using Fake.Application;
using FluentAssertions;
using Oms.Application.Shared;
using Oms.Domain.ChannelsAggregate.Entities;

namespace Oms.Tests;

public class WeightRoundingRangeGuardTests
{
    [Fact]
    public void AdjacentLeftOpenRightClosed_ShouldNotOverlap()
    {
        var existing = new[] { Range(1, 0, 30) };

        var act = () => WeightRoundingRangeGuard.EnsureNoOverlap(30, 60, existing);

        act.Should().NotThrow();
    }

    [Fact]
    public void ContainedRange_ShouldOverlap()
    {
        var existing = new[] { Range(1, 0, 30) };

        var act = () => WeightRoundingRangeGuard.EnsureNoOverlap(5, 10, existing);

        act.Should().Throw<BusinessException>().WithMessage("*重叠*");
    }

    [Fact]
    public void CrossingRange_ShouldOverlap()
    {
        var existing = new[] { Range(1, 0, 30) };

        var act = () => WeightRoundingRangeGuard.EnsureNoOverlap(20, 40, existing);

        act.Should().Throw<BusinessException>();
    }

    [Fact]
    public void UpdateSameRow_ShouldIgnoreSelf()
    {
        var existing = new[] { Range(8, 0, 30), Range(9, 30, 60) };

        var act = () => WeightRoundingRangeGuard.EnsureNoOverlap(0, 30, existing, excludeId: 8);

        act.Should().NotThrow();
    }

    [Fact]
    public void StartNotLessThanEnd_ShouldFail()
    {
        var act = () => WeightRoundingRangeGuard.EnsureNoOverlap(30, 30, []);

        act.Should().Throw<BusinessException>().WithMessage("*起始值须小于截止值*");
    }

    [Fact]
    public void HoleBetweenRanges_ShouldFail()
    {
        var existing = new[] { Range(1, 0, 10) };

        var act = () => WeightRoundingRangeGuard.EnsureContiguous(20, 30, existing);

        act.Should().Throw<BusinessException>().WithMessage("*缺口*");
    }

    [Fact]
    public void AdjacentRanges_ShouldBeContiguous()
    {
        var existing = new[] { Range(1, 0, 10) };

        var act = () => WeightRoundingRangeGuard.EnsureContiguous(10, 25, existing);

        act.Should().NotThrow();
    }

    [Fact]
    public void UpdateSameRow_Contiguous_ShouldIgnoreSelf()
    {
        var existing = new[] { Range(8, 0, 30), Range(9, 30, 60) };

        var act = () => WeightRoundingRangeGuard.EnsureContiguous(0, 30, existing, excludeId: 8);

        act.Should().NotThrow();
    }

    private static WeightRoundingInfo Range(int id, decimal start, decimal end) =>
        new()
        {
            Id = id,
            RoundingId = 1,
            StartValue = start,
            EndValue = end,
            Public = "0.5"
        };
}