/*
 * Copyright (C) 2012-2020 CypherCore <http://github.com/CypherCore>
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

using Framework.Constants;
using Framework.Database;
using Game.DataStorage;
using System.Collections.Generic;

namespace Game.Entities
{
    public class ItemEnchantmentManager
    {
        public static void LoadItemRandomBonusListTemplates()
        {
            uint oldMSTime = Time.GetMSTime();

            _storage.Clear();

            //                                         0   1            2
            SQLResult result = DB.World.Query("SELECT Id, BonusListID, Chance FROM item_random_bonus_list_template");

            if (result.IsEmpty())
            {
                Log.outInfo(LogFilter.Player, "Loaded 0 Item Enchantment definitions. DB table `item_enchantment_template` is empty.");
                return;
            }
            uint count = 0;

            do
            {
                uint id = result.Read<uint>(0);
                uint bonusListId = result.Read<uint>(1);
                float chance = result.Read<float>(2);

                if (Global.DB2Mgr.GetItemBonusList(bonusListId) == null)
                {
                    Log.outError(LogFilter.Sql, $"Bonus list {bonusListId} used in `item_random_bonus_list_template` by id {id} doesn't have exist in ItemBonus.db2");
                    continue;
                }

                if (chance < 0.000001f || chance > 100.0f)
                {
                    Log.outError(LogFilter.Sql, $"Bonus list {bonusListId} used in `item_random_bonus_list_template` by id {id} has invalid chance {chance}");
                    continue;
                }

                if (!_storage.ContainsKey(id))
                    _storage[id] = new RandomBonusListIds();

                RandomBonusListIds ids = _storage[id];
                ids.BonusListIDs.Add(bonusListId);
                ids.Chances.Add(chance);

                ++count;
            } while (result.NextRow());

            Log.outInfo(LogFilter.Player, $"Loaded {count} Random item bonus list definitions in {Time.GetMSTimeDiffToNow(oldMSTime)} ms");
        }

        public static uint GenerateItemRandomBonusListId(uint item_id)
        {
            ItemTemplate itemProto = Global.ObjectMgr.GetItemTemplate(item_id);
            if (itemProto == null)
                return 0;

            // item must have one from this field values not null if it can have random enchantments
            if (itemProto.RandomBonusListTemplateId == 0)
                return 0;

            var tab = _storage.LookupByKey(itemProto.RandomBonusListTemplateId);
            if (tab == null)
            {
                Log.outError(LogFilter.Sql, $"Item RandomBonusListTemplateId id {itemProto.RandomBonusListTemplateId} used in `item_template_addon` but it does not have records in `item_random_bonus_list_template` table.");
                return 0;
            }
            //todo fix me this is ulgy
            return tab.BonusListIDs.SelectRandomElementByWeight(x => (float)tab.Chances[tab.BonusListIDs.IndexOf(x)]);
        }

        public static float GetRandomPropertyPoints(uint itemLevel, ItemQuality quality, InventoryType inventoryType, uint subClass)
        {
            uint propIndex;

            switch (inventoryType)
            {
                case InventoryType.Head:
                case InventoryType.Body:
                case InventoryType.Chest:
                case InventoryType.Legs:
                case InventoryType.Ranged:
                case InventoryType.Weapon2Hand:
                case InventoryType.Robe:
                case InventoryType.Thrown:
                    propIndex = 0;
                    break;
                case InventoryType.RangedRight:
                    if ((ItemSubClassWeapon)subClass == ItemSubClassWeapon.Wand)
                        propIndex = 3;
                    else
                        propIndex = 0;
                    break;
                case InventoryType.Weapon:
                case InventoryType.WeaponMainhand:
                case InventoryType.WeaponOffhand:
                    propIndex = 3;
                    break;
                case InventoryType.Shoulders:
                case InventoryType.Waist:
                case InventoryType.Feet:
                case InventoryType.Hands:
                case InventoryType.Trinket:
                    propIndex = 1;
                    break;
                case InventoryType.Neck:
                case InventoryType.Wrists:
                case InventoryType.Finger:
                case InventoryType.Shield:
                case InventoryType.Cloak:
                case InventoryType.Holdable:
                    propIndex = 2;
                    break;
                case InventoryType.Relic:
                    propIndex = 4;
                    break;
                default:
                    return 0;
            }

            RandPropPointsRecord randPropPointsEntry = CliDB.RandPropPointsStorage.LookupByKey(itemLevel);
            if (randPropPointsEntry == null)
                return 0;

            switch (quality)
            {
                case ItemQuality.Uncommon:
                    return randPropPointsEntry.GoodF[propIndex];
                case ItemQuality.Rare:
                case ItemQuality.Heirloom:
                    return randPropPointsEntry.SuperiorF[propIndex];
                case ItemQuality.Epic:
                case ItemQuality.Legendary:
                case ItemQuality.Artifact:
                    return randPropPointsEntry.EpicF[propIndex];
            }

            return 0;
        }

        static Dictionary<uint, RandomBonusListIds> _storage = new();
    }

    public class RandomBonusListIds
    {
        public List<uint> BonusListIDs = new();
        public List<double> Chances = new();
    }
}