import giteapy
import logging
import sys


class Migrator:
	
	__DEFAULT_API_PATH = "/api/v1"
	__REPO_ORIGINAL_NAME_TOKEN = "%N%"
	
	def __init__(
		self,
		source_host, source_port, source_token,
		destination_host, destination_port, destination_token,
	):
		
		# noinspection PyTypeChecker
		self.__logger: logging.Logger = None
		self._init_logger()
		
		self.__verify_ssl = True
		
		self.__source_host = source_host
		self.__source_port = source_port
		self.__source_token = source_token
		
		self.__destination_host = destination_host
		self.__destination_port = destination_port
		self.__destination_token = destination_token
	
	def _init_logger(self):
		
		logger = logging.Logger(name=f"{type(self).__name__}", level=logging.INFO)
		
		stdout_handler = logging.StreamHandler(stream=sys.stdout)
		logger.addHandler(stdout_handler)
		
		self.__logger = logger
	
	def _get_user_api(self, hostname, port, token) -> giteapy.UserApi:
		
		conf = giteapy.Configuration()
		conf.api_key['access_token'] = token
		conf.host = self._make_api_base(hostname=hostname, port=port)
		conf.verify_ssl = self.__verify_ssl
		api = giteapy.UserApi(giteapy.ApiClient(conf))
		
		return api
		
	def _get_repo_api(self, hostname, port, token) -> giteapy.RepositoryApi:
		
		conf = giteapy.Configuration()
		conf.api_key['access_token'] = token
		conf.host = self._make_api_base(hostname=hostname, port=port)
		conf.verify_ssl = self.__verify_ssl
		api = giteapy.RepositoryApi(giteapy.ApiClient(conf))
		
		return api
	
	def _get_org_apis(self) -> (giteapy.OrganizationApi, giteapy.OrganizationApi):
		
		api_source = self._get_org_api(
			hostname=self.__source_host, port=self.__source_port,
			token=self.__source_token
		)
		api_destination = self._get_org_api(
			hostname=self.__destination_host, port=self.__destination_port,
			token=self.__destination_token
		)
		
		return api_source, api_destination
	
	def _get_org_api(self, hostname, port, token) -> giteapy.OrganizationApi:
		
		conf = giteapy.Configuration()
		conf.api_key['access_token'] = token
		conf.host = self._make_api_base(hostname=hostname, port=port)
		conf.verify_ssl = self.__verify_ssl
		api = giteapy.OrganizationApi(giteapy.ApiClient(conf))
		
		return api
	
	def _make_api_base(self, hostname, port):
		
		base = f"https://{hostname}"
		if port is not None:
			base += f":{port}"
		base += self.__DEFAULT_API_PATH
		
		return base
	
	def _make_destination_repo_name(self, pattern: str, repo: giteapy.Repository):
		
		repo_name = pattern.replace(self.__REPO_ORIGINAL_NAME_TOKEN, repo.name)
		
		return repo_name
	
	def set_verify_ssl(self, b: bool):
		
		self.__verify_ssl = b
	
	def migrate_entire_org(
		self,
		interactive: bool = True,
		source_org: str = None, source_topics: list[str] = None,
		destination_org: str = None, destination_repo_name: str = None, destination_topics: list = None
	):
		assert source_org is not None, "Source org must be specified"
		assert destination_org is not None, "Destination org must be specified"
		assert destination_repo_name is not None, "Destination repo name must be specified"
		assert destination_topics is not None, "Destination topics must be specified"
		
		api_source, api_destination = self._get_org_apis()
		api_source: giteapy.OrganizationApi
		api_destination: giteapy.OrganizationApi
		
		# Grab all org repos
		source_repos = self._fetch_all_org_repos(org=source_org)
		self.__logger.info(f"Found {len(source_repos)} repos on source:")
		for repo in source_repos:
			repo: giteapy.Repository
			self.__logger.info(f"- #{repo.id} {repo.full_name}")
		
		print()
		
		# Filter
		source_repos = self._filter_repos_for_required_topics(repos=source_repos, topics=source_topics)
		
		repos_migrate = []
		repos_ignore = []
		go_right_now = False
		for repo in source_repos:
			
			repo: giteapy.Repository
			
			while True:
				
				if interactive:
					response = input(f"Migrate repo #{repo.id} \"{repo.full_name}\" ? (Y)es, (N)o, (G)o right now, (Q)uit ==> ")
					response = response.lower()
				else:
					response = "y"
				
				valid_input = True
				if response == "y":
					repos_migrate.append(repo)
				elif response == "n":
					repos_ignore.append(repo)
				elif response == "g":
					self.__logger.info("Okay, done asking questions, migrating existing selections.")
					go_right_now = True
				elif response == "q":
					go_right_now = True
					repos_migrate.clear()
					repos_ignore.clear()
					self.__logger.info("Okay, quitting instead.")
				else:
					valid_input = False
					self.__logger.warning(f"Invalid input: {response}")
				
				if valid_input:
					break
			
			if go_right_now:
				break
		
		#
		self.__logger.info("")
		if len(repos_migrate):
			self.__logger.info("Repos to migrate:")
			for repo in repos_migrate:
				repo: giteapy.Repository
				destination_name = self._make_destination_repo_name(pattern=destination_repo_name, repo=repo)
				self.__logger.info(f"#{repo.id} \"{repo.name}\" ==> \"{destination_name}\"")
		else:
			self.__logger.info("No repos marked to migrate")
		
		self.__logger.info("")
		if len(repos_ignore):
			self.__logger.info("Repos to ignore:")
			for repo in repos_ignore:
				repo: giteapy.Repository
				self.__logger.info(f"#{repo.id} \"{repo.name}\"")
		else:
			self.__logger.info("No repos marked to ignore")
		
		if len(repos_migrate):
			
			confirmation = input("Do you confirm the above selections? Enter MIGRATE ==> ")
			
			if confirmation == "MIGRATE":
				
				self.__logger.info("Confirmation received; Processing ... ")
				source_repos_successful = self._migrate_repos(
					destination_org_name=destination_org,
					destination_repo_name=destination_repo_name,
					destination_topics=destination_topics,
					repos=repos_migrate
				)
				self.__logger.info(f"{len(source_repos_successful)} of {len(repos_migrate)} repos successfully migrated.")
				
