#!/usr/bin/env python3
import unittest
from checklib import Result, Check
from contextlib import redirect_stdout
from textwrap import dedent
import io
import sys

def make_check(
		result=Result.UNKNOWN,
		short_message='Just a message',
		long_message = None):
	class Result(Check):
		def check(self):
			self.short_status = short_message
			self.result=result
			if long_message is not None:
				self.long_status = long_message
	return Result

class DefaultCheck(Check): pass
class ExceptionInInit(Check):
	def __init__(self):
		raise ValueError('whatever')

class ExceptionInCheck(Check):
	def check(self):
		raise ValueError('whatever')

class ExitInInit(Check):
	def __init__(self):
		sys.exit(42)

class ExitInCheck(Check):
	def check(self):
		sys.exit(42)

class T(unittest.TestCase):
	def setUp(self):
		self.passing_check = make_check(Result.OK)
		self.warning_check = make_check(Result.WARNING)
		self.critical_check = make_check(Result.CRITICAL)
		self.unknown_check = make_check(Result.UNKNOWN)
		self.check_without_status = make_check(Result.OK, short_message = None)

		# Multiline status:
		# Ref: IT Crowd :-)
		self.short_message = 'Subject: Fire!'
		self.long_message = dedent('''\
			Dear Sir / Madam,
			
			I am writing to inform
			you of a fire, that has broken…
			No, that\'s too formal.''')
		self.multiline_check = make_check(Result.OK, self.short_message, self.long_message)
		# Other checks are given as separate classes.
		self.all_checks = [
			self.unknown_check,
			ExceptionInCheck,
			ExceptionInInit,
			ExitInCheck,
			ExitInInit,
			DefaultCheck,
			self.check_without_status,
			self.multiline_check,
			self.passing_check,
			self.warning_check,
			self.critical_check,
		]
	
	def test_run_exits(self):
		for check in self.all_checks:
			with self.subTest(check=check):
				with self.assertRaises(SystemExit):
					check.run()
	
	def test_correct_return_code(self):
		expected_results = {
			Result.UNKNOWN: [
				self.unknown_check,
				ExceptionInCheck,
				ExceptionInInit,
				ExitInCheck,
				ExitInInit,
				DefaultCheck,
				self.check_without_status,
				],
			Result.OK: [
				self.multiline_check,
				self.passing_check,
				],
			Result.WARNING: [
				self.warning_check,
				],
			Result.CRITICAL: [
				self.critical_check,
				],
			}

		for result, checks in expected_results.items():
			for check in checks:
				with self.subTest(check=check, expected_result=result):
					try:
						check.run()
					except SystemExit as e:
						self.assertEqual(e.code, result.value)
	
	def test_something_output(self):
		for check in self.all_checks:
			with self.subTest(check=check):
				with redirect_stdout(io.StringIO()) as output:
					try:
						check.run()
					except SystemExit:
						pass
				output = output.getvalue()
				assert len(output) > 0
				assert '\n' in output
	
	def test_correct_output(self):
		"""
		The multiline status must contain both messages verbatim.
		"""
		with redirect_stdout(io.StringIO()) as output:
			try:
				self.multiline_check.run()
			except SystemExit:
				pass
		output = output.getvalue()
		self.assertIn(self.short_message, output)
		self.assertIn(self.long_message, output)






if __name__ == '__main__':
	unittest.main()