﻿using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace SuperScrollView
{
    public class ResponsiveViewDemoScript : MonoBehaviour
    {
        public LoopListView2 mLoopListView;
        public int mTotalDataCount = 10000;
        DataSourceMgr<ItemData> mDataSourceMgr;
        int mItemCountPerRow = 3;
        int mMinWidth = 200;
        public DragChangSizeScript mDragChangSizeScript;
        Button mSetCountButton;
        InputField mSetCountInput;
        Button mScrollToButton;
        InputField mScrollToInput;
        Button mAddButton;
        InputField mAddInput;
        Button mBackButton;     

        // Use this for initialization
        void Start()
        {
            mDataSourceMgr = new DataSourceMgr<ItemData>(mTotalDataCount);
            int count = mDataSourceMgr.TotalItemCount / mItemCountPerRow;
            if (mDataSourceMgr.TotalItemCount % mItemCountPerRow > 0)
            {
                count++;
            }
            mLoopListView.InitListView(count, OnGetItemByIndex);   
            mDragChangSizeScript.mOnDragEndAction = OnViewPortSizeChanged;
            OnViewPortSizeChanged();
            InitButtonPanel();
        }

        void InitButtonPanel()
        {
            mSetCountButton = GameObject.Find("ButtonPanel/ButtonGroupSetCount/SetCountButton").GetComponent<Button>();
            mSetCountInput = GameObject.Find("ButtonPanel/ButtonGroupSetCount/SetCountInputField").GetComponent<InputField>();
            mSetCountButton.onClick.AddListener(OnSetCountButtonClicked);
            
            mScrollToButton = GameObject.Find("ButtonPanel/ButtonGroupScrollTo/ScrollToButton").GetComponent<Button>();
            mScrollToInput = GameObject.Find("ButtonPanel/ButtonGroupScrollTo/ScrollToInputField").GetComponent<InputField>();
            mScrollToButton.onClick.AddListener(OnScrollToButtonClicked);

            mAddButton = GameObject.Find("ButtonPanel/ButtonGroupAdd/AddButton").GetComponent<Button>();
            mAddButton.onClick.AddListener(OnAddButtonClicked);
            mAddInput = GameObject.Find("ButtonPanel/ButtonGroupAdd/AddInputField").GetComponent<InputField>();

            mBackButton = GameObject.Find("ButtonPanel/BackButton").GetComponent<Button>();
            mBackButton.onClick.AddListener(OnBackButtonClicked);
        }       

        void UpdateItemPrefab()
        {
            ItemPrefabConfData tData = mLoopListView.GetItemPrefabConfData("ItemPrefab");
            GameObject prefabObj = tData.mItemPrefab;
            RectTransform rf = prefabObj.GetComponent<RectTransform>();
            BaseHorizontalItemList itemScript = prefabObj.GetComponent<BaseHorizontalItemList>();
            float w = mLoopListView.ViewPortWidth;
            int count = itemScript.mItemList.Count;
            GameObject p0 = itemScript.mItemList[0].gameObject;
            RectTransform rf0 = p0.GetComponent<RectTransform>();
            float w0 = rf0.rect.width;
            int c = Mathf.FloorToInt(w / w0);
            if(c == 0)
            {
                c = 1;
            }
            mItemCountPerRow = c;
            float padding = (w - w0 * c) / (c + 1);
            if(padding < 0)
            {
                padding = 0;
            }
            if(w < mMinWidth)
            {
                w = mMinWidth;
            }
            rf.SetSizeWithCurrentAnchors(RectTransform.Axis.Horizontal, w);
            if (c > count)
            {
                int dif = c - count;
                for (int i = 0; i < dif; ++i)
                {
                    GameObject go = Object.Instantiate(p0,Vector3.zero,Quaternion.identity,rf);
                    RectTransform trf = go.GetComponent<RectTransform>();
                    trf.localScale = Vector3.one;
                    trf.anchoredPosition3D = Vector3.zero;
                    trf.rotation = Quaternion.identity;
                    BaseHorizontalItem t = go.GetComponent<BaseHorizontalItem>();
                    itemScript.mItemList.Add(t);
                }
            }
            else if (c < count)
            {
                int dif = count - c;
                for (int i = 0; i < dif; ++i)
                {
                    BaseHorizontalItem go = itemScript.mItemList[itemScript.mItemList.Count - 1];
                    itemScript.mItemList.RemoveAt(itemScript.mItemList.Count - 1);
                    Object.DestroyImmediate(go.gameObject);
                }
            }
            float curX = padding;
            for (int k = 0; k < itemScript.mItemList.Count; ++k)
            {
                GameObject obj = itemScript.mItemList[k].gameObject;
                obj.GetComponent<RectTransform>().anchoredPosition3D = new Vector3(curX, 0, 0);
                curX = curX + w0 + padding;
            }
            mLoopListView.OnItemPrefabChanged("ItemPrefab");
        }

