using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using CultMath;
using static CultMath.math;

public class TradeMenu : MonoBehaviour
{
    public ActionGameManager GameManager;
    public ContextMenu ContextMenu;
    public ConfirmationDialog Dialog;
    public Button NewFilterButton;
    public Prototype FilterPrototype;
    public SizeFilter MinimumSizeFilter;
    public SizeFilter MaximumSizeFilter;
    public PropertiesPanel Properties;
    public Spreadsheet Spreadsheet;
    public TextMeshProUGUI TargetCargoLabel;
    public Button FoldoutButton;
    public TextMeshProUGUI CreditsLabel;

    private EquippedCargoBay _targetCargo;
    // False lists the station's wares to buy; true lists the selected bay's goods to sell.
    private bool _selling;
    private (ItemFilter filter, HardpointType type) _hardpointFilter;
    private (ItemFilter filter, SimpleCommodityCategory type) _commodityFilter;
    private (ItemFilter filter, CompoundCommodityCategory type) _compoundCommodityFilter;
    private List<(ItemFilter filter, Type type)> _behaviorFilters = new List<(ItemFilter filter, Type type)>();
    
    public EquippedCargoBay Inventory { get; set; }
    
    private void OnEnable()
    {
        if (GameManager.DockedEntity == null) return;
        _targetCargo = GameManager.DockingBay;
        _selling = false;
        TargetCargoLabel.text = "Docking Bay";
        Properties.GameManager = GameManager;
        UpdateCreditsLabel();
        
        MinimumSizeFilter.Width.onEndEdit.RemoveAllListeners();
        MinimumSizeFilter.Width.onEndEdit.AddListener(_ => Populate());
        
        MinimumSizeFilter.Height.onEndEdit.RemoveAllListeners();
        MinimumSizeFilter.Height.onEndEdit.AddListener(_ => Populate());
        
        MaximumSizeFilter.Width.onEndEdit.RemoveAllListeners();
        MaximumSizeFilter.Width.onEndEdit.AddListener(_ => Populate());
        
        MaximumSizeFilter.Height.onEndEdit.RemoveAllListeners();
        MaximumSizeFilter.Height.onEndEdit.AddListener(_ => Populate());
        
        NewFilterButton.onClick.AddListener(() =>
        {
            ContextMenu.Clear();
            IEnumerable<HardpointType> hardpointTypes = (HardpointType[]) Enum.GetValues(typeof(HardpointType));
            if (_hardpointFilter.filter != null)
                hardpointTypes = hardpointTypes.Where(x => x != _hardpointFilter.type);
            
            IEnumerable<SimpleCommodityCategory> commodityTypes = (SimpleCommodityCategory[]) Enum.GetValues(typeof(SimpleCommodityCategory));
            if (_commodityFilter.filter != null)
                commodityTypes = commodityTypes.Where(x => x != _commodityFilter.type);
            
            IEnumerable<CompoundCommodityCategory> compoundCommodityTypes = (CompoundCommodityCategory[]) Enum.GetValues(typeof(CompoundCommodityCategory));
            if (_compoundCommodityFilter.filter != null)
                compoundCommodityTypes = compoundCommodityTypes.Where(x => x != _compoundCommodityFilter.type);
            
            ContextMenu.AddDropdown("Gear Type", hardpointTypes
                .Select<HardpointType, (string, Action, bool)>(x => (Enum.GetName(typeof(HardpointType), x), () =>
                {
                    if (!_hardpointFilter.filter)
                    {
                        _hardpointFilter.filter = FilterPrototype.Instantiate<ItemFilter>();
                        _hardpointFilter.filter.OnDisable += () =>
                        {
                            _hardpointFilter.filter = null;
                            Populate();
                        };
                    }
                    if(_commodityFilter.filter)
                    {
                        _commodityFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _commodityFilter.filter = null;
                    }
                    if(_compoundCommodityFilter.filter)
                    {
                        _compoundCommodityFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _compoundCommodityFilter.filter = null;
                    }

