using UnityEngine;
using System.Collections;

namespace ARPGFX
{

    public class ARPGFXLightFlicker : MonoBehaviour
    {
        // Properties
        [Header("sin,tri,sqr,saw,inv,noise")]
        public string waveFunction = "sin"; // possible values: sin, tri(angle), sqr(square), saw(tooth), inv(verted sawtooth), noise (random)
        public float startValue = 0.0f; // start
        [Header("Amplitude of wave")]
        public float amplitude = 1.0f; // amplitude of the wave
        [Header("Start point inside on wave cycle")]
        public float phase = 0.0f; // start point inside on wave cycle
        [Header("Frequency per second")]
        public float frequency = 0.5f; // cycle frequency per second

        // Keep a copy of the original color
        private Color originalColor;

        // Store the original color
        void Start()
        {
            originalColor = GetComponent<Light>().color;
            phase = Random.Range(0f, 1f);
            //Debug.Log(phase);
        }

        void Update()
        {
            Light light = GetComponent<Light>();
            light.color = originalColor * (EvalWave());
        }

        float EvalWave()
        {
            float x = (Time.time + phase) * frequency;
            float y;

            x = x - Mathf.Floor(x); // normalized value (0..1)

            if (waveFunction == "sin")
            {
                y = Mathf.Sin(x * 2 * Mathf.PI);
            }
            else if (waveFunction == "tri")
            {
                if (x < 0.5f)
                    y = 4.0f * x - 1.0f;
                else
                    y = -4.0f * x + 3.0f;
            }
            else if (waveFunction == "sqr")
            {
                if (x < 0.5f)
                    y = 1.0f;
                else
                    y = -1.0f;
            }
            else if (waveFunction == "saw")
            {
                y = x;
            }
            else if (waveFunction == "inv")
            {
                y = 1.0f - x;
            }
            else if (waveFunction == "noise")
            {
                y = 1 - (Random.value * 2);
            }
            else
            {
                y = 1.0f;
            }
            return (y * amplitude) + startValue;
        }
    }

}