//
// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
//

//#define USE_LIVE_CONNECTION

using System;
using System.Data.Common;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.SqlTools.ServiceLayer.Connection;
using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol;
using Microsoft.SqlTools.ServiceLayer.Hosting.Protocol.Contracts;
using Microsoft.SqlTools.ServiceLayer.QueryExecution;
using Microsoft.SqlTools.ServiceLayer.QueryExecution.Contracts;
using Microsoft.SqlTools.ServiceLayer.SqlContext;
using Microsoft.SqlTools.ServiceLayer.Test.Utility;
using Microsoft.SqlTools.ServiceLayer.Workspace;
using Microsoft.SqlTools.ServiceLayer.Workspace.Contracts;
using Moq;
using Xunit;

namespace Microsoft.SqlTools.ServiceLayer.Test.QueryExecution
{
    public class ExecuteTests
    {
        #region Batch Class Tests

        [Fact]
        public void BatchCreationTest()
        {
            // If I create a new batch...
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());

            // Then: 
            // ... The text of the batch should be stored
            Assert.NotEmpty(batch.BatchText);

            // ... It should not have executed and no error
            Assert.False(batch.HasExecuted, "The query should not have executed.");
            Assert.False(batch.HasError, "The batch should not have an error");

            // ... The results should be empty
            Assert.Empty(batch.ResultSets);
            Assert.Empty(batch.ResultSummaries);
            Assert.Empty(batch.ResultMessages);

            // ... The start line of the batch should be 0
            Assert.Equal(0, batch.Selection.StartLine);

            // ... It's ordinal ID should be what I set it to
            Assert.Equal(Common.Ordinal, batch.Id);
        }

        [Fact]
        public void BatchExecuteNoResultSets()
        {
            // Setup: Create a callback for batch completion
            BatchSummary batchSummaryFromCallback = null;
            bool completionCallbackFired = false;
            Batch.BatchAsyncEventHandler callback = b =>
            {
                completionCallbackFired = true;
                batchSummaryFromCallback = b.Summary;
                return Task.FromResult(0);
            };

            // If I execute a query that should get no result sets
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());
            batch.BatchCompletion += callback;
            batch.Execute(GetConnection(Common.CreateTestConnectionInfo(null, false)), CancellationToken.None).Wait();

            // Then:
            // ... It should have executed without error
            Assert.True(batch.HasExecuted, "The query should have been marked executed.");
            Assert.False(batch.HasError, "The batch should not have an error");

            // ... The results should be empty
            Assert.Empty(batch.ResultSets);
            Assert.Empty(batch.ResultSummaries);

            // ... The results should not be null
            Assert.NotNull(batch.ResultSets);
            Assert.NotNull(batch.ResultSummaries);

            // ... There should be a message for how many rows were affected
            Assert.Equal(1, batch.ResultMessages.Count());

            // ... The callback for batch completion should have been fired
            Assert.True(completionCallbackFired);
            Assert.NotNull(batchSummaryFromCallback);
        }

        [Fact]
        public void BatchExecuteOneResultSet()
        {
            const int resultSets = 1;
            ConnectionInfo ci = Common.CreateTestConnectionInfo(new[] { Common.StandardTestData }, false);

            // Setup: Create a callback for batch completion
            BatchSummary batchSummaryFromCallback = null;
            bool completionCallbackFired = false;
            Batch.BatchAsyncEventHandler callback = b =>
            {
                completionCallbackFired = true;
                batchSummaryFromCallback = b.Summary;
                return Task.FromResult(0);
            };

            // If I execute a query that should get one result set
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());
            batch.BatchCompletion += callback;
            batch.Execute(GetConnection(ci), CancellationToken.None).Wait();

            // Then:
            // ... It should have executed without error
            Assert.True(batch.HasExecuted, "The batch should have been marked executed.");
            Assert.False(batch.HasError, "The batch should not have an error");

            // ... There should be exactly one result set
            Assert.Equal(resultSets, batch.ResultSets.Count());
            Assert.Equal(resultSets, batch.ResultSummaries.Length);

