refactor: Reduce function complexity and nesting depth

- Extract helper functions from process_chunk to reduce nesting
- Extract format_error_message from extract_changeset_error
- Split extract_error_message into smaller functions to reduce complexity
- Fixes Credo refactoring opportunities

lib/mv_web/live/member_live/form.ex

@@ -355,48 +355,65 @@ defmodule MvWeb.MemberLive.Form do
 
   # Extracts a user-friendly error message from form errors
   defp extract_error_message(form) do
-    # Try to extract message from source errors first
     source_errors = get_source_errors(form)
 
-    case source_errors do
-      [%Ash.Error.Invalid{errors: errors} | _] when is_list(errors) ->
-        # Extract first error message
-        case List.first(errors) do
-          %{message: message} when is_binary(message) ->
-            gettext("Validation failed: %{message}", message: message)
+    cond do
+      has_invalid_error?(source_errors) ->
+        extract_invalid_error_message(source_errors)
 
-          %{field: field, message: message} when is_binary(message) ->
-            gettext("Validation failed: %{field} %{message}", field: field, message: message)
+      has_other_error?(source_errors) ->
+        extract_other_error_message(source_errors)
 
-          _ ->
-            gettext("Validation failed. Please check your input.")
-        end
+      has_form_errors?(form) ->
+        gettext("Please correct the errors in the form and try again.")
 
-      [error | _] ->
-        # Try to extract message from other error types
-        case error do
-          %{message: message} when is_binary(message) ->
-            message
+      true ->
+        gettext("Failed to save member. Please try again.")
+    end
+  end
 
-          error when is_struct(error) ->
-            # Try to use Ash.ErrorKind protocol if available
-            try do
-              Ash.ErrorKind.message(error)
-            rescue
-              Protocol.UndefinedError -> gettext("Failed to save member. Please try again.")
-            end
+  # Checks if source errors contain an Ash.Error.Invalid
+  defp has_invalid_error?([%Ash.Error.Invalid{errors: errors} | _]) when is_list(errors), do: true
+  defp has_invalid_error?(_), do: false
 
-          _ ->
-            gettext("Failed to save member. Please try again.")
-        end
+  # Extracts message from Ash.Error.Invalid
+  defp extract_invalid_error_message([%Ash.Error.Invalid{errors: errors} | _]) do
+    case List.first(errors) do
+      %{message: message} when is_binary(message) ->
+        gettext("Validation failed: %{message}", message: message)
+
+      %{field: field, message: message} when is_binary(message) ->
+        gettext("Validation failed: %{field} %{message}", field: field, message: message)
 
       _ ->
-        # Check if there are any field errors in the form
-        if has_form_errors?(form) do
-          gettext("Please correct the errors in the form and try again.")
-        else
-          gettext("Failed to save member. Please try again.")
-        end
+        gettext("Validation failed. Please check your input.")
+    end
+  end
+
+  # Checks if source errors contain other error types
+  defp has_other_error?([_ | _]), do: true
+  defp has_other_error?(_), do: false
+
+  # Extracts message from other error types
+  defp extract_other_error_message([error | _]) do
+    cond do
+      Map.has_key?(error, :message) and is_binary(error.message) ->
+        error.message
+
+      is_struct(error) ->
+        extract_struct_error_message(error)
+
+      true ->
+        gettext("Failed to save member. Please try again.")
+    end
+  end
+
+  # Extracts message from struct error using Ash.ErrorKind protocol
+  defp extract_struct_error_message(error) do
+    try do
+      Ash.ErrorKind.message(error)
+    rescue
+      Protocol.UndefinedError -> gettext("Failed to save member. Please try again.")
     end
   end