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

namespace WorldStreamer2
{
    public class PlayerMover : MonoBehaviour
    {
        /// <summary>
        /// The streamers.
        /// </summary>
        [Tooltip("List of streamers objects that should affect loading screen. Drag and drop here all your streamer objects from scene hierarchy which should be used in loading screen.")]
        public Streamer[] streamers;

        /// <summary>
        /// The player transform.
        /// </summary>
        [Space(10)] [Tooltip("Drag and drop here, an object that system have to follow during streaming process.")]
        public Transform player;

        /// <summary>
        /// The player safe position during loading.
        /// </summary>
        [Tooltip("The player safe position during loading.")]
        public Transform safePosition;

        [Space(10)] public UnityEvent onDone;

        private GameObject temporaryObject;

        private float progress = 0;

        private bool waitForPlayer = false;
        private bool playerMoved = false;

        /// <summary>
        /// Awake this instance.
        /// </summary>
        void Awake()
        {
            if (streamers.Length > 0)
            {
                if (streamers[0].spawnedPlayer == false)
                {
                    MovePlayer();
                }
                else
                {
                    waitForPlayer = true;
                }
            }
        }


        /// <summary>
        /// Update this instance, and sets current progress of streaming.
        /// </summary>
        void Update()
        {
            if (waitForPlayer)
            {
                if (player == null && !string.IsNullOrEmpty(streamers[0].playerTag))
                {
                    GameObject playerGo = GameObject.FindGameObjectWithTag(streamers[0].playerTag);
                    if (playerGo != null)
                    {
                        player = playerGo.transform;
                        MovePlayer();
                        waitForPlayer = false;
                    }
                }
            }
            else
            {
                if (!playerMoved)
                {
                    if (streamers.Length > 0)
                    {
                        bool initialized = true;

                        progress = 0;
                        foreach (var item in streamers)
                        {
                            progress += item.LoadingProgress / (float) streamers.Length;
                            initialized = initialized && item.initialized;
                        }

                        if (initialized)
                        {
                            if (progress >= 1)
                            {
                                if (onDone != null)
                                    onDone.Invoke();
                                Done();
                            }
                        }
                    }
                    else
                        Debug.Log("No streamer Attached");
                }
            }
        }

        public void Done()
        {
            player.position = temporaryObject.transform.position;
            player.rotation = temporaryObject.transform.rotation;

            foreach (var item in streamers)
            {
                item.player = player;
            }

            Destroy(temporaryObject);
            playerMoved = true;
            gameObject.SetActive(false);
        }

        /// <summary>
        /// Moves player for loading;
        /// </summary>
        public void MovePlayer()
        {
            temporaryObject = new GameObject("Temporary");
            temporaryObject.transform.position = player.position;
            temporaryObject.transform.rotation = player.rotation;
            foreach (var item in streamers)
            {
                item.player = temporaryObject.transform;
            }

            Debug.Log(safePosition.position);
            player.position = safePosition.position;
            player.rotation = safePosition.rotation;

            gameObject.SetActive(true);
            playerMoved = false;
        }
    }
}