            // ... Inside the result set should be with 5 rows
            Assert.Equal(Common.StandardRows, batch.ResultSets.First().RowCount);
            Assert.Equal(Common.StandardRows, batch.ResultSummaries[0].RowCount);

            // ... Inside the result set should have 5 columns
            Assert.Equal(Common.StandardColumns, batch.ResultSets.First().Columns.Length);
            Assert.Equal(Common.StandardColumns, batch.ResultSummaries[0].ColumnInfo.Length);

            // ... There should be a message for how many rows were affected
            Assert.Equal(resultSets, batch.ResultMessages.Count());

            // ... The callback for batch completion should have been fired
            Assert.True(completionCallbackFired);
            Assert.NotNull(batchSummaryFromCallback);
        }

        [Fact]
        public void BatchExecuteTwoResultSets()
        {
            var dataset = new[] { Common.StandardTestData, Common.StandardTestData };
            int resultSets = dataset.Length;
            ConnectionInfo ci = Common.CreateTestConnectionInfo(dataset, false);

            // Setup: Create a callback for batch completion
            BatchSummary batchSummaryFromCallback = null;
            bool completionCallbackFired = false;
            Batch.BatchAsyncEventHandler callback = b =>
            {
                completionCallbackFired = true;
                batchSummaryFromCallback = b.Summary;
                return Task.FromResult(0);
            };

            // If I execute a query that should get two result sets
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());
            batch.BatchCompletion += callback;
            batch.Execute(GetConnection(ci), CancellationToken.None).Wait();

            // Then:
            // ... It should have executed without error
            Assert.True(batch.HasExecuted, "The batch should have been marked executed.");
            Assert.False(batch.HasError, "The batch should not have an error");

            // ... There should be exactly two result sets
            Assert.Equal(resultSets, batch.ResultSets.Count());

            foreach (ResultSet rs in batch.ResultSets)
            {
                // ... Each result set should have 5 rows
                Assert.Equal(Common.StandardRows, rs.RowCount);

                // ... Inside each result set should be 5 columns
                Assert.Equal(Common.StandardColumns, rs.Columns.Length);
            }

            // ... There should be exactly two result set summaries
            Assert.Equal(resultSets, batch.ResultSummaries.Length);

            foreach (ResultSetSummary rs in batch.ResultSummaries)
            {
                // ... Inside each result summary, there should be 5 rows
                Assert.Equal(Common.StandardRows, rs.RowCount);

                // ... Inside each result summary, there should be 5 column definitions
                Assert.Equal(Common.StandardColumns, rs.ColumnInfo.Length);
            }

            // ... The callback for batch completion should have been fired
            Assert.True(completionCallbackFired);
            Assert.NotNull(batchSummaryFromCallback);
        }

        [Fact]
        public void BatchExecuteInvalidQuery()
        {
            // Setup: Create a callback for batch completion
            BatchSummary batchSummaryFromCallback = null;
            bool completionCallbackFired = false;
            Batch.BatchAsyncEventHandler callback = b =>
            {
                completionCallbackFired = true;
                batchSummaryFromCallback = b.Summary;
                return Task.FromResult(0);
            };

            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, true);

            // If I execute a batch that is invalid
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());
            batch.BatchCompletion += callback;
            batch.Execute(GetConnection(ci), CancellationToken.None).Wait();

            // Then:
            // ... It should have executed with error
            Assert.True(batch.HasExecuted);
            Assert.True(batch.HasError);

            // ... There should be no result sets
            Assert.Empty(batch.ResultSets);
            Assert.Empty(batch.ResultSummaries);

            // ... There should be plenty of messages for the error
            Assert.NotEmpty(batch.ResultMessages);

            // ... The callback for batch completion should have been fired
            Assert.True(completionCallbackFired);
            Assert.NotNull(batchSummaryFromCallback);
        }

        [Fact]
        public async Task BatchExecuteExecuted()
        {
            // Setup: Create a callback for batch completion
            BatchSummary batchSummaryFromCallback = null;
            bool completionCallbackFired = false;
            Batch.BatchAsyncEventHandler callback = b =>
            {
                completionCallbackFired = true;
                batchSummaryFromCallback = b.Summary;
                return Task.FromResult(0);
            };

