config(constant): add cash flow group kinds

app/Config/Constants.php

@@ -110,6 +110,37 @@
 define("SEARCH_WITH_DELETED", "WITH_DELETED");
 define("SEARCH_ONLY_DELETED", "ONLY_DELETED");
 
+/*
+ | --------------------------------------------------------------------------
+ | Cash Flow Group Kinds
+ | --------------------------------------------------------------------------
+ |
+ | There are different cash flow group kinds that the system can handle.
+ | - UNKNOWN_CASH_FLOW_GROUP_KIND. Cash flow group that may represent other kinds not supported
+ |   by the system at the current version. This case may happen when the system downgraded.
+ | - LIQUID_CASH_FLOW_GROUP_KIND. Cash flow group kind that may hold cash and other
+|   cash-equivalent accounts.
+ | - ILLIQUID_CASH_FLOW_GROUP_KIND. Cash flow group kind that may hold that are hard to convert
+ |   back into cash.
+ |
+ | When the user creates a cash flow group, certain kinds can be accepted by the server.
+ | When the server finds a cash flow group kind not existing in the current version,
+ | it will be labeled as unknown.
+ */
+define("UNKNOWN_CASH_FLOW_GROUP_KIND", "unknown");
+define("LIQUID_CASH_FLOW_GROUP_KIND", "liquid");
+define("ILLIQUID_CASH_FLOW_GROUP_KIND", "illiquid");
+
+define("ACCEPTABLE_CASH_FLOW_GROUP_KINDS", [
+    LIQUID_CASH_FLOW_GROUP_KIND,
+    ILLIQUID_CASH_FLOW_GROUP_KIND,
+]);
+
+define("CASH_FLOW_GROUP_KINDS", [
+    UNKNOWN_CASH_FLOW_GROUP_KIND,
+    ...ACCEPTABLE_CASH_FLOW_GROUP_KINDS
+]);
+
 /*
  | --------------------------------------------------------------------------
  | Account Kinds