                    _hardpointFilter.filter.Label.text = $"Hardpoint: {Enum.GetName(typeof(HardpointType), x)}";
                    _hardpointFilter.type = x;
                    Populate();
                }, true)));
            ContextMenu.AddDropdown("Simple Commodity", commodityTypes
                .Select<SimpleCommodityCategory, (string, Action, bool)>(x => (Enum.GetName(typeof(SimpleCommodityCategory), x), () =>
                {
                    if (!_commodityFilter.filter)
                    {
                        _commodityFilter.filter = FilterPrototype.Instantiate<ItemFilter>();
                        _commodityFilter.filter.OnDisable += () =>
                        {
                            _commodityFilter.filter = null;
                            Populate();
                        };
                    }
                    if(_hardpointFilter.filter)
                    {
                        _hardpointFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _hardpointFilter.filter = null;
                    }
                    if(_compoundCommodityFilter.filter)
                    {
                        _compoundCommodityFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _compoundCommodityFilter.filter = null;
                    }

                    _commodityFilter.filter.Label.text = $"Hardpoint: {Enum.GetName(typeof(SimpleCommodityCategory), x)}";
                    _commodityFilter.type = x;
                    Populate();
                }, true)));
            ContextMenu.AddDropdown("Compound Commodity", compoundCommodityTypes
                .Select<CompoundCommodityCategory, (string, Action, bool)>(x => (Enum.GetName(typeof(CompoundCommodityCategory), x), () =>
                {
                    if (!_compoundCommodityFilter.filter)
                    {
                        _compoundCommodityFilter.filter = FilterPrototype.Instantiate<ItemFilter>();
                        _compoundCommodityFilter.filter.OnDisable += () =>
                        {
                            _compoundCommodityFilter.filter = null;
                            Populate();
                        };
                    }
                    if(_hardpointFilter.filter)
                    {
                        _hardpointFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _hardpointFilter.filter = null;
                    }
                    if(_commodityFilter.filter)
                    {
                        _commodityFilter.filter.GetComponent<Prototype>().ReturnToPool();
                        _commodityFilter.filter = null;
                    }

                    _compoundCommodityFilter.filter.Label.text = $"Hardpoint: {Enum.GetName(typeof(CompoundCommodityCategory), x)}";
                    _compoundCommodityFilter.type = x;
                    Populate();
                }, true)));
            ContextMenu.AddDropdown("Item Behavior", typeof(BehaviorData).GetAllChildClasses()
                .Where(x=> x.GetCustomAttribute<RuntimeInspectable>() != null && _behaviorFilters.All(f => f.type != x))
                .Select<Type, (string, Action, bool)>(x=> (x.Name.FormatTypeName(), () =>
                {
                    var matchingType = _behaviorFilters.FirstOrDefault(y => y.type.IsAssignableFrom(x) || x.IsAssignableFrom(y.type));
                    if (matchingType.filter != null) matchingType.filter.DisableButton.onClick.Invoke();
                    var filter = FilterPrototype.Instantiate<ItemFilter>();
                    filter.Label.text = x.Name.FormatTypeName();
                    filter.OnDisable += () =>
                    {
                        _behaviorFilters.Remove((filter, x));
                        Populate();
                    };
                    _behaviorFilters.Add((filter, x));
                    Populate();
                }, true)));
            if(!MinimumSizeFilter.gameObject.activeSelf)
                ContextMenu.AddOption("Minimum Size",
                    () =>
                    {
                        MinimumSizeFilter.gameObject.SetActive(true);
                        MinimumSizeFilter.OnDisable += () => Populate();
                    });
            if(!MaximumSizeFilter.gameObject.activeSelf)
                ContextMenu.AddOption("Maximum Size",
                    () =>
                    {
                        MaximumSizeFilter.gameObject.SetActive(true);
                        MaximumSizeFilter.OnDisable += () => Populate();
                    });
            ContextMenu.Show();
        });
        Populate();
    }

    void Populate()
    {
        var columns = new List<(string name, int size, Func<(ItemInstance item, ItemData data), Func<string>> output, Func<ItemData, IComparable> sortKey)>();
        
