defmodule Slack do
  @moduledoc ~S"""
  Documentation for Slacks.
  """

  @doc ~S"""
  Post a message to slack.
  """
  @spec post_message(String.t(), String.t(), String.t(), Keyword.t()) :: any
  def post_message(token, channel, message, opts \\ []) do
    params =
      [
        text: message,
        token: token,
        channel: channel,
        thread_ts: opts[:thread],
        blocks: opts[:blocks]
      ]
      |> Enum.reject(fn {_, v} -> is_nil(v) or v == [] end)
      |> Map.new()

    HTTPX.post(
      "https://slack.com/api/chat.postMessage",
      {:json, params},
      headers: [{"Authorization", "Bearer #{token}"}]
    )
  end

  @doc ~S"""
  Post an ephemeral message to slack.
  """
  @spec post_ephemeral(String.t(), String.t(), String.t(), String.t(), Keyword.t()) :: any
  def post_ephemeral(token, channel, user, message, opts \\ []) do
    params =
      [
        text: message,
        token: token,
        channel: channel,
        user: user,
        thread_ts: opts[:thread],
        blocks: opts[:blocks]
      ]
      |> Enum.reject(fn {_, v} -> is_nil(v) or v == [] end)
      |> Map.new()

    HTTPX.post(
      "https://slack.com/api/chat.postEphemeral",
      {:json, params},
      headers: [{"Authorization", "Bearer #{token}"}]
    )
  end

  @doc ~S"""
  Post a message to slack.
  """
  @spec chat_update(String.t(), String.t(), String.t(), String.t(), Keyword.t()) :: any
  def chat_update(token, channel, ts, message, opts \\ []) do
    params =
      [
        text: message,
        token: token,
        channel: channel,
        ts: ts,
        thread_ts: opts[:thread],
        blocks: opts[:blocks]
      ]
      |> Enum.reject(fn {_, v} -> is_nil(v) or v == [] end)
      |> Map.new()

    HTTPX.post(
      "https://slack.com/api/chat.update",
      {:json, params},
      headers: [{"Authorization", "Bearer #{token}"}]
    )
  end

  @doc ~S"""
  Upload a file to slack.
  """
  @spec upload_file(String.t(), String.t(), binary, Keyword.t()) :: any
  def upload_file(token, channel, data, opts \\ []) do
    params =
      [
        token: token,
        channels: channel,
        thread_ts: opts[:thread],
        title: opts[:title],
        filetype: opts[:filetype] || "text/plain",
        initial_comment: opts[:comment]
      ]
      |> Enum.reject(fn {_, v} -> is_nil(v) or v == [] end)
      |> Map.new()

    HTTPX.post(
      "https://slack.com/api/files.upload",
      {:multipart, %{"file" => {:binfile, data}}},
      params: params
    )
  end
end