/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * 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.
 */
package org.teiid.translator.mongodb;

import static org.junit.Assert.assertEquals;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;

import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.mockito.Mockito;
import org.teiid.cdk.api.TranslationUtility;
import org.teiid.core.util.ObjectConverterUtil;
import org.teiid.core.util.UnitTestUtil;
import org.teiid.language.Command;
import org.teiid.language.Delete;
import org.teiid.language.Insert;
import org.teiid.language.Update;
import org.teiid.query.metadata.TransformationMetadata;
import org.teiid.query.unittest.RealMetadataFactory;
import org.teiid.translator.TranslatorException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBObject;

@SuppressWarnings("nls")
public class TestMongoDBUpdateVisitor {

    private MongoDBExecutionFactory translator;
    private TranslationUtility utility;
    private LinkedHashMap<String, DBObject> docs;

    @Before
    public void setUp() throws Exception {
    	this.translator = new MongoDBExecutionFactory();
    	this.translator.start();

    	TransformationMetadata metadata = RealMetadataFactory.fromDDL(ObjectConverterUtil.convertFileToString(UnitTestUtil.getTestDataFile("northwind.ddl")), "sakila", "northwind");
    	this.utility = new TranslationUtility(metadata);

    }

    private MergeDetails buildKey(String name, String parentTable, String embeddedTable, String id) {
    	MergeDetails key = new MergeDetails(null);
    	key.setName(name);
    	key.setParentTable(parentTable);
    	key.setEmbeddedTable(embeddedTable);
    	key.setId("id", id);
    	return key;
    }

    private void helpExecute(String query, String collection, String expected, String match, MergeDetails pushKey, List<MergeDetails> pullKeys) throws Exception {
    	Command cmd = this.utility.parseCommand(query);
    	MongoDBUpdateVisitor visitor = new MongoDBUpdateVisitor(this.translator, this.utility.createRuntimeMetadata(), Mockito.mock(DB.class));
    	visitor.visitNode(cmd);
    	if (!visitor.exceptions.isEmpty()) {
    		throw visitor.exceptions.get(0);
    	}

    	assertEquals(collection, visitor.mongoDoc.getTargetTable().getName());

    	if (cmd instanceof Insert) {
    		assertEquals("wrong insert", expected, visitor.getInsert(this.docs).toString());
    	}
    	else if (cmd instanceof Update) {
    		assertEquals("wrong update", expected, visitor.getUpdate(this.docs).toString());
    	}
    	else if (cmd instanceof Delete) {
    	}

    	if (visitor.match != null) {
    		assertEquals("match wrong", match, visitor.match.toString());
    	}

    	MongoDocument doc = visitor.mongoDoc;
    	if (doc.isMerged()) {
    		assertEquals("Wrong PushKey", pushKey.toString(), visitor.mongoDoc.getMergeKey().toString());
    	}

    	if (!visitor.mongoDoc.getEmbeddedReferences().isEmpty()) {
    		assertEquals("Wrong PullKeys", visitor.mongoDoc.getEmbeddedReferences().toString(), pullKeys.toString());
    	}
    	this.docs = null;
    }

	@Test
	public void testInsert() throws Exception {
		helpExecute("insert into users (id, user_id, age, status) values (1, 'johndoe', 34, 'A')", "users",
				"{ \"user_id\" : \"johndoe\" , \"age\" : 34 , \"status\" : \"A\" , \"_id\" : 1}",
				null, null, null);
	}

	@Test
	public void testInsertWithFKWithEmbeddable() throws Exception {
		this.docs = new LinkedHashMap<String, DBObject>();
		this.docs.put("Categories", new BasicDBObject("categoryK", "categoryV"));
		this.docs.put("Suppliers", new BasicDBObject("SuppliersK", "SuppliersV"));

		ArrayList<MergeDetails> pull = new ArrayList<MergeDetails>();
		pull.add(buildKey("Categories", "Products", "Categories", "24"));
		pull.add(buildKey("Suppliers", "Products", "Suppliers", "34"));

		helpExecute("insert into Products (ProductID, ProductName, SupplierID, CategoryID, QuantityPerUnit, UnitPrice, UnitsInStock, UnitsOnOrder, ReorderLevel, Discontinued) " +
				"values (1, 'hammer', 34, 24, 12, 12.50, 3, 4, 2, 1)",
				"Products",
				"{ \"ProductName\" : \"hammer\" , \"SupplierID\" : 34 , \"CategoryID\" : 24 , \"QuantityPerUnit\" : \"12\" , \"UnitPrice\" : 12.5 , \"UnitsInStock\" : 3 , \"UnitsOnOrder\" : 4 , \"ReorderLevel\" : 2 , \"Discontinued\" : 1 , \"_id\" : 1 , \"Categories\" : { \"categoryK\" : \"categoryV\"} , \"Suppliers\" : { \"SuppliersK\" : \"SuppliersV\"}}",
				null, null,	pull);
	}


