defmodule Nulla.Repo.Migrations.CreateInstanceSettings do
  use Ecto.Migration

  def change do
    create table(:instance_settings, primary_key: false) do
      add :id, :integer, primary_key: true
      add :name, :string, default: "Nulla", null: false
      add :description, :text, default: "Freedom Social Network", null: false
      add :domain, :string, default: "localhost", null: false
      add :registration, :boolean, default: false, null: false
      add :max_characters, :integer, default: 5000, null: false
      add :max_upload_size, :integer, default: 50, null: false
      add :api_offset, :integer, default: 100, null: false
      add :public_key, :text
      add :private_key, :text

      timestamps()
    end

    execute "ALTER TABLE instance_settings ADD CONSTRAINT single_row CHECK (id = 1);"

    flush()

    execute(fn ->
      {public_key, private_key} = Nulla.KeyGen.gen()
      now = DateTime.utc_now()

      domain =
        Application.get_env(:nulla, NullaWeb.Endpoint, [])
        |> Keyword.get(:url, [])
        |> Keyword.get(:host, "localhost")

      esc = fn str -> "'#{String.replace(str, "'", "''")}'" end

      sql = """
      INSERT INTO instance_settings (
        id, name, description, domain, registration,
        max_characters, max_upload_size, api_offset,
        public_key, private_key, inserted_at, updated_at
      ) VALUES (
        1, 'Nulla', 'Freedom Social Network', '#{domain}', false,
        5000, 50, 100,
        #{esc.(public_key)}, #{esc.(private_key)},
        '#{now}', '#{now}'
      )
      """

      Ecto.Adapters.SQL.query!(Nulla.Repo, sql, [])
    end)
  end
end