using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using pkNX.Containers;
using pkNX.Game;
using pkNX.Randomization;
using pkNX.Structures;
using pkNX.Structures.FlatBuffers;

namespace pkNX.WinForms;

public sealed partial class GGWE : Form
{
    private readonly EncounterArchive7b Tables;
    private readonly GameManagerGG ROM;
    private int entry = -1;

    public GGWE(GameManagerGG rom, EncounterArchive7b obj)
    {
        InitializeComponent();
        if (obj.EncounterTables.Length == 0 || obj.EncounterTables[0].GroundTable.Length == 0)
        {
            WinFormsUtil.Error("Bad data provided.", $"Unable to parse to {nameof(EncounterArchive7b)} data.");
            Close();
        }

        ROM = rom;

        var spec = rom.GetStrings(TextName.SpeciesNames);
        var species = (string[])spec.Clone();
        species[0] = "";
        EncounterList.SpeciesNames = species;
        var locs = rom.GetStrings(TextName.metlist_00000);

        EL_Ground.Initialize();
        EL_Water.Initialize();
        EL_Old.Initialize();
        EL_Good.Initialize();
        EL_Super.Initialize();
        EL_Sky.Initialize();

        TC_Tables.Controls.Remove(Tab_Old);
        TC_Tables.Controls.Remove(Tab_Good);
        TC_Tables.Controls.Remove(Tab_Super);
        EL_Old.OverworldSpawn = EL_Good.OverworldSpawn = EL_Super.OverworldSpawn = false;
        L_Rank.Visible = NUD_RankMin.Visible = NUD_RankMax.Visible = false;

        PG_Species.SelectedObject = EditUtil.Settings.Species;

        Tables = obj;
        LoadFile(locs);

        EL_Ground.ShowForm = false;
        EL_Water.ShowForm = false;
        EL_Old.ShowForm = false;
        EL_Good.ShowForm = false;
        EL_Super.ShowForm = false;
        EL_Sky.ShowForm = false;
        CB_Location.SelectedIndex = 0;
    }

    public void LoadFile(string[] locationNames)
    {
        var locs = Tables.EncounterTables.Select(z => z.ZoneID);
        var names = GetNames(locs, locationNames);
        var dupeNamed = GetScreenedNames(names);

        CB_Location.Items.Clear();
        CB_Location.Items.AddRange(dupeNamed.ToArray());
    }

    private static IEnumerable<string> GetNames(IEnumerable<ulong> locs, string[] locationNames)
    {
        return locs
            .Select(z => DictHash[z]) // loc internal name
            .Select(z => LocIDTable[z]) // loc ID
            .Select(z => locationNames[z]); // loc external name (pkmdata)
    }

    private static IEnumerable<string> GetScreenedNames(IEnumerable<string> names)
    {
        int ctr = 0;
        string? prev = null;
        foreach (var name in names)
        {
            if (name != prev)
            {
                ctr = 1;
                yield return name;
            }
            else
            {
                ctr++;
                yield return $"{name} ({ctr})";
            }
            prev = name;
        }
    }

    private static readonly Dictionary<string, int> LocIDTable = new()
    {
        ["forest001"] = 39,
        ["r004d0101"] = 40,
        ["r004d0102"] = 40,
        ["r004d0103"] = 40,
        ["r010d0101"] = 41,
        ["r010d0102"] = 41,
        ["r010r0101"] = 42,
        ["r011d0101"] = 43,

        ["r020d0101"] = 44,
        ["r020d0102"] = 44,
        ["r020d0103"] = 44,
        ["r020d0104_1"] = 44,
        ["r020d0104_2"] = 44,
        ["r020d0105_1"] = 44,
        ["r020d0105_2"] = 44,
        ["r023d0101"] = 45,
        ["r023d0102"] = 45,
        ["r023d0103"] = 45,
        ["road001"] = 3,
        ["road002_1"] = 4,
        ["road002_2"] = 4,
        ["road003"] = 5,
        ["road004_1"] = 6,
        ["road004_2"] = 6,
        ["road005"] = 7,
        ["road006"] = 8,
        ["road007"] = 9,
        ["road008"] = 10,
        ["road009"] = 11,
        ["road010_1"] = 12,
        ["road010_2"] = 12,
        ["road011_1"] = 13,
        ["road011_2"] = 13,
        ["road012"] = 14,
        ["road013"] = 15,
        ["road014"] = 16,
        ["road015_1"] = 17,
        ["road015_2"] = 17,
        ["road016_1"] = 18,
        ["road016_2"] = 18,
        ["road017"] = 19,
        ["road018_1"] = 20,
        ["road018_2"] = 20,
        ["road019"] = 21,
        ["road020"] = 22,
        ["road020_2"] = 22,
        ["road021"] = 23,
        ["road022"] = 24,
        ["road023"] = 25,
        ["road024"] = 26,
        ["road025"] = 27,
        ["t004d0101"] = 46,
        ["t004d0102"] = 46,
        ["t004d0103"] = 46,
        ["t005r0303"] = 47,
        ["t005r0304"] = 47,
        ["t005r0305"] = 47,
        ["t005r0306"] = 47,
        ["t009r0201"] = 51,
        ["t009r0202"] = 51,
        ["t009r0203"] = 51,
        ["t009r0204"] = 51,
        ["town001"] = 28,
        ["town002"] = 29,
        ["town003"] = 30,
        ["town004"] = 31,
        ["town005"] = 32,
        ["town006"] = 33,
        ["town007"] = 34,
        ["town008"] = 35,
        ["town009"] = 36,
    };

