PKHeX/PKHeX.Core/PKM/ShowdownSet.cs

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

namespace PKHeX.Core
{
    /// <summary>
    /// Logic for exporting and importing <see cref="PKM"/> data in Pokémon Showdown's text format.
    /// </summary>
    public class ShowdownSet
    {
        // String to Values
        private static readonly string[] StatNames = { "HP", "Atk", "Def", "SpA", "SpD", "Spe" };
        private static readonly string[] genders = {"M", "F", ""};
        private static readonly string[] genderForms = {"", "F", ""};
        private const string Language = "en";
        private const int LanguageID = 2;
        private static readonly string[] types = Util.GetTypesList(Language);
        private static readonly string[] forms = Util.GetFormsList(Language);
        private static readonly string[] species = Util.GetSpeciesList(Language);
        private static readonly string[] items = Util.GetItemsList(Language);
        private static readonly string[] g2items = Util.GetStringList("ItemsG2", Language);
        private static readonly string[] g3items = Util.GetStringList("ItemsG3", Language);
        private static readonly string[] natures = Util.GetNaturesList(Language);
        private static readonly string[] moves = Util.GetMovesList(Language);
        private static readonly string[] abilities = Util.GetAbilitiesList(Language);
        private static readonly string[] hptypes = types.Skip(1).ToArray();
        private static int MAX_SPECIES => species.Length-1;

        // Default Set Data
        public string Nickname { get; set; }
        public int Species { get; private set; } = -1;
        public int Format { get; private set; } = PKX.Generation;
        public string Form { get; private set; }
        public string Gender { get; private set; }
        public int HeldItem { get; private set; }
        public int Ability { get; private set; } = -1;
        public int Level { get; private set; } = 100;
        public bool Shiny { get; private set; }
        public int Friendship { get; private set; } = 255;
        public int Nature { get; private set; }
        public int FormIndex { get; private set; }
        public int[] EVs { get; private set; } = {00, 00, 00, 00, 00, 00};
        public int[] IVs { get; private set; } = {31, 31, 31, 31, 31, 31};
        public int[] Moves { get; private set; } = {0, 0, 0, 0};
        public readonly List<string> InvalidLines = new List<string>();

        private int[] IVsSpeedFirst => new[] {IVs[0], IVs[1], IVs[2], IVs[5], IVs[3], IVs[4]};
        private int[] IVsSpeedLast => new[] {IVs[0], IVs[1], IVs[2], IVs[4], IVs[5], IVs[3]};
        private int[] EVsSpeedFirst => new[] {EVs[0], EVs[1], EVs[2], EVs[5], EVs[3], EVs[4]};
        private int[] EVsSpeedLast => new[] {EVs[0], EVs[1], EVs[2], EVs[4], EVs[5], EVs[3]};

        // Parsing Utility
        public ShowdownSet(string input = null)
        {
            if (input == null)
                return;

            string[] lines = input.Split(new[] { "\r\n", "\n" }, StringSplitOptions.None);
            LoadLines(lines);
        }
        public ShowdownSet(IEnumerable<string> lines)
        {
            if (lines == null)
                return;
            LoadLines(lines);
        }
        private void LoadLines(IEnumerable<string> lines)
        {
            lines = lines.Select(z => z.Replace("'", "’").Trim()); // Sanitize apostrophes
            lines = lines.Where(z => z.Length > 2);

            ParseLines(lines);

            // Showdown Quirks
            Form = ConvertFormFromShowdown(Form, Species, Ability);
            // Set Form
            string[] formStrings = PKX.GetFormList(Species, types, forms, genderForms);
            FormIndex = Math.Max(0, Array.FindIndex(formStrings, z => z.Contains(Form ?? "")));
        }
        private void ParseLines(IEnumerable<string> lines)
        {
            int movectr = 0;
            foreach (string line in lines)
            {
                if (line.StartsWith("-"))
                {
                    string moveString = ParseLineMove(line);
                    int move = Array.IndexOf(moves, moveString);
                    if (move < 0)
                        InvalidLines.Add($"Unknown Move: {moveString}");
                    else
                        Moves[movectr++] = move;

