' Copyright (C) 2024 Declan Teevan
'
' This program is free software: you can redistribute it and/or modify
' it under the terms of the GNU Affero General Public License as published by
' the Free Software Foundation, either version 3 of the License, or
' (at your option) any later version.
'
' This program is distributed in the hope that it will be useful,
' but WITHOUT ANY WARRANTY; without even the implied warranty of
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
' GNU Affero General Public License for more details.
'
' You should have received a copy of the GNU Affero General Public License
' along with this program.  If not, see <https://www.gnu.org/licenses/>.

@startuml placeordersaga
!theme mars

|Order|
start
:OrderCreatedEvent;

|Product|
:ProductPriceQuoteEvent;
if (type) is (<color:red>UNAVAILABLE) then
  |Order|
  :<color:red>OrderRejectedEvent;
  kill
else (<color:green>AVAILABLE)
endif

|Order|
:OrderPendingEvent;

|Warehouse|
:StockReservationEvent;
if (type) is (<color:red>INSUFFICIENT_STOCK) then
  |Order|
  :<color:red>OrderRejectedEvent;
  kill
else (<color:green>STOCK_RESERVED)
endif

|Shipping|
:ShipmentAllocationEvent;
if (type) is (<color:red>FAILED) then
  |Warehouse|
  :StockReservationEvent\n<color:grey>type: STOCK_RETURNED;

  |Order|
  :<color:red>OrderRejectedEvent;
  kill
else (<color:green>ALLOCATED)
endif

|Payment|
:PaymentProcessedEvent;
if (type) is (<color:red>FAILED) then
  |Shipping|
  :ShipmentAllocationEvent\n<color:grey>type: ALLOCATION_RELEASED;

  |Warehouse|
  :StockReservationEvent\n<color:grey>type: STOCK_RETURNED;

  |Order|
  :<color:red>OrderRejectedEvent;
  kill
else (<color:green>SUCCESS)
endif

fork
  |Warehouse|
  :StockReservationEvent\n<color:grey>type: STOCK_CONSUMED;
  kill
fork again
  |Order|
  :<color:green>OrderApprovedEvent;
  stop
end merge

@enduml