defmodule Forge.Rpc do
  @moduledoc """
  RPC lib to send tx. Using localhost:26657 for simplicity.
  """

  @rpc_host "localhost:26657"

  require Logger

  @doc """
  Send out the signed transaction with tendermint http RPC interface: localhost:26657/broadcast_tx_commit?tx=<tx>
  """
  @spec send(Forge.TransactionMessage.t()) :: map() | nil
  def send(tx) do
    url =
      "http://#{@rpc_host}/broadcast_tx_commit?tx=\"#{Base.url_encode64(tx, padding: false)}\""

    get_url(url)
  end

  def get_tx(hash) do
    url = "http://#{@rpc_host}/tx?hash=0x#{hash}"
    get_url(url)
  end

  def query_tx(key, value) do
    url = "http://#{@rpc_host}/tx_search?query=\"#{key}='#{value}'\""
    get_url(url)
  end

  # private function
  defp get_url(url) do
    case HTTPoison.get(url) do
      {:ok, %HTTPoison.Response{body: body}} ->
        Jason.decode!(body)

      {:error, error} ->
        Logger.error("Failed to call tendermint RPC. Error: #{inspect(error)}")
        nil
    end
  end
end