using HSchool.Content;

namespace HSchool.People.Tests;

public class AttendanceMemoryTests
{
    [Fact]
    public void OverCeiling_DropsTheOldest()
    {
        var person = Blank("a");
        var rules = Rules(max: 2);
        var t0 = new DateTime(2012, 4, 3, 10, 0, 0, DateTimeKind.Utc);
        Assert.True(AttendanceMemory.Record(person, "Mathematics", AttendanceStatuses.Present, t0, 1, rules));
        Assert.True(AttendanceMemory.Record(person, "Literature", AttendanceStatuses.Late, t0.AddMinutes(1), 2, rules));
        Assert.True(AttendanceMemory.Record(person, "History", AttendanceStatuses.Absent, t0.AddMinutes(2), 3, rules, AbsenceReasons.Truancy));

        Assert.Equal(2, person.Attendance!.Count);
        Assert.Equal("Literature", person.Attendance[0].Subject);
        Assert.Equal("History", person.Attendance[1].Subject);
        Assert.Equal(AbsenceReasons.Truancy, person.Attendance[1].AbsenceReason);
    }

    [Fact]
    public void AbsentUpgradesToPresent_SameSlot()
    {
        var person = Blank("a");
        var rules = Rules(max: 40);
        var t0 = new DateTime(2012, 4, 3, 8, 30, 0, DateTimeKind.Utc);
        Assert.True(AttendanceMemory.Record(person, "Mathematics", AttendanceStatuses.Absent, t0, 1, rules));
        Assert.True(AttendanceMemory.Record(person, "Mathematics", AttendanceStatuses.Present, t0.AddMinutes(2), 1, rules));
        Assert.Single(person.Attendance!);
        Assert.Equal(AttendanceStatuses.Present, person.Attendance![0].Status);
        Assert.Null(person.Attendance[0].AbsenceReason);
    }

    [Fact]
    public void RosterJson_RoundTripsAttendance_AndOmitsEmpty()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var pupil = roster.People.First(person => person.IsStudent && !person.IsParent);
        var time = new DateTime(2012, 4, 3, 11, 20, 0, DateTimeKind.Utc);
        AttendanceMemory.Record(pupil, "Mathematics", AttendanceStatuses.Late, time, period: 1, Rules(max: 40));

        var json = RosterJson.Serialize(RosterDocument.From(1, roster));
        Assert.Contains("\"attendance\"", json, StringComparison.Ordinal);
        Assert.Contains("\"status\": \"late\"", json, StringComparison.Ordinal);
        Assert.Contains("\"subject\": \"Mathematics\"", json, StringComparison.Ordinal);

        var without = roster.People.First(person => person.Attendance is null || person.Attendance.Count == 0);
        var withoutSlice = PersonJsonSlice(json, without.Id);
        Assert.DoesNotContain("\"attendance\"", withoutSlice, StringComparison.Ordinal);

        var loaded = RosterJson.Parse(json).ToRoster();
        var loadedPupil = loaded.People.First(person => person.Id.Equals(pupil.Id, StringComparison.Ordinal));
        Assert.NotNull(loadedPupil.Attendance);
        Assert.Single(loadedPupil.Attendance!);
        Assert.Equal(AttendanceStatuses.Late, loadedPupil.Attendance[0].Status);
        Assert.Equal("Mathematics", loadedPupil.Attendance[0].Subject);
        Assert.Equal(1, loadedPupil.Attendance[0].Period);
        Assert.Equal(time, loadedPupil.Attendance[0].Time);
        Assert.Null(loadedPupil.Attendance[0].AbsenceReason);
    }

    [Fact]
    public void RosterJson_RoundTripsAbsentReason()
    {
        var roster = Fixtures.Generate(Fixtures.Classrooms(4));
        var pupil = roster.People.First(person => person.IsStudent && !person.IsParent);
        var time = new DateTime(2012, 4, 3, 11, 20, 0, DateTimeKind.Utc);
        AttendanceMemory.Record(
            pupil,
            "Mathematics",
            AttendanceStatuses.Absent,
            time,
            period: 1,
            Rules(max: 40),
            AbsenceReasons.Truancy);

        var loaded = RosterJson.Parse(RosterJson.Serialize(RosterDocument.From(1, roster))).ToRoster();
        var loadedPupil = loaded.People.First(person => person.Id.Equals(pupil.Id, StringComparison.Ordinal));
        Assert.Equal(AttendanceStatuses.Absent, loadedPupil.Attendance![0].Status);
        Assert.Equal(AbsenceReasons.Truancy, loadedPupil.Attendance[0].AbsenceReason);
    }

    private static string PersonJsonSlice(string json, string personId)
    {
        var marker = $"\"id\": \"{personId}\"";
        var start = json.IndexOf(marker, StringComparison.Ordinal);
        Assert.True(start >= 0);
        var end = json.IndexOf("},", start, StringComparison.Ordinal);
        if (end < 0)
        {
            end = json.Length;
        }

        return json[start..end];
    }

    private static BehaviorDef Rules(int max) => new()
    {
        DefName = "Behavior",
        AttendanceMax = max,
        LessonLateMinutes = 5f,
        LessonMarkWhenLate = true,
    };

    private static Person Blank(string id)
    {
        var cases = new CaseTable
        {
            Nom = id,
            Gen = id,
            Dat = id,
            Acc = id,
            Ins = id,
            Pre = id,
        };
        return new Person
        {
            Id = id,
            FamilyId = "f",
            Female = false,
            BirthDate = new DateTime(2000, 1, 1, 0, 0, 0, DateTimeKind.Utc),
            Name = new PersonName(id, id, id, cases, cases, cases),
            IsStudent = true,
            IsStaff = false,
            IsParent = false,
            Numbers = new Dictionary<string, int>(StringComparer.Ordinal),
            Choices = new Dictionary<string, string>(StringComparer.Ordinal),
            Skills = new Dictionary<string, int>(StringComparer.Ordinal),
            Traits = [],
            Needs = new Dictionary<string, float>(StringComparer.Ordinal),
            Opinions = new Dictionary<string, int>(StringComparer.Ordinal),
        };
    }
}