/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using GameCult.Aetheria.State.Unity;
using Unity.Mathematics;
using static Unity.Mathematics.math;
using float2 = Unity.Mathematics.float2;
using Random = Unity.Mathematics.Random;
using JM.LinqFaster;
using UniRx;
using float4 = Unity.Mathematics.float4;

public class ItemManager
{
    public Random Random = new Random((uint) (DateTime.Now.Ticks%uint.MaxValue));
    // public SimpleCommodityData[] Resources;
    // public Dictionary<Guid, List<IController>> CorporationControllers = new Dictionary<Guid, List<IController>>();
    // public Dictionary<Guid, ZoneDefinition> GalaxyZones;
    
    private Action<string> _logger;

    private double _time;
    private float _deltaTime;
    private Dictionary<Guid, Zone> _zones = new Dictionary<Guid, Zone>();

    // private Guid _forceLoadZone;
    
    private readonly IRuntimeItemProjectionReader _itemProjections;
    public GameplaySettings GameplaySettings { get; }

    // public double Time
    // {
    //     get => _time;
    //     set
    //     {
    //         _deltaTime = (float) (value - _time);
    //         _time = value;
    //         //Log($"GameContext delta time: {_deltaTime}");
    //     }
    // }

    // private readonly Dictionary<CraftedItemData, int> Tier = new Dictionary<CraftedItemData, int>();

    public ItemManager(IRuntimeItemProjectionReader itemProjections, GameplaySettings settings, Action<string> logger)
    {
        _itemProjections = itemProjections;
        GameplaySettings = settings;
        _logger = logger;
    }

    public T GetRuntimeItemProjection<T>(Guid id) where T : ItemData
    {
        return _itemProjections.Get<T>(id);
    }

    public AetheriaRuntimeCatalogItem GetRuntimeItem(ItemInstance item)
    {
        var itemId = item?.Data?.ItemId ?? Guid.Empty;
        return GetRuntimeItem(itemId);
    }

    public AetheriaRuntimeCatalogItem GetRuntimeItem(Guid itemId)
    {
        return itemId == Guid.Empty ? null : _itemProjections.GetRuntimeItem(itemId);
    }

    public IReadOnlyList<BehaviorData> GetRuntimeBehaviorProjections(ItemInstance item)
    {
        var itemId = item?.Data?.ItemId ?? Guid.Empty;
        return itemId == Guid.Empty
            ? Array.Empty<BehaviorData>()
            : _itemProjections.GetBehaviorProjections(itemId);
    }

    public Shape GetRuntimeShape(ItemInstance item)
    {
        var typedItem = GetRuntimeItem(item);
        return ToShape(typedItem?.ShapeWidth ?? 1, typedItem?.ShapeHeight ?? 1, typedItem?.ShapeCells);
    }

    private static Shape ToShape(int width, int height, IReadOnlyList<AetheriaRuntimeShapeCell> cells)
    {
        var shape = new Shape(Math.Max(width, 1), Math.Max(height, 1));
        if (cells == null) return shape;

        foreach (var cell in cells)
            shape[new int2(cell.X, cell.Y)] = true;

        return shape;
    }

    public RuntimeItemReference CreateReference(ItemData item)
    {
        return new RuntimeItemReference(item);
    }

    public ItemData GetData(ItemInstance item)
    {
        Hydrate(item);
        return item?.Data?.Projection;
    }

    public void Hydrate(ItemInstance item)
    {
        if (item?.Data == null || item.Data.Projection != null)
        {
            return;
        }

        var data = _itemProjections.Get(item.Data.ItemId);
        if (data == null)
        {
            _logger($"Attempted to hydrate missing item id {item.Data.ItemId}");
            return;
        }

        item.Data.SetProjection(data);
    }

    public void Log(string s)
    {
        _logger(s);
    }

    public SimpleCommodityData GetData(SimpleCommodity item)
    {
        return GetData((ItemInstance)item) as SimpleCommodityData;
    }

    public CraftedItemData GetData(CraftedItemInstance item)
    {
        return GetData((ItemInstance)item) as CraftedItemData;
    }

    public EquippableItemData GetData(EquippableItem item)
    {
        return GetData((ItemInstance)item) as EquippableItemData;
    }

    public float GetMass(ItemInstance item)
    {
        var typedItem = GetRuntimeItem(item);
        if (typedItem == null)
        {
            return 0;
        }

        return item switch
        {
            CraftedItemInstance _ => (float)typedItem.Mass,
            SimpleCommodity commodity => (float)typedItem.Mass * commodity.Quantity,
            _ => 0
        };
    }

    public float GetThermalMass(ItemInstance item)
    {
        var typedItem = GetRuntimeItem(item);
        if (typedItem == null)
        {
            return 0;
        }

        return item switch
        {
            CraftedItemInstance _ => (float)(typedItem.Mass * typedItem.SpecificHeat),
            SimpleCommodity commodity => (float)(typedItem.Mass * typedItem.SpecificHeat * commodity.Quantity),
            _ => 0
        };
    }

