using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Sirenix.OdinInspector;
using UniRx;

namespace KairoEngine.Stats
{
    [System.Serializable]
    public class StatusEffectsController
    {
        [System.NonSerialized] public StatsController controller;

        public void SetStatsController(StatsController controller) => this.controller = controller;
        
        [ListDrawerSettings(HideAddButton = true, HideRemoveButton = true, DraggableItems = false, Expanded = true, ShowPaging = false, ShowItemCount = false)]
        public List<StatusEffect> statusEffects = new List<StatusEffect>();

        /// <summary>The target Transform to pass on to the GameActionsContext for doing things like spawning particles.</summary>
        [HideInInspector] public Transform target;

        public StatusEffectsController(StatsController controller,  List<StatusEffect> statusEffects = null)
        {
            this.controller = controller;
            if(statusEffects == null) statusEffects = new List<StatusEffect>();
            this.statusEffects = statusEffects;
        }

        #region DatabaseOperations

        public void Add(StatusEffectTemplate statusEffectTemplate, Transform source)
        {
            if(statusEffectTemplate == null)
            {
                Debug.LogError("statusEffect cannot be null");
                return;
            }
            StatusEffect statusEffect = GetStatusEffect(statusEffectTemplate.title);
            if(statusEffect == null) 
            {
                if(this.controller == null) Debug.LogError("Missing statsController");
                statusEffect = new StatusEffect(statusEffectTemplate, target, source, this.controller);
                statusEffects.Add(statusEffect);
            }
            else
            {
                if(statusEffect.template.maxStack > statusEffect.stack)
                {
                    statusEffect.AddToStack();
                }
                else { } // The statusEffect is already added and cannot be stacked 
             }
        }

        public StatusEffect GetStatusEffect(string title)
        {
            for (int i = 0; i < statusEffects.Count; i++)
            {
                if(statusEffects[i].template.title == title) return statusEffects[i];
            }
            return null;
        }

        public void Remove(StatusEffect statusEffect)
        {
            statusEffect.OnRemove();
            statusEffects.Remove(statusEffect);
        }

        #endregion

        #region Flow

        private CompositeDisposable cancel;

        /// <summary>Let the StatusController flow in time</summary>
        public void Start()
        {
            var observable = Observable.EveryUpdate();
            cancel = new CompositeDisposable();
            observable.Subscribe(xs => UpdateStatusEffects()).AddTo(cancel);
        }

        /// <summary>Stop this controller.</summary>
        public void Stop()
        {
            if(cancel != null) cancel.Dispose();
        }

        private void UpdateStatusEffects()
        {
            for (int i = 0; i < statusEffects.Count; i++) 
            {
                statusEffects[i].Update(Time.deltaTime);
            }
            for (int i = 0; i < statusEffects.Count; i++) 
            {
                if(statusEffects[i].stack == 0)
                {
                    statusEffects.RemoveAt(i);
                    return;
                }
            }
        }

        #endregion
    }
}