using jnsoft.Helpers;
using System;
using System.Collections.Generic;
using System.Linq;

namespace jnsoft.MDF.Examples.Reader
{
  /// <summary>
  /// MDF Reader example.
  ///
  /// - Loading an MDF file
  /// - Read data as raw data samples.
  /// - Iterating over measurement data
  ///
  /// Usage: ASAP2MDFReaderExample MDFFile.mdf
  /// </summary>
  class Program
  {
    /// <summary>
    /// Main function.
    /// </summary>
    /// <param name="args">The commandline arguments</param>
    /// <returns>Console application exitcode (0 if successful)</returns>
    static int Main(string[] args)
    {
      if (args.Length != 1)
      { // no args -> present usage
        Console.WriteLine($"{Extensions.AppName}({Extensions.AppVersion})");
        Console.WriteLine("\\t- Read raw data samples from a MDF file...");
        Console.WriteLine("\\t- Read and display physical measurement data from a MDF file...");
        Console.WriteLine("Required input: An MDF (measurement data format) file");
        Console.WriteLine("$Usage: {Application.ProductName} MDFFile.mdf");
        Console.WriteLine("$Example: {Application.ProductName} MDFExample.mdf");
        return -1;
      }

      try
      { // Open specified MDF file
        using (var mdfFile = MDFReader.open(args[0]))
        {
          Console.WriteLine($"Timeline: {mdfFile.getLength()} seconds, {mdfFile.getSamplePointCount():N0} sample points");

          var channels = new List<ICNBLOCK>(mdfFile.OpenChannels);
          var channel = channels.FirstOrDefault(x => x.ChannelType == ChannelType.Data && x.SignalType < SignalType.STRING);

          Console.WriteLine($"First data channel contains {channel.CGBlock.RecordCount} records.");
          var firstUnit = string.IsNullOrEmpty(channel.Unit) ? string.Empty : $" {channel.Unit}";

          // Iterate samples over a single data channel for the first 1.4 seconds
          foreach (var sample in mdfFile.enumSamples(channel, ValueObjectFormat.Physical, 0, 1.4))
            Console.WriteLine($"Channel = {channel.Name}: Time {sample.X}[s]={sample.Y}{firstUnit}");
          Console.WriteLine();

          // Iterate raw data samples over a single data channel for the first 1.4 seconds
          IList<RawDataRecord> rawData; DataLimits rawLimitX;
          if (!mdfFile.getRawData(0, 1.4, channel, out rawData, out rawLimitX))
            // failed to read raw data
            return -2;
          foreach(var entry in rawData)
            Console.WriteLine($"Channel = {channel.Name}(Raw data): Time {entry.Timestamp}[s]={BitConverter.ToString(entry.Data)}");
          Console.WriteLine();

          // read all samples as physical values from the first 1.4 seconds
          foreach (var group in mdfFile.OpenChannelGroups)
          {
            if (!mdfFile.getData(group, out double[][] data, ValueObjectFormat.Physical, 0, 1.4))
              // no data available
              continue;

            var time = data[0];
            var sampleCnt = time.Length;
            for (int chnIdx = 1; chnIdx < group.CNBlocks.Count; ++chnIdx)
            { // iterate over data channels
              channel = group.CNBlocks[chnIdx];
              var unit = string.IsNullOrEmpty(channel.Unit) ? string.Empty : $" {channel.Unit}";
              for (int i = 0; i < sampleCnt; ++i)
                Console.WriteLine($"Channel = {channel.Name}: Time {time[i]}[s]={data[chnIdx][i]}{unit}");
            }
          }
        }
        return 0;
      }
      catch (Exception ex)
      {
        Console.WriteLine($"Something failed, file not found or unsupported\\n{ex.Message}");
        return -2;
      }
    }
  }
}