    private static readonly Dictionary<ulong, string> DictHash = LocIDTable
        .Select(z => new KeyValuePair<ulong, string>(FnvHash.HashFnv1a_64(z.Key), z.Key))
        .ToDictionary(z => z.Key, z => z.Value);

    private void CB_Location_SelectedIndexChanged(object sender, EventArgs e)
    {
        SaveEntry(entry);
        entry = CB_Location.SelectedIndex;
        var id = Tables.EncounterTables[entry].ZoneID;
        var iname = LocIDTable.First(z => FnvHash.HashFnv1a_64(z.Key) == id).Key;
        L_Hash.Text = Tables.EncounterTables[entry].ZoneID.ToString("X16") + " " + iname;
        LoadEntry(entry);
    }

    private void LoadEntry(int i)
    {
        var arr = Tables.EncounterTables[i];

        NUD_RankMin.Value = arr.TrainerRankMin;
        NUD_RankMax.Value = arr.TrainerRankMax;

        EL_Ground.LoadSlots(arr.GroundTable);
        EL_Water.LoadSlots(arr.WaterTable);
        EL_Old.LoadSlots(arr.OldRodTable);
        EL_Good.LoadSlots(arr.GoodRodTable);
        EL_Super.LoadSlots(arr.SuperRodTable);
        EL_Sky.LoadSlots(arr.SkyTable);

        EL_Ground.NUD_Min.Value = arr.GroundTableLevelMin;
        EL_Ground.NUD_Max.Value = arr.GroundTableLevelMax;
        EL_Ground.NUD_SpawnRate.Value = arr.GroundTableEncounterRate;
        EL_Ground.NUD_Count.Value = arr.GroundSpawnCountMax;
        EL_Ground.NUD_Duration.Value = arr.GroundSpawnDuration;

        EL_Water.NUD_Min.Value = arr.WaterTableLevelMin;
        EL_Water.NUD_Max.Value = arr.WaterTableLevelMax;
        EL_Water.NUD_SpawnRate.Value = arr.WaterTableEncounterRate;
        EL_Water.NUD_Count.Value = arr.WaterSpawnCountMax;
        EL_Water.NUD_Duration.Value = arr.WaterSpawnDuration;

        EL_Old.NUD_Min.Value = arr.OldRodTableLevelMin;
        EL_Old.NUD_Max.Value = arr.OldRodTableLevelMax;
        EL_Old.NUD_SpawnRate.Value = arr.OldRodTableEncounterRate;

        EL_Good.NUD_Min.Value = arr.GoodRodTableLevelMin;
        EL_Good.NUD_Max.Value = arr.GoodRodTableLevelMax;
        EL_Good.NUD_SpawnRate.Value = arr.GoodRodTableEncounterRate;

        EL_Super.NUD_Min.Value = arr.SuperRodTableLevelMin;
        EL_Super.NUD_Max.Value = arr.SuperRodTableLevelMax;
        EL_Super.NUD_SpawnRate.Value = arr.SuperRodTableEncounterRate;