                    if (movectr == 4)
                        return; // End of moves, end of set data
                    continue;
                }

                string[] brokenline = line.Split(new[] { ": " }, StringSplitOptions.None);
                if (brokenline.Length == 1)
                    brokenline = new[] {brokenline[0], string.Empty};
                switch (brokenline[0])
                {
                    case "Trait":
                    case "Ability": { Ability = Array.IndexOf(abilities, brokenline[1].Trim()); break; }
                    case "Level": { if (int.TryParse(brokenline[1].Trim(), out int val)) Level = val; else InvalidLines.Add(line); break; }
                    case "Shiny": { Shiny = brokenline[1].Trim() == "Yes"; break; }
                    case "Happiness": { if (int.TryParse(brokenline[1].Trim(), out int val)) Friendship = val; else InvalidLines.Add(line); break; }
                    case "Nature": { Nature = Array.IndexOf(natures, brokenline[1].Trim()); break; }
                    case "EV":
                    case "EVs": { ParseLineEVs(brokenline[1].Trim()); break; }
                    case "IV":
                    case "IVs": { ParseLineIVs(brokenline[1].Trim()); break; }
                    case "Type": { brokenline = new[] {line}; goto default; } // Type: Null edge case
                    default:
                    {
                        // Either Nature or Gender ItemSpecies
                        if (brokenline[0].Contains(" @ "))
                        {
                            string[] pieces = line.Split(new[] {" @ "}, StringSplitOptions.None);
                            string itemstr = pieces.Last().Trim();

                            ParseItemStr(itemstr);
                            ParseFirstLine(pieces[0]);
                        }
                        else if (brokenline[0].Contains("Nature"))
                        {
                            string naturestr = line.Split(' ')[0].Trim();
                            int nature = Array.IndexOf(natures, naturestr);
                            if (nature < 0)
                                InvalidLines.Add($"Unknown Nature: {naturestr}");
                            else
                                Nature = nature;
                        }
                        else // First Line does not contain an item
                        {
                            ParseFirstLine(line.Trim());
                        }
                        break;
                    }
                }
            }
        }

        private void ParseItemStr(string itemstr)
        {
            int item = Array.IndexOf(items, itemstr);
            if (item >= 0)
            {
                HeldItem = item;
                return;
            }
            if ((item = Array.IndexOf(g3items, itemstr)) >= 0)
            {
                HeldItem = item;
                Format = 3;
            }
            if ((item = Array.IndexOf(g2items, itemstr)) >= 0)
            {
                HeldItem = item;
                Format = 2;
            }
            else
                InvalidLines.Add($"Unknown Item: {itemstr}");
        }

        public string Text => GetText();
        private string GetText()
        {
            if (Species == 0 || Species > MAX_SPECIES)
                return string.Empty;

            var result = new List<string>();

            // First Line: Name, Nickname, Gender, Item
            string form = ConvertFormToShowdown(Form, Species);
            result.Add(GetStringFirstLine(form));

            // IVs
            if (GetStringStats(out IEnumerable<string> ivstr, IVsSpeedLast, 31))
                result.Add($"IVs: {string.Join(" / ", ivstr)}");

            // EVs
            if (GetStringStats(out IEnumerable<string> evstr, EVsSpeedLast, 0))
                result.Add($"EVs: {string.Join(" / ", evstr)}");

            // Secondary Stats
            if (Ability > -1 && Ability < abilities.Length)
                result.Add($"Ability: {abilities[Ability]}");
            result.Add($"Level: {Level}");
            if (Shiny)
                result.Add("Shiny: Yes");

            if (Nature > -1)
                result.Add($"{natures[Nature]} Nature");

