defmodule MyPlugin.ContractTest do
  @moduledoc """
  Contract compliance tests.

  These verify that the plugin conforms to the Tribes plugin contract.
  When Tribes.Plugin.ContractTest is available (host dep loaded),
  replace this file with:

      defmodule MyPlugin.ContractTest do
        use Tribes.Plugin.ContractTest,
          plugin: MyPlugin.Plugin,
          otp_app: :my_plugin
      end

  Until then, this file provides a standalone equivalent.
  """

  use ExUnit.Case, async: true

  @plugin MyPlugin.Plugin
  @manifest_path Path.join(__DIR__, "../manifest.json") |> Path.expand()

  setup_all do
    manifest = @manifest_path |> File.read!() |> Jason.decode!()
    spec = @plugin.register(%{pubsub: nil, repo: nil})
    %{manifest: manifest, spec: spec}
  end

  test "runtime provides matches manifest provides", %{manifest: manifest, spec: spec} do
    normalise = fn cap ->
      if String.contains?(cap, "@"), do: cap, else: "#{cap}@1"
    end

    manifest_caps = manifest["provides"] |> Enum.map(normalise) |> Enum.sort()
    runtime_caps = spec.provides |> Enum.map(normalise) |> Enum.sort()

    assert manifest_caps == runtime_caps,
           "manifest provides #{inspect(manifest_caps)} != runtime provides #{inspect(runtime_caps)}"
  end

  test "runtime requires matches manifest requires", %{manifest: manifest, spec: spec} do
    normalise = fn cap ->
      if String.contains?(cap, "@"), do: cap, else: "#{cap}@1"
    end

    manifest_caps = manifest["requires"] |> Enum.map(normalise) |> Enum.sort()
    runtime_caps = spec.requires |> Enum.map(normalise) |> Enum.sort()

    assert manifest_caps == runtime_caps,
           "manifest requires #{inspect(manifest_caps)} != runtime requires #{inspect(runtime_caps)}"
  end

  test "spec has all required keys", %{spec: spec} do
    required_keys = [
      :name,
      :version,
      :provides,
      :requires,
      :nav_items,
      :pages,
      :children,
      :global_js,
      :global_css,
      :migrations_path,
      :hooks
    ]

    for key <- required_keys do
      assert Map.has_key?(spec, key), "spec must contain #{inspect(key)}"
    end
  end

  test "name in spec matches manifest", %{manifest: manifest, spec: spec} do
    assert spec.name == manifest["name"]
  end

  test "migrations_path exists if manifest declares migrations", %{manifest: manifest, spec: spec} do
    if manifest["migrations"] do
      assert is_binary(spec.migrations_path),
             "migrations_path must be set when manifest declares migrations: true"

      assert File.dir?(spec.migrations_path),
             "migrations_path #{inspect(spec.migrations_path)} must be an existing directory"
    end
  end
end