using System;
using System.Collections.Generic;
using System.Linq;
using static PKHeX.Core.EncounterUtil;
using static PKHeX.Core.GameVersion;

namespace PKHeX.Core
{
    internal static class Encounters7b
    {
        internal static readonly EncounterArea7b[] SlotsGP = EncounterArea7b.GetAreas(Get("gp", "gg"), GP);
        internal static readonly EncounterArea7b[] SlotsGE = EncounterArea7b.GetAreas(Get("ge", "gg"), GE);
        private static byte[][] Get(string resource, string ident) => BinLinker.Unpack(Util.GetBinaryResource($"encounter_{resource}.pkl"), ident);

        static Encounters7b()
        {
            ManuallyAddRareSpawns(SlotsGP);
            ManuallyAddRareSpawns(SlotsGE);
        }

        private static readonly EncounterStatic7b[] Encounter_GG =
        {
            // encounters
            new(GG) { Species = 144, Level = 50, Location = 44, FlawlessIVCount = 3, }, // Articuno @ Seafoam Islands
            new(GG) { Species = 145, Level = 50, Location = 42, FlawlessIVCount = 3, }, // Zapdos @ Power Plant
            new(GG) { Species = 146, Level = 50, Location = 45, FlawlessIVCount = 3, }, // Moltres @ Victory Road
            new(GG) { Species = 150, Level = 70, Location = 46, FlawlessIVCount = 3, }, // Mewtwo @ Cerulean Cave
            new(GG) { Species = 143, Level = 34, Location = 14, FlawlessIVCount = 3, }, // Snorlax @ Route 12
            new(GG) { Species = 143, Level = 34, Location = 18, FlawlessIVCount = 3, }, // Snorlax @ Route 16
            // unused new EncounterStatic7b { Species = 100, Level = 42, Location = 42, FlawlessIVCount = 3, }, // Voltorb @ Power Plant
            // collision new EncounterStatic7b { Species = 101, Level = 42, Location = 42, FlawlessIVCount = 3, }, // Electrode @ Power Plant

            // gifts
            new(GP) { Species = 025, Level = 05, Location = 28, Gift = true, IVs = new[] {31,31,31,31,31,31}, Shiny = Shiny.Never, Form = 8 }, // Pikachu @ Pallet Town
            new(GE) { Species = 133, Level = 05, Location = 28, Gift = true, IVs = new[] {31,31,31,31,31,31}, Shiny = Shiny.Never, Form = 1 }, // Eevee @ Pallet Town

            new(GG) { Species = 129, Level = 05, Location = 06, Gift = true, IVs = new[] {30,31,25,30,25,25} }, // Magikarp @ Route 4

            // unused new EncounterStatic7b { Species = 133, Level = 30, Location = 34, Gift = true }, // Eevee @ Celadon City
            new(GG) { Species = 131, Level = 34, Location = 52, Gift = true, IVs = new[] {31,25,25,25,30,30} }, // Lapras @ Saffron City (Silph Co. Employee, inside)
            new(GG) { Species = 106, Level = 30, Location = 38, Gift = true, IVs = new[] {25,30,25,31,25,30} }, // Hitmonlee @ Saffron City (Karate Master)
            new(GG) { Species = 107, Level = 30, Location = 38, Gift = true, IVs = new[] {25,31,30,25,25,30} }, // Hitmonchan @ Saffron City (Karate Master)
            new(GG) { Species = 140, Level = 44, Location = 36, Gift = true, FlawlessIVCount = 3 }, // Kabuto @ Cinnabar Island (Cinnabar Pokémon Lab)
            new(GG) { Species = 138, Level = 44, Location = 36, Gift = true, FlawlessIVCount = 3 }, // Omanyte @ Cinnabar Island (Cinnabar Pokémon Lab)
            new(GG) { Species = 142, Level = 44, Location = 36, Gift = true, FlawlessIVCount = 3 }, // Aerodactyl @ Cinnabar Island (Cinnabar Pokémon Lab)
            new(GG) { Species = 001, Level = 12, Location = 31, Gift = true, IVs = new[] {31,25,30,25,25,30} }, // Bulbasaur @ Cerulean City
            new(GG) { Species = 004, Level = 14, Location = 26, Gift = true, IVs = new[] {25,30,25,31,30,25} }, // Charmander @ Route 24
            new(GG) { Species = 007, Level = 16, Location = 33, Gift = true, IVs = new[] {25,25,30,25,31,30} }, // Squirtle @ Vermillion City
            new(GG) { Species = 137, Level = 34, Location = 38, Gift = true, IVs = new[] {25,25,30,25,31,30} }, // Porygon @ Saffron City (Silph Co. Employee, outside)
            new(GP) { Species = 053, Level = 16, Location = 33, Gift = true, IVs = new[] {30,30,25,31,25,25} }, // Persian @ Vermillion City (Outside Fan Club)
            new(GE) { Species = 059, Level = 16, Location = 33, Gift = true, IVs = new[] {25,30,25,31,30,25} }, // Arcanine @ Vermillion City (Outside Fan Club)
        };