            // Moves
            result.AddRange(GetStringMoves());

            return string.Join(Environment.NewLine, result);
        }
        private string GetStringFirstLine(string form)
        {
            string specForm = species[Species];
            if (!string.IsNullOrWhiteSpace(form))
                specForm += $"-{form.Replace("Mega ", "Mega-")}";

            string result = Nickname != null && PKX.GetSpeciesNameGeneration(Species, LanguageID, Format) != Nickname ? $"{Nickname} ({specForm})" : $"{specForm}";
            if (!string.IsNullOrEmpty(Gender))
                result += $" ({Gender})";
            if (HeldItem > 0)
            {
                switch (Format)
                {
                    case 2: if (HeldItem < g2items.Length)
                        result += $" @ {g2items[HeldItem]}";
                        break;
                    case 3: if (HeldItem < g3items.Length)
                        result += $" @ {g3items[HeldItem]}";
                        break;
                    default: if (HeldItem < items.Length)
                        result += $" @ {items[HeldItem]}";
                        break;
                }
            }
            return result;
        }
        private static bool GetStringStats(out IEnumerable<string> result, int[] stats, int ignore)
        {
            var list = new List<string>();
            for (int i = 0; i < stats.Length; i++)
            {
                if (stats[i] == ignore) continue; // ignore unused EVs
                list.Add($"{stats[i]} {StatNames[i]}");
            }
            result = list;
            return list.Count > 0;
        }
        private IEnumerable<string> GetStringMoves()
        {
            foreach (int move in Moves.Where(move => move != 0 && move < moves.Length))
            {
                var str = $"- {moves[move]}";
                if (move == 237) // Hidden Power
                    str += $" [{hptypes[HiddenPower.GetType(IVs)]}]";
                yield return str;
            }
        }

        /// <summary>
        /// Converts the <see cref="PKM"/> data into an importable set format for Pokémon Showdown.
        /// </summary>
        /// <param name="pkm">PKM to convert to string</param>
        /// <returns>Multi line set data</returns>
        public static string GetShowdownText(PKM pkm)
        {
            if (pkm.Species == 0)
                return string.Empty;

            string[] Forms = PKX.GetFormList(pkm.Species, types, forms, genderForms, pkm.Format);
            ShowdownSet Set = new ShowdownSet
            {
                Nickname = pkm.Nickname,
                Species = pkm.Species,
                HeldItem = pkm.HeldItem,
                Ability = pkm.Ability,
                EVs = pkm.EVs,
                IVs = pkm.IVs,
                Moves = pkm.Moves,
                Nature = pkm.Nature,
                Gender = genders[pkm.Gender < 2 ? pkm.Gender : 2],
                Friendship = pkm.CurrentFriendship,
                Level = PKX.GetLevel(pkm.Species, pkm.EXP),
                Shiny = pkm.IsShiny,
                FormIndex = pkm.AltForm,
                Form = pkm.AltForm > 0 && pkm.AltForm < Forms.Length ? Forms[pkm.AltForm] : string.Empty,
                Format = pkm.Format,
            };

            if (Set.Form == "F")
                Set.Gender = string.Empty;

            return Set.Text;
        }
        private void ParseFirstLine(string line)
        {
            // Gender Detection
            string last3 = line.Substring(line.Length - 3);
            if (last3 == "(M)" || last3 == "(F)")
            {
                Gender = last3.Substring(1, 1);
                line = line.Substring(0, line.Length - 3);
            }
            else if (line.Contains(species[678])) // Meowstic Edge Case with no gender provided
                Gender = "M";
            
            // Nickname Detection
            if (line.Contains("(") && line.Contains(")"))
                ParseSpeciesNickname(line);
            else
                ParseSpeciesForm(line);
        }
        private bool ParseSpeciesForm(string spec)
        {
            spec = spec.Trim();
            if ((Species = Array.IndexOf(species, spec)) >= 0) // success, nothing else!
                return true;

            // Forme string present.
            int end = spec.LastIndexOf('-');
            if (end < 0)
                return false;

            Species = Array.IndexOf(species, spec.Substring(0, end).Trim());
            Form = spec.Substring(end + 1);

            if (Species >= 0)
                return true;

