# Dexcord example bot: raw events, a prefix command, and a slash command.
#
# Run it from the repo root with:
#
#     DISCORD_TOKEN=your-bot-token elixir examples/echo_bot.exs
#
# Optionally set DEV_GUILD_ID to a guild id to register the `/ping` slash
# command to that guild only (instant propagation, good for development).
# Without it, the command registers globally (propagation can take ~1h).
#
# What it demonstrates:
#
#   * `intents: :all` - every documented gateway intent, including the
#     privileged ones. If you see a 4014 (disallowed intents) error in the
#     logs, enable SERVER MEMBERS / PRESENCE / MESSAGE CONTENT under
#     Bot -> Privileged Gateway Intents in the Discord Developer Portal (see
#     the README's "Privileged intents" section).
#   * A raw `Dexcord.Handler` that logs every `MESSAGE_CREATE` and sets the
#     bot's presence on `READY`.
#   * A `!ping` prefix command via `Dexcord.Prefix.Router`.
#   * A `/ping` slash command that responds ephemerally.
#
# This script does not connect to Discord on its own - it only starts if you
# provide a real DISCORD_TOKEN and run it, at which point it connects for
# real and stays running until you stop it (Ctrl-C twice).

Mix.install([
  {:dexcord, path: Path.expand("..", __DIR__)}
])

defmodule EchoBot.Commands do
  @moduledoc false
  use Dexcord.Prefix.Router

  def handle_command("ping", _args, msg) do
    Dexcord.Api.create_message(msg["channel_id"], "pong")
  end
end

defmodule EchoBot.Slash do
  @moduledoc false
  use Dexcord.Slash

  def commands do
    [%{name: "ping", description: "Replies with pong (only you can see it)."}]
  end

  def handle_interaction("ping", interaction) do
    Dexcord.Slash.respond(interaction, %{content: "pong", ephemeral: true})
  end
end

defmodule EchoBot.Handler do
  @moduledoc false
  use Dexcord.Handler

  def handle_event({:READY, data}) do
    IO.puts("Ready as #{get_in(data, ["user", "username"])}")

    Dexcord.update_presence(%{
      "since" => nil,
      "activities" => [%{"name" => "!ping / /ping", "type" => 0}],
      "status" => "online",
      "afk" => false
    })
  end

  def handle_event({:MESSAGE_CREATE, msg}) do
    IO.puts("#{get_in(msg, ["author", "username"])}: #{msg["content"]}")
    Dexcord.Prefix.dispatch(msg, prefix: "!", to: EchoBot.Commands)
  end
end

token = System.fetch_env!("DISCORD_TOKEN")
dev_guild_id = System.get_env("DEV_GUILD_ID")

children = [
  {Dexcord,
   token: token,
   handler: EchoBot.Handler,
   intents: :all,
   slash: EchoBot.Slash,
   slash_guild_ids: if(dev_guild_id, do: [dev_guild_id])}
]

{:ok, _supervisor} =
  Supervisor.start_link(children, strategy: :one_for_one, name: EchoBot.Supervisor)

Process.sleep(:infinity)