using ZB.MOM.WW.ScadaBridge.CentralUI.Services;

namespace ZB.MOM.WW.ScadaBridge.CentralUI.Tests.Services;

/// <summary>
/// Pins the pure logic behind the Create Instance page's Connection Bindings card
/// (design 2026-08-21): Prefill from a root object, Object inference from a browser
/// pick, and the binding list sent with Create.
/// </summary>
public class CreateBindingPlannerTests
{
    private static IReadOnlyList<BindingGroup> Groups() => BindingGroupBuilder.Build(
    [
        new BindingRow("Running", "Running", null, null),                       // (instance)
        new BindingRow("Left.MoveInFlag", "MoveInFlag", null, null),             // bare default → suggest
        new BindingRow("Left.MoveOutFlag", "MoveOutFlag", null, null),
        new BindingRow("Recv.Count", "MESReceiver_023.Count", null, null),       // prefixed default → from template
        new BindingRow("Recv.State", "MESReceiver_023.State", null, null),
    ]);

    /// <summary>Verifies that prefill fills blank objects only.</summary>
    [Fact]
    public void Prefill_fills_blank_objects_only()
    {
        var inputs = new Dictionary<string, CreateBindingPlanner.GroupInput>
        {
            ["Left"] = new(0, "Typed_Left"),
        };
        var result = CreateBindingPlanner.Prefill(Groups(), inputs, connectionId: 7, rootObject: "Z28063");

        Assert.Equal(new CreateBindingPlanner.GroupInput(7, "Z28063"), result[BindingGroupBuilder.InstanceGroupKey]);
        Assert.Equal(new CreateBindingPlanner.GroupInput(7, "Typed_Left"), result["Left"]);          // typed wins
        Assert.Equal(new CreateBindingPlanner.GroupInput(7, "MESReceiver_023"), result["Recv"]);     // from template
        Assert.Equal(CreateBindingPlanner.ObjectSource.Typed, CreateBindingPlanner.SourceOf(Groups()[1], result["Left"]));
        Assert.Equal(CreateBindingPlanner.ObjectSource.FromTemplate, CreateBindingPlanner.SourceOf(Groups()[2], result["Recv"]));
    }

    /// <summary>Verifies that prefill suggests root dot module for bare defaults.</summary>
    [Fact]
    public void Prefill_suggests_root_dot_module_for_bare_defaults()
    {
        var result = CreateBindingPlanner.Prefill(Groups(), new Dictionary<string, CreateBindingPlanner.GroupInput>(), 7, "Z28063");
        Assert.Equal("Z28063.Left", result["Left"].Object);
        Assert.Equal(CreateBindingPlanner.ObjectSource.Suggested, CreateBindingPlanner.SourceOf(Groups()[1], result["Left"]));
    }

    /// <summary>Verifies that prefill with blank root sets connection only.</summary>
    [Fact]
    public void Prefill_with_blank_root_sets_connection_only()
    {
        var result = CreateBindingPlanner.Prefill(Groups(), new Dictionary<string, CreateBindingPlanner.GroupInput>(), 7, "");
        Assert.Equal(new CreateBindingPlanner.GroupInput(7, null), result[BindingGroupBuilder.InstanceGroupKey]);
        Assert.Equal(new CreateBindingPlanner.GroupInput(7, null), result["Left"]);
        Assert.Equal(new CreateBindingPlanner.GroupInput(7, "MESReceiver_023"), result["Recv"]);
    }

    /// <summary>Verifies that object from pick strips member tail.</summary>
    /// <param name="picked">The picked value for the case.</param>
    /// <param name="expected">The expected value for the case.</param>
    [Theory]
    [InlineData("Z28063.Left.MoveInFlag", "Z28063.Left")]   // leaf under the group → strip tail
    [InlineData("Z28063.Left", "Z28063.Left")]              // object node → as-is
    [InlineData("ns=2;s=Plant.Left.MoveOutFlag", "ns=2;s=Plant.Left")]
    [InlineData("Other.Thing", "Other.Thing")]              // no member tail matches → as-is
    public void ObjectFromPick_strips_member_tail(string picked, string expected)
        => Assert.Equal(expected, CreateBindingPlanner.ObjectFromPick(Groups()[1], picked));

    /// <summary>Verifies that build bindings skips groups without connection or object.</summary>
    [Fact]
    public void BuildBindings_skips_groups_without_connection_or_object()
    {
        var inputs = new Dictionary<string, CreateBindingPlanner.GroupInput>
        {
            [BindingGroupBuilder.InstanceGroupKey] = new(7, "Z28063"),
            ["Left"] = new(7, null),              // connection, no object → skipped (stays unbound)
            ["Recv"] = new(0, "MESReceiver_023"), // object, no connection → skipped
        };
        var bindings = CreateBindingPlanner.BuildBindings(Groups(), inputs);
        var single = Assert.Single(bindings);
        Assert.Equal(("Running", 7, "Z28063.Running"), (single.AttributeName, single.DataConnectionId, single.DataSourceReferenceOverride));
    }

    /// <summary>Verifies that build bindings rewrites every member of a bound group.</summary>
    [Fact]
    public void BuildBindings_rewrites_every_member_of_a_bound_group()
    {
        var inputs = new Dictionary<string, CreateBindingPlanner.GroupInput> { ["Left"] = new(7, "Z28063.Left") };
        var bindings = CreateBindingPlanner.BuildBindings(Groups(), inputs);
        Assert.Equal(2, bindings.Count);
        Assert.Contains(bindings, b => b.AttributeName == "Left.MoveInFlag" && b.DataSourceReferenceOverride == "Z28063.Left.MoveInFlag");
    }
}