using JdeScoping.DataSync.Configuration;
using JdeScoping.DataSync.Services;
using Shouldly;
using Xunit;

namespace JdeScoping.DataSync.Tests.Services;

public class PipelineValidatorTests
{
    private readonly IPipelineValidator _validator;

    public PipelineValidatorTests()
    {
        _validator = new PipelineValidator();
    }

    #region Name/Filename Matching

    [Fact]
    public void Validate_NameMatchesFilename_Passes()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue();
        result.Errors.ShouldBeEmpty();
    }

    [Fact]
    public void Validate_NameMismatchFilename_Fails()
    {
        // Arrange
        var pipeline = CreateValidPipeline("WrongName");

        // Act
        var result = _validator.Validate(pipeline, "pipeline.CorrectName.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("does not match filename", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_NameCaseInsensitive_Passes()
    {
        // Arrange
        var pipeline = CreateValidPipeline("testpipeline");

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue();
    }

    #endregion

    #region Source Validation

    [Fact]
    public void Validate_MissingSource_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = null!,
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("Source is required", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_MissingSourceConnection_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = new SourceElement
            {
                Connection = "",
                Query = "SELECT * FROM table"
            },
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("Connection is required", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_InvalidConnection_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = new SourceElement
            {
                Connection = "invalid_db",
                Query = "SELECT * FROM table"
            },
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("not valid", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_ValidConnections_Pass()
    {
        // Arrange & Act & Assert
        foreach (var connection in new[] { "jde", "cms", "giw", "lotfinder" })
        {
            var pipeline = CreateValidPipeline("TestPipeline");
            pipeline.Source.Connection = connection;

            var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");
            result.IsValid.ShouldBeTrue($"Connection '{connection}' should be valid");
        }
    }

    [Fact]
    public void Validate_MissingSourceQuery_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = new SourceElement
            {
                Connection = "jde",
                Query = ""
            },
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("Query is required", StringComparison.OrdinalIgnoreCase));
    }

    #endregion

    #region Destination Validation

    [Fact]
    public void Validate_MissingDestination_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = CreateValidSource(),
            Destination = null!
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("Destination is required", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_MissingDestinationTable_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = CreateValidSource(),
            Destination = new DestinationElement
            {
                Table = "",
                MatchColumns = ["Id"]
            }
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("Table is required", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_EmptyMatchColumns_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            Source = CreateValidSource(),
            Destination = new DestinationElement
            {
                Table = "TestTable",
                MatchColumns = []
            }
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("MatchColumns", StringComparison.OrdinalIgnoreCase));
    }

    #endregion

    #region Interval Validation

    [Fact]
    public void Validate_EnabledWithoutAnyInterval_Fails()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            IsManualOnly = false,
            // No intervals set
            Source = CreateValidSource(),
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("At least one sync interval", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_ManualOnlyWithoutInterval_Passes()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            IsManualOnly = true,
            // No intervals set - ok for manual-only
            Source = CreateValidSource(),
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue();
    }

    [Fact]
    public void Validate_DisabledWithoutInterval_Passes()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = false,
            // No intervals set - ok for disabled
            Source = CreateValidSource(),
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue();
    }

    [Fact]
    public void Validate_ZeroMassInterval_Fails()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");
        pipeline.MassSyncIntervalMinutes = 0;

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("MassSyncIntervalMinutes must be greater than 0", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_NegativeInterval_Fails()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");
        pipeline.DailySyncIntervalMinutes = -60;

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("DailySyncIntervalMinutes must be greater than 0", StringComparison.OrdinalIgnoreCase));
    }

    #endregion

    #region Warning Cases

    [Fact]
    public void Validate_HourlyWithoutDaily_ReturnsWarning()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "TestPipeline",
            IsEnabled = true,
            HourlySyncIntervalMinutes = 15,
            // No daily interval
            Source = CreateValidSource(),
            Destination = CreateValidDestination()
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue(); // Warnings don't fail validation
        result.Warnings.ShouldContain(w => w.Contains("daily", StringComparison.OrdinalIgnoreCase));
    }

    #endregion

    #region Script Validation

    [Fact]
    public void Validate_PreScriptWithEmptyScript_Fails()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");
        pipeline.PreScripts = [new ScriptElement { Script = "" }];

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("PreScripts", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_PostScriptWithEmptyScript_Fails()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");
        pipeline.PostScripts = [new ScriptElement { Script = "" }];

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeFalse();
        result.Errors.ShouldContain(e => e.Contains("PostScripts", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void Validate_ValidScripts_Passes()
    {
        // Arrange
        var pipeline = CreateValidPipeline("TestPipeline");
        pipeline.PreScripts = [new ScriptElement { Script = "TRUNCATE TABLE Staging" }];
        pipeline.PostScripts = [new ScriptElement { Script = "EXEC ProcessData" }];

        // Act
        var result = _validator.Validate(pipeline, "pipeline.TestPipeline.json");

        // Assert
        result.IsValid.ShouldBeTrue();
    }

    #endregion

    #region Complete Valid Pipeline

    [Fact]
    public void Validate_CompleteValidPipeline_Passes()
    {
        // Arrange
        var pipeline = new EtlPipelineConfig
        {
            Name = "WorkOrder_Curr",
            IsEnabled = true,
            MassSyncIntervalMinutes = 1440,
            DailySyncIntervalMinutes = 60,
            HourlySyncIntervalMinutes = 15,
            Source = new SourceElement
            {
                Connection = "jde",
                Query = "SELECT * FROM WorkOrders WHERE ModDate > @lastSync",
                MassQuery = "SELECT * FROM WorkOrders"
            },
            Destination = new DestinationElement
            {
                Table = "WorkOrder_Curr",
                MatchColumns = ["OrderNumber"]
            }
        };

        // Act
        var result = _validator.Validate(pipeline, "pipeline.WorkOrder_Curr.json");

        // Assert
        result.IsValid.ShouldBeTrue();
        result.Errors.ShouldBeEmpty();
    }

    #endregion

    #region Helper Methods

    private static EtlPipelineConfig CreateValidPipeline(string name) => new()
    {
        Name = name,
        IsEnabled = true,
        MassSyncIntervalMinutes = 1440,
        Source = CreateValidSource(),
        Destination = CreateValidDestination()
    };

    private static SourceElement CreateValidSource() => new()
    {
        Connection = "jde",
        Query = "SELECT * FROM TestTable"
    };

    private static DestinationElement CreateValidDestination() => new()
    {
        Table = "TestTable",
        MatchColumns = ["Id"]
    };

    #endregion
}