# Copyright (c) 2021, Frappe Technologies Pvt. Ltd. and Contributors
# License: GNU General Public License v3. See license.txt

from datetime import timedelta

import frappe
from frappe.tests import IntegrationTestCase
from frappe.utils import add_months, getdate

from erpnext.setup.doctype.employee.test_employee import make_employee

from hrms.controllers.employee_reminders import send_holidays_reminder_in_advance
from hrms.hr.doctype.hr_settings.hr_settings import set_proceed_with_frequency_change
from hrms.hr.utils import get_holidays_for_employee


class TestEmployeeReminders(IntegrationTestCase):
	@classmethod
	def setUpClass(cls):
		super().setUpClass()
		from erpnext.setup.doctype.holiday_list.test_holiday_list import make_holiday_list

		# Create a test holiday list
		test_holiday_dates = cls.get_test_holiday_dates()
		test_holiday_list = make_holiday_list(
			"TestHolidayRemindersList",
			holiday_dates=[
				{"holiday_date": test_holiday_dates[0], "description": "test holiday1"},
				{"holiday_date": test_holiday_dates[1], "description": "test holiday2"},
				{"holiday_date": test_holiday_dates[2], "description": "test holiday3", "weekly_off": 1},
				{"holiday_date": test_holiday_dates[3], "description": "test holiday4"},
				{"holiday_date": test_holiday_dates[4], "description": "test holiday5"},
				{"holiday_date": test_holiday_dates[5], "description": "test holiday6"},
			],
			from_date=getdate() - timedelta(days=10),
			to_date=getdate() + timedelta(weeks=5),
		)

		test_employee = frappe.get_doc("Employee", make_employee("test@gopher.io", company="_Test Company"))

		# Attach the holiday list to employee
		test_employee.holiday_list = test_holiday_list.name
		test_employee.save()

		# Attach to class
		cls.test_employee = test_employee
		cls.test_holiday_dates = test_holiday_dates

		# Employee without holidays in this month/week
		test_employee_2 = make_employee("test@empwithoutholiday.io", company="_Test Company")
		test_employee_2 = frappe.get_doc("Employee", test_employee_2)

		test_holiday_list = make_holiday_list(
			"TestHolidayRemindersList2",
			holiday_dates=[
				{"holiday_date": add_months(getdate(), 1), "description": "test holiday1"},
			],
			from_date=add_months(getdate(), -2),
			to_date=add_months(getdate(), 2),
		)
		test_employee_2.holiday_list = test_holiday_list.name
		test_employee_2.save()

		cls.test_employee_2 = test_employee_2
		cls.holiday_list_2 = test_holiday_list

	@classmethod
	def get_test_holiday_dates(cls):
		today_date = getdate()
		return [
			today_date,
			today_date - timedelta(days=4),
			today_date - timedelta(days=3),
			today_date + timedelta(days=1),
			today_date + timedelta(days=3),
			today_date + timedelta(weeks=3),
		]

	def setUp(self):
		# Clear Email Queue
		frappe.db.sql("delete from `tabEmail Queue`")
		frappe.db.sql("delete from `tabEmail Queue Recipient`")

	def test_is_holiday(self):
		from erpnext.setup.doctype.employee.employee import is_holiday

		self.assertTrue(is_holiday(self.test_employee.name))
		self.assertTrue(is_holiday(self.test_employee.name, date=self.test_holiday_dates[1]))
		self.assertFalse(is_holiday(self.test_employee.name, date=getdate() - timedelta(days=1)))

		# Test weekly_off holidays
		self.assertTrue(is_holiday(self.test_employee.name, date=self.test_holiday_dates[2]))
		self.assertFalse(
			is_holiday(self.test_employee.name, date=self.test_holiday_dates[2], only_non_weekly=True)
		)

		# Test with descriptions
		has_holiday, descriptions = is_holiday(self.test_employee.name, with_description=True)
		self.assertTrue(has_holiday)
		self.assertTrue("test holiday1" in descriptions)

	def test_birthday_reminders(self):
		employee = frappe.get_doc("Employee", frappe.db.sql_list("select name from tabEmployee limit 1")[0])
		employee.date_of_birth = "1992" + frappe.utils.nowdate()[4:]
		employee.company_email = "test@example.com"
		employee.company = "_Test Company"
		employee.save()

		from hrms.controllers.employee_reminders import (
			get_employees_who_are_born_today,
			send_birthday_reminders,
		)

		employees_born_today = get_employees_who_are_born_today()
		self.assertTrue(employees_born_today.get("_Test Company"))

		hr_settings = frappe.get_doc("HR Settings", "HR Settings")
		hr_settings.send_birthday_reminders = 1
		hr_settings.save()

		send_birthday_reminders()

