/*
    Компиляция:
    - Идём в C:\WINDOWS\Microsoft.NET\Framework, выбираем версию фреймфорка
      выше или равную v3.5. Смотрим, чтобы в папке был csc.exe.
    - Открываем консоль, пишем SET PATH=%PATH%;C:\WINDOWS\Microsoft.NET\Framework\версия
    - Идём в папку с исходником.
    - Говорим csc имяисходника.cs
    - Говорим имяисходника.exe, дальше понятно.
*/

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Net;
using System.Text;

static class FaceAppCLI
{
    public static void Main(string[] args)
    {
        if (args.Length != 3)
        {
            System.Console.WriteLine("Wrong args. Usage: <input file> <filter> <output file>");
            System.Console.WriteLine("Filters: smile, smile_2, hot, old, young, female, male");
            return;
        }
        string inputFile = args[0];
        string filter = args[1];
        string outputFile = args[2];

        FaceAppClient client = new FaceAppClient();
        try
        {
            string code = client.UploadImage(inputFile);
            Image img = client.GetImage(code, filter);
            img.Save(outputFile);
        }
        catch (WebException)
        {
            System.Console.WriteLine("Something went wrong!");
        }
    }
}

class FaceAppClient
{
    private const string FA_BASE_URL = "https://node-01.faceapp.io/api/v2.3/photos";

    private const string FA_FILTER = "/{0}/filters/{1}?cropped={2}";

    private const string FA_PREIMAGE = "--{0}\r\nContent-Disposition: form-data; name=\"file\"; filename=\"image.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";

    private const string FA_POSTIMAGE = "--{0}--";

    private const string UA = "FaceApp/1.0.229 (Linux; Android 4.4)";

    private string awselbCookie = string.Empty;

    private string xFaceAppDeviceId = string.Empty;

    private string guid = string.Empty;

    public FaceAppClient()
    {
        Random random = new Random();
        for (int i = 0; i < 4; i++)
        {
            this.xFaceAppDeviceId += Convert.ToString(random.Next(4096, 65535), 16);
        }
        this.guid = Guid.NewGuid().ToString();
    }

    public string UploadImage(string fileName)
    {
        string result;
        try
        {
            List<byte> list = new List<byte>();
            list.AddRange(Encoding.ASCII.GetBytes(string.Format("--{0}\r\nContent-Disposition: form-data; name=\"file\"; filename=\"image.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n", this.guid)));
            byte[] imageBytes = File.ReadAllBytes(fileName);
            list.AddRange(imageBytes);
            list.AddRange(Encoding.ASCII.GetBytes(string.Format("--{0}--", this.guid)));
            imageBytes = list.ToArray();
            HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create("https://node-01.faceapp.io/api/v2.3/photos");
            httpWebRequest.Method = "POST";
            httpWebRequest.UserAgent = "FaceApp/1.0.229 (Linux; Android 4.4)";
            httpWebRequest.ContentType = string.Format("multipart/form-data; boundary={0}", this.guid);
            httpWebRequest.Headers.Add("X-FaceApp-DeviceID", this.xFaceAppDeviceId);
            httpWebRequest.KeepAlive = true;
            httpWebRequest.SendChunked = true;
            httpWebRequest.Timeout = 25000;
            BinaryWriter binaryWriter = new BinaryWriter(httpWebRequest.GetRequestStream());
            binaryWriter.Write(imageBytes);
            binaryWriter.Close();
            HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            string responseHeader = httpWebResponse.GetResponseHeader("Set-Cookie");
            long contentLength = httpWebResponse.ContentLength;
            StreamReader streamReader = new StreamReader(httpWebResponse.GetResponseStream());
            string text = streamReader.ReadToEnd();
            if (contentLength != 29L || !text.Contains("code") || !responseHeader.StartsWith("AWSELB"))
            {
                throw new Exception("UploadImage() got the following answer from the server: " + text);
            }
            if (this.awselbCookie == string.Empty)
            {
                this.awselbCookie = responseHeader.Substring(7, responseHeader.IndexOf(';') - 7);
            }
            result = text.Substring(9, 18);
        }
        catch (Exception)
        {
            result = string.Empty;
        }
        return result;
    }

    public Image GetImage(string code, string filter)
    {
        string requestUriString = "https://node-01.faceapp.io/api/v2.3/photos" + string.Format("/{0}/filters/{1}?cropped={2}", code, filter, (filter == "male" || filter == "female") ? "1" : "0");
        HttpWebRequest httpWebRequest = (HttpWebRequest)WebRequest.Create(requestUriString);
        httpWebRequest.Headers.Add("X-FaceApp-DeviceID", this.xFaceAppDeviceId);
        httpWebRequest.UserAgent = "FaceApp/1.0.229 (Linux; Android 4.4)";
        HttpWebResponse httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        return new Bitmap(httpWebResponse.GetResponseStream());
    }
}