using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using Newtonsoft.Json;

namespace SkyboxVR_Sorter
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("This program will sort all videos in SkyboxVR by download / file creation date.");
            Console.WriteLine("Optional: Use argument to supply the SkyboxVR cache file:\nSkyboxVRSorter.exe \"file_path_to_SkyboxVR_media.json\"");
            Console.WriteLine("press any key to continue...");

            Console.ReadLine();

            //string skyboxVrCacheFileLocation = @"C:\Users\tino\AppData\Roaming\SKYBOX\data\cache.dat";
            string skyboxVrCacheFileLocation = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) + @"\SKYBOX\data\media.json";

            if (args.Length > 0 && !string.IsNullOrEmpty(args[0]))
            {
                Console.WriteLine("Found provided argument.");
                skyboxVrCacheFileLocation = args[0];
            }

            Console.WriteLine("");
            Console.WriteLine("Using Skybox VR cache: " + skyboxVrCacheFileLocation);
            Console.WriteLine("");

            if (!File.Exists(skyboxVrCacheFileLocation))
            {
                Console.WriteLine("File does not exist: " + skyboxVrCacheFileLocation);
                Environment.Exit(0);
            }

            File.SetAttributes(skyboxVrCacheFileLocation, FileAttributes.Normal);
            string cache = File.ReadAllText(skyboxVrCacheFileLocation);
            Root vrCache = JsonConvert.DeserializeObject<Root>(cache);
            Console.WriteLine("DeserializeObject cache successfull. Number of videos: " + vrCache.children.Count);

            Console.WriteLine("Checking file attributes and changing json in memory ...");
            Console.WriteLine("0 %");
            int countVids = 0;

            List<Child> children = FixTimeAddedForVideos(vrCache.children);
            vrCache.children = children;

            Console.WriteLine("");

            Console.WriteLine("Ready to write Skybox VR cache back to file.\n!!! CLOSE SKYBOX VR !!! and press Enter");
            Console.ReadLine();
            string newJsonCache = JsonConvert.SerializeObject(vrCache);
            File.WriteAllText(skyboxVrCacheFileLocation, newJsonCache);
            Console.WriteLine("Wrote json file.");
            Console.WriteLine("All done - have fun wanking!");

            Console.ReadLine();
        }

        public static int countVids = 0;

        public static List<Child> FixTimeAddedForVideos(List<Child> children)
        {
            for (int i = 0; i < children.Count; i++)
            {
                Console.SetCursorPosition(Console.CursorLeft, Console.CursorTop - 1);
                Console.WriteLine(countVids+" videos done");

                if (children[i].type == "Folder")
                {
                    List<Child> folderChildren = FixTimeAddedForVideos(children[i].children);
                    children[i].children = folderChildren;
                }
                else if (children[i].type == "Video")
                {
                    long timeForFile = GetUnixTimeForFile(children[i].path);
                    if(timeForFile > 0)
                    {
                        children[i].added_time = timeForFile;
                        countVids++;
                    }
                }
                else
                {
                    Console.WriteLine("Error! Dont know the type " + children[i].type);
                }
            }
            return children;
        }

        public static long GetUnixTimeForFile(string filePath)
        {
            try
            {
                string videoFilePath = filePath;
                if (!File.Exists(videoFilePath))
                {
                    Console.WriteLine("Couldn't find/access video: " + videoFilePath);
                    return -1;
                }
                DateTime creationTime = File.GetCreationTime(videoFilePath);
                long creationTimeUnix = Convert.ToInt64(DateTimeToUnixTimestamp(creationTime));
                return creationTimeUnix;
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                return -1;
            }
        }

        public static DateTime UnixTimestampToDateTime(double unixTime)
        {
            DateTime unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
            long unixTimeStampInTicks = (long) (unixTime * TimeSpan.TicksPerSecond);
            return new DateTime(unixStart.Ticks + unixTimeStampInTicks, System.DateTimeKind.Utc);
        }

        public static double DateTimeToUnixTimestamp(DateTime dateTime)
        {
            DateTime unixStart = new DateTime(1970, 1, 1, 0, 0, 0, 0, System.DateTimeKind.Utc);
            long unixTimeStampInTicks = (dateTime.ToUniversalTime() - unixStart).Ticks;
            return (double) unixTimeStampInTicks / TimeSpan.TicksPerSecond;
        }
    }
}