            ConnectionInfo ci = Common.CreateTestConnectionInfo(new[] { Common.StandardTestData }, false);

            // If I execute a batch
            Batch batch = new Batch(Common.StandardQuery, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory());
            batch.BatchCompletion += callback;
            batch.Execute(GetConnection(ci), CancellationToken.None).Wait();

            // Then:
            // ... It should have executed without error
            Assert.True(batch.HasExecuted, "The batch should have been marked executed.");
            Assert.False(batch.HasError, "The batch should not have an error");

            // ... The callback for batch completion should have been fired
            Assert.True(completionCallbackFired);
            Assert.NotNull(batchSummaryFromCallback);

            // If I execute it again
            // Then:
            // ... It should throw an invalid operation exception
            await Assert.ThrowsAsync<InvalidOperationException>(() =>
                batch.Execute(GetConnection(ci), CancellationToken.None));

            // ... The data should still be available without error
            Assert.False(batch.HasError, "The batch should not be in an error condition");
            Assert.True(batch.HasExecuted, "The batch should still be marked executed.");
            Assert.NotEmpty(batch.ResultSets);
            Assert.NotEmpty(batch.ResultSummaries);
        }

        [Theory]
        [InlineData("")]
        [InlineData(null)]
        public void BatchExecuteNoSql(string query)
        {
            // If:
            // ... I create a batch that has an empty query
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentException>(() => new Batch(query, Common.SubsectionDocument, Common.Ordinal, Common.GetFileStreamFactory()));
        }

        [Fact]
        public void BatchNoBufferFactory()
        {
            // If:
            // ... I create a batch that has no file stream factory
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentNullException>(() => new Batch("stuff", Common.SubsectionDocument, Common.Ordinal, null));
        }

        [Fact]
        public void BatchInvalidOrdinal()
        {
            // If:
            // ... I create a batch has has an ordinal less than 0
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentOutOfRangeException>(() => new Batch("stuff", Common.SubsectionDocument, -1, Common.GetFileStreamFactory()));
        }

        #endregion

        #region Query Class Tests

        [Fact]
        public void QueryExecuteNoQueryText()
        {
            // If:
            // ... I create a query that has a null query text
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentException>(() =>
                new Query(null, Common.CreateTestConnectionInfo(null, false), new QueryExecutionSettings(), Common.GetFileStreamFactory()));
        }

        [Fact]
        public void QueryExecuteNoConnectionInfo()
        {
            // If:
            // ... I create a query that has a null connection info
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentNullException>(() => new Query("Some Query", null, new QueryExecutionSettings(), Common.GetFileStreamFactory()));
        }

        [Fact]
        public void QueryExecuteNoSettings()
        {
            // If:
            // ... I create a query that has a null settings
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentNullException>(() =>
                new Query("Some query", Common.CreateTestConnectionInfo(null, false), null, Common.GetFileStreamFactory()));
        }

        [Fact]
        public void QueryExecuteNoBufferFactory()
        {
            // If:
            // ... I create a query that has a null file stream factory
            // Then:
            // ... It should throw an exception
            Assert.Throws<ArgumentNullException>(() =>
                new Query("Some query", Common.CreateTestConnectionInfo(null, false), new QueryExecutionSettings(),null));
        }

        [Fact]
        public void QueryExecuteSingleBatch()
        {
            // Setup:
            // ... Create a callback for batch completion
            int batchCallbacksReceived = 0;
            Batch.BatchAsyncEventHandler batchCallback = summary =>
            {
                batchCallbacksReceived++;
                return Task.CompletedTask;
            };

            // If:
            // ... I create a query from a single batch (without separator)
            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, false);
            Query query = new Query(Common.StandardQuery, ci, new QueryExecutionSettings(), Common.GetFileStreamFactory());
            query.BatchCompleted += batchCallback;

