models = modelDir.listFiles();

                if (models != null) {
                    Arrays.sort(models);
                }

                ret = new ArrayList<>();

                for (File model : requireNonNull(models)) {
                    ret.add(getFileContents(modelDir, model.getName()));
                }
            }

            if (ret != null && !ret.isEmpty()) {
                break;
            }
        }

        return ret;
    }

    public static String getModelJson(String fileName) throws IOException {
        String ret                  = null;
        File   topModelsDir         = new File(System.getProperty("user.dir") + "/../addons/models");
        File[] topModelsDirContents = topModelsDir.exists() ? topModelsDir.listFiles() : null;

        assertNotNull(topModelsDirContents, topModelsDir.getAbsolutePath() + ": unable to find/read directory");

        if (topModelsDirContents != null) {
            Arrays.sort(topModelsDirContents);

            for (File modelDir : topModelsDirContents) {
                if (modelDir.exists() && modelDir.isDirectory()) {
                    ret = getFileContents(modelDir, fileName);

                    if (ret != null) {
                        break;
                    }
                }
            }

            if (ret == null) {
                ret = getFileContents(topModelsDir, fileName);
            }

            assertNotNull(ret, fileName + ": unable to find model file");
        } else {
            throw new IOException("Unable to retrieve model contents.");
        }

        return ret;
    }

    public static String getFileContents(File dir, String fileName) throws IOException {
        if (dir.exists() && dir.isDirectory()) {
            File file = new File(dir, fileName);

            if (file.exists() && file.isFile()) {
                return FileUtils.readFileToString(file);
            }
        }

        return null;
    }

    public static String getModelJsonFromResources(String fileName) throws IOException {
        String filePath = TestResourceFileUtils.getTestFilePath(fileName);
        File   f        = new File(filePath);
        String s        = FileUtils.readFileToString(f);

        assertFalse(StringUtils.isEmpty(s), "Model file read correctly from resources!");

        return s;
    }

    public static AtlasTypesDef loadTypes(String entitiesSubDir, String fileName) {
        try {
            return TestResourceFileUtils.readObjectFromJson(entitiesSubDir, fileName, AtlasTypesDef.class);
        } catch (IOException e) {
            throw new SkipException(String.format("loadTypes: '%s' could not be loaded.", fileName));
        }
    }

    public static AtlasEntity.AtlasEntityWithExtInfo loadEntity(String entitiesSubDir, String fileName) {
        try {
            return TestResourceFileUtils.readObjectFromJson(entitiesSubDir, fileName, AtlasEntity.AtlasEntityWithExtInfo.class);
        } catch (IOException e) {
            throw new SkipException(String.format("loadEntity: '%s' could not be loaded.", fileName));
        }
    }

    public static void createTypes(AtlasTypeDefStore typeDefStore, String entitiesSubDir, String typesDef) {
        try {
            typeDefStore.createTypesDef(loadTypes(entitiesSubDir, typesDef));
        } catch (AtlasBaseException e) {
            throw new SkipException("setup: could not load typesDef.");
        }
    }

    public static void createAtlasEntity(AtlasEntityStoreV2 entityStoreV1, AtlasEntity.AtlasEntityWithExtInfo atlasEntity) {
        try {
            EntityMutationResponse response = entityStoreV1.createOrUpdateForImport(new AtlasEntityStreamForImport(atlasEntity, null));

            assertNotNull(response);
            assertTrue((response.getCreatedEntities() != null && !response.getCreatedEntities().isEmpty()) || (response.getMutatedEntities() != null && !response.getMutatedEntities().isEmpty()));
        } catch (AtlasBaseException e) {
            throw new SkipException(String.format("createAtlasEntity: could not loaded '%s'.", atlasEntity.getEntity().getTypeName()));
        }
    }

    public static void loadModelFromJson(String fileName, AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        AtlasTypesDef typesFromJson = getAtlasTypesDefFromFile(fileName);

        addReplicationAttributes(typesFromJson);
        createTypesAsNeeded(typesFromJson, typeDefStore, typeRegistry);
    }

    public static void loadAllModels(String dirName, AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        List<String> allModels = getAllModels(dirName);

        for (String model : allModels) {
            AtlasTypesDef typesFromJson = AtlasJson.fromJson(model, AtlasTypesDef.class);

            createTypesAsNeeded(typesFromJson, typeDefStore, typeRegistry);
        }
    }

    public static void loadModelFromResourcesJson(String fileName, AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        AtlasTypesDef typesFromJson = getAtlasTypesDefFromResourceFile(fileName);

        createTypesAsNeeded(typesFromJson, typeDefStore, typeRegistry);
    }

    public static void createTypesAsNeeded(AtlasTypesDef typesFromJson, AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws AtlasBaseException {
        if (typesFromJson == null) {
            return;
        }

        AtlasTypesDef typesToCreate = AtlasTypeDefStoreInitializer.getTypesToCreate(typesFromJson, typeRegistry);

        if (typesToCreate != null && !typesToCreate.isEmpty()) {
            typeDefStore.createTypesDef(typesToCreate);
        }
    }

    public static void loadBaseModel(AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        loadModelFromJson("0010-base_model.json", typeDefStore, typeRegistry);
    }

    public static void loadFsModel(AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        loadModelFromJson("1020-fs_model.json", typeDefStore, typeRegistry);
    }

    public static void loadHiveModel(AtlasTypeDefStore typeDefStore, AtlasTypeRegistry typeRegistry) throws IOException, AtlasBaseException {
        loadModelFromJson("1030-hive_model.json", typeDefStore, typeRegistry);
    }

    private static void addReplicationAttributes(AtlasTypesDef typesFromJson) throws IOException {
        if (typesFromJson.getEntityDefs() == null || typesFromJson.getEntityDefs().isEmpty()) {
            return;
        }

        AtlasEntityDef ed = typesFromJson.getEntityDefs().get(0);

        if (!ed.getName().equals("Referenceable")) {
            return;
        }

        String replAttr1Json = TestResourceFileUtils.getJson("stocksDB-Entities", "replicationAttrs");
        String replAttr2Json = StringUtils.replace(replAttr1Json, "From", "To");

        ed.addAttribute(AtlasType.fromJson(replAttr1Json, AtlasStructDef.AtlasAttributeDef.class));
        ed.addAttribute(AtlasType.fromJson(replAttr2Json, AtlasStructDef.AtlasAttributeDef.class));
    }

    private static AtlasTypesDef getAtlasTypesDefFromFile(String fileName) throws IOException {
        String sampleTypes = getModelJson(fileName);

        if (sampleTypes == null) {
            return null;
        }

        return AtlasType.fromJson(sampleTypes, AtlasTypesDef.class);
    }

    private static AtlasTypesDef getAtlasTypesDefFromResourceFile(String fileName) throws IOException {
        String sampleTypes = getModelJsonFromResources(fileName);

        return AtlasType.fromJson(sampleTypes, AtlasTypesDef.class);
    }
}
