feat: Training Event Status Update and Validations (#26698)

* fix: training event employee status not updated on feedback submission

* feat: update attendees status on training event status update

* test: Training Event and Feedback

* chore: remove unused import
diff --git a/erpnext/hr/doctype/training_event/test_training_event.py b/erpnext/hr/doctype/training_event/test_training_event.py
index 313f90e..9b32136 100644
--- a/erpnext/hr/doctype/training_event/test_training_event.py
+++ b/erpnext/hr/doctype/training_event/test_training_event.py
@@ -11,21 +11,34 @@
 class TestTrainingEvent(unittest.TestCase):
 	def setUp(self):
 		create_training_program("Basic Training")
-		self.employee = make_employee("robert_loan@trainig.com")
-		self.employee2 = make_employee("suzie.tan@trainig.com")
+		employee = make_employee("robert_loan@trainig.com")
+		employee2 = make_employee("suzie.tan@trainig.com")
+		self.attendees = [
+			{"employee": employee},
+			{"employee": employee2}
+		]
 
-	def test_create_training_event(self):
-		if not frappe.db.get_value("Training Event", "Basic Training Event"):
-			frappe.get_doc({
-				"doctype": "Training Event",
-				"event_name": "Basic Training Event",
-				"training_program": "Basic Training",
-				"location": "Union Square",
-				"start_time": add_days(today(), 5),
-				"end_time": add_days(today(), 6),
-				"introduction": "Welcome to the Basic Training Event",
-				"employees": get_attendees(self.employee, self.employee2)
-			}).insert()
+	def test_training_event_status_update(self):
+		training_event = create_training_event(self.attendees)
+		training_event.submit()
+
+		training_event.event_status = "Completed"
+		training_event.save()
+		training_event.reload()
+
+		for entry in training_event.employees:
+			self.assertEqual(entry.status, "Completed")
+
+		training_event.event_status = "Scheduled"
+		training_event.save()
+		training_event.reload()
+
+		for entry in training_event.employees:
+			self.assertEqual(entry.status, "Open")
+
+	def tearDown(self):
+		frappe.db.rollback()
+
 
 def create_training_program(training_program):
 	if not frappe.db.get_value("Training Program", training_program):
@@ -35,8 +48,14 @@
 			"description": training_program
 		}).insert()
 
-def get_attendees(employee, employee2):
-	return [
-		{"employee": employee},
-		{"employee": employee2}
-	]
\ No newline at end of file
+def create_training_event(attendees):
+	return frappe.get_doc({
+		"doctype": "Training Event",
+		"event_name": "Basic Training Event",
+		"training_program": "Basic Training",
+		"location": "Union Square",
+		"start_time": add_days(today(), 5),
+		"end_time": add_days(today(), 6),
+		"introduction": "Welcome to the Basic Training Event",
+		"employees": attendees
+	}).insert()
\ No newline at end of file
diff --git a/erpnext/hr/doctype/training_event/training_event.py b/erpnext/hr/doctype/training_event/training_event.py
index 5064f03..e2c30cb 100644
--- a/erpnext/hr/doctype/training_event/training_event.py
+++ b/erpnext/hr/doctype/training_event/training_event.py
@@ -14,10 +14,25 @@
 		self.set_employee_emails()
 		self.validate_period()
 
+	def on_update_after_submit(self):
+		self.set_status_for_attendees()
+
 	def set_employee_emails(self):
 		self.employee_emails = ', '.join(get_employee_emails([d.employee
 			for d in self.employees]))
 
 	def validate_period(self):
 		if time_diff_in_seconds(self.end_time, self.start_time) <= 0:
-			frappe.throw(_('End time cannot be before start time'))
\ No newline at end of file
+			frappe.throw(_('End time cannot be before start time'))
+
+	def set_status_for_attendees(self):
+		if self.event_status == 'Completed':
+			for employee in self.employees:
+				if employee.attendance == 'Present' and employee.status != 'Feedback Submitted':
+					employee.status = 'Completed'
+
+		elif self.event_status == 'Scheduled':
+			for employee in self.employees:
+				employee.status = 'Open'
+
+		self.db_update_all()
diff --git a/erpnext/hr/doctype/training_feedback/test_training_feedback.py b/erpnext/hr/doctype/training_feedback/test_training_feedback.py
index 3455998..c30a3ad 100644
--- a/erpnext/hr/doctype/training_feedback/test_training_feedback.py
+++ b/erpnext/hr/doctype/training_feedback/test_training_feedback.py
@@ -5,8 +5,63 @@
 
