using Arch.Core;
using HSchool.Ai;
using HSchool.Content;
using HSchool.People;
using HSchool.Schedule;

namespace HSchool.Simulation.Tests;

public class DiseaseSimulationTests
{
    private static readonly DateTime TuesdayMorning = new(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
    private static readonly DateTime LessonStart = new(2012, 4, 3, 8, 30, 0, DateTimeKind.Utc);

    [Fact]
    public void ColdWeather_RaisesRespiratoryOnsetVsWarmControl()
    {
        using var coldSchool = OpenStaffed();
        using var warmSchool = OpenStaffed();
        coldSchool.ForceWeather(new OutdoorWeather(-10f, Precipitation.Snow));
        warmSchool.ForceWeather(new OutdoorWeather(18f, Precipitation.None));

        var coldHits = CountRespiratoryOnset(coldSchool);
        var warmHits = CountRespiratoryOnset(warmSchool);

        Assert.True(coldHits > warmHits);
        Assert.True(coldHits > 0);
    }

    [Fact]
    public void HeavyInfluenza_MarksAbsenceAsIllness()
    {
        var (school, _, pupilId, _) = StaffedMath();
        using (school)
        {
            var pupil = school.Roster!.People.First(row => row.Id == pupilId);
            HealthConditions.Add(
                pupil,
                new HealthCondition
                {
                    DefName = "Influenza",
                    Severity = 0.85f,
                    Progress = 0.1f,
                    Source = "cold",
                    StartedAt = LessonStart.AddDays(-3),
                });

            Assert.True(DiseaseEffects.StayHomeChance(pupil, school.Catalog!, LessonStart) >= 0.5f);

            school.PlanDay = null;
            AdvanceTo(school, LessonStart.AddMinutes(-1));
            SetPlace(school, pupilId, null);
            school.Clock.JumpTo(LessonStart);
            AttendanceSystem.Apply(school);
            school.Clock.JumpTo(LessonStart.AddMinutes(45));
            AttendanceSystem.Apply(school);

            var row = school.Roster.People.First(p => p.Id == pupilId).Attendance?.LastOrDefault();
            Assert.NotNull(row);
            Assert.Equal(AttendanceStatuses.Absent, row!.Status);
            Assert.Equal(AbsenceReasons.Illness, row.AbsenceReason);
            Assert.NotEqual(AbsenceReasons.Truancy, row.AbsenceReason);
        }
    }

    private static int CountRespiratoryOnset(School school)
    {
        // Force the day-onset pass with fixed weather.
        school.LastDiseaseDay = int.MinValue;
        DiseaseSystem.Apply(school, gameMinutes: 0);
        return school.Roster!.People.Count(person =>
            person.Conditions is not null
            && person.Conditions.Any(row =>
                row.DefName is "CommonCold" or "Influenza" or "Otitis"));
    }

    private static void SetPlace(School school, string personId, string? nodeId)
    {
        var query = new QueryDescription().WithAll<PersonIdentity, Presence>();
        school.World.Query(
            in query,
            (ref PersonIdentity identity, ref Presence presence) =>
            {
                if (!identity.Id.Equals(personId, StringComparison.Ordinal))
                {
                    return;
                }

                presence = nodeId is null
                    ? Presence.OffCampus
                    : new Presence(nodeId, 0f, nodeId, false, []);
            });
    }

    private static void AdvanceTo(School school, DateTime until)
    {
        while (school.Clock.Time < until)
        {
            school.Tick(0.2d, 5d);
        }
    }

    private static (School School, string Room, string PupilId, string TeacherId) StaffedMath()
    {
        var (catalog, map) = Vanilla();
        var roster = RosterGenerator.Generate(catalog, map, schoolSeed: 1, "Russia", TuesdayMorning);
        var pool = ApplicantPool.Create(catalog, roster, schoolSeed: 1, "Russia", TuesdayMorning);
        var hired = Staffing.Hire(catalog, map, roster, pool, pool.Applicants[0].Person.Id, Staffing.TeacherPosition, 1_000_000f);
        Assert.Equal(StaffingError.None, hired.Error);
        roster = hired.Roster;
        pool = hired.Pool;
        var hiredId = roster.People.First(person => person.IsStaff).Id;
        var schoolClass = roster.Classes.First(row =>
            row.RoomId is "classroom-101" or "classroom-102" or "classroom-103" or "classroom-104");
        var school = School.Create(1, "Болезни", TuesdayMorning, catalog, map);
        school.InstallPeople(roster, seed: 1, "Russia", pool);
        school.SetTimetable(new Timetable(
            [new LessonPlacement(schoolClass.Id, "Mathematics", hiredId, schoolClass.RoomId, Day: 1, Period: 1)],
            []));
        school.ConfigurePresence(weekDays: 5, maxDecisionsPerTick: 10_000);
        var pupil = schoolClass.PupilIds
            .Select(id => school.Roster!.People.First(person => person.Id == id))
            .First(person => !person.Traits.Contains("Lazy"));
        return (school, schoolClass.RoomId, pupil.Id, hiredId);
    }

    private static School OpenStaffed()
    {
        var start = TuesdayMorning;
        var (catalog, map) = Vanilla();
        var roster = RosterGenerator.Generate(catalog, map, schoolSeed: 42, "Russia", start);
        var pool = ApplicantPool.Create(catalog, roster, schoolSeed: 42, "Russia", start);
        var school = School.Create(1, "Болезни", start, catalog, map);
        school.InstallPeople(roster, seed: 42, "Russia", pool);
        school.ConfigurePresence(weekDays: 5, maxDecisionsPerTick: 10_000);
        return school;
    }

    private static (DefCatalog Catalog, MapLayout Map) Vanilla()
    {
        var root = Path.Combine(AppContext.BaseDirectory, "vanilla");
        var documents = new List<ContentDocument>();
        foreach (var path in Directory.EnumerateFiles(root, "*.*", SearchOption.AllDirectories))
        {
            if (!path.EndsWith(".jsonc", StringComparison.OrdinalIgnoreCase)
                && !path.EndsWith(".json", StringComparison.OrdinalIgnoreCase))
            {
                continue;
            }

            var relative = Path.GetRelativePath(root, path).Replace('\\', '/');
            documents.Add(new ContentDocument(CatalogLoader.CorePackId, relative, File.ReadAllText(path)));
        }

        var catalog = new CatalogLoader().Load([CatalogLoader.CorePackId], documents);
        var map = CatalogLoader.LastDefaultMap([CatalogLoader.CorePackId], documents);
        Assert.NotNull(map);
        return (catalog, map);
    }
}