using FluentAssertions;
using Workflow.Application.Form.Derivation;
using Workflow.Application.Form.Relation;
using Xunit;

namespace BuildFlow.Workflow.Tests.Form;

public class FormRelationFieldTests
{
    [Fact]
    public async Task DeriveAsync_RelationField_ResolvesSnapshot()
    {
        var service = new FormValueDerivationService([new SupplierResolver()], []);

        var result = await service.DeriveAsync(
            RelationSchema,
            """{"supplier":{"id":"supplier-1"},"supplierContact":"旧联系人"}""",
            new FormDerivationContext(null, Guid.NewGuid(), null),
            CancellationToken.None);

        result.DataJson.Should().Contain("\"label\":\"华东供应商\"");
        result.DataJson.Should().Contain("\"code\":\"SUP-001\"");
        result.DataJson.Should().NotContain("supplierContact");
    }

    [Fact]
    public async Task DeriveAsync_RelationField_ThrowsWhenResolverMissing()
    {
        var service = new FormValueDerivationService([], []);

        var act = () => service.DeriveAsync(
            RelationSchema,
            """{"supplier":{"id":"supplier-1"}}""",
            new FormDerivationContext(null, Guid.NewGuid(), null),
            CancellationToken.None);

        await act.Should().ThrowAsync<BusinessException>()
            .WithMessage("*关联源*supplier*未注册*");
    }

    private sealed class SupplierResolver : IFormRelationResolver
    {
        public string SourceCode => "supplier";

        public Task<FormRelationResolveResult> ResolveAsync(
            FormRelationResolveRequest request,
            CancellationToken ct)
        {
            request.Id.Should().Be("supplier-1");
            return Task.FromResult(new FormRelationResolveResult(
                "supplier-1",
                "华东供应商",
                new Dictionary<string, object?>
                {
                    ["code"] = "SUP-001",
                    ["name"] = "华东供应商",
                }));
        }
    }

    private const string RelationSchema = """
    {
      "type": "object",
      "properties": {
        "supplier": {
          "type": "object",
          "title": "供应商",
          "x-component": "RelationPicker",
          "x-field-kind": "relation",
          "x-relation": {
            "sourceType": "endpoint",
            "sourceCode": "supplier",
            "requestUrl": "/api/master-data/suppliers",
            "idField": "id",
            "labelField": "name",
            "snapshotFields": ["code", "name"],
            "onChange": { "clearFields": ["supplierContact"] },
            "updatePolicy": "snapshotOnly"
          }
        },
        "supplierContact": {
          "type": "string",
          "title": "供应商联系人",
          "x-component": "Input"
        }
      }
    }
    """;
}