defmodule Emoj do
  @moduledoc """
  Exposes a function to find relevant emoji from text
  """

  @url "emoji.getdango.com/api/emoji"

  alias Poison.Parser

  @doc """
  Searches relevant emoji from the given `text`

  ## Example

      Emoj.search("I love chicken")
      {:ok, ["🐔", "🍗", "🐓", "🐥", "🐤", "🐣", "🍖", "😋", "😍", "👅"]}
  """
  @spec search(String.t) :: {:ok, list(String.t)} | {:error, any}
  def search(text) do
    encoded = URI.encode(text)
    query = "#{@url}?q=#{encoded}"

    query
    |> HTTPoison.get([], [follow_redirect: true])
    |> handle_response
    |> handle_body
  end

  defp handle_response({:ok, %{status_code: 200, body: body}}) do
    {:ok, Parser.parse!(body)}
  end

  defp handle_response({:error, %HTTPoison.Error{id: _id, reason: reason}}) do
    {:error, reason}
  end

  defp handle_body({:ok, body}) do
    result =
      body
      |> Map.get("results")
      |> Enum.map(fn(x) -> x["text"] end)

    {:ok, result}
  end

  defp handle_body({:error, reason}), do: {:error, reason}
end