defmodule PutzplanWeb.TaskLive.Index do
  use PutzplanWeb, :live_view

  @impl true
  def render(assigns) do
    ~H"""
    <.header>
      Listing Tasks
      <:actions>
        <.link patch={~p"/tasks/new"}>
          <.button>New Task</.button>
        </.link>
      </:actions>
    </.header>

    <div id="tasks" class="grid grid-cols-1 gap-4 sm:grid-cols-1 lg:grid-cols-2">
      <%= for task <- @tasks do %>
        <div
          id={task.id}
          class="flex flex-col p-4 bg-white rounded-lg shadow-md hover:shadow-lg transition-shadow duration-200 cursor-pointer"
          phx-click={JS.navigate(~p"/tasks/#{task}")}
        >
          <div class="flex justify-between items-center mb-3">
            <div class="font-medium text-gray-800 text-lg">{task.description}</div>
            <div class="flex space-x-2">
              <.link
                phx-click={JS.push("complete", value: %{id: task.id})}
                class="text-green-600 hover:text-green-800 p-1 rounded-full hover:bg-green-100"
              >
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke-width="1.5"
                  stroke="currentColor"
                  class="w-6 h-6"
                >
                  <path stroke-linecap="round" stroke-linejoin="round" d="m4.5 12.75 6 6 9-13.5" />
                </svg>
              </.link>
            </div>
          </div>

          <div class="mb-3">
            <div class="text-sm text-gray-500">Due</div>
            <div class="text-gray-700">{format_date(task.due)}</div>
          </div>

          <div class="mt-auto pt-3 border-t border-gray-100 flex justify-between items-center">
            <div class="sr-only">
              <.link navigate={~p"/tasks/#{task}"}>Show</.link>
            </div>

            <div class="flex space-x-2">
              <.link
                patch={~p"/tasks/#{task}/edit"}
                class="text-blue-600 hover:text-blue-800 p-1 rounded-full hover:bg-blue-100"
                phx-click-stop-propagation="true"
              >
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke-width="1.5"
                  stroke="currentColor"
                  class="w-6 h-6"
                >
                  <path
                    stroke-linecap="round"
                    stroke-linejoin="round"
                    d="m16.862 4.487 1.687-1.688a1.875 1.875 0 1 1 2.652 2.652L10.582 16.07a4.5 4.5 0 0 1-1.897 1.13L6 18l.8-2.685a4.5 4.5 0 0 1 1.13-1.897l8.932-8.931Zm0 0L19.5 7.125M18 14v4.75A2.25 2.25 0 0 1 15.75 21H5.25A2.25 2.25 0 0 1 3 18.75V8.25A2.25 2.25 0 0 1 5.25 6H10"
                  />
                </svg>
              </.link>

              <.link
                phx-click={JS.push("delete", value: %{id: task.id}) |> hide(task.id)}
                data-confirm="Are you sure?"
                class="text-red-600 hover:text-red-800 p-1 rounded-full hover:bg-red-100"
                phx-click-stop-propagation="true"
              >
                <svg
                  xmlns="http://www.w3.org/2000/svg"
                  fill="none"
                  viewBox="0 0 24 24"
                  stroke-width="1.5"
                  stroke="currentColor"
                  class="w-6 h-6"
                >
                  <path
                    stroke-linecap="round"
                    stroke-linejoin="round"
                    d="m14.74 9-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 0 1-2.244 2.077H8.084a2.25 2.25 0 0 1-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 0 0-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 0 1 3.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 0 0-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 0 0-7.5 0"
                  />
                </svg>
              </.link>
            </div>
          </div>
        </div>
      <% end %>
    </div>

    <.modal :if={@live_action in [:new, :edit]} id="task-modal" show on_cancel={JS.patch(~p"/tasks")}>
      <.live_component
        module={PutzplanWeb.TaskLive.FormComponent}
        id={(@task && @task.id) || :new}
        title={@page_title}
        current_user={@current_user}
        action={@live_action}
        task={@task}
        patch={~p"/"}
      />
    </.modal>
    """
  end

