using NAudio.Wave;
using SongVocalSectionAnalyser.AudioAnalysis;
using SongVocalSectionAnalyser.Common;
using SongVocalSectionAnalyser.UI;
using System;
using System.IO;
using System.Windows.Forms;

namespace SongVocalSectionAnalyser
{
    public partial class MainForm : Form
    {
        //Manual PreProcess: vocal isolate by invert instrumental ver.
        //Load and parse audio file
        //Split audio sample data by 10ms chunks
        //Extract volume from every chunk
        //Extract MA from continuous per 10 chunks
        //Debouncing chunks by threshold and
        //Looking chunks segment continuous by threshold

        public MainForm()
        {
            InitializeComponent();
        }

        private SongData _songData;
        private WaveOut _waveOut;

        private void LoadButton_Click(object sender, System.EventArgs e)
        {
            var filePath = FilePathTextBox.Text;
            if (string.IsNullOrEmpty(filePath)) throw new InvalidOperationException("File path are required");

            var fileExtension = Path.GetExtension(filePath);

            Func<string, int, float, int, int, SongData> loaderFunc;
            switch (fileExtension.TrimStart('.').ToUpper())
            {
                case "MP3":
                    loaderFunc = SongLoader.LoadFromMp3File;
                    break;

                case "WAV":
                    loaderFunc = SongLoader.LoadFromWavFile;
                    break;

                default: throw new NotSupportedException("File extension no supported");
            }
            _songData = loaderFunc(filePath, (int)MsPerChunkUpDown.Value, (float)ChunkThresholdUpDown.Value, (int)ChunkDebounceUpDown.Value, (int)ChunksPerMaUpDown.Value);
            MainChart.SetData(_songData);
        }

        private void ReChunkButton_Click(object sender, EventArgs e)
        {
            _songData = new SongData(_songData, (int)MsPerChunkUpDown.Value, (float)ChunkThresholdUpDown.Value, (int)ChunkDebounceUpDown.Value, (int)ChunksPerMaUpDown.Value);
            MainChart.SetData(_songData);
        }

        private void ReBuildChartButton_Click(object sender, EventArgs e)
        {
            MainSplitContainer.Panel1.Controls.Remove(MainChart);
            MainChart.Dispose();
            MainChart = new InteractiveChart
            {
                Dock = DockStyle.Fill
            };

            MainSplitContainer.Panel1.Controls.Add(MainChart);
            MainChart.SetData(_songData);
            MainChart.TimelineClicked += MainChart_TimelineClicked;
        }

        private void MainChart_TimelineClicked(TimeSpan arg1, ChunkGroup arg2)
        {
            RightRichTextBox.AppendText($"Timeline Clicked pos[{arg1.ToStringH2M2S2F2()}] group[{arg2.Begin.ToStringH2M2S2F2()}]-[{arg2.End.ToStringH2M2S2F2()}]{Environment.NewLine}");

            _waveOut?.Dispose();
            _waveOut = new WaveOut();

            var songDataWaveProvider = PlayChunkRadioButton.Checked
                ? new SongDataWaveProvider(_songData, arg2.Begin, arg2.End)
                : new SongDataWaveProvider(_songData, arg1);

            songDataWaveProvider.Playing+= i => Invoke(new Action(() => MainChart.PlayingSample = i));

            _waveOut.Init(songDataWaveProvider);
            _waveOut.Play();
        }

        private void StopPlayButton_Click(object sender, EventArgs e)
        {
            _waveOut?.Dispose();
            MainChart.PlayingSample = null;
        }
    }
}