using ZB.MOM.WW.ScadaBridge.Commons.Types.Deployment;

namespace ZB.MOM.WW.ScadaBridge.Commons.Tests;

public class DeploymentFetchTokenTests
{
    /// <summary>Verifies that generate, returns url safe token of adequate length.</summary>
    [Fact]
    public void Generate_ReturnsUrlSafeTokenOfAdequateLength()
    {
        var token = DeploymentFetchToken.Generate();

        Assert.True(token.Length >= 32, $"Expected length >= 32 but got {token.Length}");
        Assert.DoesNotContain('+', token);
        Assert.DoesNotContain('/', token);
    }

    /// <summary>Verifies that generate, two calls return different values.</summary>
    [Fact]
    public void Generate_TwoCallsReturnDifferentValues()
    {
        var a = DeploymentFetchToken.Generate();
        var b = DeploymentFetchToken.Generate();

        Assert.NotEqual(a, b);
    }

    /// <summary>Verifies that constant time equals, same token, returns true.</summary>
    [Fact]
    public void ConstantTimeEquals_SameToken_ReturnsTrue()
    {
        var token = DeploymentFetchToken.Generate();

        Assert.True(DeploymentFetchToken.ConstantTimeEquals(token, token));
    }

    /// <summary>Verifies that constant time equals, token with suffix, returns false.</summary>
    [Fact]
    public void ConstantTimeEquals_TokenWithSuffix_ReturnsFalse()
    {
        var token = DeploymentFetchToken.Generate();

        Assert.False(DeploymentFetchToken.ConstantTimeEquals(token, token + "x"));
    }

    /// <summary>Verifies that constant time equals, both empty, returns true.</summary>
    [Fact]
    public void ConstantTimeEquals_BothEmpty_ReturnsTrue()
    {
        Assert.True(DeploymentFetchToken.ConstantTimeEquals("", ""));
    }
}