        private static readonly string[] T1 = { string.Empty, "ミニコ", "Tatianna", "BarbaRatatta", "Addoloratta", "Barbaratt", string.Empty, "Tatiana", "미니꼬", "小幂妮", "小幂妮", };
        private static readonly string[] T2 = { string.Empty, "ボーアイス", "Nicholice", "Iceman-4L0L4", "Goffreddo", "Eisper", string.Empty, "Gelasio", "보아이스", "露冰冰", "露冰冰", };
        private static readonly string[] T3 = { string.Empty, "レディダグ", "Diggette", "Taupilady", "Lady Glett", "Digga", string.Empty, "Glenda", "레이디그다", "蒂淑", "蒂淑", };
        private static readonly string[] T4 = { string.Empty, "ワルモン", "Darko", "AlolaZeDark", "Mattetro", "Bösbert", string.Empty, "Sinesio", "나뻐기", "达怀丹", "达怀丹", };
        private static readonly string[] T5 = { string.Empty, "エリッチ", "Psytrice", "TopDeTonCœur", "Chulia", "Assana", string.Empty, "Menchu", "엘리츄", "晶莹丘", "晶莹丘", };
        private static readonly string[] T6 = { string.Empty, "ジェンガラ", "Genmar", "OSS-Dandy7", "Mr. Owak", "Knoggelius", string.Empty, "Mario", "젠구리", "申史加拉", "申史加拉", };
        private static readonly string[] T7 = { string.Empty, "マニシ", "Exemann", "Koko-fan", "Exechiele", "Einrich", string.Empty, "Gunter", "마니시", "艾浩舒", "艾浩舒", };
        private static readonly string[] T8 = { string.Empty, "コツブ", "Higeo", "Montagnou", "George", "Karstein", string.Empty, "Georgie", "산돌", "科布", "科布", };