            // Then:
            // ... I should get a single batch to execute that hasn't been executed
            Assert.NotEmpty(query.QueryText);
            Assert.NotEmpty(query.Batches);
            Assert.Equal(1, query.Batches.Length);
            Assert.False(query.HasExecuted);
            Assert.Throws<InvalidOperationException>(() => query.BatchSummaries);

            // If:
            // ... I then execute the query
            query.Execute();
            query.ExecutionTask.Wait();

            // Then:
            // ... The query should have completed successfully with one batch summary returned
            Assert.True(query.HasExecuted);
            Assert.NotEmpty(query.BatchSummaries);
            Assert.Equal(1, query.BatchSummaries.Length);

            // ... The batch callback should have been called precisely 1 time
            Assert.Equal(1, batchCallbacksReceived);
        }

        [Fact]
        public void QueryExecuteNoOpBatch()
        {
            // Setup:
            // ... Create a callback for batch completion
            Batch.BatchAsyncEventHandler batchCallback = summary =>
            {
                throw new Exception("Batch completion callback was called");
            };

            // If:
            // ... I create a query from a single batch that does nothing
            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, false);
            Query query = new Query(Common.NoOpQuery, ci, new QueryExecutionSettings(), Common.GetFileStreamFactory());
            query.BatchCompleted += batchCallback;

            // Then:
            // ... I should get no batches back
            Assert.NotEmpty(query.QueryText);
            Assert.Empty(query.Batches);
            Assert.False(query.HasExecuted);
            Assert.Throws<InvalidOperationException>(() => query.BatchSummaries);

            // If:
            // ... I Then execute the query
            query.Execute();
            query.ExecutionTask.Wait();

            // Then:
            // ... The query should have completed successfully with no batch summaries returned
            Assert.True(query.HasExecuted);
            Assert.Empty(query.BatchSummaries);
        }

        [Fact]
        public void QueryExecuteMultipleBatches()
        {
            // Setup:
            // ... Create a callback for batch completion
            int batchCallbacksReceived = 0;
            Batch.BatchAsyncEventHandler batchCallback = summary =>
            {
                batchCallbacksReceived++;
                return Task.CompletedTask;
            };

            // If:
            // ... I create a query from two batches (with separator)
            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, false);
            string queryText = string.Format("{0}\r\nGO\r\n{0}", Common.StandardQuery);
            Query query = new Query(queryText, ci, new QueryExecutionSettings(), Common.GetFileStreamFactory());
            query.BatchCompleted += batchCallback;

            // Then:
            // ... I should get back two batches to execute that haven't been executed
            Assert.NotEmpty(query.QueryText);
            Assert.NotEmpty(query.Batches);
            Assert.Equal(2, query.Batches.Length);
            Assert.False(query.HasExecuted);
            Assert.Throws<InvalidOperationException>(() => query.BatchSummaries);

            // If:
            // ... I then execute the query
            query.Execute();
            query.ExecutionTask.Wait();

            // Then:
            // ... The query should have completed successfully with two batch summaries returned
            Assert.True(query.HasExecuted);
            Assert.NotEmpty(query.BatchSummaries);
            Assert.Equal(2, query.BatchSummaries.Length);

            // ... The batch callback should have been called precisely 2 times
            Assert.Equal(2, batchCallbacksReceived);
        }

        [Fact]
        public void QueryExecuteMultipleBatchesWithNoOp()
        {
            // Setup:
            // ... Create a callback for batch completion
            int batchCallbacksReceived = 0;
            Batch.BatchAsyncEventHandler batchCallback = summary =>
            {
                batchCallbacksReceived++;
                return Task.CompletedTask;
            };

            // If:
            // ... I create a query from a two batches (with separator)
            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, false);
            string queryText = string.Format("{0}\r\nGO\r\n{1}", Common.StandardQuery, Common.NoOpQuery);
            Query query = new Query(queryText, ci, new QueryExecutionSettings(), Common.GetFileStreamFactory());
            query.BatchCompleted += batchCallback;

