using Jiaowu.Api.Domain.Academic;
using Jiaowu.Api.Infrastructure.Grades;

namespace Jiaowu.Api.Tests;

public sealed class GradeCalculatorTests
{
    [Theory]
    [InlineData(30, 0, 70, true)]
    [InlineData(20, 20, 60, true)]
    [InlineData(30, 20, 40, false)]
    [InlineData(-10, 40, 70, false)]
    public void Weights_must_be_non_negative_and_total_one_hundred(
        decimal regular,
        decimal midterm,
        decimal final,
        bool expected)
    {
        Assert.Equal(
            expected,
            GradeCalculator.AreWeightsValid(
                regular,
                final,
                [new GradeItem { Name = "期中成绩", Weight = midterm }]));
    }

    [Fact]
    public void Total_uses_configured_weights_and_one_decimal_rounding()
    {
        var total = GradeCalculator.CalculateTotal(
            83,
            91,
            [],
            30,
            70,
            [],
            GradeExamStatus.Normal);

        Assert.Equal(88.6m, total);
        Assert.Equal(3.7m, GradeCalculator.CalculateGradePoint(total));
    }

    [Fact]
    public void Missing_required_component_keeps_total_unresolved()
    {
        Assert.Null(GradeCalculator.CalculateTotal(
            83,
            null,
            [],
            30,
            70,
            [],
            GradeExamStatus.Normal));
    }

    [Theory]
    [InlineData(GradeExamStatus.Absent)]
    [InlineData(GradeExamStatus.Deferred)]
    [InlineData(GradeExamStatus.Exempt)]
    public void Exceptional_exam_status_has_no_numeric_total(GradeExamStatus status)
    {
        Assert.Null(GradeCalculator.CalculateTotal(90, 90, [], 30, 70, [], status));
    }
}