        columns.Add(("Name", 3,
            x => () => x.item is CraftedItemInstance craftedItemInstance ? 
                $"<color=#{ColorUtility.ToHtmlStringRGB(GameManager.ItemManager.GetTier(craftedItemInstance).tier.Color.ToColor())}>{x.data.Name}" : 
                x.data.Name, 
            data => data.Name));
        if(_hardpointFilter.filter==null)
            columns.Add(("Type", 2,
                x => () =>
                {
                    if (x.data is SimpleCommodityData s) return Enum.GetName(typeof(SimpleCommodityCategory), s.Category);
                    if(x.data is CompoundCommodityData c) return Enum.GetName(typeof(CompoundCommodityCategory), c.Category);
                    if(x.data is EquippableItemData e) return Enum.GetName(typeof(HardpointType), e.HardpointType);
                    return "None";
                }, 
                data => 
                {
                    if (data is SimpleCommodityData s) return (int) s.Category;
                    var offset = Enum.GetValues(typeof(SimpleCommodityCategory)).Length;
                    if(data is CompoundCommodityData c) return (int) c.Category + offset;
                    offset += Enum.GetValues(typeof(CompoundCommodityCategory)).Length;
                    if(data is EquippableItemData e) return (int) e.HardpointType + offset;
                    return 0;
                }));
        columns.Add(("Mass", 1,
            x => () => ActionGameManager.PlayerSettings.Format(x.data.Mass), 
            data => data.Mass));
        columns.Add(("Price", 1,
            x => () => (x.item is CraftedItemInstance craftedItemInstance ? GameManager.ItemManager.GetPrice(craftedItemInstance) : x.data.Price).ToString("N0"),
            data => data.Price));
        columns.Add(("Size", 1,
            x => () => $"{x.data.Shape.Width}x{x.data.Shape.Height}", 
            data => data.Shape.Width*data.Shape.Height));
        
        var items = (_selling ? _targetCargo : Inventory).Cargo.Keys
            .Select<ItemInstance, (ItemInstance item, ItemData data)>(ii=>(ii, GameManager.ItemManager.GetData(ii)));
        
        if (MinimumSizeFilter.gameObject.activeSelf)
            items = items.Where(i =>
                !(MinimumSizeFilter.Width.text.Length > 0 && i.data.Shape.Width < int.Parse(MinimumSizeFilter.Width.text) ||
                 MinimumSizeFilter.Height.text.Length > 0 && i.data.Shape.Height < int.Parse(MinimumSizeFilter.Height.text)));
        
        if (MaximumSizeFilter.gameObject.activeSelf)
            items = items.Where(i =>
                !(MaximumSizeFilter.Width.text.Length > 0 && i.data.Shape.Width > int.Parse(MaximumSizeFilter.Width.text) ||
                 MaximumSizeFilter.Height.text.Length > 0 && i.data.Shape.Height > int.Parse(MaximumSizeFilter.Height.text)));
        
        if(_commodityFilter.filter != null)
            items = items.Where(i => i.data is SimpleCommodityData s && s.Category == _commodityFilter.type);
        
        if(_compoundCommodityFilter.filter != null)
            items = items.Where(i => i.data is CompoundCommodityData c && c.Category == _compoundCommodityFilter.type);
        
        if (_hardpointFilter.filter != null)
            items = items.Where(i => i.data is EquippableItemData e && e.HardpointType == _hardpointFilter.type);
        
        foreach (var (_, type) in _behaviorFilters)
        {
            items = items.Where(i => i.data is EquippableItemData e && e.Behaviors.Any(b => type.IsInstanceOfType(b)));
            
			foreach (var field in type.GetFields().Where(f => f.GetCustomAttribute<RuntimeInspectable>() != null))
			{
				var fieldType = field.FieldType;
				if (fieldType == typeof(float))
                    columns.Add((field.Name, 1, x =>
                    {
                        var behavior = ((EquippableItemData) x.data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return () => ActionGameManager.PlayerSettings.Format((float) field.GetValue(behavior));
                    }, data =>
                    {
                        var behavior = ((EquippableItemData) data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return (float) field.GetValue(behavior);
                    }));
				else if (fieldType == typeof(int))
                    columns.Add((field.Name, 1, x =>
                    {
                        var behavior = ((EquippableItemData) x.data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return () => ((int) field.GetValue(behavior)).ToString();
                    }, data =>
                    {
                        var behavior = ((EquippableItemData) data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return (int) field.GetValue(behavior);
                    }));
				else if (fieldType == typeof(PerformanceStat))
				{
                    columns.Add((field.Name, 1, x =>
                    {
                        var behavior = ((EquippableItemData) x.data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return () => ActionGameManager.PlayerSettings.Format(((PerformanceStat) field.GetValue(behavior)).Max);
                    }, data =>
                    {
                        var behavior = ((EquippableItemData) data).Behaviors.FirstOrDefault(b => type.IsInstanceOfType(b));
                        return ((PerformanceStat) field.GetValue(behavior)).Max;
                    }));
				}
			}
        }
        
