defmodule Examples.ECompletion do
  @moduledoc """
  I am examples for the Elixir autocompletion system.
  """

  use ExExample

  import ExUnit.Assertions

  alias GtBridge.Completion

  @spec complete_enum_dot() :: [String.t()]
  example complete_enum_dot do
    results = Completion.complete("Enum.ma")

    assert Enum.any?(results, &String.starts_with?(&1, "Enum.map/2"))
    assert Enum.any?(results, &String.starts_with?(&1, "Enum.map_every/3"))

    results
  end

  @spec complete_alias() :: [String.t()]
  example complete_alias do
    results = Completion.complete("GenSer")

    assert "GenServer" in results

    results
  end

  @spec complete_erlang_module() :: [String.t()]
  example complete_erlang_module do
    results = Completion.complete(":erlan")

    assert ":erlang" in results

    results
  end

  @spec complete_erlang_dot() :: [String.t()]
  example complete_erlang_dot do
    results = Completion.complete(":erlang.no")

    assert ":erlang.node/0" in results

    results
  end

  @spec complete_with_bindings() :: [String.t()]
  example complete_with_bindings do
    results = Completion.complete("my_v", my_var: 42, my_val: "hello")

    assert "my_var" in results
    assert "my_val" in results

    results
  end

  @spec complete_struct() :: [String.t()]
  example complete_struct do
    results = Completion.complete("%MapS")

    assert "%MapSet" in results

    results
  end

  @spec complete_struct_fields() :: [String.t()]
  example complete_struct_fields do
    # GT sends "ho" as code (from { separator) and full source for context
    results = Completion.complete("ho", [], "%URI{ho")

    assert "host" in results
    assert "port" not in results

    # Without source context, falls back to normal local_or_var
    fallback = Completion.complete("ho")
    assert "host" not in fallback

    results
  end

  @spec complete_kernel_with_arity() :: [String.t()]
  example complete_kernel_with_arity do
    results = Completion.complete("is_")

    assert "is_atom/1" in results
    assert length(results) > 0

    results
  end
end