using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace YKMoon.Procedure
{
    public class RuntimeProcRunner
    {
        private Queue<ARuntimeProc> requests = new Queue<ARuntimeProc>();
        public bool isRunning => requests.Count > 0;
        public int requestCount => requests.Count;
        public System.Action<ARuntimeProc> onNext;
        public System.Action onComplete;
        public void Update(float deltaTime)
        {
            while(requests.Count > 0) {
                var top = requests.Peek();
                if(!IsTopFinished(top, deltaTime)) {
                    break;
                }
                if(requests.Count > 0) {
                    requests.Dequeue();
                    if(requests.Count == 0) {
                        onComplete?.Invoke();
                    }
                }
            }
        }

        private bool IsTopFinished(ARuntimeProc proc, float deltaTime)
        {
            proc.Update(deltaTime);
            if(!proc.isRunning) {
                proc.Start();
                onNext?.Invoke(proc);
            }            
            return proc.isFinished;
        }
        public void AddProc(ARuntimeProc proc)
        {
            requests.Enqueue(proc);
        }
        public void Clear()
        {
            onComplete = null;
            requests.Clear();
        }

        public Queue<ARuntimeProc> GetRequests()
        {
            return requests;
        }
    }
}