namespace HSchool.People.Tests;

public class RosterBrowserTests
{
    [Fact]
    public void FilterByRoleAndYear_KeepsOnlyThosePupils()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var page = RosterBrowser.Apply(
            roster,
            Fixtures.AsOf,
            Query(role: PersonRoles.Student, year: 1, pageSize: RosterBrowser.MaxPageSize));

        Assert.NotEmpty(page.People);
        Assert.Equal(page.People.Count, page.Total);
        Assert.All(page.People, person =>
        {
            Assert.True(person.IsStudent);
            var schoolClass = roster.Classes.Single(candidate => candidate.Id == person.ClassId);
            Assert.Equal(1, schoolClass.Year);
        });
    }

    [Fact]
    public void SortBySurname_IsAscendingOrdinal()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var page = RosterBrowser.Apply(roster, Fixtures.AsOf, Query(pageSize: 20));

        var surnames = page.People.Select(person => person.Name.Surname).ToArray();
        var expected = surnames.OrderBy(name => name, StringComparer.Ordinal).ToArray();
        Assert.Equal(expected, surnames);
    }

    [Fact]
    public void PagePastTheEnd_IsEmptyButKeepsTheTotal()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(2));
        var first = RosterBrowser.Apply(roster, Fixtures.AsOf, Query(page: 1, pageSize: 10));
        var past = RosterBrowser.Apply(roster, Fixtures.AsOf, Query(page: 999, pageSize: 10));

        Assert.True(first.Total > 10);
        Assert.Equal(10, first.People.Count);
        Assert.Equal(first.Total, past.Total);
        Assert.Empty(past.People);
    }

    [Fact]
    public void ParentFilter_IncludesStaffWhoAreAlsoParents()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var page = RosterBrowser.Apply(
            roster,
            Fixtures.AsOf,
            Query(role: PersonRoles.Parent, pageSize: RosterBrowser.MaxPageSize));

        Assert.Contains(page.People, person => person.IsStaff && person.IsParent);
        Assert.All(page.People, person => Assert.True(person.IsParent));
    }

    private static RosterQuery Query(
        string? role = null,
        int? year = null,
        int page = 1,
        int pageSize = RosterBrowser.DefaultPageSize) =>
        new(role, year, Letter: null, Position: null, Female: null, AgeMin: null, AgeMax: null, PersonSort.Surname, Descending: false, page, pageSize);
}