            // Then:
            // ... I should get back one batch to execute that hasn't been executed
            Assert.NotEmpty(query.QueryText);
            Assert.NotEmpty(query.Batches);
            Assert.Equal(1, query.Batches.Length);
            Assert.False(query.HasExecuted);
            Assert.Throws<InvalidOperationException>(() => query.BatchSummaries);

            // If:
            // .. I then execute the query
            query.Execute();
            query.ExecutionTask.Wait();

            // ... The query should have completed successfully with one batch summary returned
            Assert.True(query.HasExecuted);
            Assert.NotEmpty(query.BatchSummaries);
            Assert.Equal(1, query.BatchSummaries.Length);

            // ... The batch callback should have been called precisely 1 time
            Assert.Equal(1, batchCallbacksReceived);
        }

        [Fact]
        public void QueryExecuteInvalidBatch()
        {
            // Setup:
            // ... Create a callback for batch completion
            int batchCallbacksReceived = 0;
            Batch.BatchAsyncEventHandler batchCallback = summary =>
            {
                batchCallbacksReceived++;
                return Task.CompletedTask;
            };

            // If:
            // ... I create a query from an invalid batch
            ConnectionInfo ci = Common.CreateTestConnectionInfo(null, true);
            Query query = new Query(Common.InvalidQuery, ci, new QueryExecutionSettings(), Common.GetFileStreamFactory());
            query.BatchCompleted += batchCallback;

            // Then:
            // ... I should get back a query with one batch not executed
            Assert.NotEmpty(query.QueryText);
            Assert.NotEmpty(query.Batches);
            Assert.Equal(1, query.Batches.Length);
            Assert.False(query.HasExecuted);
            Assert.Throws<InvalidOperationException>(() => query.BatchSummaries);

            // If:
            // ... I then execute the query
            query.Execute();
            query.ExecutionTask.Wait();

            // Then:
            // ... There should be an error on the batch
            Assert.True(query.HasExecuted);
            Assert.NotEmpty(query.BatchSummaries);
            Assert.Equal(1, query.BatchSummaries.Length);
            Assert.True(query.BatchSummaries[0].HasError);
            Assert.NotEmpty(query.BatchSummaries[0].Messages);

            // ... The batch callback should have been called once
            Assert.Equal(1, batchCallbacksReceived);
        }

        #endregion

        #region Service Tests

        [Fact]
        public async void QueryExecuteValidNoResultsTest()
        {
            // Given:
            // ... Default settings are stored in the workspace service
            WorkspaceService<SqlToolsSettings>.Instance.CurrentSettings = new SqlToolsSettings();

            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns(Common.StandardQuery);
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);
            // If:
            // ... I request to execute a valid query with no results
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, false), true, workspaceService.Object);
            var queryParams = new QueryExecuteParams { QuerySelection = Common.WholeDocument, OwnerUri = Common.OwnerUri };

            QueryExecuteResult result = null;
            QueryExecuteCompleteParams completeParams = null;
            QueryExecuteBatchCompleteParams batchCompleteParams = null;
            var requestContext = RequestContextMocks.Create<QueryExecuteResult>(qer => result = qer)
                .AddEventHandling(QueryExecuteCompleteEvent.Type, (et, p) => completeParams = p)
                .AddEventHandling(QueryExecuteBatchCompleteEvent.Type, (et, p) => batchCompleteParams = p);
            queryService.HandleExecuteRequest(queryParams, requestContext.Object).Wait();

            // Then:
            // ... No Errors should have been sent
            // ... A successful result should have been sent with messages on the first batch
            // ... A completion event should have been fired with empty results
            // ... A batch completion event should have been fired with empty results
            VerifyQueryExecuteCallCount(requestContext, Times.Once(), Times.Once(), Times.Once(), Times.Never());
            Assert.Null(result.Messages);

            Assert.Equal(1, completeParams.BatchSummaries.Length);
            Assert.Empty(completeParams.BatchSummaries[0].ResultSetSummaries);
            Assert.NotEmpty(completeParams.BatchSummaries[0].Messages);

