/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 2009 Oracle.  All rights reserved.
 *
 */
using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading;
using System.Xml;
using NUnit.Framework;
using BerkeleyDB;

namespace CsharpAPITest
{
	[TestFixture]
	public class JoinCursorTest
	{
		private string testFixtureHome;
		private string testFixtureName;
		private string testName;
		private string testHome;

		[TestFixtureSetUp]
		public void RunBeforeTests()
		{
			testFixtureName = "JoinCursorTest";
			testFixtureHome = "./TestOut/" + testFixtureName;

			Configuration.ClearDir(testFixtureHome);
		}

		[Test]
		public void TestJoin()
		{
			testName = "TestJoin";
			testHome = testFixtureHome + "/" + testName;
			string dbFileName = testHome + "/" + testName + ".db";
			string secFileName1 = testHome + "/" + "sec_" + testName + "1.db";
			string secFileName2 = testHome + "/" + "sec_" + testName + "2.db";

			Configuration.ClearDir(testHome);

			// Open a primary database.
			BTreeDatabaseConfig dbCfg = new BTreeDatabaseConfig();
			dbCfg.Creation = CreatePolicy.IF_NEEDED;
			BTreeDatabase db = BTreeDatabase.Open(dbFileName, dbCfg);

			/*
			 * Open two databases, their secondary databases and 
			 * secondary cursors.
			 */
			SecondaryBTreeDatabase secDB1, secDB2;
			SecondaryCursor[] cursors = new SecondaryCursor[2];
			GetSecCursor(db, secFileName1,
			    new SecondaryKeyGenDelegate(KeyGenOnBigByte),
			    out secDB1, out cursors[0], false, null);
			GetSecCursor(db, secFileName2,
			    new SecondaryKeyGenDelegate(KeyGenOnLittleByte),
			    out secDB2, out cursors[1], true, null);

			// Get join cursor.
			JoinCursor joinCursor = db.Join(cursors, true);

			// Close all.
			joinCursor.Close();
			cursors[0].Close();
			cursors[1].Close();
			secDB1.Close();
			secDB2.Close();
			db.Close();
		}

		[Test]
		public void TestMoveJoinCursor()
		{
			testName = "TestMoveJoinCursor";
			testHome = testFixtureHome + "/" + testName;
			string dbFileName = testHome + "/" + testName + ".db";
			string secFileName1 = testHome + "/" + "sec_" + testName + "1.db";
			string secFileName2 = testHome + "/" + "sec_" + testName + "2.db";

			Configuration.ClearDir(testHome);

			// Open a primary database.
			BTreeDatabaseConfig dbCfg = new BTreeDatabaseConfig();
			dbCfg.Creation = CreatePolicy.IF_NEEDED;
			BTreeDatabase db = BTreeDatabase.Open(dbFileName, dbCfg);

			/*
			 * Open a secondary database on high byte of 
			 * its data and another secondary database on 
			 * little byte of its data.
			 */
			SecondaryBTreeDatabase secDB1, secDB2;
			SecondaryCursor[] cursors = new SecondaryCursor[2];
			byte[] byteValue = new byte[1];

			byteValue[0] = 0;
			GetSecCursor(db, secFileName1,
			    new SecondaryKeyGenDelegate(KeyGenOnBigByte),
			    out secDB1, out cursors[0], false,
			    new DatabaseEntry(byteValue));

			byteValue[0] = 1;
			GetSecCursor(db, secFileName2,
			    new SecondaryKeyGenDelegate(KeyGenOnLittleByte),
			    out secDB2, out cursors[1], true,
			    new DatabaseEntry(byteValue));

			// Get join cursor.
			JoinCursor joinCursor = db.Join(cursors, true);

			/*
			 * MoveNextJoinItem do not use data value found 
			 * in all of the cursor so the data in Current won't be 
			 * changed.
			 */
			Assert.IsTrue(joinCursor.MoveNextItem());
			Assert.AreEqual(0, joinCursor.Current.Key.Data[
			    joinCursor.Current.Key.Data.Length - 1]);
			Assert.AreEqual(1, joinCursor.Current.Key.Data[0]);
			Assert.IsNull(joinCursor.Current.Value.Data);

			// Iterate on join cursor. 
			foreach (KeyValuePair<DatabaseEntry, DatabaseEntry> pair in joinCursor)
			{
				/*
				 * Confirm that the key got by join cursor has 0 at 
				 * its highest byte and 1 at its lowest byte.
				 */
				Assert.AreEqual(0, pair.Key.Data[pair.Key.Data.Length - 1]);
				Assert.AreEqual(1, pair.Key.Data[0]);
			}

			Assert.IsFalse(joinCursor.MoveNext());

			// Close all.
			joinCursor.Close();
			cursors[0].Close();
			cursors[1].Close();
			secDB1.Close();
			secDB2.Close();
			db.Close();
		}

		public void GetSecCursor(BTreeDatabase db,
		    string secFileName, SecondaryKeyGenDelegate keyGen,
		    out SecondaryBTreeDatabase secDB,
		    out SecondaryCursor cursor, bool ifCfg,
		    DatabaseEntry data)
		{
			// Open secondary database.
			SecondaryBTreeDatabaseConfig secCfg = 
			    new SecondaryBTreeDatabaseConfig(db, keyGen);
			secCfg.Creation = CreatePolicy.IF_NEEDED;
			secCfg.Duplicates = DuplicatesPolicy.SORTED;
			secDB = SecondaryBTreeDatabase.Open(secFileName, secCfg);

			int[] intArray = new int[4];
			intArray[0] = 0;
			intArray[1] = 1;
			intArray[2] = 2049;
			intArray[3] = 65537;
			for (int i = 0; i < 4; i++)
			{
				DatabaseEntry record = new DatabaseEntry(
				    BitConverter.GetBytes(intArray[i]));
				db.Put(record, record);
			}

			// Get secondary cursor on the secondary database.
			if (ifCfg == false)
				cursor = secDB.SecondaryCursor();
			else
				cursor = secDB.SecondaryCursor(new CursorConfig());

			// Position the cursor.
			if (data != null)
				Assert.IsTrue(cursor.Move(data, true));
		}

		public DatabaseEntry KeyGenOnLittleByte(
		    DatabaseEntry key, DatabaseEntry data)
		{
			byte[] byteArr = new byte[1];
			byteArr[0] = data.Data[0];
			DatabaseEntry dbtGen = new DatabaseEntry(byteArr);
			return dbtGen;
		}

		public DatabaseEntry KeyGenOnBigByte(
		    DatabaseEntry key, DatabaseEntry data)
		{
			byte[] byteArr = new byte[1];
			byteArr[0] = data.Data[data.Data.Length - 1];
			DatabaseEntry dbtGen = new DatabaseEntry(byteArr);
			return dbtGen;
		}
	}
}
