neiam /gitgud

defmodule GitGudWeb.SymsLive.Show do
  @moduledoc """
  The repositories a user has marked with one symbol.
  """
  use GitGudWeb, :live_view

  alias GitGud.Accounts
  alias GitGud.Repositories.Storage
  alias GitGud.Syms

  @impl true
  def mount(%{"handle" => handle, "sym" => sym}, _session, socket) do
    user = Accounts.get_user_by_handle(handle)

    cond do
      is_nil(user) ->
        {:ok, socket |> put_flash(:error, "User not found.") |> push_navigate(to: ~p"/")}

      # A symbol this instance doesn't configure has no page, whether it
      # was retired or never existed.
      not Syms.known?(sym) ->
        {:ok,
         socket
         |> put_flash(:error, "No such symbol on this instance.")
         |> push_navigate(to: ~p"/u/#{handle}/syms")}

      true ->
        viewer = socket.assigns.current_scope && socket.assigns.current_scope.user
        repos = user |> Syms.list_marked(sym) |> Enum.filter(&readable?(&1, viewer))

        {:ok,
         socket
         |> assign(:user, user)
         |> assign(:sym, sym)
         |> assign(:repos, repos)
         |> assign(:page_title, "@#{user.handle}: #{sym}")}
    end
  end

  # Marked repos can belong to anyone, so this is a per-repo check, not
  # "does the viewer own the marking user's repos".
  defp readable?(%{visibility: v}, _viewer) when v in ["public", "internal"], do: true
  defp readable?(%{owner_id: oid}, %{id: oid}), do: true
  defp readable?(_, _), do: false

  @impl true
  def render(assigns) do
    ~H"""
    <Layouts.app flash={@flash} current_scope={@current_scope}>
      <div class="space-y-4 max-w-2xl">
        <h1 class="text-xl font-semibold flex items-center gap-2">
          <.link navigate={~p"/u/#{@user.handle}"} class="link link-hover">
            @{@user.handle}
          </.link>
          <span class="opacity-50">/</span>
          <.link navigate={~p"/u/#{@user.handle}/syms"} class="link link-hover">syms</.link>
          <span class="opacity-50">/</span>
          <span class="text-2xl leading-none">{@sym}</span>
        </h1>

        <p :if={@repos == []} class="text-sm opacity-60">
          Nothing marked {@sym} yet.
        </p>

        <ul class="divide-y divide-base-300">
          <li :for={repo <- @repos} class="py-3">
            <.link
              navigate={~p"/r/#{Storage.repo_handle(repo)}/#{repo.name}"}
              class="font-medium link link-hover"
            >
              {Storage.repo_handle(repo)}/{repo.name}
            </.link>
            <p :if={repo.description} class="text-xs opacity-60">{repo.description}</p>
          </li>
        </ul>
      </div>
    </Layouts.app>
    """
  end
end