// Copyright © 2008, 2011, Oracle and/or its affiliates. All rights reserved.
//
// MySQL Connector/NET is licensed under the terms of the GPLv2
// <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most 
// MySQL Connectors. There are special exceptions to the terms and 
// conditions of the GPLv2 as it is applied to this software, see the 
// FLOSS License Exception
// <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
//
// This program is free software; you can redistribute it and/or modify 
// it under the terms of the GNU General Public License as published 
// by the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful, but 
// WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
// for more details.
//
// You should have received a copy of the GNU General Public License along 
// with this program; if not, write to the Free Software Foundation, Inc., 
// 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA 

using System;
using System.Data;
using System.Threading;
using MySql.Data.MySqlClient;
using MySql.Data.MySqlClient.Tests;
using System.Linq;
using System.Data.EntityClient;
using System.Data.Common;
using NUnit.Framework;
using System.Data.Objects;
using MySql.Data.Entity.Tests.Properties;

namespace MySql.Data.Entity.Tests
{
  [TestFixture]
  public class Paging : BaseEdmTest
  {
    [Test]
    public void Top()
    {
      using (testEntities context = new testEntities())
      {
        MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Companies LIMIT 2", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);

        int i = 0;
        var query = context.Companies.Top("2");
        string sql = query.ToTraceString();
        CheckSql(sql, SQLSyntax.Top);

        foreach (Company c in query)
        {
          Assert.AreEqual(dt.Rows[i++]["id"], c.Id);
        }
      }
    }

    [Test]
    public void Skip()
    {
      using (testEntities context = new testEntities())
      {
        MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Companies LIMIT 3,20", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);

        int i = 0;
        var query = context.Companies.Skip("it.Id", "3");
        string sql = query.ToTraceString();
        CheckSql(sql, SQLSyntax.Skip);

        foreach (Company c in query)
        {
          Assert.AreEqual(dt.Rows[i++]["id"], c.Id);
        }
      }
    }

    [Test]
    public void SkipAndTakeSimple()
    {
      using (testEntities context = new testEntities())
      {
        MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Companies LIMIT 2,2", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);

        int i = 0;
        var query = context.Companies.Skip("it.Id", "2").Top("2");
        string sql = query.ToTraceString();
        CheckSql(sql, SQLSyntax.SkipAndTakeSimple);

        foreach (Company c in query)
        {
          Assert.AreEqual(dt.Rows[i++]["id"], c.Id);
        }
        Assert.AreEqual(2, i);
      }
    }

    /// <summary>
    /// Bug #45723 Entity Framework DbSortExpression not processed when using Skip & Take  
    /// </summary>
    [Test]
    public void SkipAndTakeWithOrdering()
    {
      using (testEntities context = new testEntities())
      {
        MySqlDataAdapter da = new MySqlDataAdapter("SELECT * FROM Companies ORDER BY Name DESC LIMIT 2,2", conn);
        DataTable dt = new DataTable();
        da.Fill(dt);

        int i = 0;
        var query = context.Companies.OrderByDescending(q => q.Name).Skip(2).Take(2);
        string sql = query.ToTraceString();
        CheckSql(sql, SQLSyntax.SkipAndTakeWithOrdering);
        foreach (Company c in query)
          Assert.AreEqual(dt.Rows[i++]["Name"], c.Name);
      }
    }

    /// <summary>
    /// Tests fix for bug #64749 - Entity Framework - Take().Count() fails with EntityCommandCompilationException.
    /// </summary>
    [Test]
    public void TakeWithCount()
    {
      using (testEntities context = new testEntities())
      {
        int cnt = context.Companies.Take(2).Count();
        Assert.AreEqual(2, cnt);
      }
    }
  }
}