            // failure to parse, check edge cases
            var edge = new[] {784, 250, 032, 029}; // all species with dashes in English Name (Kommo-o, Ho-Oh, Nidoran-M, Nidoran-F)
            foreach (var e in edge)
            {
                if (!spec.StartsWith(species[e].Replace("♂", "-M").Replace("♀", "-F")))
                    continue;
                Species = e;
                Form = spec.Substring(species[e].Length);
                return true;
            }

            // Version Megas
            end = spec.LastIndexOf('-', Math.Max(0, end - 1));
            if (end < 0)
                return false;
            Species = Array.IndexOf(species, spec.Substring(0, end).Trim());
            Form = spec.Substring(end + 1);

            return Species >= 0;
        }
        private void ParseSpeciesNickname(string line)
        {
            int index = line.LastIndexOf("(", StringComparison.Ordinal);
            string n1, n2;
            if (index > 1) // correct format
            {
                n1 = line.Substring(0, index - 1);
                n2 = line.Substring(index).Trim();
                n2 = ReplaceAll(n2, string.Empty, "[", "]", "(", ")"); // Trim out excess data
            }
            else // nickname first (manually created set, incorrect)
            {
                int end = line.IndexOf(")", StringComparison.Ordinal);
                n2 = line.Substring(index + 1, end - 1);
                n1 = line.Substring(end + 2);
            }

            if (ParseSpeciesForm(n2))
            {
                // successful parse on n2=>Species/Form, n1 is nickname
                Nickname = n1;
                return;
            }
            // other case is possibly true (or both invalid).
            Nickname = n2;
            ParseSpeciesForm(n1);
        }
        private string ParseLineMove(string line)
        {
            string moveString = line.Substring(line[1] == ' ' ? 2 : 1);
            if (!moveString.Contains("Hidden Power"))
                return moveString;

            // Defined Hidden Power
            if (moveString.Length > 13)
            {
                string type = moveString.Remove(0, 13);
                type = ReplaceAll(type, string.Empty, "[", "]", "(", ")"); // Trim out excess data
                int hpVal = Array.IndexOf(hptypes, type); // Get HP Type

                if (IVs.Any(z => z != 31))
                {
                    if (!HiddenPower.SetIVsForType(hpVal, IVs))
                        InvalidLines.Add($"Invalid IVs for Hidden Power Type: {type}");
                }
                else if (hpVal >= 0)
                    IVs = PKX.SetHPIVs(hpVal, IVs); // Get IVs
                else
                    InvalidLines.Add($"Invalid Hidden Power Type: {type}");
            }
            moveString = "Hidden Power";
            return moveString;
        }
        private void ParseLineEVs(string line)
        {
            string[] evlist = SplitLineStats(line);
            if (evlist.Length == 1)
                InvalidLines.Add("Unknown EV input.");
            for (int i = 0; i < evlist.Length / 2; i++)
            {
                bool valid = ushort.TryParse(evlist[i * 2 + 0], out ushort EV);
                int index = Array.IndexOf(StatNames, evlist[i * 2 + 1]);
                if (valid && index > -1)
                    EVs[index] = EV;
                else
                    InvalidLines.Add($"Unknown EV Type input: {evlist[i * 2]}");
            }
            EVs = EVsSpeedFirst;
        }
        private void ParseLineIVs(string line)
        {
            string[] ivlist = SplitLineStats(line);
            if (ivlist.Length == 1)
                InvalidLines.Add("Unknown IV input.");
            for (int i = 0; i < ivlist.Length / 2; i++)
            {
                bool valid = byte.TryParse(ivlist[i * 2 + 0], out byte IV);
                int index = Array.IndexOf(StatNames, ivlist[i * 2 + 1]);
                if (valid && index > -1)
                    IVs[index] = IV;
                else
                    InvalidLines.Add($"Unknown IV Type input: {ivlist[i * 2]}");
            }
            IVs = IVsSpeedFirst;
        }
        private static string ConvertFormToShowdown(string form, int spec)
        {
            if (string.IsNullOrWhiteSpace(form))
            {
                if (spec == 774) // Minior
                    form = "Meteor";
                return form;
            }

