using System.Text.Json;
using Shouldly;
using Xunit;
using ZB.MOM.WW.OtOpcUa.Host.Configuration;

namespace ZB.MOM.WW.OtOpcUa.Host.Tests.Configuration;

/// <summary>
///     #678.6 — the per-role appsettings overlay name is built from plain roles only. A <c>cluster-*</c> role in the
///     name produced a file that never exists, so no overlay ever loaded on a node with a cluster role.
/// </summary>
public sealed class RoleOverlayTests
{
    [Fact]
    public void A_driver_site_node_loads_the_driver_overlay()
        => RoleOverlay.Suffix(["driver", "cluster-SITE-A"]).ShouldBe("driver");

    [Fact]
    public void A_central_node_loads_the_admin_driver_overlay()
        => RoleOverlay.Suffix(["admin", "driver", "cluster-MAIN"]).ShouldBe("admin-driver");

    [Fact]
    public void Plain_roles_are_ordinal_sorted_regardless_of_input_order()
        => RoleOverlay.Suffix(["driver", "cluster-MAIN", "admin"]).ShouldBe("admin-driver");

    [Fact]
    public void Roles_without_a_cluster_role_keep_the_existing_names()
    {
        RoleOverlay.Suffix(["admin"]).ShouldBe("admin");
        RoleOverlay.Suffix(["driver"]).ShouldBe("driver");
        RoleOverlay.Suffix(["admin", "driver"]).ShouldBe("admin-driver");
    }

    [Fact]
    public void A_cluster_role_prefix_is_matched_case_insensitively()
        => RoleOverlay.Suffix(["driver", "CLUSTER-SITE-A"]).ShouldBe("driver");

    [Fact]
    public void No_plain_role_means_no_overlay()
    {
        RoleOverlay.Suffix([]).ShouldBeNull();
        RoleOverlay.Suffix(["cluster-SITE-A"]).ShouldBeNull();
    }

    // ---- The shipped overlays: activating them on cluster-role nodes must not change production semantics. ----

    private static string HostDir()
    {
        for (var dir = new DirectoryInfo(AppContext.BaseDirectory); dir is not null; dir = dir.Parent)
        {
            var candidate = Path.Combine(dir.FullName, "src", "Server", "ZB.MOM.WW.OtOpcUa.Host");
            if (File.Exists(Path.Combine(candidate, "appsettings.json"))) return candidate;
        }

        throw new InvalidOperationException("Host project directory not found above " + AppContext.BaseDirectory);
    }

    [Theory]
    [InlineData("admin")]
    [InlineData("driver")]
    [InlineData("admin-driver")]
    public void Shipped_overlays_carry_only_the_audited_keys(string suffix)
    {
        using var doc = JsonDocument.Parse(File.ReadAllText(Path.Combine(HostDir(), $"appsettings.{suffix}.json")));
        var root = doc.RootElement;

        // Only Serilog + Security:Ldap, and in Security:Ldap only the two audited keys.
        root.EnumerateObject().Select(p => p.Name).Order().ShouldBe(["Security", "Serilog"]);
        var ldap = root.GetProperty("Security").GetProperty("Ldap");
        ldap.EnumerateObject().Select(p => p.Name).Order().ShouldBe(["DevStubMode", "Transport"]);
        ldap.GetProperty("DevStubMode").GetBoolean().ShouldBeFalse();

        // No Debug-level (or lower) category override: activating an overlay must not raise log volume on a node.
        foreach (var o in root.GetProperty("Serilog").GetProperty("MinimumLevel").GetProperty("Override").EnumerateObject())
            o.Value.GetString().ShouldNotBeOneOf("Debug", "Verbose");
        root.GetProperty("Serilog").GetProperty("MinimumLevel").GetProperty("Default").GetString().ShouldBe("Information");
    }
}