using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.EventSystems;

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

public class FlowerCard : MonoBehaviour
{
	#region 变量

    public int SelectIndex;
    public int ScrollSelectIndex;
    public bool SelectLock;
    public float LeftBorder;
    public float RightBorder;

    public Transform SeleItem;
    public Transform ScrollSeleItem;
    public List<Transform> ItemList;
    public List<FlowerInfo> InfoList;

    public ScrollRectPlus ScrollRect;

    #endregion

    public void RegistValue()
    {
        InfoList = new List<FlowerInfo>();
        ItemList = new List<Transform>();

        SelectIndex = -1;

        ScrollRect = ManaReso.Get<ScrollRectPlus>("H_Scrr");

        ScrollRect.DragEvent += OnDrag;
        ScrollRect.EndDragEvent += OnEndDrag;

        MoveVec moveVec = ScrollRect.content.CreateMoveVec();

        moveVec.OnStart += () =>
        {
            SelectLock = true;
        };

        moveVec.OnFinish += () =>
        {
            SelectLock = false;
        };
    }


    public void Add(FlowerInfo flowerInfo)
    {
        Transform tra = ManaReso.GetFlowerItemH();

        tra.CreateTweenScale(new Vector3(1, 1, 1), new Vector3(1.25f, 1.25f, 1), 0.25f, true, true, Curve.EaseOutQuad);
        
        Image image = tra.transform.GetChild(0).GetComponent<Image>();

        image.sprite = flowerInfo.Sprite;

        Vector2 newSize = flowerInfo.Sprite.rect.size;
        newSize.x *= 0.2f;
        newSize.y *= 0.2f;
        image.rectTransform.sizeDelta = newSize;

        Button button = tra.GetComponent<Button>();

        button.onClick.AddListener
        (
            () =>
            {
                Select(tra);
            }
        );
        
        InfoList.Add(flowerInfo);
        ItemList.Add(tra);
    }

    public void Close()
    {
        if (ItemList.Valid() == false)
        {
            return;
        }

        SeleItem.TweenBacScale();
        SeleItem = null;

        SelectIndex = -1;

        for (int i = 0; i < ItemList.Count; i++)
        {
            ManaReso.SaveUI(ItemList[i]);
        }

        Vector3 delta = ScrollRect.transform.position - ItemList[0].transform.position;

        delta.y = 0;
        delta.z = 0;

        ScrollRect.content.MoveVec(ScrollRect.content.transform.position + delta, 0.25f, Curve.EaseOutQuad);

        InfoList = new List<FlowerInfo>();
        ItemList = new List<Transform>();

        ManaReso.Get<ContentSizeFitter>("H_Grid").enabled = true;
        ManaReso.Get<HorizontalLayoutGroup>("H_Grid").enabled = true;
    }


    public void Select(int index)
    {
        if (SelectLock)
        {
            return;
        }
        
        if (SelectIndex != index)
        {
            if (SeleItem != null)
            {
                SeleItem.TweenBacScale();
            }
            
            SelectIndex = index;

            SeleItem = ItemList[index];

            SeleItem.TweenForScale();
            SeleItem.transform.SetAsLastSibling();

            ManaGarden.SetFlowerCard(InfoList[index]);

            Vector3 delta = ScrollRect.transform.position - SeleItem.transform.position;

            delta.y = 0;
            delta.z = 0;

            ScrollRect.content.MoveVec(ScrollRect.content.transform.position + delta, 0.25f, Curve.EaseOutQuad);
        }
    }

    public void Select(Transform item)
    {
        Select(ItemList.IndexOf(item));
    }


    public void PrevItem()
    {
        if (SelectIndex > 0)
        {
            Select(SelectIndex - 1);
        }
    }

    public void NextItem()
    {
        if (SelectIndex < ItemList.Count - 1)
        {
            Select(SelectIndex + 1);
        }
    }


    private void OnDrag(PointerEventData eventData)
    {
        if (ItemList.Count > 2)
        {
            ScrollRect.horizontal = true;

            if (ScrollRect.content.position.x < LeftBorder)
            {
                ScrollRect.content.SetX(LeftBorder);
            }
            else if (ScrollRect.content.position.x > RightBorder)
            {
                ScrollRect.content.SetX(RightBorder);
            }
        }
        else
        {
            ScrollRect.horizontal = false;
        }

        float minX = 999999999;

        for (int i = 0; i < ItemList.Count; i++)
        {
            float x = Mathf.Abs(ItemList[i].localPosition.x - ScrollRect.content.InverseTransformPoint(ScrollRect.transform.position).x);

            if (x < minX)
            {
                minX = x;
                ScrollSeleItem = ItemList[i];
                ScrollSelectIndex = i;
            }
        }

        if (ScrollSelectIndex != SelectIndex)
        {
            SeleItem.TweenBacScale();

            ScrollSeleItem.TweenForScale();
            ScrollSeleItem.SetAsLastSibling();

            SeleItem = ScrollSeleItem;
            SelectIndex = ScrollSelectIndex;

            ManaGarden.SetFlowerCard(InfoList[ScrollSelectIndex]);
        }
    }

    private void OnEndDrag(PointerEventData eventData)
    {
        Vector3 delta = ScrollRect.transform.position - SeleItem.transform.position;

        delta.y = 0;
        delta.z = 0;

        ScrollRect.content.MoveVec(ScrollRect.content.transform.position + delta, 0.25f, Curve.EaseOutQuad);
    }
}