using System;
using System.Collections;
using System.IO;
using System.Reflection;
using System.Runtime.CompilerServices;
using LASFormat;
using LASRead;
using LASRead.LASFormat;
using Microsoft.CSharp.RuntimeBinder;

namespace LasInteractor
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("LAS Interactor. Provides methods to interact with .las files.");
            Console.WriteLine("(c) 2020 Brychan Dempsey.\n.las Format (c) 2002-2019 American Society for Photogrammetry and Remote Sensing (ASPRS)\n");
            Console.WriteLine("This software is intended for testing purposes only.");
            Console.WriteLine("Currently, it is only compatible with processors that work in Little-Endian byte orders. Your system is {0} LE.\n", BitConverter.IsLittleEndian ? "" : "not");
            Console.WriteLine("Enter a mode:");
            Console.WriteLine("r - read a .las file");
            Console.WriteLine("g - generate a .las file");
            Console.WriteLine("c - collects the points into xyz format");
            Console.WriteLine("z - compress via 7zip (experimental)");
            ConsoleKeyInfo c = Console.ReadKey();
            while(c.Key != ConsoleKey.Q)
            {
                if (c.Key == ConsoleKey.R)
                {
                    Console.WriteLine("Read a file mode selected.\nPrint full data to console? (Y/n)");
                    c = Console.ReadKey();
                    while (c.Key != ConsoleKey.Y && c.Key != ConsoleKey.N)
                    {
                        Console.WriteLine("Please enter Y/n");
                        c = Console.ReadKey();
                    }
                    Console.WriteLine("Enter the full file path:");
                    string path = Console.ReadLine();
                    ReadFile(path, c.Key == ConsoleKey.Y);
                }

                c = Console.ReadKey();
            }


        }

        private static void ReadFile(string source, bool printAll)
        {
            Console.WriteLine("Reading {0}", source);
            FileStream fs = File.OpenRead(source.Trim('\"'));
            Console.WriteLine("File is {0} bytes", fs.Length);
            LASFile lasFile = new LASFile(fs);
            /*FileStream os = File.OpenWrite("tdata.dat");
            RawPoints rp = new RawPoints(lasFile, os);
            rp.Run(); */
            Console.WriteLine(new string('/', 20));
            Console.Write(new string('/', 6));
            Console.Write(" Header ");
            Console.WriteLine(new string('/', 6));
            Console.WriteLine(new string('/', 20));
            Console.Write(lasFile.Header.ToString());
            Console.WriteLine(new string('/', 20));
            if (printAll)
            {
                Console.WriteLine("VLRs:");
                Console.WriteLine("press enter to continue (q breaks the loop)");
                Console.ReadLine();
                foreach (Record record in lasFile.vlrCollection)
                {
                    Console.WriteLine(record.ToString());
                    string s = Console.ReadLine();
                    if (s.Equals("q")) break;
                }
                Console.WriteLine("PDRs:");
                Console.WriteLine("press enter to continue (q breaks the loop)");
                Console.ReadLine();
                byte lastClass = 0;
                foreach (IPointDataRecord pdr in lasFile.points)
                {
                    if (pdr.Classification == lastClass)
                    {
                        continue;
                    }
                    else
                    {
                        Console.WriteLine(pdr.ToString());
                        lastClass = pdr.Classification;
                        // Generics abuse
                        // Searches points for the method GetEnumerator() (of PDRCollection<T>), then searches the returned PDREnumerator<T> for EstimateRemainder()
                        dynamic underlyingeEnumerator = lasFile.points.GetType().GetMethod("GetEnumerator").Invoke(lasFile.points, null);
                        string estimation = ((int)underlyingeEnumerator.GetType().GetMethod("EstimateRemainder").Invoke(underlyingeEnumerator, null)).ToString();

                        Console.WriteLine(estimation); //.GetEnumerator().EstimateRemainder());
                        string s = Console.ReadLine();
                        if (s.Equals("q")) break;
                    }


                }
                Console.WriteLine("EVLRs:");
                Console.WriteLine("press enter to continue (q breaks the loop)");
                Console.ReadLine();
                foreach (Record record in lasFile.evlrCollection)
                {
                    Console.WriteLine(record.ToString());
                    string s = Console.ReadLine();
                    if (s.Equals("q")) break;
                }
            }
            else
            {
                Console.WriteLine("Number of VLRs:");
                Console.WriteLine(lasFile.Header.NumberVLRs);
                Console.WriteLine("Number of PDRs:");
                Console.WriteLine(Math.Max(lasFile.Header.LegacyNumberOfPointRecords, lasFile.Header.NumberPointRecords));
                if (lasFile.Header.VersionMajor >= 1 && lasFile.Header.VersionMinor >= 4)
                {
                    Console.WriteLine("Number of Extended VLRs:");
                    Console.WriteLine(lasFile.Header.NumberOfExtendedVLRs);
                }
                else
                {
                    Console.WriteLine("File Version is < v1.4. No additional data");
                }
                

            }

        }

        void GenerateLAS()
        {
            Stream s = new MemoryStream(); // Use a memory stream to save the enumerables. Copy the stream if needed
            // Create a 163.84 * 163.84 * 163.84 grid
            LASFile lasFile = new LASFile(s);
        }
    }
}