//------------------------------------------------------------
// Game Framework
// Copyright © 2013-2021 Jiang Yin. All rights reserved.
// Homepage: https://gameframework.cn/
// Feedback: mailto:ellan@gameframework.cn
//------------------------------------------------------------

using System;
using System.Collections.Generic;
using Definition;
using Entity.EntityData;
using UnityGameFramework.Runtime;
using DataTable;
using Definition.Enum;
using Game.Utility;

namespace Entity
{
    public static class EntityExtension
    {
        // 关于 EntityId 的约定：
        // 0 为无效
        // 正值用于和服务器通信的实体（如玩家角色、NPC、怪等，服务器只产生正值）
        // 负值用于本地生成的临时实体（如特效、FakeObject等）
        private static int s_SerialId = -10;

        private const string EntityNamespace = "Entity.";
        private static Dictionary<string, Type> _typeDict;

        static EntityExtension()
        {
            _typeDict = new Dictionary<string, Type>();
        }

        public static EntityBase GetGameEntity(this EntityComponent entityComponent, int entityId)
        {
            UnityGameFramework.Runtime.Entity entity = entityComponent.GetEntity(entityId);
            if (entity == null)
            {
                return null;
            }

            return (EntityBase)entity.Logic;
        }

        public static void HideEntity(this EntityComponent entityComponent, EntityBase entity)
        {
            entityComponent.HideEntity(entity.Entity);
        }

        public static void AttachEntity(this EntityComponent entityComponent, EntityBase entityBase, int ownerId,
            string parentTransformPath = null, object userData = null)
        {
            entityComponent.AttachEntity(entityBase.Entity, ownerId, parentTransformPath, userData);
        }

        public static void ShowPlayer(this EntityComponent entityComponent, PlayerData data)
        {
            entityComponent.ShowEntity(typeof(Player), "Player", Constant.AssetPriority.PlayerAsset, data);
        }

        public static void ShowEnemy(this EntityComponent entityComponent, EnemyData data)
        {
            string typeName = EntityNamespace + (EnemyType)data.TypeId;
            if (!_typeDict.TryGetValue(typeName, out Type enemyType))
            {
                enemyType = Type.GetType(typeName);
                if (enemyType == null)
                {
                    Log.Warning("Can not load entity type '{0}'.", typeName);
                    return;
                }

                _typeDict.Add(typeName, enemyType);
            }

            entityComponent.ShowEntity(enemyType, "Enemy", Constant.AssetPriority.EnemyAsset, data);
        }

        public static void ShowWeapon(this EntityComponent entityComponent, WeaponData data)
        {
            string typeName = EntityNamespace + (WeaponType)data.TypeId;
            if (!_typeDict.TryGetValue(typeName, out Type weaponType))
            {
                weaponType = Type.GetType(typeName);
                if (weaponType == null)
                {
                    Log.Warning("Can not load entity type '{0}'.", typeName);
                    return;
                }

                _typeDict.Add(typeName, weaponType);
            }

            entityComponent.ShowEntity(weaponType, "Weapon", Constant.AssetPriority.WeaponAsset, data);
        }

        public static void ShowBullet(this EntityComponent entityComponent, BulletData data)
        {
            entityComponent.ShowEntity(typeof(Bullet), "Bullet", Constant.AssetPriority.BulletAsset, data);
        }

        public static void ShowEffect(this EntityComponent entityComponent, EffectData data)
        {
            entityComponent.ShowEntity(typeof(Effect), "Effect", Constant.AssetPriority.EffectAsset, data);
        }

        public static void ShowCoin(this EntityComponent entityComponent, CoinData data)
        {
            entityComponent.ShowEntity(typeof(CoinEntity), "Drop", Constant.AssetPriority.EffectAsset, data);
        }

        public static void ShowExp(this EntityComponent entityComponent, ExpData data)
        {
            entityComponent.ShowEntity(typeof(ExpEntity), "Drop", Constant.AssetPriority.EffectAsset, data);
        }

        private static void ShowEntity(this EntityComponent entityComponent, Type logicType, string entityGroup,
            int priority, EntityDataBase data)
        {
            if (data == null)
            {
                Log.Warning("Data is invalid.");
                return;
            }

            DREntity drEntity = GameEntry.DataTable.GetDataTableRow<DREntity>(data.TypeId);
            if (drEntity == null)
            {
                Log.Warning("Can not load entity id '{0}' from data table.", data.TypeId.ToString());
                return;
            }

            entityComponent.ShowEntity(data.Id, logicType, AssetUtility.GetEntityAsset(drEntity.AssetName), entityGroup,
                priority, data);
        }

        public static int GenerateSerialId(this EntityComponent entityComponent)
        {
            return --s_SerialId;
        }
    }
}