using System.Collections.Generic;
using System.Text;
using PKHeX.Core;

namespace PKHeX.Drawing.PokeSprite;

public static class SpriteName
{
    public static bool AllowShinySprite { get; set; }

    private const char Separator = '_';
    private const char Cosplay = 'c';
    private const char Shiny = 's';
    private const char GGStarter = 'p';

    /// <summary>
    /// Gets the resource name of the <see cref="Ball"/> sprite.
    /// </summary>
    public static string GetResourceStringBall(int ball) => $"_ball{ball}";

    /// <summary>
    /// Gets the resource name of the Pokémon sprite.
    /// </summary>
    public static string GetResourceStringSprite(ushort species, byte form, int gender, uint formarg, EntityContext context = PKX.Context, bool shiny = false)
    {
        if (SpeciesDefaultFormSprite.Contains(species)) // Species who show their default sprite regardless of Form
            form = 0;

        var sb = new StringBuilder(12); // longest expected string result
        sb.Append(Separator).Append(species);

        if (form != 0)
        {
            sb.Append(Separator).Append(form);

            if (species == (int) Species.Pikachu)
            {
                if (context == EntityContext.Gen6)
                {
                    sb.Append(Cosplay);
                    gender = 1; // Cosplay Pikachu gift can only be Female, but personal entries are set to be either Gender
                }
                else if (form == 8)
                {
                    sb.Append(GGStarter);
                }
            }
            else if (species == (int) Species.Eevee)
            {
                if (form == 1)
                    sb.Append(GGStarter);
            }
        }
        if (gender == 1 && SpeciesGenderedSprite.Contains(species))
        {
            sb.Append('f');
        }

        if (species == (int) Species.Alcremie)
        {
            if (form == 0)
                sb.Append(Separator).Append(form);
            sb.Append(Separator).Append(formarg);
        }

        if (shiny && AllowShinySprite)
            sb.Append(Shiny);
        return sb.ToString();
    }

    /// <summary>
    /// Species that show their default Species sprite regardless of current <see cref="PKM.Form"/>
    /// </summary>
    private static readonly HashSet<ushort> SpeciesDefaultFormSprite = new()
    {
        (int)Species.Mothim,
        (int)Species.Scatterbug,
        (int)Species.Spewpa,
        (int)Species.Rockruff,
        (int)Species.Mimikyu,
        (int)Species.Sinistea,
        (int)Species.Polteageist,
        (int)Species.Urshifu,
        (int)Species.Dudunsparce,
        (int)Species.Poltchageist,
        (int)Species.Sinistcha,
    };

    /// <summary>
    /// Species that show a <see cref="PKM.Gender"/> specific Sprite
    /// </summary>
    private static readonly HashSet<ushort> SpeciesGenderedSprite = new()
    {
        (int)Species.Pikachu,
        (int)Species.Hippopotas,
        (int)Species.Hippowdon,
        (int)Species.Unfezant,
        (int)Species.Frillish,
        (int)Species.Jellicent,
        (int)Species.Pyroar,
    };
}