		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertTrue("Subject: Birthday Reminder" in email_queue[0].message)

	def test_work_anniversary_reminders(self):
		from hrms.controllers.employee_reminders import (
			get_employees_having_an_event_today,
			send_work_anniversary_reminders,
		)

		make_employee(
			"test_emp_work_anniversary@gmail.com",
			company="_Test Company",
			date_of_joining=frappe.utils.add_years(getdate(), -2),
		)

		employees_having_work_anniversary = get_employees_having_an_event_today("work_anniversary")
		employees = employees_having_work_anniversary.get("_Test Company") or []
		user_ids = []
		for entry in employees:
			user_ids.append(entry.user_id)

		self.assertTrue("test_emp_work_anniversary@gmail.com" in user_ids)

		hr_settings = frappe.get_doc("HR Settings", "HR Settings")
		hr_settings.send_work_anniversary_reminders = 1
		hr_settings.save()

		send_work_anniversary_reminders()

		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertTrue("Subject: Work Anniversary Reminder" in email_queue[0].message)

	def test_work_anniversary_reminder_not_sent_for_0_years(self):
		make_employee(
			"test_work_anniversary_2@gmail.com",
			date_of_joining=getdate(),
			company="_Test Company",
		)

		from hrms.controllers.employee_reminders import get_employees_having_an_event_today

		employees_having_work_anniversary = get_employees_having_an_event_today("work_anniversary")
		employees = employees_having_work_anniversary.get("_Test Company") or []
		user_ids = []
		for entry in employees:
			user_ids.append(entry.user_id)

		self.assertTrue("test_work_anniversary_2@gmail.com" not in user_ids)

	def test_send_holidays_reminder_in_advance(self):
		setup_hr_settings("Weekly")

		holidays = get_holidays_for_employee(
			self.test_employee.get("name"),
			getdate(),
			getdate() + timedelta(days=3),
			only_non_weekly=True,
			raise_exception=False,
		)

		send_holidays_reminder_in_advance(self.test_employee.get("name"), holidays)

		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertEqual(len(email_queue), 1)
		self.assertTrue("Holidays this Week." in email_queue[0].message)

	def test_advance_holiday_reminders_monthly(self):
		from hrms.controllers.employee_reminders import send_reminders_in_advance_monthly

		setup_hr_settings("Monthly")

		# disable emp 2, set same holiday list
		frappe.db.set_value(
			"Employee",
			self.test_employee_2.name,
			{"status": "Left", "holiday_list": self.test_employee.holiday_list},
		)

		send_reminders_in_advance_monthly()
		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertTrue(len(email_queue) > 0)

		# even though emp 2 has holiday, non-active employees should not be recipients
		recipients = frappe.db.get_all("Email Queue Recipient", pluck="recipient")
		self.assertTrue(self.test_employee_2.user_id not in recipients)

		# teardown: enable emp 2
		frappe.db.set_value(
			"Employee",
			self.test_employee_2.name,
			{"status": "Active", "holiday_list": self.holiday_list_2.name},
		)

	def test_advance_holiday_reminders_weekly(self):
		from hrms.controllers.employee_reminders import send_reminders_in_advance_weekly

		setup_hr_settings("Weekly")

		# disable emp 2, set same holiday list
		frappe.db.set_value(
			"Employee",
			self.test_employee_2.name,
			{"status": "Left", "holiday_list": self.test_employee.holiday_list},
		)

		send_reminders_in_advance_weekly()
		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertTrue(len(email_queue) > 0)

		# even though emp 2 has holiday, non-active employees should not be recipients
		recipients = frappe.db.get_all("Email Queue Recipient", pluck="recipient")
		self.assertTrue(self.test_employee_2.user_id not in recipients)

		# teardown: enable emp 2
		frappe.db.set_value(
			"Employee",
			self.test_employee_2.name,
			{"status": "Active", "holiday_list": self.holiday_list_2.name},
		)

	def test_reminder_not_sent_if_no_holdays(self):
		setup_hr_settings("Monthly")

		# reminder not sent if there are no holidays
		holidays = get_holidays_for_employee(
			self.test_employee_2.get("name"),
			getdate(),
			getdate() + timedelta(days=3),
			only_non_weekly=True,
			raise_exception=False,
		)
		send_holidays_reminder_in_advance(self.test_employee_2.get("name"), holidays)
		email_queue = frappe.db.sql("""select * from `tabEmail Queue`""", as_dict=True)
		self.assertEqual(len(email_queue), 0)


def setup_hr_settings(frequency=None):
	# Get HR settings and enable advance holiday reminders
	hr_settings = frappe.get_doc("HR Settings", "HR Settings")
	hr_settings.send_holiday_reminders = 1
	set_proceed_with_frequency_change()
	hr_settings.frequency = frequency or "Weekly"
	hr_settings.save()