defmodule Moon.Light.Table do
  @moduledoc false
  use Moon.Light.Component
  alias Moon.Icon
  import Moon.Helpers.MakeList, only: [add_index_as: 1]

  attr(:selected, :any, default: [], doc: "List of  selected ids, or just id, or [], or nil")

  attr(:sort, :any,
    default: [],
    doc:
      "Sorting of the table, format [field:, \"ASC\"|\"DESC\"]. If given, component will sort given items before displaying"
  )

  attr(:items, :any,
    required: true,
    doc:
      "The list of items to be rendered. If item does not have id - than index is used instead. Able to work with streams"
  )

  attr(:row_click, :any, doc: "Event that firset on row click")

  attr(:row_click_cb, :any,
    doc: "Callback for generating on_click per row. row and row_id will bi given as parameters"
  )

  attr(:sorting_click, :any, doc: "Sorting stuff")

  attr(:row_gap, :any,
    default: "border-spacing-y-1",
    doc: "Can be used to add any class to the table"
  )

  attr(:row_size, :string,
    values: ~w(xs sm md lg xl 2xl),
    default: "md",
    doc: "Size of the row. not a css class!"
  )

  attr(:is_cell_border, :boolean, default: false, doc: "If cell has border")

  attr(:is_headless, :boolean, default: false, doc: "If table has column headers or not")

  attr(:is_zebra_style, :boolean,
    default: false,
    doc: "If table is styled to present its rows in automatically alternating colours"
  )

  attr(:row_bg, :any,
    default: "bg-goku",
    doc: "Can be used as an additional class for all the rows"
  )

  attr(:selected_bg, :any,
    default: "bg-beerus",
    doc: "Can be used as an additional class for selected rows"
  )

  attr(:header_row_class, :any, doc: "Can be used as an additional class for header row")

  attr(:even_row_bg, :any,
    default: "bg-transparent",
    doc: "Can be used as an additional class for even rows in zebra-style table"
  )

  attr(:hover_bg, :any,
    doc: "Can be used as an additional class for all rows. please use hover:... tailwind's format"
  )

  slot(:cols, generator_prop: :items, doc: "The list of columns defining the Grid")

  attr(:id, :string, doc: "Just an id for a table tag")

  attr(:testid, :string, doc: "Data-testid attribute for a table tag")

  attr(:class, :any, doc: "Additional classes for a table tag")

  attr(:body_attrs, :map, default: %{}, doc: "Additional attributes for tbody tag")

  def table(assigns) do
    ~H"""
    <table
      class={[
        merge([
          [
            "text-sm border-spacing-x-0 border-beerus min-w-full bg-gohan rounded-moon-s-sm",
            @row_gap,
            "border-spacing-y-0": @is_zebra_style
          ],
          @class
        ]),
        "border-separate"
      ]}
      id={@id}
      data-testid={@testid}
    >
      <thead :if={!@is_headless}>
        <tr class={@header_row_class}>
          <%= for {col, col_index} <- Enum.with_index(@cols)  do %>
            <th
              class={
                merge([
                  "text-left font-medium whitespace-nowrap",
                  text_size_classes(@row_size),
                  [
                    {:"#{inter_cell_border()}", @is_cell_border && col_index < Enum.count(@cols) - 1},
                    "cursor-pointer": col.sortable && @sorting_click
                  ],
                  col.width
                ])
              }
              phx-on-click={(col.sortable && col.name && @sorting_click) || nil}
              values={["sort-key": col.name, "sort-dir": toggle_sort_dir(@sort[:"#{col.name}"])]}
              data-testid={"sort-column-#{col.name}"}
            >
              <%= col.label %>
              <.icon
                :if={col.name && col.sortable}
                class={[
                  "text-[1.5em] transition-transform transition-200",
                  "rotate-180": @sort[:"#{col.name}"] != "ASC",
                  "opacity-0": !@sort[:"#{col.name}"]
                ]}
                name="arrows_up"
              />
            </th>
          <% end %>
        </tr>
      </thead>
      <tbody phx-attrs={@body_attrs}>
        <%= for {row_index, item} <- stream_data(assigns)  do %>
          <tr
            class={
              merge([
                (is_selected_item(item, @selected) && @selected_bg) || @row_bg,
                @hover_bg,
                {:"#{@even_row_bg}",
                 @is_zebra_style && !is_selected_item(item, @selected) && rem(row_index, 2) == 1},
                "cursor-pointer": @row_click
              ])
            }
            phx-on-click={(@row_click_cb && @row_click_cb.(item, row_index)) || @row_click}
            values={[selected: "#{item.id}", domid: dom_id(row_index, @id)]}
            data-testid={"row-#{row_index}"}
            id={dom_id(row_index, @id)}
          >
            <%= for {col, col_index} <- Enum.with_index(@cols)  do %>
              <td
                class={
                  merge([
                    "first:rounded-l-moon-s-sm last:rounded-r-moon-s-sm",
                    col.width,
                    text_size_classes(@row_size),
                    [
                      {:"#{inter_cell_border()}",
                       @is_cell_border && col_index < Enum.count(@cols) - 1}
                    ],
                    col.class
                  ])
                }
                data-testid={"row-#{row_index}-col-#{col_index}"}
              >
                <%= render_slot(col) %>
              </td>
            <% end %>
          </tr>
        <% end %>
      </tbody>
    </table>
    """
  end

  def sort_items(items, sort) do
    import Enum, only: [reverse: 1, reduce: 3, sort_by: 3]

    reverse(sort)
    |> reduce(items, fn {field, sort_dir}, list ->
      sort_by(
        list,
        & &1[field],
        &if sort_dir == "ASC" do
          &1 < &2
        else
          &1 > &2
        end
      )
    end)
  end

  defp toggle_sort_dir(sort_dir) do
    if "#{sort_dir}" == "ASC" do
      "DESC"
    else
      "ASC"
    end
  end

  defp is_selected_item(item, selected) do
    item[:is_selected] || is_selected(item[:id], selected)
  end

  defp is_selected(id, selected) when is_list(selected) do
    "#{id}" in selected
  end

  defp is_selected(id, selected) do
    "#{id}" == "#{selected}"
  end

  defp inter_cell_border() do
    "after:content-[\"\"] after:absolute after:w-px after:bg-beerus " <>
      "after:h-3/5 after:bottom-[20%] after:right-0 after:translate-x-[-50%] relative"
  end

  defp text_size_classes(row_size) do
    case row_size do
      "xs" -> "text-moon-12 py-1 px-2"
      "sm" -> "text-moon-14 py-1 px-3"
      "md" -> "text-moon-14 py-2 px-3"
      "lg" -> "text-moon-14 py-3 px-3"
      "xl" -> "text-moon-14 py-4 px-3"
      "2xl" -> "text-moon-14 py-5 px-3"
    end
  end

  defp stream_data(%{items: stream = %Phoenix.LiveView.LiveStream{}}) do
    stream
  end

  defp stream_data(%{items: items, sort: sort}) when is_list(items) do
    items |> add_index_as() |> sort_items(sort) |> Enum.with_index(&{&2, &1})
  end

  defp dom_id(id, _) when is_binary(id) do
    id
  end

  defp dom_id(id, id2) do
    "#{id2}-row-#{id}"
  end
end