using Strata.SqlTools.Breakdowns.SqlServer;

namespace Strata.SqlTools.SqlServer.Tests.SqlServer;

[TestFixture]
public class QueryBreakdownCollectionTests
{
    private QueryBreakdownCollection _collection = null!;

    [SetUp]
    public void Setup()
    {
        _collection = new QueryBreakdownCollection();
    }

    [Test]
    public void Constructor_Empty_CreatesEmptyCollection()
    {
        // Act & Assert
        Assert.That(_collection, Is.Empty);
        Assert.That(_collection.QueryBreakdowns, Is.Empty);
    }

    [Test]
    public void Constructor_WithQueries_InitializesCollection()
    {
        // Arrange
        var queries = new List<QueryBreakdown>
        {
            new QueryBreakdown("ID, Name", "Users"),
            new QueryBreakdown("OrderID, Amount", "Orders")
        };

        // Act
        var collection = new QueryBreakdownCollection(queries);

        // Assert
        Assert.That(collection, Has.Count.EqualTo(2));
        Assert.That(collection.QueryBreakdowns, Has.Count.EqualTo(2));
    }

    [Test]
    public void Add_SingleQuery_AddsToCollection()
    {
        // Arrange
        var query = new QueryBreakdown("ID, Name", "Users");

        // Act
        _collection.Add(query);

        // Assert
        Assert.That(_collection, Has.Count.EqualTo(1));
        Assert.That(_collection.QueryBreakdowns[0], Is.EqualTo(query));
    }

    [Test]
    public void Add_NullQuery_ThrowsArgumentNullException()
    {
        // Act & Assert
        Assert.Throws<ArgumentNullException>(() => _collection.Add(null!));
    }

    [Test]
    public void AddRange_MultipleQueries_AddsAllQueries()
    {
        // Arrange
        var queries = new List<QueryBreakdown>
        {
            new QueryBreakdown("ID, Name", "Users"),
            new QueryBreakdown("OrderID, Amount", "Orders")
        };

        // Act
        _collection.AddRange(queries);

        // Assert
        Assert.That(_collection, Has.Count.EqualTo(2));
    }

    [Test]
    public void Remove_ExistingQuery_RemovesFromCollection()
    {
        // Arrange
        var query = new QueryBreakdown("ID, Name", "Users");
        _collection.Add(query);

        // Act
        var removed = _collection.Remove(query);

        // Assert
        Assert.That(removed, Is.True);
        Assert.That(_collection, Is.Empty);
    }

    [Test]
    public void Remove_NonExistentQuery_ReturnsFalse()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users");
        var query2 = new QueryBreakdown("OrderID, Amount", "Orders");
        _collection.Add(query1);

        // Act
        var removed = _collection.Remove(query2);

        // Assert
        Assert.That(removed, Is.False);
        Assert.That(_collection, Has.Count.EqualTo(1));
    }

    [Test]
    public void Clear_WithQueries_RemovesAllQueries()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));
        _collection.Add(new QueryBreakdown("OrderID, Amount", "Orders"));

        // Act
        _collection.Clear();

        // Assert
        Assert.That(_collection, Is.Empty);
    }

    [Test]
    public void GetSqlServerBatch_MultipleQueries_ContainsGoSeparators()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));
        _collection.Add(new QueryBreakdown("OrderID, Amount", "Orders"));

        // Act
        var sql = _collection.GetSqlServerBatch();

        // Assert
        Assert.That(sql, Does.Contain("GO"));
        Assert.That(sql, Does.Contain("SELECT"));
    }

    [Test]
    public void GetSqlServerBatch_WithTransaction_WrapsInTransaction()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));

        // Act
        var sql = _collection.GetSqlServerBatch(includeTransaction: true);

        // Assert
        Assert.That(sql, Does.Contain("BEGIN TRANSACTION"));
        Assert.That(sql, Does.Contain("COMMIT TRANSACTION"));
    }

    [Test]
    public void WhereSelectContains_MatchingColumn_ReturnsQuery()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name, Email", "Users");
        var query2 = new QueryBreakdown("OrderID, Amount", "Orders");
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        var results = _collection.WhereSelectContains("Email").ToList();

        // Assert
        Assert.That(results, Has.Count.EqualTo(1));
        Assert.That(results[0], Is.EqualTo(query1));
    }

    [Test]
    public void WhereSelectContains_CaseInsensitive_ReturnsQuery()
    {
        // Arrange
        var query = new QueryBreakdown("ID, Name, Email", "Users");
        _collection.Add(query);

        // Act
        var results = _collection.WhereSelectContains("email").ToList();

        // Assert
        Assert.That(results, Has.Count.EqualTo(1));
    }

    [Test]
    public void WhereTableContains_MatchingTable_ReturnsQuery()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users");
        var query2 = new QueryBreakdown("OrderID", "Orders");
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        var results = _collection.WhereTableContains("Users").ToList();

        // Assert
        Assert.That(results, Has.Count.EqualTo(1));
        Assert.That(results[0], Is.EqualTo(query1));
    }

