using System;
using System.IO;
using TwitterVB2; // from http://twittervb.codeplex.com/  Note: To build, I had go to Project->microSpeak140 properties->Application and select the target framework of .NET 3.0 (i.e., not the default 4.0), and then it built (then put it back to 4.0).

class Speak140
{
    // To make this program work, I went to https://dev.twitter.com/apps/, and got my own Consumer Key and Secret:
    string ConsumerKey  = replace this with what you got off the Twitter site
    string ConsumerSecret  = replace this with what you got off the Twitter site
    string fName = string.Empty;
    string userToken = string.Empty;
    string userSecret = string.Empty;
    TwitterAPI twitter140 = null;
    bool LoggedOn = false;

    /// <summary>
    /// A file can be specified which will store the credentials
    /// </summary>
    public Speak140(bool autoLogon = true, string userFile = "microSpeak140.txt")
    {
        LoggedOn = false;
        twitter140 = new TwitterAPI();
        fName = userFile;
        if (autoLogon)
            Logon();
    }

    /// <summary>
    /// Open fName and read the user's credentials (if the file exists), else send user to a twitter page 
    ///      to get a 7-Digit PIN which we then use to get and save their credentials (we write to fName)
    /// </summary>
    public bool Logon()
    {
        bool success = false;
        bool promptUser = false;
        if (File.Exists(fName))
        {
            try
            {
                userToken = string.Empty;
                userSecret = string.Empty;
                StreamReader mFile = new StreamReader(fName);
                userToken = mFile.ReadLine();
                userSecret = mFile.ReadLine();
                if (userToken != null && userSecret != null && userToken != string.Empty && userSecret != string.Empty)
                    twitter140.AuthenticateWith(ConsumerKey, ConsumerSecret, userToken, userSecret);
                else
                    promptUser = true;
                mFile.Close();
                success = true;
            }
            catch
            {
                promptUser = true;
            }
        }
        else
            promptUser = true;

        if (promptUser)
        {
            string PIN = PromptUserForPIN();
            if (PIN != String.Empty)
            {
                if (twitter140.ValidatePIN(PIN))
                {
                    userToken = twitter140.OAuth_Token;
                    userSecret = twitter140.OAuth_TokenSecret;
                    twitter140.AuthenticateWith(ConsumerKey, ConsumerSecret, userToken, userSecret);
                    success = true;
                    if (File.Exists(fName))
                        File.Delete(fName);
                    StreamWriter mFile = new StreamWriter(fName);
                    mFile.WriteLine(userToken);
                    mFile.WriteLine(userSecret);
                    mFile.Close();
                }
                else
                    Console.WriteLine("Could not authenticate PIN {0}.", PIN);
            }
            else
                Console.WriteLine("You did not enter a valid PIN");
        }
        LoggedOn = success;
        return success;
    }

    /// <summary>
    /// If the user has not registered with us before, we'll ask them to go to the twitter web site and get a 7-digit key
    /// </summary>
    string PromptUserForPIN()
    {
        string PIN = string.Empty;
        Console.WriteLine("Step 1: Go here, " + twitter140.GetAuthenticationLink(ConsumerKey, ConsumerSecret));
        Console.Write("Step 2: Enter the 7-Digit PIN> ");
        PIN = Console.ReadLine();
        return PIN;
    }

    /// <summary>
    /// Say what's on your mind. We'll publish it to twitter if it is less than 140 characters.
    /// </summary>
    public bool Say(string message, bool confirmBeforeSend=true)
    {
        Console.WriteLine("Sending: " + message);
        if (message.Length > 140)
        {
            Console.WriteLine("         Contains {0} too many characters.", message.Length - 140);
            return false;
        }
        if (message.Length < 140)
            Console.WriteLine("         {0} unused characters; you can write more.", 140 - message.Length);
        else
            Console.WriteLine("         140 character limit reached.");

        if (LoggedOn)
        {
            bool send = true;
            if (confirmBeforeSend == true)
            {
                Console.WriteLine();
                Console.Write("Press the Y-key to post this, any other key to abort>");
                ConsoleKeyInfo ci = Console.ReadKey();
                send = (ci.KeyChar == 'y' || ci.KeyChar == 'Y');
                Console.WriteLine();
            }
            if (send)
            {
                TwitterStatus s = twitter140.Update(message);
                Console.WriteLine("Posted: {0}, length {1}", s.Text, s.Text.Length);
            }
            else
                Console.WriteLine("Aborted. Nothing posted.");
        }
        else
            Console.WriteLine("You are not authenticated.  Consider deleting your credentials file: {0}", fName);
        return true;
    }

    public bool myWall(int count=0)
    {
        bool ret = false;
        if (LoggedOn)
        {
            int ct = 1;            
            foreach (TwitterStatus tweet in twitter140.HomeTimeline())
            {
                Console.WriteLine(tweet.User.ScreenName + " : " + tweet.CreatedAt + " : " + tweet.Text);
                if (ct == count && count > 0)
                    break;
                ct++;
            }
        }
        return ret;
    }

    /// <summary>
    /// Show the status of the given person
    /// </summary>
    /// <param name="name">name of person</param>
    /// <param name="count">number of posts to show</param>
    /// <returns></returns>
    public string theirWall(string name, int count=0)
    {
        string ret = null;
        if (LoggedOn)
        {
            int ct = 1;
            foreach (TwitterStatus tweet in twitter140.UserTimeline(name))
            {
                Console.WriteLine(tweet.User.ScreenName + " : " + tweet.CreatedAt + " : " +  tweet.Text);
                ret = tweet.Text;
                if (ct == count && count > 0)
                    break;
                ct++;
            }
        }
        return ret;
    }

    public bool iFollow()
    {
        bool ret = false;
        if (LoggedOn)
        {
            foreach (TwitterUser user in twitter140.Friends())
                Console.WriteLine(user.ScreenName);
        }
        return ret;
    }

    public bool followMe()
    {
        bool ret = false;
        if (LoggedOn)
        {
            foreach (TwitterUser user in twitter140.Followers())
                Console.WriteLine(user.ScreenName);
        }
        return ret;
    }

}