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

namespace HSchool.Simulation;

/// <summary>Builds apparel goal inputs for the decision planner.</summary>
internal static class ApparelPresence
{
    public static ApparelActor Build(School school, Person person, SchoolClass? schoolClass)
    {
        if (school.Catalog is null || !person.IsStudent && !person.IsStaff)
        {
            return default;
        }

        var mode = ModeAt(school, person, schoolClass);
        var issues = ApparelDresser.CurrentIssues(school, person, mode);
        var kind = ApparelGoals.Classify(issues);
        var room = ChangingRoomNode(school, person);
        return new ApparelActor(person.Female, issues, kind, room);
    }

    public static void EnqueueOnWeatherChange(School school, OutdoorWeather before, OutdoorWeather after)
    {
        if (before.Tenths == after.Tenths && before.Precipitation == after.Precipitation)
        {
            return;
        }

        foreach (var person in school.Roster!.People.OrderBy(row => row.Id, StringComparer.Ordinal))
        {
            school.DecisionQueue.Enqueue(person.Id);
        }
    }

    internal static ApparelMode ModeAt(School school, Person person, SchoolClass? schoolClass)
    {
        if (school.Catalog is null || school.Timetable is null)
        {
            return ApparelMode.Everyday;
        }

        var slot = SchoolDay.At(school.Catalog, school.Clock.Time, school.SchoolWeekDays);
        var day = SchoolDay.WeekdayIndex(school.Clock.Time);
        var lessons = Duty.LessonsToday(person, schoolClass, school.Timetable, day);
        if (lessons.Count == 0)
        {
            return ApparelMode.Everyday;
        }

        if (slot.Kind == DaySlotKind.Lesson)
        {
            var current = lessons.FirstOrDefault(lesson => lesson.Period == slot.Index);
            return ApparelDresser.ModeForLesson(current?.Subject);
        }

        if (slot.Kind == DaySlotKind.Break)
        {
            var justEnded = lessons.FirstOrDefault(lesson => lesson.Period == slot.Index);
            if (justEnded is not null && ApparelDresser.ModeForLesson(justEnded.Subject) == ApparelMode.Pe)
            {
                return ApparelMode.Everyday;
            }

            var next = lessons.Where(lesson => lesson.Period > slot.Index).OrderBy(lesson => lesson.Period).FirstOrDefault();
            if (next is not null)
            {
                return ApparelDresser.ModeForLesson(next.Subject);
            }

            return ApparelMode.Everyday;
        }

        var nextLesson = lessons.Where(lesson => lesson.Period > slot.Index).OrderBy(lesson => lesson.Period).FirstOrDefault();
        if (nextLesson is not null)
        {
            return ApparelDresser.ModeForLesson(nextLesson.Subject);
        }

        var previous = lessons.Where(lesson => lesson.Period < slot.Index).OrderByDescending(lesson => lesson.Period).FirstOrDefault();
        if (previous is not null && ApparelDresser.ModeForLesson(previous.Subject) == ApparelMode.Pe)
        {
            return ApparelMode.Everyday;
        }

        return ApparelMode.Everyday;
    }

    internal static string? ChangingRoomNode(School school, Person person)
    {
        if (person.LockerRoomId is { } assigned)
        {
            return assigned;
        }

        if (school.Map is null || school.Catalog is null)
        {
            return null;
        }

        var want = ApparelDresser.ChangingRoomDef(person.Female);
        if (want is null)
        {
            return null;
        }

        return school.Map.Rooms
            .FirstOrDefault(room => room.Def.Equals(want, StringComparison.Ordinal))
            ?.Id;
    }
}