using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using ObjectScripts;
namespace UIScripts
{
    public class Timeline : MonoBehaviour
    {
        ///<summary>
        /// Manager to control and get GameTimestamp
        ///</summary>
        [SerializeField] AbstractManager ManagerObject;
        ///<summary>
        /// Timeline slider
        ///</summary>
        [SerializeField] UnityEngine.UI.Slider GameTimelineSlider;
        ///<summary>
        /// Text for showing current and newest timestamp
        ///</summary>
        [SerializeField] UnityEngine.UI.Text TimestampText;
        ///<summary>
        /// Start of time interval
        ///</summary>
        private double StartChunk;
        ///<summary>
        /// End of time interval
        ///</summary>
        private double EndChunk;
        ///<summary>
        ///  
        ///</summary>
        private bool Dragging = false;
        ///<summary>
        /// Current Gametimestamp
        ///</summary>
        private float Gametimestamp = 0;
        ///<summary>
        /// Current newest timestamp
        ///</summary>
        private float NewestTimestamp;
        ///<summary>
        /// Manager UpdateRate
        ///</summary>
        private float UpdateRate;

        void Start()
        {
            UpdateRate = ManagerObject.UpdateRateInSeconds;
            StartCoroutine(ChangeSlider());
        }

        ///<summary>
        /// set slider values each 1/updaterate seconds
        ///</summary>
        private IEnumerator ChangeSlider()
        {
            while (true)
            {
                StartChunk = ManagerObject.startChunk;
                EndChunk = ManagerObject.endChunk;
                Gametimestamp = (float)ManagerObject.GameTimestamp;
                NewestTimestamp = (float)ManagerObject.NewestTimestamp;
                if (!Dragging)
                {
                    float minTimeStamp = double.IsNaN(StartChunk) ? (float)ManagerObject.EarliestTimestamp : (float)StartChunk;
                    float maxTimeStamp = double.IsNaN(EndChunk) ? (float)ManagerObject.NewestTimestamp : (float)EndChunk;
                    GameTimelineSlider.maxValue = maxTimeStamp;
                    GameTimelineSlider.minValue = minTimeStamp;

                    GameTimelineSlider.SetValueWithoutNotify(Gametimestamp);
                }
                TimestampText.text = Gametimestamp.ToString("0.00") + " : " + NewestTimestamp.ToString("0.00");
                yield return new WaitForSecondsRealtime(UpdateRate);
            }

        }

        ///<summary>
        /// On dragging slider
        ///</summary>
        public void BeginDrag()
        {
            Dragging = true;
        }
        ///<summary>
        /// on slider value change
        ///</summary>
        public void TimelineValueChanged()
        {
            if (!Dragging)
            {
                ManagerObject.JumpToTimestamp(GameTimelineSlider.value);
            }
        }
        ///<summary>
        /// on stop dragging slider
        ///</summary>
        public void StopDrag()
        {
            GameTimelineSlider.SetValueWithoutNotify(GameTimelineSlider.value);
            ManagerObject.JumpToTimestamp(GameTimelineSlider.value);
            Dragging = false;
        }


    }
}