/******************************************************************************
 * Copyright (C) Ultraleap, Inc. 2011-2021.                                   *
 *                                                                            *
 * Use subject to the terms of the Apache License 2.0 available at            *
 * http://www.apache.org/licenses/LICENSE-2.0, or another agreement           *
 * between Ultraleap and you, your company or other organization.             *
 ******************************************************************************/

using Leap;
using System.Collections;
using UnityEngine;

namespace Leap.Unity
{
    /**
     * Tracks the connection state of the Leap Motion hardware. If the device is unplugged
     * or otherwise not detected, the script fades in a GUITexture object which should communicate
     * the problem to the user.
     *
     * @deprecated Use ConnectionMonitor in new code.
     */
    public class DisconnectionNotice : MonoBehaviour
    {

        /** The speed to fade the object alpha from 0 to 1. */
        public float fadeInTime = 1.0f;
        /** The speed to fade the object alpha from 1 to 0. */
        public float fadeOutTime = 1.0f;
        /** The easing curve. */
        public AnimationCurve fade;
        /** A delay before beginning the fade-in effect. */
        public int waitFrames = 10;
        /** The fully on texture tint color. */
        public Color onColor = Color.white;

        private Controller leap_controller_;
        private float fadedIn = 0.0f;
        private int frames_disconnected_ = 0;
        private UnityEngine.UI.Image _image;

        void Start()
        {
            leap_controller_ = new Controller();
            if (_image == null) { _image = GetComponent<UnityEngine.UI.Image>(); }
            SetAlpha(0.0f);
        }

        void SetAlpha(float alpha)
        {
            if (_image != null) { _image.color = Color.Lerp(Color.clear, onColor, alpha); }
        }

        /** The connection state of the controller. */
        bool IsConnected()
        {
            return leap_controller_.IsConnected;
        }

        void Update()
        {

            if (IsConnected())
                frames_disconnected_ = 0;
            else
                frames_disconnected_++;

            if (frames_disconnected_ < waitFrames)
                fadedIn -= Time.deltaTime / fadeOutTime;
            else
                fadedIn += Time.deltaTime / fadeInTime;
            fadedIn = Mathf.Clamp(fadedIn, 0.0f, 1.0f);

            SetAlpha(fade.Evaluate(fadedIn));
        }
    }
}