    [Test]
    public void WhereHaveWhereClause_WithWhereClauses_ReturnsMatchingQueries()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users", "ID > 10");
        var query2 = new QueryBreakdown("OrderID", "Orders");
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        var results = _collection.WhereHaveWhereClause().ToList();

        // Assert
        Assert.That(results, Has.Count.EqualTo(1));
        Assert.That(results[0], Is.EqualTo(query1));
    }

    [Test]
    public void WhereHaveNoWhereClause_WithoutWhereClauses_ReturnsMatchingQueries()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users", "ID > 10");
        var query2 = new QueryBreakdown("OrderID", "Orders");
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        var results = _collection.WhereHaveNoWhereClause().ToList();

        // Assert
        Assert.That(results, Has.Count.EqualTo(1));
        Assert.That(results[0], Is.EqualTo(query2));
    }

    [Test]
    public void GetTotalSelectedColumns_MultipleQueries_SumsColumns()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name, Email", "Users"));
        _collection.Add(new QueryBreakdown("OrderID, Amount", "Orders"));

        // Act
        var columnCount = _collection.GetTotalSelectedColumns();

        // Assert
        Assert.That(columnCount, Is.EqualTo(5));
    }

    [Test]
    public void GetUniqueTableReferences_MultipleQueries_ReturnsUniqueTables()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));
        _collection.Add(new QueryBreakdown("OrderID, UserID", "Orders"));
        _collection.Add(new QueryBreakdown("ID", "Users"));

        // Act
        var tables = _collection.GetUniqueTableReferences().ToList();

        // Assert
        Assert.That(tables, Has.Count.EqualTo(2));
        Assert.That(tables, Does.Contain("Users"));
        Assert.That(tables, Does.Contain("Orders"));
    }

    [Test]
    public void GetQuerySummaries_MultipleQueries_ReturnsSummaryForEach()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));
        _collection.Add(new QueryBreakdown("OrderID, Amount", "Orders", "Amount > 100"));

        // Act
        var summaries = _collection.GetQuerySummaries().ToList();

        // Assert
        Assert.That(summaries, Has.Count.EqualTo(2));
        Assert.That(summaries[0].HasSelectClause, Is.True);
        Assert.That(summaries[1].HasWhereClause, Is.True);
    }

    [Test]
    public void SynchronizeParameters_ParametersInSomeQueries_SynchronizesAcrossQueries()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users", "ID = @UserId");
        var query2 = new QueryBreakdown("OrderID", "Orders", "UserID = @UserId");
        query1.Parameters["UserId"] = 123;
        query2.Parameters["UserId"] = 456;
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        _collection.SynchronizeParameters();

        // Assert
        // Both should have the same value (the last one)
        Assert.That(query1.Parameters["UserId"], Is.EqualTo(query2.Parameters["UserId"]));
    }

    [Test]
    public void SynchronizeParameters_OnlyUpdatesExistingParameters()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users", "ID = @UserId");
        var query2 = new QueryBreakdown("OrderID", "Orders");
        query1.Parameters["UserId"] = 123;
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        _collection.SynchronizeParameters();

        // Assert
        // query2 should NOT have UserId parameter added
        Assert.That(query2.Parameters.ContainsKey("UserId"), Is.False);
    }

    [Test]
    public void AddParameterToAll_AddsParameterToAllQueries()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users"));
        _collection.Add(new QueryBreakdown("OrderID", "Orders"));

        // Act
        _collection.AddParameterToAll("CompanyId", 99);

        // Assert
        Assert.That(_collection.QueryBreakdowns[0].Parameters["CompanyId"], Is.EqualTo(99));
        Assert.That(_collection.QueryBreakdowns[1].Parameters["CompanyId"], Is.EqualTo(99));
    }

    [Test]
    public void GetParameterUsageReport_WithParameters_ReturnsUsageReport()
    {
        // Arrange
        var query1 = new QueryBreakdown("ID, Name", "Users", "ID = @UserId");
        var query2 = new QueryBreakdown("OrderID", "Orders", "UserID = @UserId AND Status = @Status");
        query1.Parameters["UserId"] = 123;
        query2.Parameters["UserId"] = 123;
        query2.Parameters["Status"] = "Active";
        _collection.Add(query1);
        _collection.Add(query2);

        // Act
        var report = _collection.GetParameterUsageReport().ToList();

        // Assert
        Assert.That(report.Count, Is.GreaterThan(0));
        var userIdReport = report.FirstOrDefault(r => r.ParameterName == "UserId");
        Assert.That(userIdReport, Is.Not.Null);
        Assert.That(userIdReport?.UsedInQueryCount, Is.EqualTo(2));
    }

    [Test]
    public void GetParametersAsString_WithParameters_FormatsWithDataTypes()
    {
        // Arrange
        _collection.Add(new QueryBreakdown("ID, Name", "Users", "ID = @UserId"));
        _collection.QueryBreakdowns[0].Parameters["UserId"] = 123;

        // Act
        var paramString = _collection.GetParametersAsString(includeDataTypes: true);

        // Assert
        Assert.That(paramString, Does.Contain("@UserId"));
        Assert.That(paramString, Does.Contain("INT"));
    }
}