using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.IO;
using System.Text.RegularExpressions;
using ZennoLab.CommandCenter;
using ZennoLab.InterfacesLibrary;
using ZennoLab.InterfacesLibrary.ProjectModel;
using ZennoLab.InterfacesLibrary.ProjectModel.Collections;
using ZennoLab.InterfacesLibrary.ProjectModel.Enums;
using ZennoLab.Macros;
using Global.ZennoExtensions;
using ZennoLab.Emulation;
using YoutubeExplode;
using YoutubeExplode.Models;
using Tyrrrz.Extensions;
using System.Threading.Tasks;


namespace YoutubeDownloader
{
    public static class YouTube
    {

        private static string NormalizeId(string input)
        {
            string id = "";
            if (!YoutubeClient.TryParseVideoId(input, out id))
            return id;
        }

        /// <summary>
        /// Turns file size in bytes into human-readable string
        /// </summary>
        private static string NormalizeFileSize(long fileSize)
        {
            string[] units = { "B", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB" };
            double size = fileSize;
            int unit = 0;

            while (size >= 1024)
            {
                size /= 1024;
                ++unit;
            }

            return "{size:0.#} {units[unit]}";
        }

private static async Task MainAsync()
        {
            // Client
            var client = new YoutubeClient();

            // Get the video ID
            string id = "https://www.youtube.com/watch?v=rW2ay4RVVnI";
            id = NormalizeId(id);

            // Get the video info
            var videoInfo = await client.GetVideoInfoAsync(id);


            // Get the most preferable stream
            var streamInfo = videoInfo.MixedStreams
                .OrderBy(s => s.VideoQuality)
                .Last();
            string normalizedFileSize = NormalizeFileSize(streamInfo.ContentLength);

            // Compose file name, based on metadata
            string fileExtension = streamInfo.Container.GetFileExtension();
            string fileName = "{videoInfo.Title}.{fileExtension}";

            // Remove illegal characters from file name
            fileName = fileName.Except(Path.GetInvalidFileNameChars());


            await client.DownloadMediaStreamAsync(streamInfo, fileName);
        }
    }
}