WIP

src/SnagitImgur/Dialogs/AccountForm.cs

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+using System;
+using System.Diagnostics;
+using System.Windows.Forms;
+using SnagitImgur.Properties;
+
+namespace SnagitImgur.Dialogs
+{
+    public partial class AccountForm : Form
+    {
+        private readonly OAuthHelper oauthHelper;
+
+        public AccountForm(OAuthHelper oauthHelper)
+        {
+            this.oauthHelper = oauthHelper;
+
+            InitializeComponent();
+        }
+
+        private void AccountFormLoad(object sender, EventArgs e)
+        {
+            if (oauthHelper.IsAuthenticated)
+            {
+                ShowAccountDetails();
+            }
+        }
+
+        private void ShowAccountDetails()
+        {
+            lblAccountName.Text = oauthHelper.GetAccountName();
+            btnAuthenticate.Text = "&Sign Out";
+            btnAuthenticate.Tag = "sign_out";
+        }
+
+        private void btnAuthenticate_Click(object sender, EventArgs e)
+        {
+            string tag = (string)btnAuthenticate.Tag;
+            switch (tag)
+            {
+                case "sign_out":
+                    oauthHelper.SignOut();
+                    ShowAccountDetails();
+                    break;
+                case "auth":
+                    oauthHelper.OpenAuthorizationPage();
+                    ShowPinCodePrompt();
+                    break;
+            }
+        }
+
+        private void ShowPinCodePrompt()
+        {
+            using (var pinCodeForm = new PinCodeForm(oauthHelper))
+            {
+                if (pinCodeForm.ShowDialog() == DialogResult.OK)
+                {
+                    ShowAccountDetails();
+                }
+            }
+        }
+    }
+
+    public class OAuthHelper
+    {
+        private readonly Settings settings;
+        private const string clientId = "d9c6c0bfd99b470";
+        private const string clientSecret = "";
+
+        public bool IsAuthenticated
+        {
+            get { return false; }
+        }
+
+        public string OAuthUrl { get; private set; }
+
+        public OAuthHelper(Settings settings)
+        {
+            this.settings = settings;
+            OAuthUrl = string.Format("https://api.imgur.com/oauth2/authorize?client_id={0}&response_type=pin&state=", clientId);
+        }
+
+
+        public string GetAccountName()
+        {
+            throw new NotImplementedException();
+        }
+
+        public void Authenticate(string pin)
+        {
+
+        }
+
+        public void SignOut()
+        {
+            throw new NotImplementedException();
+        }
+
+        public void OpenAuthorizationPage()
+        {
+            Process.Start(OAuthUrl);
+        }
+    }
+}