defmodule CanneryWeb.ViewHelpers do
  @moduledoc """
  Contains common helpers that can be used in liveviews and regular views. These
  are automatically imported into any Phoenix View using `use CanneryWeb,
  :view`
  """

  use Phoenix.Component

  @doc """
  Phoenix.Component for a <time> element that renders the naivedatetime in the
  user's local timezone with Alpine.js
  """

  attr :datetime, :any, required: true, doc: "A `DateTime` struct or nil"

  def datetime(assigns) do
    ~H"""
    <%= if @datetime do %>
      <time
        datetime={cast_datetime(@datetime)}
        x-data={"{
          datetime:
            Intl.DateTimeFormat([], {dateStyle: 'short', timeStyle: 'long'})
              .format(new Date(\"#{cast_datetime(@datetime)}\"))
        }"}
        x-text="datetime"
      >
        <%= cast_datetime(@datetime) %>
      </time>
    <% end %>
    """
  end

  @spec cast_datetime(NaiveDateTime.t() | nil) :: String.t()
  defp cast_datetime(%NaiveDateTime{} = datetime) do
    datetime |> DateTime.from_naive!("Etc/UTC") |> DateTime.to_iso8601(:extended)
  end

  defp cast_datetime(_datetime), do: ""

  @doc """
  Phoenix.Component for a <date> element that renders the Date in the user's
  local timezone with Alpine.js
  """

  attr :date, :any, required: true, doc: "A `Date` struct or nil"

  def date(assigns) do
    ~H"""
    <%= if @date do %>
      <time
        datetime={@date |> Date.to_iso8601(:extended)}
        x-data={"{
          date:
            Intl.DateTimeFormat([], {timeZone: 'Etc/UTC', dateStyle: 'short'})
              .format(new Date(\"#{@date |> Date.to_iso8601(:extended)}\"))
        }"}
        x-text="date"
      >
        <%= @date |> Date.to_iso8601(:extended) %>
      </time>
    <% end %>
    """
  end

  @doc """
  Displays emoji as text emoji if SHIBAO_MODE is set to true :)
  """
  @spec display_emoji(String.t()) :: String.t()
  def display_emoji("😔") do
    if Application.get_env(:cannery, CanneryWeb.ViewHelpers)[:shibao_mode], do: "q_q", else: "😔"
  end

  def display_emoji(other_emoji), do: other_emoji

  @doc """
  Get a random color in `#ffffff` hex format

  ## Examples

      iex> random_color()
      "#cc0066"
  """
  @spec random_color() :: <<_::7>>
  def random_color do
    ["#cc0066", "#ff6699", "#6666ff", "#0066cc", "#00cc66", "#669900", "#ff9900", "#996633"]
    |> Enum.random()
  end
end