        columns.Add(("Owned", 1,
            x => () =>
            {
                if (x.data is HullData)
                    return GameManager.DockedEntity.Children.Count(s => s.Hull.Data.Key.Equals(GameManager.ItemManager.ItemData.RefOf(x.data).Key) && s is Ship {IsPlayerShip: true}).ToString();
                if(x.data is SimpleCommodityData)
                    return (_targetCargo.ItemsOfType.ContainsKey(GameManager.ItemManager.ItemData.RefOf(x.data).Key) ? _targetCargo.ItemsOfType[GameManager.ItemManager.ItemData.RefOf(x.data).Key].Cast<SimpleCommodity>().Sum(s=>s.Quantity) : 0).ToString();
                return (_targetCargo.ItemsOfType.ContainsKey(GameManager.ItemManager.ItemData.RefOf(x.data).Key) ? _targetCargo.ItemsOfType[GameManager.ItemManager.ItemData.RefOf(x.data).Key].Count : 0).ToString();
            }, 
            data =>
            {
                if (data is HullData)
                    return GameManager.DockedEntity.Children.Count(s => s.Hull.Data.Key.Equals(GameManager.ItemManager.ItemData.RefOf(data).Key) && s is Ship {IsPlayerShip: true});
                if(data is SimpleCommodityData)
                    return _targetCargo.ItemsOfType.ContainsKey(GameManager.ItemManager.ItemData.RefOf(data).Key) ? _targetCargo.ItemsOfType[GameManager.ItemManager.ItemData.RefOf(data).Key].Cast<SimpleCommodity>().Sum(s=>s.Quantity) : 0;
                return _targetCargo.ItemsOfType.ContainsKey(GameManager.ItemManager.ItemData.RefOf(data).Key) ? _targetCargo.ItemsOfType[GameManager.ItemManager.ItemData.RefOf(data).Key].Count : 0;
            }));
        
        Spreadsheet.ShowData(
            columns.Select(x => x.name).ToArray(),
            columns.Select(x => x.size).ToArray(),
            items.Select(i => new SpreadsheetEntryRow
            {
                Columns = columns.Select(x => new SpreadsheetEntryColumn
                {
                    Output = x.output(i),
                    SortKey = x.sortKey(i.data)
                }).ToArray(),
                OnClick = () => Properties.Inspect(i.item),
                OnDoubleClick = () =>
                {
                    if (_selling) return;
                    switch (i.item)
                    {
                        case CraftedItemInstance c:
                            Buy(c);
                            break;
                        case SimpleCommodity s:
                            Buy(s, 1);
                            break;
                    }

                    Populate();
                },
                OnRightClick = () =>
                {
                    if (_selling)
                    {
                        ContextMenu.Clear();
                        ContextMenu.AddOption($"Sell ({StationServices.SellPrice(GameManager.ItemManager, i.item):N0})", () => Sell(i.item));
                        ContextMenu.Show();
                    }
                    else if (i.item is SimpleCommodity s)
                    {
                        ContextMenu.Clear();
                        ContextMenu.AddOption("Buy Quantity",
                            () =>
                            {
                                int quantity = 1;
                                Dialog.Clear();
                                Dialog.Title.text = $"Buying {i.data.Name}";
                                Dialog.AddField("Quantity", 
                                    () => quantity, 
                                    q => quantity = min(min(q, GameManager.Credits / i.data.Price), s.Quantity));
                                Dialog.Show(() =>
                                {
                                    Buy(s,quantity);

