feat: subscription add ons

lms/subscription_utils.py

@@ -0,0 +1,45 @@
+import frappe
+
+
+@frappe.whitelist(allow_guest=True)
+def get_add_on_details(plan: str) -> dict[str, int]:
+    """
+    Returns the number of courses and course members to be billed under add-ons for SAAS subscription
+    """
+
+    return {
+        "courses": get_add_on_courses(plan),
+        "members": get_add_on_members(plan)
+    }
+
+
+def get_published_courses() -> int:
+    return frappe.db.count("LMS Course", {"published": 1})
+
+
+def get_add_on_courses(plan: str) -> int:
+    COURSE_LIMITS = {"Lite": 5, "Essential": 20}
+    add_on_courses = 0
+    courses_included_in_plans = COURSE_LIMITS.get(plan)
+
+    if courses_included_in_plans:
+        published_courses = get_published_courses()
+        add_on_courses = published_courses - courses_included_in_plans if published_courses > courses_included_in_plans else 0
+
+    return add_on_courses
+
+
+def get_add_on_members(plan: str) -> int:
+    MEMBER_LIMITS = {"Lite": 100, "Essential": 500}
+    add_on_members = 0
+    members_included_in_plans = MEMBER_LIMITS.get(plan)
+
+    if members_included_in_plans:
+        active_members = get_members()
+        add_on_members = active_members - members_included_in_plans if active_members > members_included_in_plans else 0
+
+    return add_on_members
+
+
+def get_members() -> int:
+    return frappe.db.count("LMS Batch Membership")