policy-service/lib/policy_service/events/policy.ex

defmodule PolicyService.Events do
  @moduledoc """
  Events macro for adding JsonDecoder to domain events.
  """

  alias PolicyService.Aggregates.PolicyId

  defmacro __using__(_opts) do
    quote do
      defimpl Commanded.Serialization.JsonDecoder do
        def decode(
              %{id: %{org_id: org_id, policy_type: policy_type, application_id: application_id}} =
                event
            ) do
          %{event | id: PolicyId.new(org_id, policy_type, application_id)}
        end

        def decode(event), do: event
      end
    end
  end
end

defmodule PolicyService.Events.Policy do
  @moduledoc """
  Policy domain events.
  """

  defmodule PolicyApplicationSubmitted do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [
      :id,
      :submitted_by,
      :insured,
      :buyer,
      :policy_details,
      :selected_providers,
      :submitted_at
    ]
  end

  defmodule QuoteRequestSent do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [
      :id,
      :provider_id,
      :provider_email,
      :insured,
      :buyer,
      :policy_details,
      :requested_at
    ]
  end

  defmodule ProviderQuoteReceived do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [
      :id,
      :recorded_by,
      :provider_id,
      :quote_id,
      :premium,
      :coverage_details,
      :valid_until,
      :plans,
      :received_at
    ]
  end

  defmodule AllQuotesReceived do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [:id, :quote_count]
  end

  defmodule QuoteAccepted do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [:id, :accepted_by, :quote, :plan, :provider]
  end

  defmodule SolicitationRequestSent do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [:id, :plan, :provider_id]
  end

  defmodule PolicyIssued do
    use PolicyService.Events
    @derive Jason.Encoder
    defstruct [:id, :provider_policy_number, :effective_date, :expiry_date, :issued_at]
  end
end