                                    Populate();
                                });
                                Dialog.MoveToCursor();
                            });
                        ContextMenu.Show();
                    }
                }
            }));
    }
    
    private void UpdateCreditsLabel()
    {
        if (CreditsLabel != null)
        {
            CreditsLabel.text = GameManager.Credits.ToString("N0");
        }
    }

    private void Sell(ItemInstance item)
    {
        if (StationServices.TrySell(_targetCargo, GameManager.DockedEntity, item, ref GameManager.Credits))
        {
            UpdateCreditsLabel();
            Populate();
            return;
        }
        Dialog.Clear();
        Dialog.Title.text = "Unable to sell: Station Cargo Full!";
        Dialog.Show();
        Dialog.MoveToCursor();
    }

    private void Repair()
    {
        if (StationServices.TryRepair(GameManager.CurrentEntity, ref GameManager.Credits))
        {
            UpdateCreditsLabel();
            return;
        }
        Dialog.Clear();
        Dialog.Title.text = "Unable to repair: Insufficient Credits!";
        Dialog.Show();
        Dialog.MoveToCursor();
    }

    private void Buy(CraftedItemInstance item)
    {
        var data = GameManager.ItemManager.GetData(item);
        var price = GameManager.ItemManager.GetPrice(item);
        if (price < GameManager.Credits)
        {
            if (data is HullData hullData)
            {
                if (hullData.HullType != HullType.Ship) throw new ArgumentException("Attempted to buy non-ship hull from station, WTF are you doing?!");

                GameManager.CommissionShip(item as EquippableItem);

                GameManager.Credits -= price;
                UpdateCreditsLabel();
            }
            else if (Inventory.TryTransferItem(_targetCargo, item))
            {
                GameManager.Credits -= price;
                UpdateCreditsLabel();
            }
            else
            {
                Dialog.Clear();
                Dialog.Title.text = "Unable to buy: Insufficient Cargo Space!";
                Dialog.Show();
                Dialog.MoveToCursor();
                return;
            }
        }
        else
        {
            Dialog.Clear();
            Dialog.Title.text = "Unable to buy: Insufficient Credits!";
            Dialog.Show();
            Dialog.MoveToCursor();
            return;
        }
    }

    private void Buy(SimpleCommodity simpleCommodity, int quantity)
    {
        var data = GameManager.ItemManager.GetData(simpleCommodity);
        // Up-rounded integer division from https://stackoverflow.com/a/503201
        int lots = (quantity - 1) / data.MaxStack + 1;
        int remaining = quantity;
        for (int i = 0; i < lots; i++)
        {
            int q = min(remaining, data.MaxStack);
            if (q * data.Price < GameManager.Credits)
            {
                if (Inventory.TryTransferItem(_targetCargo, simpleCommodity, quantity))
                {
                    GameManager.Credits -= q * data.Price;
                    UpdateCreditsLabel();
                    remaining -= q;
                }
                else
                {
                    Dialog.Clear();
                    Dialog.Title.text = "Unable to buy: Insufficient Cargo Space!";
                    Dialog.Show();
                    Dialog.MoveToCursor();
                    return;
                }
            }
            else
            {
                Dialog.Clear();
                Dialog.Title.text = "Unable to buy: Insufficient Credits!";
                Dialog.Show();
                Dialog.MoveToCursor();
                return;
            }

            
        }
    }

    void Start()
    {
        FoldoutButton.onClick.AddListener(() =>
        {
            ContextMenu.Clear();
            if(_targetCargo != GameManager.DockingBay)
                ContextMenu.AddOption("Docking Bay",
                    () =>
                    {
                        _targetCargo = GameManager.DockingBay;
                        TargetCargoLabel.text = "Docking Bay";
                    });
            foreach (var ship in GameManager.CurrentEntity.Parent.Children.Where(e => e is Ship {IsPlayerShip: true}))
            {
                foreach (var bay in ship.CargoBays.Select((bay, index) => (bay, index)))
                {
                    if(_targetCargo != bay.bay)
                    {
                        ContextMenu.AddOption($"{ship.Name} Bay {bay.index+1}",
                            () =>
                            {
                                _targetCargo = bay.bay;
                                TargetCargoLabel.text = $"{ship.Name} Bay {bay.index+1}";
                            });
                    }
                }
            }
            ContextMenu.AddOption(_selling ? "Buy Goods" : "Sell Goods", () =>
            {
                _selling = !_selling;
                Populate();
            });
            var repairCost = StationServices.RepairCost(GameManager.ItemManager, GameManager.CurrentEntity);
            if (repairCost > 0) ContextMenu.AddOption($"Repair ({repairCost:N0})", Repair);
            ContextMenu.Show();
        });
    }

    void Update()
    {
        
    }
}