            Assert.NotNull(batchCompleteParams);
            Assert.Empty(batchCompleteParams.BatchSummary.ResultSetSummaries);
            Assert.NotEmpty(batchCompleteParams.BatchSummary.Messages);
            Assert.Equal(completeParams.OwnerUri, batchCompleteParams.OwnerUri);

            // ... There should be one active query
            Assert.Equal(1, queryService.ActiveQueries.Count);
        }

        [Fact]
        public async void QueryExecuteValidResultsTest()
        {
            
            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns(Common.StandardQuery);
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);
            // If:
            // ... I request to execute a valid query with results
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(new[] { Common.StandardTestData }, false), true,
                workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = Common.OwnerUri, QuerySelection = Common.WholeDocument };

            QueryExecuteResult result = null;
            QueryExecuteCompleteParams completeParams = null;
            QueryExecuteBatchCompleteParams batchCompleteParams = null;
            var requestContext = RequestContextMocks.Create<QueryExecuteResult>(qer => result = qer)
                .AddEventHandling(QueryExecuteCompleteEvent.Type, (et, p) => completeParams = p)
                .AddEventHandling(QueryExecuteBatchCompleteEvent.Type, (et, p) => batchCompleteParams = p);
            queryService.HandleExecuteRequest(queryParams, requestContext.Object).Wait();

            // Then:
            // ... No errors should have been sent
            // ... A successful result should have been sent with messages
            // ... A completion event should have been fired with one result
            VerifyQueryExecuteCallCount(requestContext, Times.Once(), Times.Once(), Times.Once(), Times.Never());
            Assert.Null(result.Messages);

            Assert.Equal(1, completeParams.BatchSummaries.Length);
            Assert.NotEmpty(completeParams.BatchSummaries[0].ResultSetSummaries);
            Assert.NotEmpty(completeParams.BatchSummaries[0].Messages);
            Assert.False(completeParams.BatchSummaries[0].HasError);

            Assert.NotNull(batchCompleteParams);
            Assert.NotEmpty(batchCompleteParams.BatchSummary.ResultSetSummaries);
            Assert.NotEmpty(batchCompleteParams.BatchSummary.Messages);
            Assert.Equal(completeParams.OwnerUri, batchCompleteParams.OwnerUri);

            // ... There should be one active query
            Assert.Equal(1, queryService.ActiveQueries.Count);
        }

        [Fact]
        public async void QueryExecuteUnconnectedUriTest()
        {

            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            // If:
            // ... I request to execute a query using a file URI that isn't connected
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, false), false, workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = "notConnected", QuerySelection = Common.WholeDocument };

            object error = null;
            var requestContext = RequestContextMocks.Create<QueryExecuteResult>(null)
                .AddErrorHandling(e => error = e);
            queryService.HandleExecuteRequest(queryParams, requestContext.Object).Wait();

            // Then:
            // ... An error should have been returned
            // ... No result should have been returned
            // ... No completion event should have been fired
            // ... There should be no active queries
            VerifyQueryExecuteCallCount(requestContext, Times.Never(), Times.Never(), Times.Never(), Times.Once());
            Assert.IsType<string>(error);
            Assert.NotEmpty((string)error);
            Assert.Empty(queryService.ActiveQueries);
        }

        [Fact]
        public async void QueryExecuteInProgressTest()
        {

            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns(Common.StandardQuery);
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);

            // If:
            // ... I request to execute a query
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, false), true, workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = Common.OwnerUri, QuerySelection = Common.WholeDocument };

            // Note, we don't care about the results of the first request
            var firstRequestContext = RequestContextMocks.Create<QueryExecuteResult>(null);
            await AwaitExecution(queryService, queryParams, firstRequestContext.Object);

            // ... And then I request another query without waiting for the first to complete
            queryService.ActiveQueries[Common.OwnerUri].HasExecuted = false;   // Simulate query hasn't finished
            object error = null;
            var secondRequestContext = RequestContextMocks.Create<QueryExecuteResult>(null)
                .AddErrorHandling(e => error = e);
            await AwaitExecution(queryService, queryParams, secondRequestContext.Object);

