defmodule ToweropsWeb.UserSettingsLive do
  @moduledoc """
  LiveView for managing user account settings.

  Allows users to update email, password, manage passkeys, and mobile sessions.
  """
  use ToweropsWeb, :live_view

  alias Towerops.Accounts
  alias Towerops.MobileSessions

  @impl true
  def mount(_params, _session, socket) do
    socket =
      socket
      |> assign(:page_title, "Account Settings")
      |> assign_changesets()
      |> assign_credentials()
      |> assign_mobile_sessions()

    {:ok, socket}
  end

  @impl true
  def handle_event("update_email", %{"user" => user_params}, socket) do
    user = socket.assigns.current_scope.user

    case Accounts.change_user_email(user, user_params) do
      %{valid?: true} = changeset ->
        _ =
          Accounts.deliver_user_update_email_instructions(
            Ecto.Changeset.apply_action!(changeset, :insert),
            user.email,
            &url(~p"/users/settings/confirm-email/#{&1}")
          )

        socket =
          socket
          |> put_flash(:info, "A link to confirm your email change has been sent to the new address.")
          |> assign_changesets()

        {:noreply, socket}

      changeset ->
        {:noreply, assign(socket, :email_form, to_form(%{changeset | action: :insert}))}
    end
  end

  @impl true
  def handle_event("update_password", %{"user" => user_params}, socket) do
    user = socket.assigns.current_scope.user

    case Accounts.update_user_password(user, user_params) do
      {:ok, {_updated_user, _}} ->
        # Redirect to re-authenticate with new password
        socket =
          socket
          |> put_flash(:info, "Password updated successfully. Please log in with your new password.")
          |> redirect(to: ~p"/users/log-in")

        {:noreply, socket}

      {:error, changeset} ->
        {:noreply, assign(socket, :password_form, to_form(changeset))}
    end
  end

  @impl true
  def handle_event("revoke_mobile_device", %{"session-id" => session_id}, socket) do
    case MobileSessions.revoke_session(session_id) do
      {:ok, _} ->
        socket =
          socket
          |> put_flash(:info, "Mobile device removed successfully.")
          |> assign_mobile_sessions()

        {:noreply, socket}

      {:error, _} ->
        {:noreply, put_flash(socket, :error, "Failed to remove mobile device.")}
    end
  end

  @impl true
  def handle_event("toggle_device_alerts", %{"session-id" => session_id, "enabled" => enabled}, socket) do
    enabled_bool = enabled == "true"

    case MobileSessions.update_alert_preferences(session_id, %{alerts_enabled: enabled_bool}) do
      {:ok, _} ->
        message = if enabled_bool, do: "Alerts enabled for device", else: "Alerts disabled for device"

        socket =
          socket
          |> put_flash(:info, message)
          |> assign_mobile_sessions()

        {:noreply, socket}

      {:error, _} ->
        {:noreply, put_flash(socket, :error, "Failed to update alert preferences.")}
    end
  end

  defp assign_changesets(socket) do
    user = socket.assigns.current_scope.user

    socket
    |> assign(:email_form, user |> Accounts.change_user_email() |> to_form())
    |> assign(:password_form, user |> Accounts.change_user_password() |> to_form())
  end

  defp assign_credentials(socket) do
    user = socket.assigns.current_scope.user

    socket
    |> assign(:credentials, Accounts.list_user_credentials(user.id))
    |> assign(:can_register_passkey, Accounts.passkey_registration_allowed?(user))
  end

  defp assign_mobile_sessions(socket) do
    user = socket.assigns.current_scope.user
    assign(socket, :mobile_sessions, MobileSessions.list_user_sessions(user.id))
  end

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.authenticated flash={@flash} current_scope={@current_scope} current_organization={nil}>
      <div class="text-center">
        <.header>
          Account Settings
          <:subtitle>Manage your account email address and password settings</:subtitle>
        </.header>
      </div>

      <.form
        for={@email_form}
        phx-submit="update_email"
        id="update_email"
        class="space-y-4"
      >
        <.input
          field={@email_form[:email]}
          type="email"
          label="Email"
          autocomplete="email"
          required
        />

        <.button variant="primary" phx-disable-with="Changing...">Change Email</.button>
      </.form>

      <div class="divider" />

      <.form
        for={@password_form}
        phx-submit="update_password"
        id="update_password"
        class="space-y-4"
      >
        <.input
          field={@password_form[:password]}
          type="password"
          label="New password"
          autocomplete="new-password"
          required
        />
        <.input
          field={@password_form[:password_confirmation]}
          type="password"
          label="Confirm new password"
          autocomplete="new-password"
          required
        />
        <.button variant="primary" phx-disable-with="Changing...">
          Save Password
        </.button>
      </.form>

      <div class="divider" />

      <div>
        <h3 class="text-lg font-semibold leading-6 text-zinc-900 dark:text-zinc-100">
          Alert Notification Devices
        </h3>
        <p class="mt-1 text-sm text-zinc-600 dark:text-zinc-400">
          Manage mobile devices that receive push notifications for alerts
        </p>

