using System;
using DanielLochner.Assets.SimpleScrollSnap;
using UnityEngine;
using UnityEngine.UI;

namespace Beyond
{
    public class ItemSwapper : MonoBehaviour
    {
        #region Fields

        [SerializeField]
        protected GameObject m_panel, m_toggle;

        private float m_toggleWidth;
        private SimpleScrollSnap m_sss;

        #endregion Fields

        #region Methods

        private void Awake()
        {
            m_sss = gameObject.FindComponentDownHierarchy<SimpleScrollSnap>();
            if (m_toggle)
                m_toggleWidth = m_toggle.GetComponent<RectTransform>().sizeDelta.x * (Screen.width / 2048f); ;
        }

        private void Start()
        {
            for (int i = 0; i < 5; i++)
                AddToBack();
        }

        public void AddToFront()
        {
            Add(0);
        }

        public void AddToBack()
        {
            Add(m_sss.NumberOfPanels);
        }

        private void Add(int index)
        {
            //Pagination
            Instantiate(m_toggle, m_sss.pagination.transform.position + new Vector3(m_toggleWidth * (m_sss.NumberOfPanels + 1), 0, 0), Quaternion.identity, m_sss.pagination.transform);
            m_sss.pagination.transform.position -= new Vector3(m_toggleWidth / 2f, 0, 0);

            //Panel
            m_panel.GetComponent<Image>().color = new Color(UnityEngine.Random.Range(0, 255) / 255f, UnityEngine.Random.Range(0, 255) / 255f, UnityEngine.Random.Range(0, 255) / 255f);
            m_sss.Add(m_panel, index);
        }

        public void RemoveFromFront()
        {
            Remove(0);
        }

        public void RemoveFromBack()
        {
            if (m_sss.NumberOfPanels > 0)
            {
                Remove(m_sss.NumberOfPanels - 1);
            }
            else
            {
                Remove(0);
            }
        }

        private void Remove(int index)
        {
            if (m_sss.NumberOfPanels > 0)
            {
                //Pagination
                DestroyImmediate(m_sss.pagination.transform.GetChild(m_sss.NumberOfPanels - 1).gameObject);
                m_sss.pagination.transform.position += new Vector3(m_toggleWidth / 2f, 0, 0);

                //Panel
                m_sss.Remove(index);
            }
        }

        #endregion Methods
    }
}