    // Returns stat when not equipped
    public float Evaluate(PerformanceStat stat, EquippableItem item)
    {
        var typedItem = GetRuntimeItem(item);
        var maxDurability = (float)(typedItem?.Durability ?? 0);
        if (maxDurability <= 0)
        {
            maxDurability = Math.Max(item.Durability, 1f);
        }

        var quality = pow(item.Quality, stat.QualityExponent);
        var durabilityExponent = lerp(
            GameplaySettings.DurabilityQualityMin,
            GameplaySettings.DurabilityQualityMax,
            pow(item.Quality, GameplaySettings.DurabilityQualityExponent));
        var durability = pow(item.Durability / maxDurability, durabilityExponent * stat.DurabilityExponentMultiplier);
        var result = lerp(stat.Min, stat.Max, quality * durability);
        if (float.IsNaN(result)) 
            throw new InvalidOperationException($"Performance Stat on {typedItem?.Name ?? item.Data?.ItemId.ToString() ?? "unknown item"} evaluating as NaN: input data is invalid! Durability: {item.Durability} / {maxDurability}");
        return result;

    }

    public int GetPrice(CraftedItemInstance item)
    {
        var typedItem = GetRuntimeItem(item);
        return typedItem == null
            ? 0
            : (int) (GameplaySettings.QualityPriceModifier.Evaluate(item.Quality) * typedItem.Price);
    }

    public int GetPrice(ItemInstance item)
    {
        var typedItem = GetRuntimeItem(item);
        if (typedItem == null)
        {
            return 0;
        }

        return item switch
        {
            CraftedItemInstance crafted => (int)(GameplaySettings.QualityPriceModifier.Evaluate(crafted.Quality) * typedItem.Price),
            SimpleCommodity commodity => typedItem.Price * commodity.Quantity,
            _ => typedItem.Price
        };
    }

    public SimpleCommodity CreateInstance(SimpleCommodityData item, int count)
    {
        if (item != null)
        {
            var newItem = new SimpleCommodity
            {
                Data = CreateReference(item),
                Quantity = count
            };
            //ItemData.Add(newItem);
            return newItem;
        }
        
        _logger("Attempted to create Simple Commodity instance using missing or incorrect item id");
        return null;
    }

    public ItemInstance Instantiate(ItemInstance item)
    {
        var data = GetData(item);
        if(data is CraftedItemData c)
        {
            var i = CreateInstance(c);
            i.Rotation = item.Rotation;
            return i;
        }
        if (item is SimpleCommodity s)
        {
            var i = CreateInstance(data as SimpleCommodityData, s.Quantity);
            i.Rotation = item.Rotation;
            return i;
        }
        return null;
    }

    public CraftedItemInstance CreateInstance(CraftedItemData item, float quality)
    {
        if (item is EquippableItemData equippableItemData)
        {
            return new EquippableItem
            {
                Data = CreateReference(item), Quality = quality, Durability = GetInitialDurability(equippableItemData)
            };
        }

        var newCommodity = new CompoundCommodity
        {
            Data = CreateReference(item),
            Quality = quality
        };
        return newCommodity;
    }

    private float GetInitialDurability(EquippableItemData item)
    {
        var typedItem = GetRuntimeItem(item.ID);
        return typedItem?.Durability > 0 ? (float)typedItem.Durability : item.Durability;
    }
    
    public CraftedItemInstance CreateInstance(CraftedItemData item)
    {
        if (item == null)
        {
            throw new NullReferenceException("Attempted to create crafted item instance using missing or incorrect item data!");
            return null;
        }

        var quality = Random.NextFloat();
        var tier = GameplaySettings.Tiers[0];
        foreach (var t in GameplaySettings.Tiers)
        {
            if (t.Rarity > quality)
                tier = t;
        }

        return CreateInstance(item, tier.Quality);
    }

    public (RarityTier tier, int upgrades) GetTier(CraftedItemInstance item)
    {
        var tier = GameplaySettings.Tiers[0];
        foreach (var t in GameplaySettings.Tiers)
            if (item.Quality + .001f > t.Quality)
                tier = t;
        int upgrades = (int) ((item.Quality - tier.Quality) / .0499f);
        return (tier, upgrades);
    }
}