 import frappe
 import unittest
-
-# test_records = frappe.get_test_records('Training Feedback')
-
+from erpnext.payroll.doctype.salary_structure.test_salary_structure import make_employee
+from erpnext.hr.doctype.training_event.test_training_event import create_training_program, create_training_event
 class TestTrainingFeedback(unittest.TestCase):
-	pass
+	def setUp(self):
+		create_training_program("Basic Training")
+		self.employee = make_employee("robert_loan@trainig.com")
+		self.employee2 = make_employee("suzie.tan@trainig.com")
+		self.attendees = [{"employee": self.employee}]
+
+	def test_employee_validations_for_feedback(self):
+		training_event = create_training_event(self.attendees)
+		training_event.submit()
+
+		training_event.event_status = "Completed"
+		training_event.save()
+		training_event.reload()
+
+		# should not allow creating feedback since employee2 was not part of the event
+		feedback = create_training_feedback(training_event.name, self.employee2)
+		self.assertRaises(frappe.ValidationError, feedback.save)
+
+		# cannot record feedback for absent employee
+		employee = frappe.db.get_value("Training Event Employee", {
+			"parent": training_event.name,
+			"employee": self.employee
+		}, "name")
+
+		frappe.db.set_value("Training Event Employee", employee, "attendance", "Absent")
+		feedback = create_training_feedback(training_event.name, self.employee)
+		self.assertRaises(frappe.ValidationError, feedback.save)
+
+	def test_training_feedback_status(self):
+		training_event = create_training_event(self.attendees)
+		training_event.submit()
+
+		training_event.event_status = "Completed"
+		training_event.save()
+		training_event.reload()
+
+		feedback = create_training_feedback(training_event.name, self.employee)
+		feedback.submit()
+
+		status = frappe.db.get_value("Training Event Employee", {
+			"parent": training_event.name,
+			"employee": self.employee
+		}, "status")
+
+		self.assertEqual(status, "Feedback Submitted")
+
+	def tearDown(self):
+		frappe.db.rollback()
+
+
+def create_training_feedback(event, employee):
+	return frappe.get_doc({
+		"doctype": "Training Feedback",
+		"training_event": event,
+		"employee": employee,
+		"feedback": "Test"
+	})
\ No newline at end of file
diff --git a/erpnext/hr/doctype/training_feedback/training_feedback.py b/erpnext/hr/doctype/training_feedback/training_feedback.py
index 1a33450..0d32de7 100644
--- a/erpnext/hr/doctype/training_feedback/training_feedback.py
+++ b/erpnext/hr/doctype/training_feedback/training_feedback.py
@@ -11,15 +11,35 @@
 	def validate(self):
 		training_event = frappe.get_doc("Training Event", self.training_event)
 		if training_event.docstatus != 1:
-			frappe.throw(_('{0} must be submitted').format(_('Training Event')))
+			frappe.throw(_("{0} must be submitted").format(_("Training Event")))
+
+		emp_event_details = frappe.db.get_value("Training Event Employee", {
+			"parent": self.training_event,
+			"employee": self.employee
+		}, ["name", "attendance"], as_dict=True)
+
+		if not emp_event_details:
+			frappe.throw(_("Employee {0} not found in Training Event Participants.").format(
+				frappe.bold(self.employee_name)))
+
+		if emp_event_details.attendance == "Absent":
+			frappe.throw(_("Feedback cannot be recorded for an absent Employee."))
 
 	def on_submit(self):
-		training_event = frappe.get_doc("Training Event", self.training_event)
-		event_status = None
-		for e in training_event.employees:
-			if e.employee == self.employee:
-				event_status = 'Feedback Submitted'
-				break
+		employee = frappe.db.get_value("Training Event Employee", {
+			"parent": self.training_event,
+			"employee": self.employee
+		})
 
-		if event_status:
-			frappe.db.set_value("Training Event", self.training_event, "event_status", event_status)
+		if employee:
+			frappe.db.set_value("Training Event Employee", employee, "status", "Feedback Submitted")
+
+	def on_cancel(self):
+		employee = frappe.db.get_value("Training Event Employee", {
+			"parent": self.training_event,
+			"employee": self.employee
+		})
+
+		if employee:
+			frappe.db.set_value("Training Event Employee", employee, "status", "Completed")
+