        <div class="mt-6 space-y-4">
          <%= if Enum.empty?(@mobile_sessions) do %>
            <div class="rounded-lg border border-dashed border-zinc-300 p-8 text-center dark:border-zinc-700">
              <.icon name="hero-device-phone-mobile" class="mx-auto h-12 w-12 text-zinc-400" />
              <h3 class="mt-2 text-sm font-semibold text-zinc-900 dark:text-zinc-100">
                No mobile devices registered
              </h3>
              <p class="mt-1 text-sm text-zinc-500 dark:text-zinc-400">
                Add a mobile device to receive push notifications for alerts
              </p>
            </div>
          <% else %>
            <div class="space-y-3">
              <%= for session <- @mobile_sessions do %>
                <div class="flex items-center justify-between rounded-lg border border-zinc-200 p-4 dark:border-zinc-800">
                  <div class="flex items-center gap-3">
                    <.icon name="hero-device-phone-mobile" class="h-5 w-5 text-zinc-400" />
                    <div>
                      <p class="font-medium text-zinc-900 dark:text-zinc-100">
                        {session.device_name || "Unknown Device"}
                      </p>
                      <p class="text-sm text-zinc-500 dark:text-zinc-400">
                        {session.device_os} • {session.app_version}
                      </p>
                      <p class="text-sm text-zinc-500 dark:text-zinc-400">
                        Last used {Calendar.strftime(session.last_used_at, "%B %d, %Y")}
                      </p>
                    </div>
                  </div>
                  <div class="flex items-center gap-3">
                    <button
                      type="button"
                      phx-click="toggle_device_alerts"
                      phx-value-session-id={session.id}
                      phx-value-enabled={if session.alerts_enabled, do: "false", else: "true"}
                      class={[
                        "inline-flex items-center gap-2 rounded-lg px-3 py-2 text-sm font-semibold shadow-sm",
                        if(session.alerts_enabled,
                          do:
                            "bg-green-100 text-green-700 hover:bg-green-200 dark:bg-green-900/20 dark:text-green-400 dark:hover:bg-green-900/30",
                          else:
                            "bg-zinc-100 text-zinc-700 hover:bg-zinc-200 dark:bg-zinc-800 dark:text-zinc-400 dark:hover:bg-zinc-700"
                        )
                      ]}
                    >
                      <%= if session.alerts_enabled do %>
                        <.icon name="hero-bell" class="h-4 w-4" /> Alerts On
                      <% else %>
                        <.icon name="hero-bell-slash" class="h-4 w-4" /> Alerts Off
                      <% end %>
                    </button>
                    <button
                      type="button"
                      phx-click="revoke_mobile_device"
                      phx-value-session-id={session.id}
                      data-confirm="Are you sure you want to remove this device?"
                      class="text-sm font-semibold text-red-600 hover:text-red-500 dark:text-red-400 dark:hover:text-red-300"
                    >
                      Remove
                    </button>
                  </div>
                </div>
              <% end %>
            </div>
          <% end %>

          <.link
            navigate={~p"/mobile/qr-login"}
            class="inline-flex items-center gap-2 rounded-lg bg-zinc-900 px-3 py-2 text-sm font-semibold text-white shadow-sm hover:bg-zinc-700 dark:bg-zinc-50 dark:text-zinc-900 dark:hover:bg-zinc-300"
          >
            <.icon name="hero-qr-code" class="h-4 w-4" /> Add Mobile Device
          </.link>
        </div>
      </div>

      <div class="divider" />

      <div>
        <h3 class="text-lg font-semibold leading-6 text-zinc-900 dark:text-zinc-100">
          Passkeys
        </h3>
        <p class="mt-1 text-sm text-zinc-600 dark:text-zinc-400">
          Use your device's biometrics (Face ID, Touch ID, Windows Hello) or security keys to sign in
        </p>

        <%= if !@can_register_passkey do %>
          <div class="mt-4 rounded-lg bg-amber-50 p-4 dark:bg-amber-900/20">
            <p class="text-sm text-amber-800 dark:text-amber-200">
              Please confirm your email address before registering a passkey. Check your inbox for the confirmation link.
            </p>
          </div>
        <% end %>

        <div class="mt-6 space-y-4">
          <%= if Enum.empty?(@credentials) do %>
            <div class="rounded-lg border border-dashed border-zinc-300 p-8 text-center dark:border-zinc-700">
              <.icon name="hero-key" class="mx-auto h-12 w-12 text-zinc-400" />
              <h3 class="mt-2 text-sm font-semibold text-zinc-900 dark:text-zinc-100">
                No passkeys registered
              </h3>
              <p class="mt-1 text-sm text-zinc-500 dark:text-zinc-400">
                Add a passkey to enable quick, secure sign-in with biometrics
              </p>
            </div>
          <% else %>
            <div class="space-y-3">
              <%= for credential <- @credentials do %>
                <div class="flex items-center justify-between rounded-lg border border-zinc-200 p-4 dark:border-zinc-800">
                  <div class="flex items-center gap-3">
                    <.icon name="hero-key" class="h-5 w-5 text-zinc-400" />
                    <div>
                      <p class="font-medium text-zinc-900 dark:text-zinc-100">
                        {credential.name}
                      </p>
                      <%= if credential.last_used_at do %>
                        <p class="text-sm text-zinc-500 dark:text-zinc-400">
                          Last used {Calendar.strftime(credential.last_used_at, "%B %d, %Y")}
                        </p>
                      <% else %>
                        <p class="text-sm text-zinc-500 dark:text-zinc-400">Never used</p>
                      <% end %>
                    </div>
                  </div>
                  <.link
                    href={~p"/users/credentials/#{credential.id}"}
                    method="delete"
                    data-confirm="Are you sure you want to delete this passkey?"
                    class="text-sm font-semibold text-red-600 hover:text-red-500 dark:text-red-400 dark:hover:text-red-300"
                  >
                    Delete
                  </.link>
                </div>
              <% end %>
            </div>
          <% end %>