            switch (spec)
            {
                case 550 when form == "Blue":
                    return "Blue Striped";
                case 666 when form == "Poké Ball":
                    return "Pokeball"; // Vivillon
                case 718: // Zygarde
                    form = form.Replace("-C", string.Empty);
                    form = form.Replace("50%", string.Empty);
                    return form.Replace("100%", "Complete");
                case 774: // Minior
                    if (form.StartsWith("M-"))
                        return "Meteor";
                    return form.Replace("C-", string.Empty);
                case 800 when form == "Dusk": // Necrozma
                    return $"{form}-Mane";
                case 800 when form == "Dawn": // Necrozma
                    return $"{form}-Wings";

                case 676: // Furfrou
                case 658: // Greninja
                case 744: // Rockruff
                    return string.Empty;
                default:
                    if (Legal.Totem_USUM.Contains(spec) && form == "Large")
                        return Legal.Totem_Alolan.Contains(spec) ? "Alola-Totem" : "Totem";
                    if (form.StartsWith("Mega"))
                        return form.Replace(" ", "-");
                    return form;
            }
        }
        private static string ConvertFormFromShowdown(string form, int spec, int ability)
        {
            switch (spec)
            {
                case 550 when form == "Blue Striped": // Basculin
                    return "Blue";
                case 658 when ability == 210: // Greninja
                    return "Ash"; // Battle Bond
                case 666 when form == "Pokeball": // Vivillon
                    return "Poké Ball";

                // Zygarde
                case 718 when string.IsNullOrWhiteSpace(form) && ability == 211:
                    return "50%-C";
                case 718 when string.IsNullOrWhiteSpace(form):
                    return "50%";
                case 718 when form == "Complete":
                    return "100%";
                case 718 when ability == 211:
                    return "-C"; // Power Construct

                case 741 when form == "Pom Pom":
                    return "Pom-Pom";
                case 744 when ability == 020: // Rockruff-1
                    return "Dusk";

                // Minior
                case 774 when !string.IsNullOrWhiteSpace(form) && form != "Meteor":
                    return $"C-{form}";

                // Necrozma
                case 800 when form == "Dusk-Mane":
                    return "Dusk";
                case 800 when form == "Dawn-Wings":
                    return "Dawn";

                default:
                    if (form == null)
                        return null;
                    if (Legal.Totem_USUM.Contains(spec) && form.EndsWith("Totem"))
                        return "Large";
                    if (form.StartsWith("Mega"))
                        return form.Replace("-", " ");
                    return form;
            }
        }

        private static string[] SplitLineStats(string line)
        {
            // Because people think they can type sets out...
            return line
                .Replace("SAtk", "SpA").Replace("Sp Atk", "SpA")
                .Replace("SDef", "SpD").Replace("Sp Def", "SpD")
                .Replace("Spd", "Spe").Replace("Speed", "Spe").Split(new[] { " / ", " " }, StringSplitOptions.None);
        }
        private static string ReplaceAll(string original, string to, params string[] toBeReplaced)
        {
            return toBeReplaced.Aggregate(original, (current, v) => current.Replace(v, to));
        }

        /// <summary>
        /// Fetches <see cref="ShowdownSet"/> data from the input <see cref="lines"/>.
        /// </summary>
        /// <param name="lines">Raw lines containing numerous multi-line set data.</param>
        /// <returns><see cref="ShowdownSet"/> objects until <see cref="lines"/> is consumed.</returns>
        public static IEnumerable<ShowdownSet> GetShowdownSets(IEnumerable<string> lines)
        {
            var setLines = new List<string>(8);
            foreach (var line in lines)
            {
                if (!string.IsNullOrWhiteSpace(line))
                {
                    setLines.Add(line);
                    continue;
                }
                yield return new ShowdownSet(setLines);
                setLines.Clear();
            }
        }
    }
}