            // Then:
            // ... An error should have been sent
            // ... A result should have not have been sent
            // ... No completion event should have been fired
            // ... There should only be one active query
            VerifyQueryExecuteCallCount(secondRequestContext, Times.Never(), Times.AtMostOnce(), Times.AtMostOnce(), Times.Once());
            Assert.IsType<string>(error);
            Assert.NotEmpty((string)error);
            Assert.Equal(1, queryService.ActiveQueries.Count);
        }

        [Fact]
        public async void QueryExecuteCompletedTest()
        {
            
            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns(Common.StandardQuery);
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);
                
            // If:
            // ... I request to execute a query
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, false), true, workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = Common.OwnerUri, QuerySelection = Common.WholeDocument };

            // Note, we don't care about the results of the first request
            var firstRequestContext = RequestContextMocks.Create<QueryExecuteResult>(null);

            queryService.HandleExecuteRequest(queryParams, firstRequestContext.Object).Wait();

            // ... And then I request another query after waiting for the first to complete
            QueryExecuteResult result = null;
            QueryExecuteCompleteParams complete = null;
            QueryExecuteBatchCompleteParams batchComplete = null;
            var secondRequestContext = RequestContextMocks.Create<QueryExecuteResult>(qer => result = qer)
                .AddEventHandling(QueryExecuteCompleteEvent.Type, (et, qecp) => complete = qecp)
                .AddEventHandling(QueryExecuteBatchCompleteEvent.Type, (et, p) => batchComplete = p);
            queryService.HandleExecuteRequest(queryParams, secondRequestContext.Object).Wait();

            // Then:
            // ... No errors should have been sent
            // ... A result should have been sent with no errors
            // ... There should only be one active query
            VerifyQueryExecuteCallCount(secondRequestContext, Times.Once(), Times.Once(), Times.Once(), Times.Never());
            Assert.Null(result.Messages);

            Assert.False(complete.BatchSummaries.Any(b => b.HasError));
            Assert.Equal(1, queryService.ActiveQueries.Count);

            Assert.NotNull(batchComplete);
            Assert.False(batchComplete.BatchSummary.HasError);
            Assert.Equal(complete.OwnerUri, batchComplete.OwnerUri);
        }

        [Fact]
        public async Task QueryExecuteMissingSelectionTest()
        {

            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns("");
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);
            // If:
            // ... I request to execute a query with a missing query string
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, false), true, workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = Common.OwnerUri, QuerySelection = null };

            object errorResult = null;
            var requestContext = RequestContextMocks.Create<QueryExecuteResult>(null)
                .AddErrorHandling(error => errorResult = error);
            await queryService.HandleExecuteRequest(queryParams, requestContext.Object);


            // Then:
            // ... Am error should have been sent
            // ... No result should have been sent
            // ... No completion event should have been fired
            // ... An active query should not have been added
            VerifyQueryExecuteCallCount(requestContext, Times.Never(), Times.Never(), Times.Never(), Times.Once());
            Assert.NotNull(errorResult);
            Assert.IsType<string>(errorResult);
            Assert.DoesNotContain(Common.OwnerUri, queryService.ActiveQueries.Keys);

            // ... There should not be an active query
            Assert.Empty(queryService.ActiveQueries);
        }

        [Fact]
        public async void QueryExecuteInvalidQueryTest()
        {
            // Set up file for returning the query
            var fileMock = new Mock<ScriptFile>();
            fileMock.SetupGet(file => file.Contents).Returns(Common.StandardQuery);
            // Set up workspace mock
            var workspaceService = new Mock<WorkspaceService<SqlToolsSettings>>();
            workspaceService.Setup(service => service.Workspace.GetFile(It.IsAny<string>()))
                .Returns(fileMock.Object);
            // If:
            // ... I request to execute a query that is invalid
            var queryService = await Common.GetPrimedExecutionService(Common.CreateMockFactory(null, true), true, workspaceService.Object);
            var queryParams = new QueryExecuteParams { OwnerUri = Common.OwnerUri, QuerySelection = Common.WholeDocument };

