//
// Copyright (c) 2008, Brian Frank and Andy Frank
//
// History:
//   2 Apr 08  Andy Frank  Creation
//

function User() {}

/**
 * Focus username field.
 */
User.focusUsername = function()
{
  var elem = $("#username");
  if (elem != null) elem.focus();
}
$(document).ready(User.focusUsername);

//////////////////////////////////////////////////////////////////////////
// Login
//////////////////////////////////////////////////////////////////////////

/**
 * Perform a two-stage login.
 */
User.login = function()
{
  // indicate we're working
  var submit = $("input[type='submit']");
  submit.attr("value", "Logging in...");
  submit.attr("disabled", "disabled");

  // attempt first stage to aquire the salt for this user
  $.ajax({
    type: "POST",
    url:  "/sidewalk/user/?view=sidewalk::LoginView&webappWidgetCall=sidewalk::LoginView.onSalt",
    data: { username: $("#username").val() },
    success: function(salt) { User.authenticate(salt); },
    error:   User.loginError
  });

  // don't submit form
  return false;
}

/**
 * Authenticate credentials.
 */
User.authenticate = function(salt)
{
  var username = $("#username").val();
  var password = $("#password").val();
  var remember = $("#remember").attr("checked");
  var digest = SHA1(username + salt + password);
  $.ajax({
    type: "POST",
    url:  "/sidewalk/user/?view=sidewalk::LoginView&webappWidgetCall=sidewalk::LoginView.onAuthenticate",
    data: { username:username, digest:digest, remember:remember },
    success: function(url) { window.location = (redirect != null) ? redirect : url; },
    error:   User.loginError
  });
}

/**
 * Respond to a login failure.
 */
User.loginError = function(xhr, status, err)
{
  msg = "Failed to authenticate";

  // if already visible, flash, otherwise slide in
  var elem = $("form p.error");
  if (elem.css("display") == "none") elem.text(msg).show("fast");
  else elem.text(msg).fadeTo("fast", 0.5, function() { elem.fadeTo("fast", 1.0) });

  // reset form
  var submit = $("input[type='submit']");
  submit.attr("value", "Login");
  submit.removeAttr("disabled");
  User.focusUsername();
}

//////////////////////////////////////////////////////////////////////////
// Register
//////////////////////////////////////////////////////////////////////////

/**
 * Validate the registration form.
 */
User.validate = function()
{
  // indicate we're working
  var submit = $("input[type='submit']");
  submit.attr("value", "Registering...");
  submit.attr("disabled", "disabled");

  // catch client-side errors first
  var username = $("#username").val();
  var password = $("#password").val();
  var confirm  = $("#confirm").val();
  var valid =
    username.length < 32 &&
    username.length > 2 &&
    username == username.match(/[a-zA-Z][a-zA-Z0-9_]*/);

  if (username == "") User.validateResp("Username required");
  else if (!valid)
  {
    User.validateResp("Invalid username<br/>" +
      "Username may contain only letters,<br/>" +
      "numbers and underscores, and must<br/>" +
      "be between 3-32 characters");
  }
  else if (password == "")      User.validateResp("Password required");
  else if (password != confirm) User.validateResp("Password not confirmed");
  else
  {
    // client looks good, now validate server-side errors
    $.ajax({
      type: "POST",
      url:  "/sidewalk/user/?view=sidewalk::RegisterView&webappWidgetCall=sidewalk::RegisterView.onValidate",
      data: { username: $("#username").val() },
      success: function(salt) { User.register(salt); },
      error:   function() { User.validateResp("Username already taken"); }
    });
  }

  // don't submit form
  return false;
}

/**
 * Handle the validation response.
 */
User.validateResp = function(err)
{
  if (err != null)
  {
    // if already visible, flash
    var elem = $("form p.error");
    if (elem.css("display") == "none") elem.html(err).show("fast");
    else elem.html(err).fadeTo("fast", 0.5, function() { elem.fadeTo("fast", 1.0) });
    User.focusUsername();
  }

  // reset form
  var submit = $("input[type='submit']");
  submit.attr("value", "Register");
  submit.removeAttr("disabled");
}

/**
 * Register the user.
 */
User.register = function(salt)
{
  var username = $("#username").val();
  var password = $("#password").val();
  var digest   = SHA1(username + salt + password);

  $.ajax({
    type: "POST",
    url:  "/sidewalk/user/?view=sidewalk::RegisterView&webappWidgetCall=sidewalk::RegisterView.onRegister",
    data: { username:username, salt:salt, digest:digest },
    success: function(url) { window.location = url; },
    error:   function() { User.validateResp("Register failed"); }
  });
}

//////////////////////////////////////////////////////////////////////////
// UserView
//////////////////////////////////////////////////////////////////////////

User.updateEmailPref = function()
{
  var email  = $("input[name='email']");
  if (email.val() == null) return;

  var send   = $("input[name='send']");
  var policy = $("select[name='policy']");
  var filter = $("select[name='filter']");

  if (email.val().length == 0)
  {
    send.attr("disabled", "disabled");
    policy.attr("disabled", "disabled");
    filter.attr("disabled", "disabled");
  }
  else
  {
    send.removeAttr("disabled");
    if (send.attr("checked"))
    {
      policy.removeAttr("disabled");
      filter.removeAttr("disabled");
    }
    else
    {
      policy.attr("disabled", "disabled");
      filter.attr("disabled", "disabled");
    }
  }
}
$(document).ready(User.updateEmailPref);

//////////////////////////////////////////////////////////////////////////
// ChangePasswordView
//////////////////////////////////////////////////////////////////////////

/**
 * Validate the new password and change it.
 */
User.changePassword = function()
{
  // indicate we're working
  var submit = $("input[type='submit']");
  submit.attr("value", "Changing password...");
  submit.attr("disabled", "disabled");

  // catch client-side errors first
  var username = $("#username").val();
  var salt     = $("#salt").val();
  var password = $("#password").val();
  var confirm  = $("#confirm").val();

  if (password == "")           User.changePasswordResp("Password required");
  else if (password != confirm) User.changePasswordResp("Password not confirmed");
  else
  {
    // password confirmed, update password
    var digest = SHA1(username + salt + password);
    $.ajax({
      type: "POST",
      url:  "/sidewalk/user/" + $("#userid").val()
        + "?view=sidewalk::ChangePasswordView&webappWidgetCall=sidewalk::ChangePasswordView.onChangePassword",
      data: { digest:digest },
      success: function(url) { window.location = url; },
      error:   function() { User.changePasswordResp("Change password failed"); }
    });
  }

  // don't submit form
  return false;
}

/**
 * Handle the change password response.
 */
User.changePasswordResp = function(err)
{
  if (err != null)
  {
    // if already visible, flash
    var elem = $("form p.error");
    if (elem.css("display") == "none") elem.html(err).show("fast");
    else elem.html(err).fadeTo("fast", 0.5, function() { elem.fadeTo("fast", 1.0) });
    User.focusUsername();
  }

  // reset form
  var submit = $("input[type='submit']");
  submit.attr("value", "Change Password");
  submit.removeAttr("disabled");
}