using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using UnityEngine;

namespace Client.Game.Abilities.Utils
{
    public class ActionSequence : List<ActionElement>
    {

        public float accum = 0f;
        public int index = -1;

        public float TotalTime {
            get {
                var ret = 0f;
                foreach (var element in this)
                    ret += element.Duration;

                return ret;
            }
        }

        public void Insert(ActionElement element)
        {
            element.Timestamp = TotalTime;
            this.Add(element);
        }

        public void Insert(Action action, float duration = 0f)
        {
            Insert(new ActionElement(action, duration));
        }

        internal void InsertContinuous(Action action, float duration)
        {
            Insert(new ActionElement(action, duration, true));
        }

        private int IndexAtTime(float time)
        {
            int i = 0;
            var iat = i;
            for(; i<this.Count; i++)
            {
                if (this[i].Timestamp <= time)
                    iat = i;
                else
                    return iat;
            }
            return iat;
        }

        internal void InsertWait(float time)
        {
            Insert(() => { }, time);
        }

        public void Update(float dt)
        {
            accum += dt;
            var newIndex = IndexAtTime(accum);
            for( var i = index; i<= newIndex; i++)
            {
                if(i > index)
                {
                    index = i;
                    //Debug.Log("Invoking action index " + i + " at time: " + accum);
                    this[i].Action();
                    return;
                }
            }
            var current = this[newIndex];
            if(current.Continuous)
            {
                current.Action();
            }

        }

        public void Log()
        {
            var str = new StringBuilder();
            foreach( var action in this)
            {
                str.AppendFormat("{0}:{1}\n", action.Timestamp, action.Action);
            }

            Debug.Log(str.ToString());
        }
    }

    public class ActionElement
    {
        public float Duration;
        public Action Action;
        public bool Continuous;
        public float Timestamp;
        public ActionElement(Action action, float duration, bool callContinuously = false)
        {
            this.Duration = duration;
            this.Action = action;
            this.Continuous = callContinuously;
        }
    }
}