using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Un4seen.Bass;
using Un4seen.Bass.Misc;
using Un4seen.BassWasapi;

namespace audioVisualizer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        List<byte> _spectrumdata = new List<byte>();
        int devindex;
        float[] fft = new float[1024];
        int _lines = 3;
        WASAPIPROC wasapiProcess;
        BassWasapiHandler _wasapi;
        private void button1_Click(object sender, EventArgs e)
        {
            var array = (comboBox1.Items[comboBox1.SelectedIndex] as string).Split(' ');
            devindex = Convert.ToInt32(array[0]);
            //MessageBox.Show(devindex + "lol");
            bool result = BassWasapi.BASS_WASAPI_Init(devindex, 0, 0, BASSWASAPIInit.BASS_WASAPI_BUFFER, 1f, 0.05f, wasapiProcess, IntPtr.Zero);

            BassWasapi.BASS_WASAPI_Start();
            System.Threading.Thread.Sleep(500);
            timer1.Enabled = true;
            /*
            //BassWasapiHandler lol = new BassWasapiHandler(devindex, false, 48000, 2, 0f, 0f);

            BassWasapiHandler _wasapi = new BassWasapiHandler(devindex, false, 48000, 2, 0f, 0f);
            int stream = Bass.BASS_StreamCreateFile("C:\test.mp3", 0, 0,
                  BASSFlag.BASS_STREAM_DECODE | BASSFlag.BASS_SAMPLE_FLOAT);
            if (stream != 0)
            {
                // assign WASAPI output in shared-mode
                _wasapi = new BassWasapiHandler(-1, false, 48000, 2, 0f, 0f);
                // add the source channel
                _wasapi.AddOutputSource(stream, BASSFlag.BASS_DEFAULT);
                // init and start WASAPI
                _wasapi.Init();
                _wasapi.Start();
            }*/
        }


        private void timer1_Tick(object sender, EventArgs e)
        {

            _spectrumdata.Clear();
            int ret = BassWasapi.BASS_WASAPI_GetData(fft, (int)BASSData.BASS_DATA_FFT2048);
            Console.WriteLine(fft[1024 * 16500 / 44100]);
            if (ret < -1) return;
            int x, y;
            int b0 = 0;


            for (x = 0; x < _lines; x++)
            {
                float peak = 0;
                int b1 = (int)Math.Pow(2, x * 10.0 / (_lines - 1));
                if (b1 > 1023) b1 = 1023;
                if (b1 <= b0) b1 = b0 + 1;
                for (; b0 < b1; b0++)
                {
                    if (peak < fft[1 + b0]) peak = fft[1 + b0];
                }
                y = (int)(Math.Sqrt(peak) * 3 * 255 - 4);
                if (y > 255) y = 255;
                if (y < 0) y = 0;
                _spectrumdata.Add((byte)y);
            }
            Console.Clear();
            foreach(byte data in _spectrumdata)
            {
                Console.Write("[");
                for(int i = 0; i < data; i += 4)
                {
                    Console.Write("=");
                }
                Console.Write("]\n");
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            for (int i = 0; i < BassWasapi.BASS_WASAPI_GetDeviceCount(); i++)
            {
                var device = BassWasapi.BASS_WASAPI_GetDeviceInfo(i);
                if (device.IsEnabled && device.IsLoopback)
                {
                    comboBox1.Items.Add(string.Format("{0} - {1}", i, device.name));
                }
            }
            comboBox1.SelectedIndex = 0;
            Bass.BASS_SetConfig(BASSConfig.BASS_CONFIG_UPDATETHREADS, false);
            Bass.BASS_Init(0, 44100, BASSInit.BASS_DEVICE_DEFAULT, IntPtr.Zero);
            wasapiProcess = new WASAPIPROC(wasapiProcessHack);
        }

        private int wasapiProcessHack(IntPtr buffer, int length, IntPtr user)
        {
            return length;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            _wasapi.Stop();
        }
    }
}