using Strata.SqlTools.SqlBreakdown.Utilities;

namespace Strata.SqlTools.SqlBreakdown.Tests.Utilities;

[TestFixture]
public class GuidUtilsTests
{
    private static readonly Guid Sample = new("0123abcd-4567-89ef-0123-456789abcdef");

    #region TranslateGuid / UnTranslateGuid

    [Test]
    public void TranslateGuid_RemovesHyphensAndPrefixesWithG()
    {
        // Act
        var result = GuidUtils.TranslateGuid(Sample);

        Assert.Multiple(() =>
        {
            // Assert
            Assert.That(result, Does.StartWith("g"));
            Assert.That(result, Has.Length.EqualTo(33));
            Assert.That(result, Does.Not.Contain("-"));
        });
    }

    [Test]
    public void UnTranslateGuid_RoundTripsTranslateGuid()
    {
        // Arrange
        var translated = GuidUtils.TranslateGuid(Sample);

        // Act & Assert
        Assert.That(GuidUtils.UnTranslateGuid(translated), Is.EqualTo(Sample));
    }

    [Test]
    public void UnTranslateGuid_AlreadyHyphenated_ParsesDirectly()
    {
        // Act & Assert
        Assert.That(GuidUtils.UnTranslateGuid(Sample.ToString()), Is.EqualTo(Sample));
    }

    [TestCase("")]               // null/empty guard
    [TestCase("notprefixed")]    // no hyphen, does not start with 'g'
    [TestCase("gTOOSHORT")]      // starts with 'g' but wrong length (not 33)
    public void UnTranslateGuid_InvalidInputs_ReturnEmpty(string value)
    {
        // Act & Assert
        Assert.That(GuidUtils.UnTranslateGuid(value), Is.EqualTo(Guid.Empty));
    }

    #endregion

    #region SQL-safe column GUID

    [Test]
    public void GetSqlColumnSafeGuid_UppercasesAndReplacesHyphens()
    {
        // Act
        var result = GuidUtils.GetSqlColumnSafeGuid(Sample);

        Assert.Multiple(() =>
        {
            // Assert
            Assert.That(result, Does.StartWith("G"));
            Assert.That(result, Does.Not.Contain("-"));
            Assert.That(result, Does.Contain("_"));
        });
    }

    [Test]
    public void GetGuidFromSqlColumnSafeGuid_RoundTrips()
    {
        // Arrange
        var safe = GuidUtils.GetSqlColumnSafeGuid(Sample);

        // Act & Assert
        Assert.That(GuidUtils.GetGuidFromSqlColumnSafeGuid(safe), Is.EqualTo(Sample));
    }

    #endregion

    #region TranslateTextToGuid

    [Test]
    public void TranslateTextToGuid_IsDeterministic()
    {
        // Act & Assert - same input must always yield the same GUID
        Assert.That(GuidUtils.TranslateTextToGuid("hello world"), Is.EqualTo(GuidUtils.TranslateTextToGuid("hello world")));
    }

    [Test]
    public void TranslateTextToGuid_EmptyInput_ReturnsEmpty()
    {
        // Act & Assert
        Assert.That(GuidUtils.TranslateTextToGuid(string.Empty), Is.EqualTo(Guid.Empty));
    }

    [Test]
    public void TranslateTextToGuid_DifferentInputs_GenerallyDiffer()
    {
        // Act & Assert
        Assert.That(GuidUtils.TranslateTextToGuid("alpha"), Is.Not.EqualTo(GuidUtils.TranslateTextToGuid("beta")));
    }

    #endregion

    #region Validation

    [TestCase("0123abcd-4567-89ef-0123-456789abcdef", true)]
    [TestCase("not a guid", false)]
    [TestCase("", false)]
    public void IsGuid_String_ValidatesCorrectly(string value, bool expected)
    {
        // Act & Assert
        Assert.That(GuidUtils.IsGuid(value), Is.EqualTo(expected));
    }

    [Test]
    public void IsGuid_Object_GuidInstance_ReturnsTrue()
    {
        // Act & Assert
        Assert.That(GuidUtils.IsGuid((object)Sample), Is.True);
    }

    [Test]
    public void IsGuid_Object_GuidString_ReturnsTrue()
    {
        // Act & Assert
        Assert.That(GuidUtils.IsGuid((object)Sample.ToString()), Is.True);
    }

    [Test]
    public void IsGuid_Object_NonGuid_ReturnsFalse()
    {
        // Act & Assert
        Assert.That(GuidUtils.IsGuid((object)12345), Is.False);
    }

    #endregion

    #region FindFirstGuid / GetGuids

    [Test]
    public void FindFirstGuid_EmbeddedGuid_ReturnsIt()
    {
        // Act
        var result = GuidUtils.FindFirstGuid($"prefix {Sample} suffix");

        // Assert
        Assert.That(result, Is.EqualTo(Sample));
    }

    [Test]
    public void FindFirstGuid_NoGuid_ReturnsEmpty()
    {
        // Act & Assert
        Assert.That(GuidUtils.FindFirstGuid("nothing here"), Is.EqualTo(Guid.Empty));
    }

    [Test]
    public void GetGuids_ReturnsAllEmbeddedGuids()
    {
        // Arrange
        var second = new Guid("99999999-9999-9999-9999-999999999999");

        // Act
        var result = GuidUtils.GetGuids($"a {Sample} b {second} c");

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

    #endregion

    #region GetGuid

    [Test]
    public void GetGuid_ValidString_ParsesValue()
    {
        // Act & Assert
        Assert.That(GuidUtils.GetGuid(Sample.ToString()), Is.EqualTo(Sample));
    }

    [Test]
    public void GetGuid_InvalidString_ReturnsEmpty()
    {
        // Act & Assert
        Assert.That(GuidUtils.GetGuid("nope"), Is.EqualTo(Guid.Empty));
    }

    [Test]
    public void GetGuid_InvalidString_ReturnsProvidedDefault()
    {
        // Act & Assert
        Assert.That(GuidUtils.GetGuid("nope", Sample), Is.EqualTo(Sample));
    }

    [Test]
    public void GetGuid_NullObject_ReturnsEmpty()
    {
        // Act & Assert
        Assert.That(GuidUtils.GetGuid((object)null!), Is.EqualTo(Guid.Empty));
    }

    [Test]
    public void GetGuid_Object_ParsesToStringValue()
    {
        // Act & Assert
        Assert.That(GuidUtils.GetGuid((object)Sample.ToString()), Is.EqualTo(Sample));
    }

    #endregion
}