        EL_Sky.NUD_Min.Value = arr.SkyTableLevelMin;
        EL_Sky.NUD_Max.Value = arr.SkyTableLevelMax;
        EL_Sky.NUD_SpawnRate.Value = arr.SkyTableEncounterRate;
        EL_Sky.NUD_Count.Value = arr.SkySpawnCountMax;
        EL_Sky.NUD_Duration.Value = arr.SkySpawnDuration;
    }

    private void SaveEntry(int i)
    {
        if (i < 0)
            return;
        var arr = Tables.EncounterTables[i];

        arr.TrainerRankMin = (int)NUD_RankMin.Value;
        arr.TrainerRankMax = (int)NUD_RankMax.Value;

        arr.GroundTableLevelMin = (int)EL_Ground.NUD_Min.Value;
        arr.GroundTableLevelMax = (int)EL_Ground.NUD_Max.Value;
        arr.GroundTableEncounterRate = (int)EL_Ground.NUD_SpawnRate.Value;
        arr.GroundSpawnCountMax = (int)EL_Ground.NUD_Count.Value;
        arr.GroundSpawnDuration = (int)EL_Ground.NUD_Duration.Value;

        arr.WaterTableLevelMin = (int)EL_Water.NUD_Min.Value;
        arr.WaterTableLevelMax = (int)EL_Water.NUD_Max.Value;
        arr.WaterTableEncounterRate = (int)EL_Water.NUD_SpawnRate.Value;
        arr.WaterSpawnCountMax = (int)EL_Water.NUD_Count.Value;
        arr.WaterSpawnDuration = (int)EL_Water.NUD_Duration.Value;

        arr.OldRodTableLevelMin = (int)EL_Old.NUD_Min.Value;
        arr.OldRodTableLevelMax = (int)EL_Old.NUD_Max.Value;
        arr.OldRodTableEncounterRate = (int)EL_Old.NUD_SpawnRate.Value;

        arr.GoodRodTableLevelMin = (int)EL_Good.NUD_Min.Value;
        arr.GoodRodTableLevelMax = (int)EL_Good.NUD_Max.Value;
        arr.GoodRodTableEncounterRate = (int)EL_Good.NUD_SpawnRate.Value;

        arr.SuperRodTableLevelMin = (int)EL_Super.NUD_Min.Value;
        arr.SuperRodTableLevelMax = (int)EL_Super.NUD_Max.Value;
        arr.SuperRodTableEncounterRate = (int)EL_Super.NUD_SpawnRate.Value;

        arr.SkyTableLevelMin = (int)EL_Sky.NUD_Min.Value;
        arr.SkyTableLevelMax = (int)EL_Sky.NUD_Max.Value;
        arr.SkyTableEncounterRate = (int)EL_Sky.NUD_SpawnRate.Value;
        arr.SkySpawnCountMax = (int)EL_Sky.NUD_Count.Value;
        arr.SkySpawnDuration = (int)EL_Sky.NUD_Duration.Value;

        EL_Ground.SaveCurrent();
        EL_Water.SaveCurrent();
        EL_Old.SaveCurrent();
        EL_Good.SaveCurrent();
        EL_Super.SaveCurrent();
        EL_Sky.SaveCurrent();
    }

    private void B_Save_Click(object sender, EventArgs e)
    {
        SaveEntry(entry);
        EL_Ground.SaveCurrent();
        EL_Water.SaveCurrent();
        EL_Old.SaveCurrent();
        EL_Good.SaveCurrent();
        EL_Super.SaveCurrent();
        EL_Sky.SaveCurrent();

        DialogResult = DialogResult.OK;

        Close();
    }

    private void B_ModCount_Click(object sender, EventArgs e)
    {
        SaveEntry(entry);
        foreach (var area in Tables.EncounterTables)
        {
            if (area.GroundSpawnCountMax != 0)
                area.GroundSpawnCountMax = (int)NUD_ModCount.Value;
            if (area.WaterSpawnCountMax != 0)
                area.WaterSpawnCountMax = (int)NUD_ModCount.Value;
            if (area.SkySpawnCountMax != 0)
                area.SkySpawnCountMax = (int)NUD_ModCount.Value;
        }
        LoadEntry(entry);
        System.Media.SystemSounds.Asterisk.Play();
    }

    private void B_ModRate_Click(object sender, EventArgs e)
    {
        SaveEntry(entry);
        foreach (var area in Tables.EncounterTables)
        {
            if (area.GroundTableEncounterRate != 0)
                area.GroundTableEncounterRate = (int)NUD_ModCount.Value;
            if (area.WaterTableEncounterRate != 0)
                area.WaterTableEncounterRate = (int)NUD_ModCount.Value;
            if (area.SkyTableEncounterRate != 0)
                area.SkyTableEncounterRate = (int)NUD_ModCount.Value;
        }
        LoadEntry(entry);
        System.Media.SystemSounds.Asterisk.Play();
    }

