using Thousandto.Plugins.Common.UniScene;
using System;
using System.Collections.Generic;
using UnityEngine;

public class FlyTeleportEditorScript : MonoBehaviour
{
    public int ID = 0;
    public string MapName = string.Empty;
    public float Length = 0f;

    public void InitWithData(FlyTeleportCfgData data)
    {
        ID = data.ID;
        MapName = data.MapName;
        Length = data.Length;
    }

    public List<List<FlyTeleportNodeScript>> GetChildNodes()
    {
        List<FlyTeleportNodeScript> childNodes = new List<FlyTeleportNodeScript>();
        for (int i = 0; i < transform.childCount; ++i)
        {
            var script = transform.GetChild(i).GetComponent<FlyTeleportNodeScript>();
            if (script != null)
            {
                childNodes.Add(script);
            }
        }
        List<List<FlyTeleportNodeScript>> result = new List<List<FlyTeleportNodeScript>>();
        if (childNodes.Count >= 2)
        {
            List<FlyTeleportNodeScript> curNodes = new List<FlyTeleportNodeScript>();
            curNodes.Add(childNodes[0]);
            result.Add(curNodes);

            for (int i = 1; i < childNodes.Count; ++i)
            {
                curNodes.Add(childNodes[i]);

                if (childNodes[i].BreakPoint)
                {
                    curNodes = new List<FlyTeleportNodeScript>();
                    curNodes.Add(childNodes[i]);
                    result.Add(curNodes);
                }
            }

            for (int i = result.Count - 1; i >= 0; --i)
            {
                if(result[i].Count <= 1)
                {
                    result.RemoveAt(i);
                }
            }
        }
        return result;
    }

    public List<List<FlyTeleportNodeScript>> CalculatePathNodePercent()
    {
        var chileNodes = GetChildNodes();
        Length = 0f;
        for (int j = 0; j < chileNodes.Count; ++j)
        {
            var child = chileNodes[j];

            Vector3[] path = new Vector3[child.Count];
            for (int i = 0; i < child.Count; ++i)
            {
                path[i] = child[i].transform.position;
            }

            Vector3[] itweenPath = iTween.PathControlPointGenerator(path);

            //先计算长度
            Vector3 prevPt = iTween.Interp(itweenPath, 0);
            int SmoothAmount = path.Length * 100;
            float pathLength = 0f;
            int k = 1;
            for (int i = 1; i <= SmoothAmount; i++)
            {
                float pm = (float)i / SmoothAmount;
                Vector3 currPt = iTween.Interp(itweenPath, pm);

                float nowDis = Vector3.Distance(prevPt, currPt);
                if (k < child.Count)
                {
                    var node = child[k];
                    if (node.transform.position == currPt)
                    {
                        node.Distance = pathLength + nowDis;
                        ++k;
                    }
                    else
                    {
                        var oldDir = prevPt - node.transform.position;
                        var newDir = currPt - node.transform.position;
                        if (oldDir.x * newDir.x < 0 || oldDir.y * newDir.y < 0 || oldDir.z * newDir.z < 0)
                        {
                            node.Distance = pathLength + Vector3.Distance(prevPt, node.transform.position);
                            ++k;
                        }
                    }
                }
                pathLength += nowDis;
                prevPt = currPt;
            }

            for (int i = 1; i < child.Count; ++i)
            {
                child[i].Percent = child[i].Distance / pathLength;
            }
            Length += pathLength;
        }

        return chileNodes;
    }

    void OnDrawGizmos()
    {
        var childNodes = GetChildNodes();
        for(int i=0;i< childNodes.Count;++i)
        {
            var posArray = new Vector3[childNodes[i].Count];
            for(int j=0;j< childNodes[i].Count;++j)
            {
                posArray[j] = childNodes[i][j].transform.position;
            }
            DrawPath(posArray, Color.green);

            for (int j = 0; j < childNodes[i].Count; ++j)
            {
                Gizmos.DrawSphere(childNodes[i][j].transform.position, 0.2f);
            }
        }
    }

    public static void DrawPath(Vector3[] path, Color color)
    {
        if (path.Length > 0)
        {
            DrawPathHelper(path, color, "gizmos");
        }
    }
    private static void DrawPathHelper(Vector3[] path, Color color, string method)
    {
        Vector3[] vector3s = PathControlPointGenerator(path);

        //Line Draw:
        Vector3 prevPt = Interp(vector3s, 0);
        Gizmos.color = color;
        int SmoothAmount = path.Length * 20;
        for (int i = 1; i <= SmoothAmount; i++)
        {
            float pm = (float)i / SmoothAmount;
            Vector3 currPt = Interp(vector3s, pm);
            if (method == "gizmos")
            {
                Gizmos.DrawLine(currPt, prevPt);
            }
            else if (method == "handles")
            {
                Debug.LogError("iTween Error: Drawing a path with Handles is temporarily disabled because of compatability issues with Unity 2.6!");
                //UnityEditor.Handles.DrawLine(currPt, prevPt);
            }
            prevPt = currPt;
        }
    }

    public static Vector3[] PathControlPointGenerator(Vector3[] path)
    {
        Vector3[] suppliedPath;
        Vector3[] vector3s;

        //create and store path points:
        suppliedPath = path;

        //populate calculate path;
        int offset = 2;
        vector3s = new Vector3[suppliedPath.Length + offset];
        Array.Copy(suppliedPath, 0, vector3s, 1, suppliedPath.Length);

        //populate start and end control points:
        //vector3s[0] = vector3s[1] - vector3s[2];
        vector3s[0] = vector3s[1] + (vector3s[1] - vector3s[2]);
        vector3s[vector3s.Length - 1] = vector3s[vector3s.Length - 2] + (vector3s[vector3s.Length - 2] - vector3s[vector3s.Length - 3]);

        //is this a closed, continuous loop? yes? well then so let's make a continuous Catmull-Rom spline!
        if (vector3s[1] == vector3s[vector3s.Length - 2])
        {
            Vector3[] tmpLoopSpline = new Vector3[vector3s.Length];
            Array.Copy(vector3s, tmpLoopSpline, vector3s.Length);
            tmpLoopSpline[0] = tmpLoopSpline[tmpLoopSpline.Length - 3];
            tmpLoopSpline[tmpLoopSpline.Length - 1] = tmpLoopSpline[2];
            vector3s = new Vector3[tmpLoopSpline.Length];
            Array.Copy(tmpLoopSpline, vector3s, tmpLoopSpline.Length);
        }

        return (vector3s);
    }
    //andeeee from the Unity forum's steller Catmull-Rom class ( http://forum.unity3d.com/viewtopic.php?p=218400#218400 ):
    public static Vector3 Interp(Vector3[] pts, float t)
    {
        int numSections = pts.Length - 3;
        int currPt = Mathf.Min(Mathf.FloorToInt(t * (float)numSections), numSections - 1);
        float u = t * (float)numSections - (float)currPt;

        Vector3 a = pts[currPt];
        Vector3 b = pts[currPt + 1];
        Vector3 c = pts[currPt + 2];
        Vector3 d = pts[currPt + 3];

        return .5f * (
            (-a + 3f * b - 3f * c + d) * (u * u * u)
            + (2f * a - 5f * b + 4f * c - d) * (u * u)
            + (-a + c) * u
            + 2f * b
        );
    }
}