using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using PKHeX.Core;
using PKHeX.WinForms.Properties;

namespace PKHeX.WinForms.Controls
{
    public sealed class BoxMenuStrip : ContextMenuStrip
    {
        private readonly SAVEditor sav;
        private readonly List<ItemVisibility> CustomItems = new List<ItemVisibility>();

        public BoxMenuStrip(SAVEditor SAV)
        {
            sav = SAV;
            foreach (Level z in Enum.GetValues(typeof(Level)))
            {
                var ctrl = new ToolStripMenuItem {Name = $"mnu_{z}", Text = z.ToString(), Image = GetImage(z)};
                Items.Add(ctrl);
            }

            AddItem(Level.Delete, GetItem("All", "Clear", () => Clear(), Resources.nocheck));
            AddItem(Level.Delete, GetItem("Eggs", "Eggs", () => Clear(pk => ModifierKeys == Keys.Control != pk.IsEgg), Resources.about), s => s.Generation >= 2);
            AddItem(Level.Delete, GetItem("PastGen", "Past Generation", () => Clear(pk => pk.GenNumber != sav.SAV.Generation), Resources.bak), s => s.Generation >= 4);
            AddItem(Level.Delete, GetItem("Foreign", "Foreign", () => Clear(pk => !sav.SAV.IsOriginalHandler(pk, pk.Format > 2)), Resources.users));
            AddItem(Level.Delete, GetItem("Untrained", "Untrained", () => Clear(pk => pk.EVTotal == 0), Resources.gift));
            AddItem(Level.Delete, GetItem("Itemless", "No Held Item", () => Clear(pk => pk.HeldItem == 0), Resources.main), s => s.Generation >= 2);
            AddItem(Level.Delete, GetItem("Illegal", "Illegal", () => Clear(pk => ModifierKeys == Keys.Control != !new LegalityAnalysis(pk).Valid), Resources.export));

            AddItem(Level.SortBox, GetItem("Species", "Pokédex No.", () => Sort(PKMSorting.OrderBySpecies), Resources.numlohi));
            AddItem(Level.SortBox, GetItem("SpeciesRev", "Pokédex No. (Reverse)", () => Sort(PKMSorting.OrderByDescendingSpecies), Resources.numhilo));
            AddItem(Level.SortBox, GetItem("Level", "Level (Low to High)", () => Sort(PKMSorting.OrderByLevel), Resources.vallohi));
            AddItem(Level.SortBox, GetItem("LevelRev", "Level (High to Low)", () => Sort(PKMSorting.OrderByDescendingLevel), Resources.valhilo));
            AddItem(Level.SortBox, GetItem("Date", "Met Date", () => Sort(PKMSorting.OrderByDateObtained), Resources.date), s => s.Generation >= 4);
            AddItem(Level.SortBox, GetItem("Name", "Species Name", () => Sort(list => list.OrderBySpeciesName(GameInfo.Strings.Species)), Resources.alphaAZ));
            AddItem(Level.SortBox, GetItem("Shiny", "Shiny", () => Sort(list => list.OrderByCustom(pk => !pk.IsShiny)), Resources.showdown));
            AddItem(Level.SortBox, GetItem("Random", "Random", () => Sort(list => list.OrderByCustom(_ => Util.Rand32())), Resources.wand));

            AddItem(Level.SortBoxAdvanced, GetItem("Usage", "Usage", () => Sort(PKMSorting.OrderByUsage), Resources.heart), s => s.Generation >= 3);
            AddItem(Level.SortBoxAdvanced, GetItem("Potential", "IV Potential", () => Sort(list => list.OrderByCustom(pk => pk.MaxIV * 6 - pk.IVTotal)), Resources.numhilo));
            AddItem(Level.SortBoxAdvanced, GetItem("Training", "EV Training", () => Sort(list => list.OrderByCustom(pk => pk.MaxEV * 6 - pk.EVTotal)), Resources.showdown));
            AddItem(Level.SortBoxAdvanced, GetItem("Owner", "Ownership", () => Sort(list => list.OrderByOwnership(sav.SAV)), Resources.users));
            AddItem(Level.SortBoxAdvanced, GetItem("Type", "Type", () => Sort(list => list.OrderByCustom(pk => pk.PersonalInfo.Type1, pk => pk.PersonalInfo.Type2)), Resources.main));
            AddItem(Level.SortBoxAdvanced, GetItem("Version", "Version", () => Sort(list => list.OrderByCustom(pk => pk.GenNumber, pk => pk.Version)), Resources.numlohi), s => s.Generation >= 3);
            AddItem(Level.SortBoxAdvanced, GetItem("BST", "Base Stat Total", () => Sort(list => list.OrderByCustom(pk => pk.PersonalInfo.BST)), Resources.vallohi));
            AddItem(Level.SortBoxAdvanced, GetItem("Legal", "Legal", () => Sort(list => list.OrderByCustom(pk => !new LegalityAnalysis(pk).Valid)), Resources.export));

