using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;

[CustomEditor(typeof(WaypointsGroup))]
public class WaypointsGroupEditor : Editor
{
    WaypointsGroup waypointsGroup;
    List<Waypoint> waypoints;

    Waypoint selectedWaypoint = null;

    private void OnEnable()
    {
        waypointsGroup = target as WaypointsGroup;
        waypoints = waypointsGroup.GetWaypointChildren();
    }

    private void OnSceneGUI()
    {
        DrawWaypoints(waypoints );
    }

    override public void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        EditorGUILayout.BeginVertical();

        EditorGUILayout.LabelField("Waypoints");

        bool dorepaint = false;


        if (waypoints != null)
        {

                

            int delIndex = -1;
            for (int cnt = 0; cnt < waypoints.Count; cnt++)
            {
                Color guiColor = GUI.color;

                Waypoint cwp = waypoints[cnt];

                if (cwp == selectedWaypoint)
                    GUI.color = Color.green;

                EditorGUILayout.BeginHorizontal();
                if (GUILayout.Button("S", GUILayout.Width(20)))
                {
                    if(selectedWaypoint == cwp)
                    {
                        selectedWaypoint = null;
                    }
                    else
                    {
                        selectedWaypoint = cwp;
                    }
                        
                    dorepaint = true;

                }

                EditorGUI.BeginChangeCheck();
                Vector3 oldV = cwp.GetPosition(waypointsGroup.XYZConstraint);
                Vector3 newV = EditorGUILayout.Vector3Field("", oldV);
                if(EditorGUI.EndChangeCheck())
                {
                    Undo.RecordObject(waypointsGroup, "Waypoint Moved");
                    cwp.UpdatePosition(newV - oldV, waypointsGroup.XYZConstraint);
                }
                    


                if (GUILayout.Button("D", GUILayout.Width(25)))
                {
                    delIndex = cnt;
                    dorepaint = true;

                }
                GUI.color = guiColor;
                EditorGUILayout.EndHorizontal();

            }

            if (delIndex > -1)
            {
                if (waypoints[delIndex] == selectedWaypoint)
                    selectedWaypoint = null;
                waypoints.RemoveAt(delIndex);
            }

        }


        if (GUILayout.Button("Add"))
        {
            Undo.RecordObject(waypointsGroup, "Waypoint Added");
            int ndx = -1;
            if(selectedWaypoint != null)
            {
                ndx = waypoints.IndexOf(selectedWaypoint);
                if (ndx == -1)
                    selectedWaypoint = null;
                else
                    ndx += 1;
            }

                
            Waypoint wp = new Waypoint();
            wp.CopyOther(selectedWaypoint);
            waypointsGroup.AddWaypoint(wp, ndx);
            selectedWaypoint = wp;
            dorepaint = true;

        }

        EditorGUILayout.EndVertical();
        if (dorepaint)
        {
            SceneView.RepaintAll();
        }

    }

    public void DrawWaypoints(List<Waypoint> waypoints)
    {
        bool doRepaint = false;
        if (waypoints != null)
        {

            int cnt = 0;
            foreach (Waypoint wp in waypoints)
            {
                doRepaint |= DrawInScene(wp);

                // Draw a pointer line 
                if(cnt < waypoints.Count-1)
                {
                    Waypoint wpnext = waypoints[cnt+1];
                    Handles.DrawLine(wp.GetPosition(waypointsGroup.XYZConstraint), wpnext.GetPosition(waypointsGroup.XYZConstraint));
                }
                else
                {
                    Waypoint wpnext = waypoints[0];
                    Color c = Handles.color;
                    Handles.color = Color.gray;
                    Handles.DrawLine(wp.GetPosition(waypointsGroup.XYZConstraint), wpnext.GetPosition(waypointsGroup.XYZConstraint));
                    Handles.color = c;
                }
                cnt += 1;
            }
        }
        if(doRepaint)
        {
            Repaint();
        }

    }


    public bool DrawInScene(Waypoint waypoint, int controlID = -1)
    {
        if (waypoint == null)
        {
            Debug.Log("NO WP!");
            return false;
        }

        bool doRepaint = false;
        //None serialized field, gets "lost" during serailize updates;
        waypoint.SetWaypointGroup(waypointsGroup);
            


        if (selectedWaypoint == waypoint)
        {
            Color c = Handles.color;
            Handles.color = Color.green;

            //Vector3 newPos = Handles.FreeMoveHandle(waypoint.GetPosition(), waypoint.rotation, 1.0f, Vector3.zero, Handles.SphereHandleCap);
            EditorGUI.BeginChangeCheck();
            Vector3 oldpos = waypoint.GetPosition(waypointsGroup.XYZConstraint);
            Vector3 newPos = Handles.PositionHandle(oldpos, waypoint.rotation);

            float handleSize = HandleUtility.GetHandleSize(newPos);

            Handles.SphereHandleCap(-1, newPos, waypoint.rotation, 0.25f * handleSize, EventType.Repaint);
            if (EditorGUI.EndChangeCheck())
            {
                Undo.RecordObject(waypointsGroup, "Waypoint Moved");
                waypoint.UpdatePosition(newPos - oldpos, waypointsGroup.XYZConstraint);
            }
                
            Handles.color = c;
                
        }
        else
        {
            Vector3 currPos = waypoint.GetPosition(waypointsGroup.XYZConstraint);
            float handleSize = HandleUtility.GetHandleSize(currPos);
            if (Handles.Button(currPos, waypoint.rotation, 0.25f * handleSize, 0.25f * handleSize, Handles.SphereHandleCap))
            {
                doRepaint = true;
                selectedWaypoint = waypoint;
            }
             
        }
        return doRepaint;
    }






    // Menu item for creating a waypoints group
    [MenuItem("GameObject/WaypointsFree/Create WaypointsGroup")]
    public static void CreateRFPathManager()
    {
        GameObject go = new GameObject("WaypointsGroup");
        go.AddComponent<WaypointsGroup>();
        // Select it:
        Selection.activeGameObject = go;


    }


}