using System;
using System.Collections.Generic;
using Cysharp.Threading.Tasks;
using UnityEngine;

namespace Code.Infrastructure.EventBus
{
    public class EventBus
    {
        private Dictionary<Type, SubscribersList<IGlobalSubscriber>> s_Subscribers
            = new();
        
        public void Subscribe(IGlobalSubscriber subscriber)
        {
            List<Type> subscriberTypes = EventBusHelper.GetSubscriberTypes(subscriber);
            foreach (Type t in subscriberTypes)
            {
                if (!s_Subscribers.ContainsKey(t))
                {
                    s_Subscribers[t] = new SubscribersList<IGlobalSubscriber>();
                }
                s_Subscribers[t].Add(subscriber);
            }
        }
        
        public void Unsubscribe(IGlobalSubscriber subscriber)
        {
            List<Type> subscriberTypes = EventBusHelper.GetSubscriberTypes(subscriber);
            foreach (Type t in subscriberTypes)
            {
                if (s_Subscribers.ContainsKey(t))
                    s_Subscribers[t].Remove(subscriber);
            }
        }
        
        public void RaiseEvent<TSubscriber>(Action<TSubscriber> action)
            where TSubscriber : class, IGlobalSubscriber
        {
            if (!s_Subscribers.ContainsKey(typeof(TSubscriber))) return;
            
            SubscribersList<IGlobalSubscriber> subscribers = s_Subscribers[typeof(TSubscriber)];

            subscribers.Executing = true;
            
            InvokeSubscribers(action, subscribers);

            subscribers.Executing = false;
            subscribers.Cleanup();
        }

        private void InvokeSubscribers<TSubscriber>(Action<TSubscriber> action, SubscribersList<IGlobalSubscriber> subscribers)
            where TSubscriber : class, IGlobalSubscriber
        {
            for ( int i = 0; i < subscribers.List.Count; i++)
            {
                Debug.Log("Invoking " + typeof(TSubscriber).Name);
                IGlobalSubscriber subscriber = subscribers.List[i];
                try
                {
                    action.Invoke(subscriber as TSubscriber);
                }
                catch (Exception e)
                {
                    Debug.LogError(e);
                }
            }
        }
    }
}