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

namespace HSchool.Simulation.Tests;

public class HealthConditionSystemTests
{
    private static readonly DateTime TuesdayLesson = new(2012, 4, 3, 8, 30, 0, DateTimeKind.Utc);

    [Fact]
    public void SameSeed_SchoolTick_YieldsSameSeverity()
    {
        using var first = OpenStaffed();
        using var second = OpenStaffed();
        var pupilId = first.Roster!.People.First(person => person.IsStudent && !person.IsParent).Id;
        HangArtificial(first, pupilId, severity: 0.25f);
        HangArtificial(second, pupilId, severity: 0.25f);

        TickMinutes(first, 60);
        TickMinutes(second, 60);

        var a = first.Roster.People.First(person => person.Id == pupilId).Conditions![0].Severity;
        var b = second.Roster!.People.First(person => person.Id == pupilId).Conditions![0].Severity;
        Assert.Equal(a, b);
        Assert.True(a > 0.25f);
    }

    [Fact]
    public void Hunger_StillDecaysWhileConditionTicks()
    {
        using var school = OpenStaffed();
        AdvanceTo(school, TuesdayLesson);
        var onCampus = school.CapturePresence().First(row => row.NodeId is not null);
        var pupil = school.Roster!.People.First(person => person.Id.Equals(onCampus.PersonId, StringComparison.Ordinal));
        HangArtificial(school, pupil.Id, severity: 0.2f);

        var hungerBefore = ReadHunger(school, pupil.Id);
        var severityBefore = pupil.Conditions![0].Severity;

        TickMinutes(school, 60);

        var hungerAfter = ReadHunger(school, pupil.Id);
        var severityAfter = pupil.Conditions[0].Severity;
        var catalogHunger = school.Catalog!.Needs["Hunger"];
        Assert.True(hungerAfter < hungerBefore);
        Assert.Equal(hungerBefore - catalogHunger.DecayPerHour, hungerAfter, precision: 3);
        Assert.True(severityAfter > severityBefore);
    }

    private static void HangArtificial(School school, string personId, float severity)
    {
        var person = school.Roster!.People.First(row => row.Id.Equals(personId, StringComparison.Ordinal));
        HealthConditions.Add(
            person,
            new HealthCondition
            {
                DefName = "TestCold",
                Severity = severity,
                Progress = 0f,
                Source = "dev",
                StartedAt = school.Clock.Time,
                SeverityPerDay = 0.5f,
                ProgressPerDay = 0.1f,
            });
    }

    private static float ReadHunger(School school, string personId)
    {
        var value = float.NaN;
        var query = new QueryDescription().WithAll<PersonIdentity, PersonNeeds>();
        school.World.Query(
            in query,
            (ref PersonIdentity identity, ref PersonNeeds needs) =>
            {
                if (identity.Id.Equals(personId, StringComparison.Ordinal))
                {
                    value = needs.Values["Hunger"];
                }
            });
        Assert.False(float.IsNaN(value));
        return value;
    }

    private static void TickMinutes(School school, int minutes)
    {
        for (var i = 0; i < minutes; i++)
        {
            school.Tick(0.2d, 5d);
        }
    }

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

    private static School OpenStaffed()
    {
        var start = new DateTime(2012, 4, 3, 6, 0, 0, DateTimeKind.Utc);
        var (catalog, map) = Vanilla();
        var roster = RosterGenerator.Generate(catalog, map, schoolSeed: 1, "Russia", start);
        var pool = ApplicantPool.Create(catalog, roster, schoolSeed: 1, "Russia", start);
        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, "Здоровье", start, catalog, map);
        school.InstallPeople(roster, seed: 1, "Russia", pool);
        school.SetTimetable(new Timetable(
            [
                new LessonPlacement(schoolClass.Id, "Mathematics", "t1", schoolClass.RoomId, Day: 1, Period: 1),
                new LessonPlacement(schoolClass.Id, "PhysicalEducation", "t2", "gym-hall", Day: 1, Period: 2),
            ],
            []));
        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);
    }
}