defmodule PhoenixRealWorldWeb.ArticleLive.Show do
  use PhoenixRealWorldWeb, :live_view

  alias PhoenixRealWorld.Blogs
  alias PhoenixRealWorld.Blogs.Comment #←追加

  @impl true
  def mount(_params, _session, socket) do
    {:ok, socket}
  end

  @impl true
  def handle_params(%{"id" => id}, _, socket) do
    #↓追加&変更
    article = Blogs.get_article!(id)
    %{live_action: action, current_user: user} = socket.assigns
    # 編集モードで、ログインユーザーが記事の作者でない場合は、記事一覧にリダイレクト
    if action = :edit && article.author.id != user.id do
      {:noreply, push_navigate(socket, to: ~p"/articles")}
    # 編集モードで、ログインユーザーが記事の作者である場合は、記事を表示
    else
      changeset = Blogs.change_comment(%Comment{}) #←追加

      {:noreply,
      socket
      |> assign(:page_title, page_title(socket.assigns.live_action))
      |> assign(:article, Blogs.get_article!(id))}
      |> assign(:commment_form, to_form(changeset)) #←追加
    end
  end

  @impl true
  def handle_event("delete", _params, socket) do
    %{article: article, current_user: user} = socket.assigns

    if article.author.id == user.id do
      {:noreply, socket}
    else
      {:ok, _} = Blogs.delete_article(article)
      {:noreply, push_navigate(socket, to: ~p"/articles")}
    end
  end

  #追加
  @impl true
  def handle_event("validate_comment", %{"comment" => comment_params}, socket) do
    changeset =
      %Comment{}
      |> Blogs.change_comment(comment_params)
      |> Map.put(:action, :validate)

      {:noreply, assign(socket, :comment_form, to_form(changeset))}
  end

  #追加
  @impl true
  def handle_event("post_comment", %{"comment" => comment_params}, socket) do
    comment_params =
      comment_params
      |> Map.put("article_id", socket.assigns.article.id)
      |> Map.put("author_id", socket.assigns.current_user.id)
    case Blogs.create_comment(comment_params) do
      #コメントの作成に成功した場合
      {:ok, _} ->
        article = Blogs.get_article!(socket.assigns.article.id)
        changeset = Blogs.change_comment(%Comment{})

        {:noreply,
          socket
          |> assign(:article, article)
          |> assign(:comment_form, to_form(changeset))
          |> put_flash(:info, "Comment posted successfully")}
      #コメントの作成に失敗した場合
      _ ->
        {:noreply, socket}
    end
  end

  defp page_title(:show), do: "Show Article"
  defp page_title(:edit), do: "Edit Article"
end