	@Test
	public void testMergeInsert() throws Exception {
		helpExecute("insert into OrderDetails (odID, ProductID, UnitPrice, Quantity, Discount) " +
				"values (2, 3, 1.50, 12, 1.0)",
				"Orders",
				"{ \"UnitPrice\" : 1.5 , \"Quantity\" : 12 , \"Discount\" : 1.0 , \"_id\" : { \"odID\" : 2 , \"ProductID\" : 3}}",
				null, buildKey("FK1", "Orders", "OrderDetails", "2"), null);
	}

	@Test
	public void testUpdate() throws Exception {
		helpExecute("update users set age = 48",  "users", "{ \"age\" : 48}", null, null, null);
	}

	@Test
	public void testUpdateFK() throws Exception {
		helpExecute(
				"update users set user_id = 'billybob'",
				"users",
				"{ \"user_id\" : \"billybob\"}",
				null, null, null);
	}

	@Test
	public void testUpdateWithWhere() throws Exception {
		helpExecute(
				"update users set user_id = 'billybob' WHERE age > 50",
				"users",
				"{ \"user_id\" : \"billybob\"}",
				"{ \"age\" : { \"$gt\" : 50}}", null, null);
	}

	@Test
	public void testDeleteWithWhere() throws Exception {
		helpExecute("delete from users WHERE age > 50", "users", null,
				"{ \"age\" : { \"$gt\" : 50}}", null, null);
	}

	@Test
	public void testUpdateEmbedddedInSimpleUpdate() throws Exception {
		helpExecute("UPDATE OrderDetails SET UnitPrice = 14.50", "Orders",
				"{ \"OrderDetails.$.UnitPrice\" : 14.5}", null,
				buildKey("FK1", "Orders", "OrderDetails", null), null);
	}

	@Test(expected=TranslatorException.class)
	public void testUpdateMergeReferenceUpdate() throws Exception {
		helpExecute("UPDATE OrderDetails SET ProductID = 4", "Orders",
				"{ \"ProductID\" : 4}",
				null, buildKey("FK1", "Orders", "OrderDetails", null),
				null);
	}

	@Test(expected=TranslatorException.class)
	public void testUpdateMergeParentUpdate() throws Exception {
		this.docs = new LinkedHashMap<String, DBObject>();
		this.docs.put("Products", new BasicDBObject("key", "value"));
		helpExecute("UPDATE OrderDetails SET odID = 4",  "Orders",
				"{ \"Products.ProductID\" : { \"$ref\" : \"Products\" , \"$id\" : 4} , \"Products\" : { \"key\" : \"value\"}}",
				null, buildKey("FK1", "Orders", "OrderDetails", null), null);
	}

	@Test
	public void testUpdateParentTableWithEmbeddable() throws Exception {
		this.docs = new LinkedHashMap<String, DBObject>();
		this.docs.put("Categories", new BasicDBObject("categoryK", "categoryV"));

		ArrayList<MergeDetails> pull = new ArrayList<MergeDetails>();
		pull.add(buildKey("Categories", "Products", "Categories", "4"));
		pull.add(buildKey("Suppliers", "Products", "Suppliers", null));

		helpExecute("UPDATE Products SET CategoryID = 4",  "Products",
				"{ \"CategoryID\" : 4 , \"Categories\" : { \"categoryK\" : \"categoryV\"}}",
				null,null,pull);
	}


	@Test
	public void testUpdateEmbeddableTable() throws Exception {
		this.docs = new LinkedHashMap<String, DBObject>();

		helpExecute("UPDATE Categories SET Description = 'change' WHERE CategoryID = 1",  "Categories",
				"{ \"Description\" : \"change\"}",
				"{ \"_id\" : 1}",
				null,
				null);
	}

	@Test
	public void testCompositeKeyInsert() throws Exception {
		helpExecute("insert into G1 (e1, e2, e3) values (1,2,3)", "G1",
				"{ \"e3\" : 3 , \"_id\" : { \"e1\" : 1 , \"e2\" : 2}}",
				null, null, null);
	}

	@Test
	@Ignore
	public void testCompositeKeyUpdate() throws Exception {
		helpExecute("update G1 set e2 = 48",  "G1", "{ \"_id.e2\" : 48}", null, null, null);
	}

	@Test
	public void testCompositeKeyDeleteWithWhere() throws Exception {
		helpExecute("delete from G1 WHERE e1 > 50", "G1", null,
				"{ \"_id.e1\" : { \"$gt\" : 50}}", null, null);
	}

	@Test
	public void testCompositeFKKeyInsert() throws Exception {
		helpExecute("insert into G2 (e1, e2, e3) values (1,2,3)", "G2",
				"{ \"e1\" : 1 , \"e2\" : 2 , \"e3\" : 3}",
				null, null, null);
	}

	@Test
	public void testCompositeFKUpdate() throws Exception {
		helpExecute("update G2 set e1=47, e2 = 48",  "G2", "{ \"e1\" : 47 , \"e2\" : 48}", null, null, null);
	}

	@Test
	public void testCompositeFKUpdateNonKey() throws Exception {
		helpExecute("update G2 set e3=0 where e2 = 48",  "G2", "{ \"e3\" : 0}", "{ \"e2\" : 48}", null, null);
	}

}