        internal static readonly EncounterTrade7b[] TradeGift_GG =
        {
            // Random candy values! They can be zero so no impact on legality even though statistically rare.
            new(GG) { Species = 019, Form = 1, Level = 12, TrainerNames = T1, TID7 = 121106, OTGender = 1, IVs = new[] {31,31,-1,-1,-1,-1} }, // Rattata @ Cerulean City, AV rand [0-5)
            new(GP) { Species = 027, Form = 1, Level = 27, TrainerNames = T2, TID7 = 703019, OTGender = 0, IVs = new[] {-1,31,31,-1,-1,-1} }, // Sandshrew @ Celadon City, AV rand [0-5)
            new(GE) { Species = 037, Form = 1, Level = 27, TrainerNames = T2, TID7 = 703019, OTGender = 0, IVs = new[] {-1,-1,-1,31,31,-1} }, // Vulpix @ Celadon City, AV rand [0-5)
            new(GG) { Species = 050, Form = 1, Level = 25, TrainerNames = T3, TID7 = 520159, OTGender = 1, IVs = new[] {-1,31,-1,31,-1,-1} }, // Diglett @ Lavender Town, AV rand [0-5)
            new(GE) { Species = 052, Form = 1, Level = 44, TrainerNames = T4, TID7 = 000219, OTGender = 0, IVs = new[] {31,-1,-1,31,-1,-1} }, // Meowth @ Cinnabar Island, AV rand [0-10)
            new(GP) { Species = 088, Form = 1, Level = 44, TrainerNames = T4, TID7 = 000219, OTGender = 0, IVs = new[] {31,31,-1,-1,-1,-1} }, // Grimer @ Cinnabar Island, AV rand [0-10)
            new(GG) { Species = 026, Form = 1, Level = 30, TrainerNames = T5, TID7 = 940711, OTGender = 1, IVs = new[] {-1,-1,-1,31,31,-1} }, // Raichu @ Saffron City, AV rand [0-10)
            new(GG) { Species = 105, Form = 1, Level = 38, TrainerNames = T6, TID7 = 102595, OTGender = 0, IVs = new[] {-1,31,31,-1,-1,-1} }, // Marowak @ Fuchsia City, AV rand [0-10)
            new(GG) { Species = 103, Form = 1, Level = 46, TrainerNames = T7, TID7 = 060310, OTGender = 0, IVs = new[] {-1,31,-1,-1,31,-1} }, // Exeggutor @ Indigo Plateau, AV rand [0-15)
            new(GG) { Species = 074, Form = 1, Level = 16, TrainerNames = T8, TID7 = 551873, OTGender = 0, IVs = new[] {31,31,-1,-1,-1,-1} }, // Geodude @ Vermilion City, AV rand [0-5)
        };

        private class RareSpawn
        {
            public readonly int Species;
            public readonly byte[] Locations;

            protected internal RareSpawn(int species, params byte[] locations)
            {
                Species = species;
                Locations = locations;
            }
        }

        private static readonly byte[] Sky = {003, 004, 005, 006, 009, 010, 011, 012, 013, 014, 015, 016, 017, 018, 019, 020, 021, 022, 023, 024, 025, 026, 027};

        private static readonly RareSpawn[] Rare =
        {
            // Normal
            new(001, 039),
            new(004, 005, 006, 041),
            new(007, 026, 027, 044),
            new(106, 045),
            new(107, 045),
            new(113, 007, 008, 010, 011, 012, 013, 014, 015, 016, 017, 018, 019, 020, 023, 025, 040, 042, 043, 045, 047, 051),
            new(137, 009),
            new(143, 046),

            // Water
            new(131, 021, 022),

            // Fly
            new(006, Sky),
            new(144, Sky),
            new(145, Sky),
            new(146, Sky),
            new(149, Sky),
        };

        private static void ManuallyAddRareSpawns(IEnumerable<EncounterArea7b> areas)
        {
            foreach (var table in areas)
            {
                var loc = table.Location;
                var species = Rare.Where(z => z.Locations.Contains((byte)loc)).Select(z => z.Species).ToArray();
                if (species.Length == 0)
                    continue;
                var slots = table.Slots;
                var first = slots[0];
                var extra = species
                    .Select(z => new EncounterSlot7b(table, z, (z is 006 or >= 144) ? 03 : first.LevelMin, (z is 006 or >= 144) ? 56 : first.LevelMax)).ToArray();

                int count = slots.Length;
                Array.Resize(ref slots, count + extra.Length);
                extra.CopyTo(slots, count);
                table.Slots = slots;
            }
        }

        internal static readonly EncounterStatic[] StaticGP = GetEncounters(Encounter_GG, GP);
        internal static readonly EncounterStatic[] StaticGE = GetEncounters(Encounter_GG, GE);
    }
}