    private void B_ModDuration_Click(object sender, EventArgs e)
    {
        SaveEntry(entry);
        foreach (var area in Tables.EncounterTables)
        {
            if (area.GroundSpawnDuration != 0)
                area.GroundSpawnDuration = (int)NUD_ModDuration.Value;
            if (area.WaterSpawnDuration != 0)
                area.WaterSpawnDuration = (int)NUD_ModDuration.Value;
            if (area.SkySpawnDuration != 0)
                area.SkySpawnDuration = (int)NUD_ModDuration.Value;
        }
        LoadEntry(entry);
        System.Media.SystemSounds.Asterisk.Play();
    }

    private void B_RandAll_Click(object sender, EventArgs e)
    {
        SaveEntry(entry);
        var settings = (SpeciesSettings)PG_Species.SelectedObject;
        settings.Gen2 = settings.Gen3 = settings.Gen4 = settings.Gen5 = settings.Gen6 = settings.Gen7 = false;
        var rand = new SpeciesRandomizer(ROM.Info, ROM.Data.PersonalData);
        rand.Initialize(settings, 808, 809);
        RandomizeWild(rand, CHK_FillEmpty.Checked, CHK_Level.Checked);
        LoadEntry(entry);
        System.Media.SystemSounds.Asterisk.Play();
    }

    private void RandomizeWild(SpeciesRandomizer rand, bool fill, bool boost)
    {
        var pt = ROM.Data.PersonalData;
        bool IsGrassOrWater(int s) => pt[s].IsType(Types.Water) || pt[s].IsType(Types.Grass);

        foreach (var area in Tables.EncounterTables)
        {
            if (boost)
            {
                area.GroundTableLevelMin = Legal.GetModifiedLevel(area.GroundTableLevelMin, (double)NUD_LevelBoost.Value);
                area.GroundTableLevelMax = Legal.GetModifiedLevel(area.GroundTableLevelMax, (double)NUD_LevelBoost.Value);

                area.WaterTableLevelMin = Legal.GetModifiedLevel(area.WaterTableLevelMin, (double)NUD_LevelBoost.Value);
                area.WaterTableLevelMax = Legal.GetModifiedLevel(area.WaterTableLevelMax, (double)NUD_LevelBoost.Value);

                area.SkyTableLevelMin = Legal.GetModifiedLevel(area.SkyTableLevelMin, (double)NUD_LevelBoost.Value);
                area.SkyTableLevelMax = Legal.GetModifiedLevel(area.SkyTableLevelMax, (double)NUD_LevelBoost.Value);
            }
            ApplyRand(area.GroundTable);
            ApplyRand(area.WaterTable);
            ApplyRand(area.SkyTable);

            ApplyRand(area.OldRodTable);
            ApplyRand(area.GoodRodTable);
            ApplyRand(area.SuperRodTable);
        }

        void ApplyRand(IList<EncounterSlot7b> slots)
        {
            if (slots[0].Species == 0)
                return;

            for (int i = 0; i < slots.Count; i++)
            {
                var s = slots[i];
                if (s.Species == 0)
                {
                    if (!fill)
                        continue;
                    s.Species = slots.FirstOrDefault(z => z.Species != 0)?.Species ?? rand.GetRandomSpecies();
                }

                s.Species = rand.GetRandomSpecies(s.Species);
                s.Form = 0; // mega & alolan forms don't spawn :(
                if (fill)
                    s.Probability = RandomScaledRates[slots.Count][i];
            }
        }

        if (CHK_ForceType.Checked)
        {
            var table = Tables.EncounterTables[0];
            var slots = table.GroundTable;
            while (!slots.Any(z => IsGrassOrWater(z.Species)))
                ApplyRand(slots);
        }
    }

    public static readonly Dictionary<int, int[]> RandomScaledRates = new()
    {
        [01] = new[] { 100 },
        [04] = new[] { 60, 30, 7, 3 },
        [05] = new[] { 40, 30, 18, 10, 2 },
        [10] = new[] { 20, 15, 15, 10, 10, 10, 10, 5, 4, 1 },
    };

    private void B_Dump_Click(object sender, EventArgs e)
    {
        var strings = GetEncounterTableSummary(ROM, Tables);
        var result = string.Join(Environment.NewLine, strings);
        Clipboard.SetText(result);
        System.Media.SystemSounds.Asterisk.Play();
    }

    private static IEnumerable<string> GetEncounterTableSummary(GameManager rom, EncounterArchive7b table)
    {
        var locationNames = rom.GetStrings(TextName.metlist_00000);
        var specs = rom.GetStrings(TextName.SpeciesNames);

        var locs = table.EncounterTables.Select(z => z.ZoneID);
        var names = GetNames(locs, locationNames);
        var dupeNamed = GetScreenedNames(names).ToArray();
        return EncounterTable7bUtil.GetLines(table, dupeNamed, specs);
    }
}