defmodule MusicLibraryWeb.CollectionController do
  use MusicLibraryWeb, :controller

  alias MusicLibrary.Collection

  def latest(conn, _params) do
    latest_record = Collection.get_latest_record!()

    render(conn, :show, record: latest_record)
  end

  def random(conn, _params) do
    random_record = Collection.get_random_record!()

    render(conn, :show, record: random_record)
  end

  def on_this_day(conn, params) do
    current_date =
      case Map.get(params, "date") do
        nil -> Date.utc_today()
        date_string -> Date.from_iso8601!(date_string)
      end

    records_on_this_day = Collection.get_records_on_this_day(current_date)

    render(conn, :on_this_day, records: records_on_this_day)
  end

  def index(conn, params) do
    query = normalize_query(params["q"])
    limit = parse_int(params["limit"], 20)
    offset = parse_int(params["offset"], 0)

    total = Collection.search_records_count(query)

    records = Collection.search_records(query, limit: limit, offset: offset)

    render(conn, :index, total: total, limit: limit, offset: offset, records: records)
  end

  defp parse_int(nil, default), do: default

  defp parse_int(value, default) when is_binary(value) do
    case Integer.parse(value) do
      {int, ""} -> int
      _ -> default
    end
  end

  defp parse_int(_, default), do: default

  defp normalize_query(nil), do: ""
  defp normalize_query(""), do: ""
  defp normalize_query(query), do: query
end