using System;
using System.Collections.Generic;
using System.Linq;

namespace PKHeX.Core;

/// <summary>
/// Logic for generating a large amount of <see cref="PKM"/> data.
/// </summary>
public static class BulkGenerator
{
    public static List<PKM> GetLivingDex(this SaveFile sav)
    {
        var speciesToGenerate = Enumerable.Range(1, sav.MaxSpeciesID);
        return GetLivingDex(sav, speciesToGenerate);
    }

    private static List<PKM> GetLivingDex(SaveFile sav, IEnumerable<int> speciesToGenerate)
    {
        return sav.GetLivingDex(speciesToGenerate, sav.BlankPKM);
    }

    public static List<PKM> GetLivingDex(this ITrainerInfo tr, IEnumerable<int> speciesToGenerate, PKM blank)
    {
        var result = new List<PKM>();
        var destType = blank.GetType();
        foreach (var s in speciesToGenerate)
        {
            var pk = blank.Clone();
            pk.Species = s;
            pk.Gender = pk.GetSaneGender();

            var pi = pk.PersonalInfo;
            for (int f = 0; f < pi.FormCount; f++)
            {
                var entry = tr.GetLivingEntry(pk, s, f, destType);
                if (entry == null)
                    continue;
                result.Add(entry);
            }
        }

        return result;
    }

    public static PKM? GetLivingEntry(this ITrainerInfo tr, PKM template, int species, int form, Type destType)
    {
        template.Species = species;
        template.Form = form;
        template.Gender = template.GetSaneGender();

        var f = EncounterMovesetGenerator.GeneratePKMs(template, tr).FirstOrDefault();
        if (f == null)
            return null;

        var result = EntityConverter.ConvertToType(f, destType, out _);
        if (result == null)
            return null;

        result.Species = species;
        result.Form = form;
        result.CurrentLevel = 100;

        result.Heal();
        return result;
    }
}