using LASFormat;
using LASRead.LASFormat;
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;

namespace LASRead
{
    public class RawPoints
    {
        // Creates a raw point cloud from a LAS file input.
        LASFile source;
        FileStream output;

        public RawPoints(LASFile source, FileStream output)
        {
            this.source = source;
            this.output = output;
        }

        public void Run()
        {
            GenerateHeader();
            byte[] tData = new byte[12];
            foreach (IPointDataRecord pdr in source.points)
            {
                byte[] t = BitConverter.GetBytes(pdr.X);
                t.CopyTo(tData, 0);
                t = BitConverter.GetBytes(pdr.Y);
                t.CopyTo(tData, 4);
                t = BitConverter.GetBytes(pdr.Z);
                t.CopyTo(tData, 8);
                output.Write(tData);
            }
            output.Flush();
            output.Close();
        }
        /// <summary>
        /// Header is 24 bytes (3 doubles)
        /// </summary>
        private void GenerateHeader()
        {
            byte[] finalBytes = new byte[24];
            double x_scale = source.Header.X_scaleFactor;
            double y_scale = source.Header.Y_scaleFactor;
            double z_scale = source.Header.Z_scaleFactor;

            byte[] t = BitConverter.GetBytes(x_scale);
            t.CopyTo(finalBytes, 0);
            t = BitConverter.GetBytes(y_scale);
            t.CopyTo(finalBytes, 8);
            t = BitConverter.GetBytes(z_scale);
            t.CopyTo(finalBytes, 16);

            output.Write(finalBytes);
        }
    }
}