using Bunit;
using Microsoft.Extensions.DependencyInjection;
using NSubstitute;
using ZB.MOM.WW.ScadaBridge.CentralUI.Components.Shared;
using ZB.MOM.WW.ScadaBridge.CentralUI.Services;

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

/// <summary>
/// M9-T30: <c>ParameterValueForm</c> renders typed nested inputs for object and
/// list parameters (replacing the raw-JSON textarea fallback), driven by the
/// declared schema (with <c>{"$ref":"lib:Name"}</c> resolved via
/// <see cref="ISchemaLibraryQueryService"/>), with per-field validation, and
/// emits the SAME canonical JSON value shape the form has always produced
/// (scalars as bool/long/double/string, objects as
/// <c>Dictionary&lt;string,object?&gt;</c>, lists as <c>List&lt;object?&gt;</c>).
/// </summary>
public class ParameterValueFormTests : BunitContext
{
    private readonly ISchemaLibraryQueryService _library = Substitute.For<ISchemaLibraryQueryService>();

    public ParameterValueFormTests()
    {
        // Default: empty library (no $ref entries). Individual tests override.
        _library.GetSchemaMapAsync(Arg.Any<CancellationToken>())
            .Returns(new Dictionary<string, string>());
        Services.AddSingleton(_library);
    }

    private const string ObjectParamSchema = """
        {
          "type": "object",
          "properties": {
            "order": {
              "type": "object",
              "properties": {
                "id": { "type": "integer" },
                "name": { "type": "string" }
              },
              "required": ["id"]
            }
          },
          "required": ["order"]
        }
        """;

    private const string ListParamSchema = """
        {
          "type": "object",
          "properties": {
            "tags": {
              "type": "array",
              "items": { "type": "string" }
            }
          }
        }
        """;

    [Fact]
    public void ObjectParameter_RendersPerFieldInputs_NotRawTextarea()
    {
        var cut = Render<ParameterValueForm>(p => p
            .Add(x => x.ParameterDefinitions, ObjectParamSchema)
            .Add(x => x.Values, new Dictionary<string, object?>()));

        // No raw-JSON textarea fallback for the object parameter.
        Assert.Empty(cut.FindAll("textarea"));

        // Nested fields are rendered as their own typed inputs: an Integer (number)
        // for order.id and a String (text) for order.name.
        var numberInputs = cut.FindAll("input[type=number]");
        var textInputs = cut.FindAll("input[type=text]");
        Assert.NotEmpty(numberInputs);
        Assert.NotEmpty(textInputs);

        // The nested field labels surface.
        Assert.Contains("id", cut.Markup);
        Assert.Contains("name", cut.Markup);
    }

    [Fact]
    public void ObjectParameter_RoundTripsToCanonicalNestedJsonShape()
    {
        Dictionary<string, object?>? emitted = null;
        var cut = Render<ParameterValueForm>(p => p
            .Add(x => x.ParameterDefinitions, ObjectParamSchema)
            .Add(x => x.Values, new Dictionary<string, object?>())
            .Add(x => x.ValuesChanged, v => emitted = v));

        // Enter the nested integer field (order.id).
        var idInput = cut.FindAll("input[type=number]")[0];
        idInput.Input("42");

        // Enter the nested string field (order.name).
        var nameInput = cut.FindAll("input[type=text]")[0];
        nameInput.Input("widget");

        Assert.NotNull(emitted);
        var order = Assert.IsType<Dictionary<string, object?>>(emitted!["order"]);
        Assert.Equal(42L, order["id"]);
        Assert.Equal("widget", order["name"]);
    }

    [Fact]
    public void ListParameter_RendersAddRemoveTypedItemRows()
    {
        Dictionary<string, object?>? emitted = null;
        var cut = Render<ParameterValueForm>(p => p
            .Add(x => x.ParameterDefinitions, ListParamSchema)
            .Add(x => x.Values, new Dictionary<string, object?>())
            .Add(x => x.ValuesChanged, v => emitted = v));

        // No raw-JSON textarea fallback for the list parameter.
        Assert.Empty(cut.FindAll("textarea"));

        // An "add item" button exists; clicking it appends a typed item editor.
        var addButton = cut.Find("button.param-list-add");
        addButton.Click();

        var itemInput = cut.Find("input.param-list-item");
        itemInput.Input("alpha");

        Assert.NotNull(emitted);
        var tags = Assert.IsType<List<object?>>(emitted!["tags"]);
        Assert.Single(tags);
        Assert.Equal("alpha", tags[0]);

        // Removing the row drops it back to an empty list.
        cut.Find("button.param-list-remove").Click();
        var tagsAfter = Assert.IsType<List<object?>>(emitted!["tags"]);
        Assert.Empty(tagsAfter);
    }

    [Fact]
    public void RefBearingParameter_RendersResolvedShape()
    {
        // The library entry "Address" resolves to an object schema with two string
        // fields; the parameter references it via {"$ref":"lib:Address"}.
        const string libSchema = """
            {
              "type": "object",
              "properties": {
                "street": { "type": "string" },
                "city": { "type": "string" }
              }
            }
            """;
        _library.GetSchemaMapAsync(Arg.Any<CancellationToken>())
            .Returns(new Dictionary<string, string> { ["Address"] = libSchema });

        const string paramSchema = """
            {
              "type": "object",
              "properties": {
                "shipTo": { "$ref": "lib:Address" }
              }
            }
            """;

        var cut = Render<ParameterValueForm>(p => p
            .Add(x => x.ParameterDefinitions, paramSchema)
            .Add(x => x.Values, new Dictionary<string, object?>()));

        // The resolved shape renders its fields (no raw textarea, no unresolved-ref message).
        Assert.Empty(cut.FindAll("textarea"));
        Assert.Contains("street", cut.Markup);
        Assert.Contains("city", cut.Markup);
        // Two string inputs for the resolved object's two fields.
        Assert.Equal(2, cut.FindAll("input[type=text]").Count);
    }

    [Fact]
    public void PerFieldValidationError_SurfacesInline()
    {
        // A required nested field (order.id is an integer) left non-numeric must
        // surface a per-field error inline.
        var cut = Render<ParameterValueForm>(p => p
            .Add(x => x.ParameterDefinitions, ObjectParamSchema)
            .Add(x => x.Values, new Dictionary<string, object?>()));

        var idInput = cut.FindAll("input[type=number]")[0];
        idInput.Input("not-a-number");

        // A field-level error class is shown.
        Assert.NotEmpty(cut.FindAll(".text-danger"));
    }
}