            QueryExecuteResult result = null;
            QueryExecuteCompleteParams complete = null;
            QueryExecuteBatchCompleteParams batchComplete = null;
            var requestContext = RequestContextMocks.Create<QueryExecuteResult>(qer => result = qer)
                .AddEventHandling(QueryExecuteCompleteEvent.Type, (et, qecp) => complete = qecp)
                .AddEventHandling(QueryExecuteBatchCompleteEvent.Type, (et, p) => batchComplete = p);
            queryService.HandleExecuteRequest(queryParams, requestContext.Object).Wait();

            // Then:
            // ... No errors should have been sent
            // ... A result should have been sent with success (we successfully started the query)
            // ... A completion event should have been sent with error
            VerifyQueryExecuteCallCount(requestContext, Times.Once(), Times.Once(), Times.Once(), Times.Never());
            Assert.Null(result.Messages);

            Assert.Equal(1, complete.BatchSummaries.Length);
            Assert.True(complete.BatchSummaries[0].HasError);
            Assert.NotEmpty(complete.BatchSummaries[0].Messages);

            Assert.NotNull(batchComplete);
            Assert.True(batchComplete.BatchSummary.HasError);
            Assert.NotEmpty(batchComplete.BatchSummary.Messages);
            Assert.Equal(complete.OwnerUri, batchComplete.OwnerUri);
        }

#if USE_LIVE_CONNECTION
        [Fact]
        public void QueryUdtShouldNotRetry()
        {
            // If:
            // ... I create a query with a udt column in the result set
            ConnectionInfo connectionInfo = TestObjects.GetTestConnectionInfo();
            Query query = new Query(Common.UdtQuery, connectionInfo, new QueryExecutionSettings(), Common.GetFileStreamFactory());

            // If:
            // ... I then execute the query
            DateTime startTime = DateTime.Now;
            query.Execute().Wait();

            // Then:
            // ... The query should complete within 2 seconds since retry logic should not kick in
            Assert.True(DateTime.Now.Subtract(startTime) < TimeSpan.FromSeconds(2), "Query completed slower than expected, did retry logic execute?");

            // Then:
            // ... There should be an error on the batch
            Assert.True(query.HasExecuted);
            Assert.NotEmpty(query.BatchSummaries);
            Assert.Equal(1, query.BatchSummaries.Length);
            Assert.True(query.BatchSummaries[0].HasError);
            Assert.NotEmpty(query.BatchSummaries[0].Messages);
        }
#endif

        #endregion

        private static void VerifyQueryExecuteCallCount(Mock<RequestContext<QueryExecuteResult>> mock, Times sendResultCalls, 
            Times sendCompletionEventCalls, Times sendBatchCompletionEvent, Times sendErrorCalls)
        {
            mock.Verify(rc => rc.SendResult(It.IsAny<QueryExecuteResult>()), sendResultCalls);
            mock.Verify(rc => rc.SendEvent(
                It.Is<EventType<QueryExecuteCompleteParams>>(m => m == QueryExecuteCompleteEvent.Type),
                It.IsAny<QueryExecuteCompleteParams>()), sendCompletionEventCalls);
            mock.Verify(rc => rc.SendEvent(
                It.Is<EventType<QueryExecuteBatchCompleteParams>>(m => m == QueryExecuteBatchCompleteEvent.Type),
                It.IsAny<QueryExecuteBatchCompleteParams>()), sendBatchCompletionEvent);
            mock.Verify(rc => rc.SendError(It.IsAny<object>()), sendErrorCalls);
        }

        private static DbConnection GetConnection(ConnectionInfo info)
        {
            return info.Factory.CreateSqlConnection(ConnectionService.BuildConnectionString(info.ConnectionDetails));
        }

        private static async Task AwaitExecution(QueryExecutionService service, QueryExecuteParams qeParams,
            RequestContext<QueryExecuteResult> requestContext)
        {
            await service.HandleExecuteRequest(qeParams, requestContext);
            await service.ActiveQueries[qeParams.OwnerUri].ExecutionTask;
        }
    }
}