            AddItem(Level.Modify, GetItem("HatchEggs", "Hatch Eggs", () => Modify(z => z.ForceHatchPKM()), Resources.about), s => s.Generation >= 2);
            AddItem(Level.Modify, GetItem("MaxFriendship", "Max Friendship", () => Modify(z => z.MaximizeFriendship()), Resources.heart));
            AddItem(Level.Modify, GetItem("MaxLevel", "Max Level", () => Modify(z => z.MaximizeLevel()), Resources.showdown));
            AddItem(Level.Modify, GetItem("ResetMoves", "Reset Moves", () => Modify(z => z.SetMoves(z.GetMoveSet())), Resources.date), s => s.Generation >= 3);
            AddItem(Level.Modify, GetItem("RandomMoves", "Randomize Moves", () => Modify(z => z.SetMoves(z.GetMoveSet(true))), Resources.wand));
            AddItem(Level.Modify, GetItem("HyperTrain", "Hyper Train", () => Modify(z => z.SetSuggestedHyperTrainingData()), Resources.vallohi), s => s.Generation >= 7);
            AddItem(Level.Modify, GetItem("RemoveNicknames", "Remove Nicknames", () => Modify(z => z.SetDefaultNickname()), Resources.alphaAZ));
            AddItem(Level.Modify, GetItem("RemoveItem", "Delete Held Item", () => Modify(z => z.HeldItem = 0), Resources.gift), s => s.Generation >= 2);
        }

        private enum Level
        {
            Delete,
            SortBox,
            SortBoxAdvanced,
            Modify,
        }

        private sealed class ItemVisibility
        {
            private readonly ToolStripItem Item;
            private readonly Func<SaveFile, bool> IsVisible;

            public ItemVisibility(ToolStripItem toolStripItem, Func<SaveFile, bool> visible)
            {
                Item = toolStripItem;
                IsVisible = visible;
            }

            public void SetVisibility(SaveFile s) => Item.Visible = IsVisible(s);
        }

        public void ToggleVisibility()
        {
            foreach (var s in CustomItems)
                s.SetVisibility(sav.SAV);
        }

        private static Image GetImage(Level l)
        {
            switch (l)
            {
                case Level.Delete: return Resources.nocheck;
                case Level.SortBox: return Resources.swapBox;
                case Level.SortBoxAdvanced: return Resources.settings;
                case Level.Modify: return Resources.wand;
                default: return null;
            }
        }

        private static ToolStripItem GetItem(string name, string text, Action action, Image img)
        {
            var tsi = new ToolStripMenuItem { Name = name, Text = text, Image = img };
            tsi.Click += (s, e) => action();
            return tsi;
        }

        private void AddItem(Level v, ToolStripItem t, Func<SaveFile, bool> visible = null)
        {
            var item = (ToolStripMenuItem)Items[(int)v];
            t.Name = item.Name + t.Name;
            item.DropDownItems.Add(t);
            CustomItems.Add(new ItemVisibility(t, visible ?? (_ => true)));
        }

        private static bool All => (ModifierKeys & Keys.Shift) != 0;
        private static bool Reverse => (ModifierKeys & Keys.Control) != 0;
        private void Clear(Func<PKM, bool> criteria = null)
        {
            if (All)
                sav.ClearAll(criteria);
            else
                sav.ClearCurrent(criteria);
        }
        private void Sort(Func<IEnumerable<PKM>, IEnumerable<PKM>> sorter)
        {
            if (All)
                sav.SortAll(sorter, Reverse);
            else
                sav.SortCurrent(sorter, Reverse);
        }
        private void Modify(Action<PKM> action)
        {
            if (All)
                sav.ModifyAll(action);
            else
                sav.ModifyCurrent(action);
        }
    }
}