import json
import os
import re
import sys
import time
import unittest
import click
import frappe
import requests

from .test_runner import (SLOW_TEST_THRESHOLD, make_test_records, set_test_email_config)

click_ctx = click.get_current_context(True)
if click_ctx:
	click_ctx.color = True

class ParallelTestRunner():
	def __init__(self, app, site, build_number=1, total_builds=1):
		self.app = app
		self.site = site
		self.build_number = frappe.utils.cint(build_number) or 1
		self.total_builds = frappe.utils.cint(total_builds)
		self.setup_test_site()
		self.run_tests()

	def setup_test_site(self):
		frappe.init(site=self.site)
		if not frappe.db:
			frappe.connect()

		frappe.flags.in_test = True
		frappe.clear_cache()
		frappe.utils.scheduler.disable_scheduler()
		set_test_email_config()
		self.before_test_setup()

	def before_test_setup(self):
		start_time = time.time()
		for fn in frappe.get_hooks("before_tests", app_name=self.app):
			frappe.get_attr(fn)()

		test_module = frappe.get_module(f'{self.app}.tests')

		if hasattr(test_module, "global_test_dependencies"):
			for doctype in test_module.global_test_dependencies:
				make_test_records(doctype)

		elapsed = time.time() - start_time
		elapsed = click.style(f' ({elapsed:.03}s)', fg='red')
		click.echo(f'Before Test {elapsed}')

	def run_tests(self):
		self.test_result = ParallelTestResult(stream=sys.stderr, descriptions=True, verbosity=2)

		for test_file_info in self.get_test_file_list():
			self.run_tests_for_file(test_file_info)

		self.print_result()

	def run_tests_for_file(self, file_info):
		if not file_info: return

		frappe.set_user('Administrator')
		path, filename = file_info
		module = self.get_module(path, filename)
		self.create_test_dependency_records(module, path, filename)
		test_suite = unittest.TestSuite()
		module_test_cases = unittest.TestLoader().loadTestsFromModule(module)
		test_suite.addTest(module_test_cases)
		test_suite(self.test_result)

	def create_test_dependency_records(self, module, path, filename):
		if hasattr(module, "test_dependencies"):
			for doctype in module.test_dependencies:
				make_test_records(doctype)

		if os.path.basename(os.path.dirname(path)) == "doctype":
			# test_data_migration_connector.py > data_migration_connector.json
			test_record_filename = re.sub('^test_', '', filename).replace(".py", ".json")
			test_record_file_path = os.path.join(path, test_record_filename)
			if os.path.exists(test_record_file_path):
				with open(test_record_file_path, 'r') as f:
					doc = json.loads(f.read())
					doctype = doc["name"]
					make_test_records(doctype)

	def get_module(self, path, filename):
		app_path = frappe.get_pymodule_path(self.app)
		relative_path = os.path.relpath(path, app_path)
		if relative_path == '.':
			module_name = self.app
		else:
			relative_path = relative_path.replace('/', '.')
			module_name = os.path.splitext(filename)[0]
			module_name = f'{self.app}.{relative_path}.{module_name}'

		return frappe.get_module(module_name)

	def print_result(self):
		self.test_result.printErrors()
		click.echo(self.test_result)
		if self.test_result.failures or self.test_result.errors:
			if os.environ.get('CI'):
				sys.exit(1)

	def get_test_file_list(self):
		test_list = get_all_tests(self.app)
		split_size = frappe.utils.ceil(len(test_list) / self.total_builds)
		# [1,2,3,4,5,6] to [[1,2], [3,4], [4,6]] if split_size is 2
		test_chunks = [test_list[x:x+split_size] for x in range(0, len(test_list), split_size)]
		return test_chunks[self.build_number - 1]


class ParallelTestResult(unittest.TextTestResult):
	def startTest(self, test):
		self._started_at = time.time()
		super(unittest.TextTestResult, self).startTest(test)
		test_class = unittest.util.strclass(test.__class__)
		if not hasattr(self, 'current_test_class') or self.current_test_class != test_class:
			click.echo(f"\n{unittest.util.strclass(test.__class__)}")
			self.current_test_class = test_class

	def getTestMethodName(self, test):
		return test._testMethodName if hasattr(test, '_testMethodName') else str(test)

	def addSuccess(self, test):
		super(unittest.TextTestResult, self).addSuccess(test)
		elapsed = time.time() - self._started_at
		threshold_passed = elapsed >= SLOW_TEST_THRESHOLD
		elapsed = click.style(f' ({elapsed:.03}s)', fg='red') if threshold_passed else ''
		click.echo(f"  {click.style(' ✔ ', fg='green')} {self.getTestMethodName(test)}{elapsed}")

