neiam /gitgud

defmodule GitGud.Organizations.TeamRepository do
  use Ecto.Schema
  import Ecto.Changeset

  alias GitGud.Organizations.Team
  alias GitGud.Repositories.Repository

  @valid_permissions ~w(read triage write maintain admin)

  schema "team_repositories" do
    field :permission, :string, default: "read"

    belongs_to :team, Team
    belongs_to :repository, Repository

    timestamps(type: :utc_datetime)
  end

  def changeset(tr, attrs) do
    tr
    |> cast(attrs, [:team_id, :repository_id, :permission])
    |> validate_required([:team_id, :repository_id, :permission])
    |> validate_inclusion(:permission, @valid_permissions)
    |> unique_constraint(:repository_id,
      name: :team_repositories_team_id_repository_id_index
    )
  end

  def valid_permissions, do: @valid_permissions

  @doc "Permission rank for comparison. Higher = more privileged."
  def rank("read"), do: 1
  def rank("triage"), do: 2
  def rank("write"), do: 3
  def rank("maintain"), do: 4
  def rank("admin"), do: 5
  def rank(_), do: 0
end