        void OnViewPortSizeChanged()
        {
            UpdateItemPrefab();
            int count1 = mDataSourceMgr.TotalItemCount / mItemCountPerRow;
            if (mDataSourceMgr.TotalItemCount % mItemCountPerRow > 0)
            {
                count1++;
            }
            mLoopListView.SetListItemCount(count1, false);
            mLoopListView.RefreshAllShownItem();
        }

        LoopListViewItem2 OnGetItemByIndex(LoopListView2 listView, int index)
        {
            if (index < 0)
            {
                return null;
            }
            LoopListViewItem2 item = listView.NewListViewItem("ItemPrefab");
            BaseHorizontalItemList itemScript = item.GetComponent<BaseHorizontalItemList>();
            if (item.IsInitHandlerCalled == false)
            {
                item.IsInitHandlerCalled = true;
                itemScript.Init();
            }
            for (int i = 0; i < mItemCountPerRow; ++i)
            {
                int itemIndex = index * mItemCountPerRow + i;
                if (itemIndex >= mDataSourceMgr.TotalItemCount)
                {
                    itemScript.mItemList[i].gameObject.SetActive(false);
                    continue;
                }
                ItemData itemData = mDataSourceMgr.GetItemDataByIndex(itemIndex);
                if (itemData != null)
                {
                    itemScript.mItemList[i].gameObject.SetActive(true);
                    itemScript.mItemList[i].SetItemData(itemData, itemIndex);
                }
                else
                {
                    itemScript.mItemList[i].gameObject.SetActive(false);
                }
            }
            return item;
        }    

        void OnSetCountButtonClicked()
        {
            int count = 0;
            if (int.TryParse(mSetCountInput.text, out count) == false)
            {
                return;
            }
            if (count < 0)
            {
                return;
            }
            int tmpRow = GetRow(count); 
            mDataSourceMgr.SetDataTotalCount(count);     
            mLoopListView.SetListItemCount(tmpRow, false);
            mLoopListView.RefreshAllShownItem();            
        }  

        void OnScrollToButtonClicked()
        {
            int itemIndex = 0;
            if (int.TryParse(mScrollToInput.text, out itemIndex) == false)
            {
                return;
            }
            if((itemIndex < 0) || (itemIndex >= mDataSourceMgr.TotalItemCount))
            {
                return;
            }
            int tmpRowIndex = GetRowIndex(itemIndex+1);            
            mLoopListView.MovePanelToItemIndex(tmpRowIndex, 0);
        }

        int GetRow(int itemCount)
        {
            int tmpRow = itemCount / mItemCountPerRow;
            if (itemCount % mItemCountPerRow > 0)
            {
                tmpRow++;
            }
            return tmpRow;
        }

        int GetRowIndex(int itemCount)
        {
            int tmpRow = GetRow(itemCount);
            if (tmpRow > 0)
            {
                tmpRow--;
            }
            return tmpRow;
        }

        void OnAddButtonClicked()
        {
            int itemIndex = 0;
            if (int.TryParse(mAddInput.text, out itemIndex) == false)
            {
                return;
            }
            if((itemIndex < 0) || (itemIndex > mDataSourceMgr.TotalItemCount))
            {
                return;
            }               
            ItemData newData = mDataSourceMgr.InsertData(itemIndex);  
            newData.mDesc = newData.mDesc +" [New]";
            int tmpRow = GetRow(mDataSourceMgr.TotalItemCount);
            mLoopListView.SetListItemCount(tmpRow, false);             
            mLoopListView.RefreshAllShownItem();     
        }     

        void OnBackButtonClicked()
        {
            ButtonPanelMenuList.BackToMainMenu();
        }      
    }
}
