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

namespace UnityCommon
{
    public class SmartLabel : MonoBehaviour
    {
        public static SmartLabel GetSmartLabel(Transform tfTarget, SmartLabelItem smartLabelItemSample, SmartLabelHelperBase helper)
        {
            var sl = tfTarget.gameObject.AddComponentOnlyOne<SmartLabel>();
            sl.Init(smartLabelItemSample, helper);
            return sl;
        }

        private List<SmartLabelItem> listItems = new List<SmartLabelItem>();
        Dictionary<Transform, SmartLabelItem> dicItems = new Dictionary<Transform, SmartLabelItem>();
        private Canvas canvas;
        private Vector3 centerP;
        string startCharts = "BiaoZhu_";
        List<Transform> listTarget;
        private void Init(SmartLabelItem smartLabelItemSample, SmartLabelHelperBase helper)
        {
            listItems.Clear();
            GameObject goUI = new GameObject("UI");
            goUI.transform.SetParent(transform, false);
            canvas = goUI.AddComponent<Canvas>();
            goUI.AddComponent<GraphicRaycaster>();
            canvas.renderMode = RenderMode.ScreenSpaceOverlay;
            centerP = Utility.GetCenterPosition(transform);

            var children = transform.GetComponentsInChildren<Transform>();
            listTarget = new List<Transform>();
            for (int i = 0; i < children.Length; ++i)
            {
                var child = children[i];
                if (child.name.StartsWith(startCharts))
                {
                    listTarget.Add(child);
                    //var strName = child.name.Substring(startCharts.Length);
                    //Transform tfTargetItem = child.transform;
                    //var goItemLabel = Instantiate(smartLabelItemSample.gameObject);
                    //goItemLabel.transform.SetParent(goUI.transform, false);
                    //var smartLabelItem = goItemLabel.GetComponent<SmartLabelItem>();

                    //smartLabelItem.SetLabel(strName, canvas, tfTargetItem, angle += 15 /*centerP*/);
                    //smartLabelItem.SetHelper(helper);
                    //listItems.Add(smartLabelItem);
                }
            }
            SortItems();

            dicItems.Clear();
            float angle = 0;
            for (int i = 0; i < listTarget.Count; ++i)
            {
                var child = listTarget[i];
                var strName = child.name.Substring(startCharts.Length);
                Transform tfTargetItem = child.transform;
                var goItemLabel = Instantiate(smartLabelItemSample.gameObject);
                goItemLabel.transform.SetParent(goUI.transform, false);
                var smartLabelItem = goItemLabel.GetComponent<SmartLabelItem>();

                smartLabelItem.SetLabel(strName, canvas, tfTargetItem, angle/*centerP*/);
                angle += 360 / listTarget.Count;
                smartLabelItem.SetHelper(helper);
                listItems.Add(smartLabelItem);
                dicItems[child] = smartLabelItem;
            }
        }
        private void Update()
        {
            if (listTarget != null)
            {
                UpdateAngle();
            }
        }
        private void SortItems()
        {
            listTarget.Sort(delegate (Transform tf1, Transform tf2)
            {
                var p1 = Utility.WordPosition2UILocalposition(Camera.main, canvas, tf1.position);
                var p2 = Utility.WordPosition2UILocalposition(Camera.main, canvas, tf2.position);
                var pCenter = Utility.WordPosition2UILocalposition(Camera.main, canvas, centerP);
                var sub = Vector3.up.Angle360(p1) - Vector3.up.Angle360(p2);
                if (sub > 0)
                    return 1;
                else if (sub < 0)
                    return -1;
                else
                {// =0
                    if (Vector3.Distance(tf1.position, centerP) - Vector3.Distance(tf2.position, centerP) > 0)
                        return 1;
                    else
                        return -1;
                }
            });
        }
        private void UpdateAngle()
        {
            SortItems();
            float angle = 0;
            for (int i = 0; i < listTarget.Count; ++i)
            {
                dicItems[listTarget[i]].SetAngle(angle);
                //dicItems[listTarget[i]].SetLabel(i.ToString());
                angle += 360 / listTarget.Count;
            }
        }
        private void OnDestroy()
        {
            Destroy(canvas.gameObject);
            canvas = null;
        }
        public void Show()
        {
            foreach (var item in listItems)
            {
                item.Show();
            }
        }
        public void Close()
        {
            foreach (var item in listItems)
            {
                item.Hide();
            }
        }
    }
}