using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Kolkhoze;
using System.Text;
using System;
using System.Runtime.InteropServices;

namespace Kolkhoze {
    public class AlienFX : MonoBehaviour {

        bool _isActive = false;
        bool isActive { get { return _isActive; } }

        uint _nbDevice = 0;
        uint nbDevice { get { return _nbDevice; } }

        uint _nbLights = 0;
        uint nbLights { get { return _nbLights; } }

        // Use this for initialization
        void Start () {
            _isActive = Init ();

            if (isActive) {
                StartCoroutine (ColorGradient (
                    Color.blue, Color.red, 0));
            }
        }

        /// <summary>
        /// Init AlienFX dll.
        /// </summary>
        bool Init () {
            if (AlienWrapper.LFX_Initialize () != AlienWrapper.LFX_SUCCESS) {
                Debug.Log ("AlienFX : Init failed");
                return false;
            }

            if (AlienWrapper.LFX_Reset () != AlienWrapper.LFX_SUCCESS) {
                Debug.Log ("AlienFX : Reset failed");
                return false;
            }

            if (AlienWrapper.LFX_GetNumDevices (ref _nbDevice) != AlienWrapper.LFX_SUCCESS) {
                Debug.Log ("AlienFX : GetNumDevices failed");
                return false;
            }

            if (_nbDevice == 0) {
                Debug.Log ("AlienFX : Found no AlienFX device");
                return false;
            }

            if (AlienWrapper.LFX_GetNumLights (0, ref _nbLights) != AlienWrapper.LFX_SUCCESS) {
                Debug.Log ("AlienFX : GetNumLights failed");
                return false;
            }

            Debug.Log ("AlienFX : Found " + _nbLights + " lights");

            return true;
        }

        /// <summary>
        /// Oscillate gradually between two colors
        /// </summary>
        public IEnumerator ColorGradient(Color color1, Color color2, float duration = 0) {
            float animDuration = 0.5f;
            float globalTime = 0;
            while (duration == 0 || globalTime <= duration) {
                float t = 0;
                while (t <= animDuration) {
                    Color lerpedColor = Color.Lerp (color1, color2, t / animDuration);
                    SetAllLights (ColorToLFX (lerpedColor));
                    t += Time.deltaTime;
                    yield return null;
                }

                t = 0;

                while (t <= animDuration) {
                    Color lerpedColor = Color.Lerp (color2, color1, t / animDuration);
                    SetAllLights (ColorToLFX (lerpedColor));
                    t += Time.deltaTime;
                    yield return null;
                }

                globalTime += 2 * animDuration;
            }

            yield break;
        }

        /// <summary>
        /// Sets all lights to a specific color
        /// </summary>
        public void SetAllLights(AlienWrapper.LFX_COLOR color) {
            for (uint lightIndex = 0; lightIndex < nbLights; lightIndex++) {
                AlienWrapper.LFX_SetLightColor (0, lightIndex, ref color);
            }

            AlienWrapper.LFX_Update ();
        }


        /// <summary>
        /// Utility function to translate Unity color to LFX color
        /// </summary>
        public static AlienWrapper.LFX_COLOR ColorToLFX(Color color) {
            return new AlienWrapper.LFX_COLOR (
                (byte)(color.r * 255),
                (byte)(color.g * 255),
                (byte)(color.b * 255),
                (byte)(color.a * 255)
            );
        }
    }
}