using FluentAssertions;
using ProposalSystem.Application.DTOs;
using ProposalSystem.Application.Validators;
using ProposalSystem.Domain.Entities;
using Xunit;

namespace ProposalSystem.Tests.Validators;

/// <summary>
/// PR5: Tests for UpdatePricingLibraryItemValidator.
/// </summary>
public class UpdatePricingLibraryItemValidatorTests
{
    private readonly UpdatePricingLibraryItemValidator _sut = new();

    [Fact(DisplayName = "PR5: Valid update request passes")]
    public void ValidRequest_Passes()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: "Updated Title",
            Description: "Updated description",
            ServiceCategory: ServiceCategory.Electrical,
            Unit: "hr",
            UnitPrice: 125.50m,
            Keywords: "electrical wiring"
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeTrue();
    }

    [Fact(DisplayName = "PR5: All-null update request passes (no changes)")]
    public void AllNullRequest_Passes()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: null,
            Description: null,
            ServiceCategory: null,
            Unit: null,
            UnitPrice: null,
            Keywords: null
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeTrue();
    }

    [Fact(DisplayName = "PR5: Empty title when provided fails")]
    public void EmptyTitle_Fails()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: "",
            Description: null,
            ServiceCategory: null,
            Unit: null,
            UnitPrice: null,
            Keywords: null
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.PropertyName == "Title");
    }

    [Fact(DisplayName = "PR5: Title exceeding 200 chars fails")]
    public void Title_TooLong_Fails()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: new string('X', 201),
            Description: null,
            ServiceCategory: null,
            Unit: null,
            UnitPrice: null,
            Keywords: null
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.PropertyName == "Title");
    }

    [Fact(DisplayName = "PR5: Negative UnitPrice fails")]
    public void NegativeUnitPrice_Fails()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: null,
            Description: null,
            ServiceCategory: null,
            Unit: null,
            UnitPrice: -5.00m,
            Keywords: null
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.PropertyName == "UnitPrice");
    }

    [Fact(DisplayName = "PR5: Invalid ServiceCategory enum fails")]
    public void InvalidServiceCategory_Fails()
    {
        var request = new UpdatePricingLibraryItemRequest(
            Title: null,
            Description: null,
            ServiceCategory: (ServiceCategory)999,
            Unit: null,
            UnitPrice: null,
            Keywords: null
        );

        var result = _sut.Validate(request);

        result.IsValid.Should().BeFalse();
        result.Errors.Should().Contain(e => e.PropertyName == "ServiceCategory");
    }
}