	def addError(self, test, err):
		super(unittest.TextTestResult, self).addError(test, err)
		click.echo(f"  {click.style(' ✖ ', fg='red')} {self.getTestMethodName(test)}")

	def addFailure(self, test, err):
		super(unittest.TextTestResult, self).addFailure(test, err)
		click.echo(f"  {click.style(' ✖ ', fg='red')} {self.getTestMethodName(test)}")

	def addSkip(self, test, reason):
		super(unittest.TextTestResult, self).addSkip(test, reason)
		click.echo(f"  {click.style(' = ', fg='white')} {self.getTestMethodName(test)}")

	def addExpectedFailure(self, test, err):
		super(unittest.TextTestResult, self).addExpectedFailure(test, err)
		click.echo(f"  {click.style(' ✖ ', fg='red')} {self.getTestMethodName(test)}")

	def addUnexpectedSuccess(self, test):
		super(unittest.TextTestResult, self).addUnexpectedSuccess(test)
		click.echo(f"  {click.style(' ✔ ', fg='green')} {self.getTestMethodName(test)}")

	def printErrors(self):
		click.echo('\n')
		self.printErrorList(' ERROR ', self.errors, 'red')
		self.printErrorList(' FAIL ', self.failures, 'red')

	def printErrorList(self, flavour, errors, color):
		for test, err in errors:
			click.echo(self.separator1)
			click.echo(f"{click.style(flavour, bg=color)} {self.getDescription(test)}")
			click.echo(self.separator2)
			click.echo(err)

	def __str__(self):
		return f"Tests: {self.testsRun}, Failing: {len(self.failures)}, Errors: {len(self.errors)}"

def get_all_tests(app):
	test_file_list = []
	for path, folders, files in os.walk(frappe.get_pymodule_path(app)):
		for dontwalk in ('locals', '.git', 'public', '__pycache__'):
			if dontwalk in folders:
				folders.remove(dontwalk)

		# for predictability
		folders.sort()
		files.sort()

		if os.path.sep.join(["doctype", "doctype", "boilerplate"]) in path:
			# in /doctype/doctype/boilerplate/
			continue

		for filename in files:
			if filename.startswith("test_") and filename.endswith(".py") \
				and filename != 'test_runner.py':
				test_file_list.append([path, filename])

	return test_file_list


class ParallelTestWithOrchestrator(ParallelTestRunner):
	'''
		This can be used to balance-out test time across multiple instances
		This is dependent on external orchestrator which returns next test to run

		orchestrator endpoints
		- register-instance (<build_id>, <instance_id>, test_spec_list)
		- get-next-test-spec (<build_id>, <instance_id>)
		- test-completed (<build_id>, <instance_id>)
	'''
	def __init__(self, app, site):
		self.orchestrator_url = os.environ.get('ORCHESTRATOR_URL')
		if not self.orchestrator_url:
			click.echo('ORCHESTRATOR_URL environment variable not found!')
			click.echo('Pass public URL after hosting https://github.com/frappe/test-orchestrator')
			sys.exit(1)

		self.ci_build_id = os.environ.get('CI_BUILD_ID')
		self.ci_instance_id = os.environ.get('CI_INSTANCE_ID') or frappe.generate_hash(length=10)
		if not self.ci_build_id:
			click.echo('CI_BUILD_ID environment variable not found!')
			sys.exit(1)

		ParallelTestRunner.__init__(self, app, site)

	def run_tests(self):
		self.test_status = 'ongoing'
		self.register_instance()
		super().run_tests()

	def get_test_file_list(self):
		while self.test_status == 'ongoing':
			yield self.get_next_test()

	def register_instance(self):
		test_spec_list = get_all_tests(self.app)
		response_data = self.call_orchestrator('register-instance', data={
			'test_spec_list': test_spec_list
		})
		self.is_master = response_data.get('is_master')

	def get_next_test(self):
		response_data = self.call_orchestrator('get-next-test-spec')
		self.test_status = response_data.get('status')
		return response_data.get('next_test')

	def print_result(self):
		self.call_orchestrator('test-completed')
		return super().print_result()

	def call_orchestrator(self, endpoint, data=None):
		if data is None:
			data = {}
		# add repo token header
		# build id in header
		headers = {
			'CI-BUILD-ID': self.ci_build_id,
			'CI-INSTANCE-ID': self.ci_instance_id,
			'REPO-TOKEN': '2948288382838DE'
		}
		url = f'{self.orchestrator_url}/{endpoint}'
		res = requests.get(url, json=data, headers=headers)
		res.raise_for_status()
		response_data = {}
		if 'application/json' in res.headers.get('content-type'):
			response_data = res.json()

		return response_data