          <%= if @can_register_passkey do %>
            <button
              type="button"
              id="add-passkey-btn"
              class="inline-flex items-center gap-2 rounded-lg bg-zinc-900 px-3 py-2 text-sm font-semibold text-white shadow-sm hover:bg-zinc-700 dark:bg-zinc-50 dark:text-zinc-900 dark:hover:bg-zinc-300"
            >
              <.icon name="hero-plus" class="h-4 w-4" /> Add Passkey
            </button>
            
    <!-- Passkey Registration Modal -->
            <div
              id="passkey-modal"
              class="hidden fixed inset-0 z-50 overflow-y-auto"
              aria-labelledby="modal-title"
              role="dialog"
              aria-modal="true"
            >
              <div class="flex min-h-screen items-end justify-center px-4 pb-20 pt-4 text-center sm:block sm:p-0">
                <!-- Background overlay -->
                <div
                  class="fixed inset-0 z-0 bg-zinc-500 bg-opacity-75 transition-opacity dark:bg-zinc-950 dark:bg-opacity-75"
                  aria-hidden="true"
                >
                </div>
                
    <!-- Center modal -->
                <span
                  class="relative z-10 hidden sm:inline-block sm:h-screen sm:align-middle"
                  aria-hidden="true"
                >
                  &#8203;
                </span>

                <div class="relative z-10 inline-block transform overflow-hidden rounded-lg bg-white px-4 pb-4 pt-5 text-left align-bottom shadow-xl transition-all dark:bg-zinc-900 sm:my-8 sm:w-full sm:max-w-lg sm:p-6 sm:align-middle">
                  <div>
                    <div class="mx-auto flex h-12 w-12 items-center justify-center rounded-full bg-blue-100 dark:bg-blue-900">
                      <.icon name="hero-key" class="h-6 w-6 text-blue-600 dark:text-blue-400" />
                    </div>
                    <div class="mt-3 text-center sm:mt-5">
                      <h3
                        class="text-lg font-semibold leading-6 text-zinc-900 dark:text-zinc-100"
                        id="modal-title"
                      >
                        Add Passkey
                      </h3>
                      <div class="mt-2">
                        <p class="text-sm text-zinc-500 dark:text-zinc-400">
                          Give this passkey a name to help you identify it later (e.g., "MacBook Touch ID", "iPhone").
                        </p>
                      </div>
                      <div class="mt-4">
                        <input
                          type="text"
                          id="passkey-name-input"
                          placeholder="e.g., MacBook Touch ID"
                          class="block w-full rounded-lg border-zinc-300 shadow-sm focus:border-blue-500 focus:ring-blue-500 dark:border-zinc-700 dark:bg-zinc-800 dark:text-zinc-100 sm:text-sm"
                        />
                      </div>
                      <div
                        id="passkey-error"
                        class="mt-3 hidden rounded-lg bg-red-50 p-3 dark:bg-red-900/20"
                      >
                        <p class="text-sm text-red-800 dark:text-red-200"></p>
                      </div>
                    </div>
                  </div>
                  <div class="mt-5 sm:mt-6 sm:grid sm:grid-flow-row-dense sm:grid-cols-2 sm:gap-3">
                    <button
                      type="button"
                      id="confirm-add-passkey"
                      class="inline-flex w-full justify-center rounded-lg bg-blue-600 px-3 py-2 text-sm font-semibold text-white shadow-sm hover:bg-blue-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-blue-600 disabled:opacity-50 disabled:cursor-not-allowed sm:col-start-2"
                    >
                      Continue
                    </button>
                    <button
                      type="button"
                      id="cancel-add-passkey"
                      class="mt-3 inline-flex w-full justify-center rounded-lg bg-white px-3 py-2 text-sm font-semibold text-zinc-900 shadow-sm ring-1 ring-inset ring-zinc-300 hover:bg-zinc-50 dark:bg-zinc-800 dark:text-zinc-100 dark:ring-zinc-700 dark:hover:bg-zinc-700 sm:col-start-1 sm:mt-0"
                    >
                      Cancel
                    </button>
                  </div>
                </div>
              </div>
            </div>
          <% end %>
        </div>
      </div>
    </Layouts.authenticated>
    """
  end
end