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

public class ShipPhysicsEditor : EditorWindow
{

    private float m_GravityStrength = 9.8f;
    private Vector3 m_Point;
    private RotationController m_Ship;
    private float m_radius = 0;
    private float m_oldRadius = 0;

    // Add menu named "My Window" to the Window menu
    [MenuItem("Tools/Ship Physics")]
    static void Init()
    {
        // Get existing open window or if none, make a new one:
        ShipPhysicsEditor window = (ShipPhysicsEditor)EditorWindow.GetWindow(typeof(ShipPhysicsEditor));

        window.m_Ship = FindObjectOfType<RotationController>();
        window.m_Point = window?.m_Ship.Position ?? Vector3.zero;
        window.RegisterSceneGUI(true);
        window.Show();
        
    }

    private void OnDestroy()
    {
        RegisterSceneGUI(false);
    }


    public void OnGUI()
    {
        GUILayout.Label("Base Settings", EditorStyles.boldLabel);

        m_Ship = EditorGUILayout.ObjectField(m_Ship, typeof(RotationController), true) as RotationController;

        m_GravityStrength = EditorGUILayout.FloatField("Gravity", m_GravityStrength);
        m_radius = EditorGUILayout.FloatField("Radius", m_radius);

        if (m_oldRadius != m_radius)
        {
            Vector3 direction;
            if (m_Point == m_Ship.Position)
                direction = Vector3.Cross(m_Ship.RotationAxis, (m_Ship.RotationAxis != Vector3.right) ? Vector3.left : Vector3.up);
            else
                direction = m_Ship.getDownDirection(m_Point);

            m_Point = m_Ship.Position + direction * m_radius;

            m_oldRadius = m_radius;
            SceneView.RepaintAll();
        }


        if (GUILayout.Button("Set Rotation"))
            m_Ship.SetGravityAtRadius(m_GravityStrength, m_radius);
    }


    void OnSceneGUI(SceneView sceneView)
    {


        EditorGUI.BeginChangeCheck();
        m_Point = Handles.PositionHandle(m_Point, m_Ship.getUpRotation(m_Point));
        if (EditorGUI.EndChangeCheck())
        {
            m_Point = Vector3.ProjectOnPlane(m_Point, m_Ship.RotationAxis) + Vector3.Project(m_Ship.Position, m_Ship.RotationAxis);
            m_radius = m_Ship.getDownDirection(m_Point, false).magnitude;
            m_oldRadius = m_radius;
            Repaint();
        }

        Handles.color = Color.red;
        Handles.DrawLine(m_Point, m_Ship.Position);


        Handles.BeginGUI();
        // Do your drawing here using GUI.
        Handles.EndGUI();
    }


    private void RegisterSceneGUI(bool value)
    {
        if (value)
            SceneView.duringSceneGui += this.OnSceneGUI;

        else
            SceneView.duringSceneGui -= this.OnSceneGUI;

        SceneView.RepaintAll();
    }



}