  @impl true
  def mount(_params, _session, socket) do
    if connected?(socket), do: Putzplan.PubSub.subscribe_tasks()

    tasks =
      Ash.read!(Putzplan.Tasks.Task, load: [:due], actor: socket.assigns[:current_user])
      |> sort_tasks_by_due_date()

    {:ok,
     socket
     |> assign(:tasks, tasks)
     |> assign_new(:current_user, fn -> nil end)}
  end

  defp sort_tasks_by_due_date(tasks) do
    Enum.sort_by(tasks, & &1.due, Date)
  end

  @impl true
  def handle_params(params, _url, socket) do
    {:noreply, apply_action(socket, socket.assigns.live_action, params)}
  end

  @impl true
  def handle_info({:delete, task}, socket) do
    updated_tasks = Enum.reject(socket.assigns.tasks, fn t -> t.id == task.id end)
    {:noreply, assign(socket, :tasks, updated_tasks)}
  end

  @impl true
  def handle_info({:upsert, task}, socket) do
    updated_tasks = 
      socket.assigns.tasks
      |> Enum.reject(fn t -> t.id == task.id end)
      |> Enum.concat([task])
      |> sort_tasks_by_due_date()
    
    {:noreply, assign(socket, :tasks, updated_tasks)}
  end

  @impl true
  def handle_info({:update, task_id}, socket) do
    task = Ash.get!(Putzplan.Tasks.Task, task_id, load: [:due])
    
    updated_tasks = 
      socket.assigns.tasks
      |> Enum.reject(fn t -> t.id == task.id end)
      |> Enum.concat([task])
      |> sort_tasks_by_due_date()
    
    {:noreply, assign(socket, :tasks, updated_tasks)}
  end

  defp apply_action(socket, :edit, %{"id" => id}) do
    socket
    |> assign(:page_title, "Edit Task")
    |> assign(
      :task,
      Ash.get!(Putzplan.Tasks.Task, id, actor: socket.assigns.current_user)
    )
  end

  defp apply_action(socket, :new, _params) do
    socket
    |> assign(:page_title, "New Task")
    |> assign(:task, nil)
  end

  defp apply_action(socket, :index, _params) do
    socket
    |> assign(:page_title, "Listing Tasks")
    |> assign(:task, nil)
  end

  @impl true
  def handle_event("delete", %{"id" => id}, socket) do
    task = Ash.get!(Putzplan.Tasks.Task, id, actor: socket.assigns.current_user)
    Ash.destroy!(task, actor: socket.assigns.current_user)
    Putzplan.PubSub.delete_task(task)

    {:noreply, socket}
  end

  @impl true
  def handle_event("complete", %{"id" => id}, socket) do
    completed_task =
      Putzplan.Tasks.CompletedTask
      |> Ash.Changeset.for_create(:create, %{task: id, user: socket.assigns.current_user.id})
      |> Ash.create!(actor: socket.assigns.current_user)

    task = Ash.get!(Putzplan.Tasks.Task, id, load: [:due])
    Putzplan.PubSub.upsert_task(task)
    Putzplan.PubSub.upsert_completed_task(completed_task)

    {:noreply, socket}
  end

  defp format_date(date) do
    string =
      case Date.diff(date, Date.utc_today()) do
        -1 ->
          "yesterday"

        0 ->
          "today"

        1 ->
          "tomorrow"

        days when days > 0 and days < 7 ->
          "next " <> get_weekday(Date.day_of_week(date))

        _ ->
          Date.to_string(date)
      end

    String.capitalize(string)
  end

  defp get_weekday(index) do
    days = %{
      1 => "monday",
      2 => "tuesday",
      3 => "wednesday",
      4 => "thursday",
      5 => "friday",
      6 => "saturday",
      7 => "sunday"
    }

    Map.get(days, index)
  end
end