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package de.taimos.dvalin.mongo;

/*
 * #%L
 * Spring DAO Mongo
 * %%
 * Copyright (C) 2013 - 2015 Taimos GmbH
 * %%
 * 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.
 * #L%
 */

import java.io.IOException;
import java.util.Scanner;

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.stereotype.Component;

import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.util.JSON;

import de.taimos.daemon.spring.conditional.OnSystemProperty;


/**
 * Copyright 2014 Taimos GmbH

 * 

 * 
 * Initialized the database with data found in the classpath. It searches for files in the folder mongodb ending with .ndjson. The filename
 * is used as name of the collection. The contents of this file has to be valid ND-JSON which means that it contains one JSON Object per
 * line.
 *
 * @author Thorsten Hoeger
 */
@Component
@OnSystemProperty(propertyName = "mongodb.demodata", propertyValue = "true")
public class MongoDBInit {

    private static final Logger LOGGER = LoggerFactory.getLogger(MongoDBInit.class);

    @Autowired
    private MongoClient mongo;


    /**
     * init database with demo data
     */
    @PostConstruct
    public void initDatabase() {
        MongoDBInit.LOGGER.info("initializing MongoDB");
        String dbName = System.getProperty("mongodb.name");
        if (dbName == null) {
            throw new RuntimeException("Missing database name; Set system property 'mongodb.name'");
        }
        MongoDatabase db = this.mongo.getDatabase(dbName);

        try {
            PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
            Resource[] resources = resolver.getResources("classpath*:mongodb/*.ndjson");
            MongoDBInit.LOGGER.info("Scanning for collection data");
            for (Resource res : resources) {
                String filename = res.getFilename();
                String collection = filename.substring(0, filename.length() - 7);
                MongoDBInit.LOGGER.info("Found collection file: {}", collection);
                MongoCollection dbCollection = db.getCollection(collection, DBObject.class);
                try (Scanner scan = new Scanner(res.getInputStream(), "UTF-8")) {
                    int lines = 0;
                    while (scan.hasNextLine()) {
                        String json = scan.nextLine();
                        Object parse = JSON.parse(json);
                        if (parse instanceof DBObject) {
                            DBObject dbObject = (DBObject) parse;
                            dbCollection.insertOne(dbObject);
                        } else {
                            MongoDBInit.LOGGER.error("Invalid object found: {}", parse);
                            throw new RuntimeException("Invalid object");
                        }
                        lines++;
                    }
                    MongoDBInit.LOGGER.info("Imported {} objects into collection {}", lines, collection);
                }
            }
        } catch (IOException e) {
            throw new RuntimeException("Error importing objects", e);
        }
    }

}