using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VFX;
using UnityEngine.VFX.Utility;

namespace Assets.WasapiAudio.Scripts.Unity
{
    [AddComponentMenu("VFX/Property Binders/Spectre - VFX SDF Binder")]
    [VFXBinder("Kaiju/Kaiju - Spectrum to 3d SDF Binder")]
    public class SpectreVfxSdfBinder : VFXBinderBase {
        [SerializeReference]
        [SerializeReferenceButton]
        public List<SpectrumTransformer> Transformers = new List<SpectrumTransformer>();

        [SpectrumDataPreview]
        public SpectrumData Preview;

        public AudioSource source;
        public bool symmetric = false;

        private Texture3D _texture;
        private Color[] _colorCache;

        private int z = 0;

        private void UpdateTexture() {
            if (_texture == null)
            {
                _texture = new Texture3D(source.SpectrumSize * 2, source.SpectrumSize * 2, source.SpectrumSize * 2, TextureFormat.RFloat, false);
                _texture.wrapMode = TextureWrapMode.Clamp;
                _texture.name = $"AudioSpectrumDataSDF{source.SpectrumSize}";
                _colorCache = new Color[
                    source.SpectrumSize * 2 *
                    source.SpectrumSize * 2 *
                    source.SpectrumSize * 2
                ];
            }

            var spectrumData = GetSpectrumData();
            if (spectrumData == null) return;

            // go from 0 to end of spectrum
            for (int x = 0; x < source.SpectrumSize; x++) {
                float height = spectrumData[x] * source.SpectrumSize * 2;

                // go from 0 to double the spectrum height
                for (int y = 0; y < source.SpectrumSize * 2; y++) {
                    float distance = (y - height);

                    var z_part = z * (source.SpectrumSize * 2 * source.SpectrumSize * 2);
                    var y_part = y * source.SpectrumSize * 2;

                    _colorCache[z_part + y_part + (source.SpectrumSize + x)] = new Color(distance, 0, 0, 0);
                    _colorCache[z_part + y_part + (source.SpectrumSize - (x + 1))] = new Color(distance, 0, 0, 0);
                }
            }

            z = (z + 1) % (source.SpectrumSize * 2);

            // Debug.Log($"{z}");

            _texture.SetPixels(_colorCache);
            _texture.Apply();
        }

        public override bool IsValid(VisualEffect component) {
            return source != null;
        }

        protected float[] GetSpectrumData() {
            // Get raw / unmodified spectrum data
            var spectrumData = source.GetSpectrumData();

            // Run spectrum data through all configured transformers
            if (Transformers != null && Transformers.Count > 0) {
                foreach (var transformer in Transformers) {
                    spectrumData = transformer.Transform(spectrumData);
                }
            }

            Preview.Values = spectrumData;
            return spectrumData;
        }

        public override void UpdateBinding(VisualEffect component) {
            UpdateTexture();
            component.SetUInt("SpectrumSize", (uint) source.SpectrumSize);
            component.SetTexture("SpectrumDataTexture", _texture);
        }

        public override string ToString() {
            return "Audio Spectrum Data";
        }
    }
}