using Shouldly;
using Xunit;

namespace ZB.MOM.WW.OtOpcUa.Cluster.Tests;

public sealed class RoleParserTests
{
    /// <summary>Verifies that empty input yields an empty array.</summary>
    /// <param name="raw">The raw input string to test (null, empty, or whitespace).</param>
    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void Empty_input_yields_empty_array(string? raw)
    {
        RoleParser.Parse(raw).ShouldBeEmpty();
    }

    /// <summary>Verifies that a single role 'admin' is parsed correctly.</summary>
    [Fact]
    public void Single_role_admin()
    {
        RoleParser.Parse("admin").ShouldBe(new[] { "admin" });
    }

    /// <summary>Verifies that two roles separated by comma are parsed correctly.</summary>
    [Fact]
    public void Two_roles_csv()
    {
        RoleParser.Parse("admin,driver").ShouldBe(new[] { "admin", "driver" });
    }

    /// <summary>Verifies that parser tolerates surrounding whitespace.</summary>
    [Fact]
    public void Whitespace_tolerant()
    {
        RoleParser.Parse(" admin , driver ").ShouldBe(new[] { "admin", "driver" });
    }

    /// <summary>Verifies that parser is case-insensitive and normalizes to lowercase.</summary>
    [Fact]
    public void Case_insensitive_normalizes_to_lower()
    {
        RoleParser.Parse("ADMIN,Driver").ShouldBe(new[] { "admin", "driver" });
    }

    /// <summary>Verifies that duplicate roles are removed.</summary>
    [Fact]
    public void Duplicate_roles_deduped()
    {
        RoleParser.Parse("admin,admin,driver").ShouldBe(new[] { "admin", "driver" });
    }

    /// <summary>Verifies that parser throws for unknown roles.</summary>
    [Fact]
    public void Unknown_role_throws()
    {
        Should.Throw<ArgumentException>(() => RoleParser.Parse("admin,master"));
    }

    /// <summary>Verifies that a single cluster-scoped role is accepted.</summary>
    [Theory]
    [InlineData("cluster-MAIN")]
    [InlineData("cluster-SITE-A")]
    public void Cluster_role_accepted(string role)
    {
        RoleParser.Parse(role).ShouldBe(new[] { role.ToLowerInvariant() });
    }

    /// <summary>Verifies that cluster roles mix freely with the fixed roles.</summary>
    [Fact]
    public void Fixed_and_cluster_roles_mix()
    {
        RoleParser.Parse("driver,cluster-SITE-A").ShouldBe(new[] { "driver", "cluster-site-a" });
    }

    /// <summary>Verifies that a cluster role with an empty ClusterId ("cluster-") is rejected.</summary>
    [Fact]
    public void Empty_cluster_id_throws()
    {
        Should.Throw<ArgumentException>(() => RoleParser.Parse("cluster-"));
    }

    /// <summary>Verifies IsClusterRole returns true for valid cluster roles and false otherwise.</summary>
    [Theory]
    [InlineData("cluster-MAIN", true)]
    [InlineData("cluster-SITE-A", true)]
    [InlineData("cluster-", false)]
    [InlineData("driver", false)]
    [InlineData("admin", false)]
    [InlineData("clusterx", false)]
    public void IsClusterRole_classifies_correctly(string role, bool expected)
    {
        RoleParser.IsClusterRole(role).ShouldBe(expected);
    }

    /// <summary>Verifies ClusterIdFromRole extracts the ClusterId suffix.</summary>
    [Fact]
    public void ClusterIdFromRole_extracts_suffix()
    {
        RoleParser.ClusterIdFromRole("cluster-SITE-A").ShouldBe("SITE-A");
    }

    /// <summary>Verifies the three well-known role constants match the historical literal values.</summary>
    [Fact]
    public void Well_known_role_constants()
    {
        RoleParser.Admin.ShouldBe("admin");
        RoleParser.Driver.ShouldBe("driver");
        RoleParser.Dev.ShouldBe("dev");
        RoleParser.ClusterRolePrefix.ShouldBe("cluster-");
    }
}
