defmodule OrionWeb.Components do
  use Phoenix.Component

  @doc """
  Renders an input with label and error messages.
  A `%Phoenix.HTML.Form{}` and field name may be passed to the input
  to build input names and error messages, or all the attributes and
  errors may be passed explicitly.
  ## Examples
      <.input field={@form[:email]} type="email" />
      <.input name="my-input" errors={["oh no!"]} />
  """
  attr :id, :any, default: nil
  attr :name, :any
  attr :label, :string, default: nil
  attr :value, :any

  attr :type, :string,
    default: "text",
    values: ~w(checkbox color date datetime-local email file hidden month number password
               range radio search select tel text textarea time url week)

  attr :field, Phoenix.HTML.FormField,
    doc: "a form field struct retrieved from the form, for example: @form[:email]"

  attr :errors, :list, default: []
  attr :checked, :boolean, doc: "the checked flag for checkbox inputs"
  attr :prompt, :string, default: nil, doc: "the prompt for select inputs"
  attr :options, :list, doc: "the options to pass to Phoenix.HTML.Form.options_for_select/2"
  attr :multiple, :boolean, default: false, doc: "the multiple flag for select inputs"

  attr :rest, :global,
    include: ~w(autocomplete cols disabled form list max maxlength min minlength
                pattern placeholder readonly required rows size step)

  slot :inner_block

  def input(%{field: %Phoenix.HTML.FormField{} = field} = assigns) do
    assigns
    |> assign(field: nil, id: assigns.id || field.id)
    |> assign(:errors, Enum.map(field.errors, &translate_error(&1)))
    |> assign_new(:name, fn -> if assigns.multiple, do: field.name <> "[]", else: field.name end)
    |> assign_new(:value, fn -> field.value end)
    |> input()
  end

  def input(%{type: "checkbox", value: value} = assigns) do
    assigns =
      assign_new(assigns, :checked, fn -> Phoenix.HTML.Form.normalize_value("checkbox", value) end)

    ~H"""
    <div phx-feedback-for={@name}>
      <label class="flex flex-col flex-grow items-center text-black gap-3 mx-2 font-medium">
        <%= @label %>
        <input type="hidden" name={@name} value="false" />
        <input
          type="checkbox"
          id={@id}
          name={@name}
          value="true"
          checked={@checked}
          class="border-2 border-gray-60 bg-white text-black focus:border-blue-50 hover:border-teal-50 rounded px-1 mx-4 leading-tight focus:outline-none"
          {@rest}
        />
      </label>
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  def input(%{type: "select"} = assigns) do
    ~H"""
    <div phx-feedback-for={@name}>
      <.label for={@id}><%= @label %></.label>
      <select
        id={@id}
        name={@name}
        class="mt-1 block w-full rounded-md border border-gray-300 bg-white shadow-sm focus:border-zinc-400 focus:ring-0 sm:text-sm"
        multiple={@multiple}
        {@rest}
      >
        <option :if={@prompt} value=""><%= @prompt %></option>
        <%= Phoenix.HTML.Form.options_for_select(@options, @value) %>
      </select>
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  def input(%{type: "textarea"} = assigns) do
    ~H"""
    <div phx-feedback-for={@name}>
      <.label for={@id}><%= @label %></.label>
      <textarea
        id={@id}
        name={@name}
        class={[
          @errors != [] && "border-red-40 focus:border-red-40"
        ]}
        {@rest}
      ><%= Phoenix.HTML.Form.normalize_value("textarea", @value) %></textarea>
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  # All other inputs text, datetime-local, url, password, etc. are handled here...
  def input(assigns) do
    ~H"""
    <div phx-feedback-for={@name} class="flex flex-col flex-grow">
      <.label for={@id}><%= @label %></.label>
      <input
        type={@type}
        name={@name}
        id={@id}
        value={Phoenix.HTML.Form.normalize_value(@type, @value)}
        class={[
          "border-2 border-gray-60 bg-white text-black hover:border-teal-50 focus:border-blue-50 rounded py-2 mb-3 leading-tight focus:outline-none",
          @errors != [] && "border-red-40 focus:border-red-40"
        ]}
        {@rest}
      />
      <.error :for={msg <- @errors}><%= msg %></.error>
    </div>
    """
  end

  @doc """
  Renders a label.
  """
  attr :for, :string, default: nil
  slot :inner_block, required: true

  def label(assigns) do
    ~H"""
    <label for={@for} class="text-black my-2 mx-1 font-medium">
      <%= render_slot(@inner_block) %>
    </label>
    """
  end

  @doc """
  Generates a generic error message.
  """
  slot :inner_block, required: true

  def error(assigns) do
    ~H"""
    <p class="mt-3 flex gap-3 text-sm leading-6 text-red-60 phx-no-feedback:hidden">
      <%= render_slot(@inner_block) %>
    </p>
    """
  end

  def translate_error({msg, opts}) do
    # You can make use of gettext to translate error messages by
    # uncommenting and adjusting the following code:

    # if count = opts[:count] do
    #   Gettext.dngettext(<%= @web_namespace %>.Gettext, "errors", msg, msg, count, opts)
    # else
    #   Gettext.dgettext(<%= @web_namespace %>.Gettext, "errors", msg, opts)
    # end

    Enum.reduce(opts, msg, fn {key, value}, acc ->
      String.replace(acc, "%{#{key}}", fn _ -> to_string(value) end)
    end)
  end

  @doc """
  Translates the errors for a field from a keyword list of errors.
  """
  def translate_errors(errors, field) when is_list(errors) do
    for {^field, {msg, opts}} <- errors, do: translate_error({msg, opts})
  end
end