this is a really good first commit

lib/something_erlang_web/live/user_settings_live.ex

@@ -0,0 +1,161 @@
+defmodule SomethingErlangWeb.UserSettingsLive do
+  use SomethingErlangWeb, :live_view
+
+  alias SomethingErlang.Accounts
+
+  def render(assigns) do
+    ~H"""
+    <.header>Change Email</.header>
+
+    <.simple_form
+      :let={f}
+      id="email_form"
+      for={@email_changeset}
+      phx-submit="update_email"
+      phx-change="validate_email"
+    >
+      <.error :if={@email_changeset.action == :insert}>
+        Oops, something went wrong! Please check the errors below.
+      </.error>
+
+      <.input field={{f, :email}} type="email" label="Email" required />
+
+      <.input
+        field={{f, :current_password}}
+        name="current_password"
+        id="current_password_for_email"
+        type="password"
+        label="Current password"
+        value={@email_form_current_password}
+        required
+      />
+      <:actions>
+        <.button phx-disable-with="Changing...">Change Email</.button>
+      </:actions>
+    </.simple_form>
+
+    <.header>Change Password</.header>
+
+    <.simple_form
+      :let={f}
+      id="password_form"
+      for={@password_changeset}
+      action={~p"/users/log_in?_action=password_updated"}
+      method="post"
+      phx-change="validate_password"
+      phx-submit="update_password"
+      phx-trigger-action={@trigger_submit}
+    >
+      <.error :if={@password_changeset.action == :insert}>
+        Oops, something went wrong! Please check the errors below.
+      </.error>
+
+      <.input field={{f, :email}} type="hidden" value={@current_email} />
+
+      <.input field={{f, :password}} type="password" label="New password" required />
+      <.input field={{f, :password_confirmation}} type="password" label="Confirm new password" />
+      <.input
+        field={{f, :current_password}}
+        name="current_password"
+        type="password"
+        label="Current password"
+        id="current_password_for_password"
+        value={@current_password}
+        required
+      />
+      <:actions>
+        <.button phx-disable-with="Changing...">Change Password</.button>
+      </:actions>
+    </.simple_form>
+    """
+  end
+
+  def mount(%{"token" => token}, _session, socket) do
+    socket =
+      case Accounts.update_user_email(socket.assigns.current_user, token) do
+        :ok ->
+          put_flash(socket, :info, "Email changed successfully.")
+
+        :error ->
+          put_flash(socket, :error, "Email change link is invalid or it has expired.")
+      end
+
+    {:ok, push_navigate(socket, to: ~p"/users/settings")}
+  end
+
+  def mount(_params, _session, socket) do
+    user = socket.assigns.current_user
+
+    socket =
+      socket
+      |> assign(:current_password, nil)
+      |> assign(:email_form_current_password, nil)
+      |> assign(:current_email, user.email)
+      |> assign(:email_changeset, Accounts.change_user_email(user))
+      |> assign(:password_changeset, Accounts.change_user_password(user))
+      |> assign(:trigger_submit, false)
+
+    {:ok, socket}
+  end
+
+  def handle_event("validate_email", params, socket) do
+    %{"current_password" => password, "user" => user_params} = params
+    email_changeset = Accounts.change_user_email(socket.assigns.current_user, user_params)
+
+    socket =
+      assign(socket,
+        email_changeset: Map.put(email_changeset, :action, :validate),
+        email_form_current_password: password
+      )
+
+    {:noreply, socket}
+  end
+
+  def handle_event("update_email", params, socket) do
+    %{"current_password" => password, "user" => user_params} = params
+    user = socket.assigns.current_user
+
+    case Accounts.apply_user_email(user, password, user_params) do
+      {:ok, applied_user} ->
+        Accounts.deliver_user_update_email_instructions(
+          applied_user,
+          user.email,
+          &url(~p"/users/settings/confirm_email/#{&1}")
+        )
+
+        info = "A link to confirm your email change has been sent to the new address."
+        {:noreply, put_flash(socket, :info, info)}
+
+      {:error, changeset} ->
+        {:noreply, assign(socket, :email_changeset, Map.put(changeset, :action, :insert))}
+    end
+  end
+
+  def handle_event("validate_password", params, socket) do
+    %{"current_password" => password, "user" => user_params} = params
+    password_changeset = Accounts.change_user_password(socket.assigns.current_user, user_params)
+
+    {:noreply,
+     socket
+     |> assign(:password_changeset, Map.put(password_changeset, :action, :validate))
+     |> assign(:current_password, password)}
+  end
+
+  def handle_event("update_password", params, socket) do
+    %{"current_password" => password, "user" => user_params} = params
+    user = socket.assigns.current_user
+
+    case Accounts.update_user_password(user, password, user_params) do
+      {:ok, user} ->
+        socket =
+          socket
+          |> assign(:trigger_submit, true)
+          |> assign(:password_changeset, Accounts.change_user_password(user, user_params))
+
+        {:noreply, socket}
+
+      {:error, changeset} ->
+        {:noreply, assign(socket, :password_changeset, changeset)}
+    end
+  end
+end