defmodule FreediveWeb.UserRegistrationLive do
  use FreediveWeb, :live_view

  alias Freedive.Accounts
  alias Freedive.Accounts.User
  alias Freedive.Features

  def render(assigns) do
    if Features.enabled?(:register_account) do
      ~H"""
      <div class="mx-auto max-w-sm">
        <.header class="text-center">
          Register for an account
          <:subtitle>
            Already registered?
            <.link navigate={~p"/users/log_in"} class="font-semibold text-brand hover:underline">
              Log in
            </.link>
            to your account now.
          </:subtitle>
        </.header>

        <.simple_form
          for={@form}
          id="registration_form"
          phx-submit="save"
          phx-change="validate"
          phx-trigger-action={@trigger_submit}
          action={~p"/users/log_in?_action=registered"}
          method="post"
        >
          <.error :if={@check_errors}>
            Oops, something went wrong! Please check the errors below.
          </.error>

          <.input field={@form[:email]} type="email" label="Email" required />
          <.input field={@form[:password]} type="password" label="Password" required />

          <:actions>
            <.button phx-disable-with="Creating account..." class="w-full">Create an account</.button>
          </:actions>
        </.simple_form>
      </div>
      """
    else
      ~H"""
      <.section>
        <.title>
          Sorry!
        </.title>
        <.subtitle>
          Registration is closed.
        </.subtitle>
      </.section>
      """
    end
  end

  def mount(_params, _session, socket) do
    changeset = Accounts.change_user_registration(%User{})

    socket =
      socket
      |> assign(trigger_submit: false, check_errors: false)
      |> assign_form(changeset)

    {:ok, socket, temporary_assigns: [form: nil]}
  end

  def handle_event("save", %{"user" => user_params}, socket) do
    if Features.enabled?(:register_account) do
      case Accounts.register_user(user_params) do
        {:ok, user} ->
          {:ok, _} =
            Accounts.deliver_user_confirmation_instructions(
              user,
              &url(~p"/users/confirm/#{&1}")
            )

          changeset = Accounts.change_user_registration(user)
          {:noreply, socket |> assign(trigger_submit: true) |> assign_form(changeset)}

        {:error, %Ecto.Changeset{} = changeset} ->
          {:noreply, socket |> assign(check_errors: true) |> assign_form(changeset)}
      end
    else
      {:noreply, socket}
    end
  end

  def handle_event("validate", %{"user" => user_params}, socket) do
    changeset = Accounts.change_user_registration(%User{}, user_params)
    {:noreply, assign_form(socket, Map.put(changeset, :action, :validate))}
  end

  defp assign_form(socket, %Ecto.Changeset{} = changeset) do
    form = to_form(changeset, as: "user")

    if changeset.valid? do
      assign(socket, form: form, check_errors: false)
    else
      assign(socket, form: form)
    end
  end
end