				self._delete_migrated_repos(source_org_name=source_org, repos=source_repos_successful)
				
			else:
				self.__logger.info("Confirmation not received; Won't do anything.")
	
	def _fetch_all_org_repos(self, org: str):
		
		api_source, api_destination = self._get_org_apis()
		api_source: giteapy.OrganizationApi
		
		source_repos = []
		
		page = 0
		while True:
			
			page += 1  # Starts at 1 for some reason
			source_repos_page = api_source.org_list_repos(org, page=page, limit=25)
			
			if len(source_repos_page) == 0:
				break
			
			source_repos.extend(source_repos_page)
		
		return source_repos
	
	def _filter_repos_for_required_topics(self, repos: list[giteapy.Repository], topics: list[str]) -> list[giteapy.Repository]:
		
		self.__logger.info(f"Filtering source repos for required topics: {topics}")
		
		repos_keep = []
		repos_reject = []
		repo_topics = {}
		
		api_source_repos = self._get_repo_api(
			hostname=self.__source_host, port=self.__source_port,
			token=self.__source_token
		)
		
		for repo in repos:
			
			repo_topics[repo.id] = api_source_repos.repo_list_topics(owner=repo.owner.login, repo=repo.name)
			repo_topics[repo.id] = repo_topics[repo.id].topics
			
			self.__logger.error(f"Repo topics: {repo_topics[repo.id]}")
			
			if self._check_required_topics(topics_present=repo_topics[repo.id], topics_required=topics):
				repos_keep.append(repo)
			else:
				repos_reject.append(repo)
		
		self.__logger.info(f"Keeping the following repos because they contain all required topics ({topics}):")
		if len(repos_keep) > 0:
			for repo in repos_keep:
				self.__logger.info(f"> {repo.full_name}")
		else:
			self.__logger.info("> None")
		
		self.__logger.info("Rejecting the following repos because they don't contain all required topics:")
		if len(repos_reject) > 0:
			for repo in repos_reject:
				self.__logger.info(f"> {repo.full_name} ({repo_topics[repo.id]})")
		else:
			self.__logger.info("> None")
		
		return repos_keep
	
	def _check_required_topics(self, topics_present: list[str], topics_required: list[str]) -> bool:
		
		for topic in topics_required:
			if topic not in topics_present:
				return False
		
		return True
	
	def _migrate_repos(
			self,
			destination_org_name: str,
			destination_repo_name: str,
			destination_topics: list,
			repos: list
	):
		
		api_source, api_destination = self._get_org_apis()
		
		destination_org = api_destination.org_get(org=destination_org_name)
		destination_org: giteapy.Organization
		
		self.__logger.info(f"Destination organization: {destination_org.full_name}")
		
		source_repos_successful = []
		for source_repo in repos:
			
			source_repo: giteapy.Repository
			
			this_destination_repo_name = destination_repo_name.replace("%N%", source_repo.name)
			
			migrate_body = giteapy.MigrateRepoForm(
				mirror=False,
				clone_addr=source_repo.clone_url,
				uid=destination_org.id,
				private=source_repo.private,
				repo_name=this_destination_repo_name,
				description=source_repo.description,
				labels=True, issues=True, pull_requests=True, releases=True, milestones=True, wiki=True
			)
			# TODO: These three lines represent feature request to giteapy authors
			migrate_body.auth_token = self.__source_token
			migrate_body.swagger_types["auth_token"] = "str"
			migrate_body.attribute_map["auth_token"] = "auth_token"
			
			self.__logger.debug("Migrate body:")
			self.__logger.debug(migrate_body)
			
			destination_api = self._get_repo_api(
				hostname=self.__destination_host,
				port=self.__destination_port,
				token=self.__destination_token,
			)
			repo_new = destination_api.repo_migrate(body=migrate_body)
			self.__logger.debug(f"Migration result: {repo_new}")
			repo_new: giteapy.Repository
			
			assert repo_new.name == this_destination_repo_name,\
				"New repository didn't end up with the correct name. Failure?"
			
			for topic in destination_topics:
				self.__logger.debug(f"Appending topic to new repo: {topic}")
				destination_api.repo_add_topc(
					owner=destination_org.username,
					repo=repo_new.name,
					topic=topic,
				)
			
			source_repos_successful.append(source_repo)
		
		return source_repos_successful
	
	def _delete_migrated_repos(self, source_org_name: str, repos: list[giteapy.Repository]):
		
		repo_api = self._get_repo_api(
			hostname=self.__source_host,
			port=self.__source_port,
			token=self.__source_token
		)
		repo_api: giteapy.RepositoryApi
		
		self.__logger.info("")
		self.__logger.info("Can now delete the following successfully migrated repos:")
		for r in repos:
			self.__logger.info(f"> #{r.id} \"{r.full_name}\" ==> {r.clone_url}")
		
		response = input("Would you like to delete the successfully migrated repos? Type DELETE ==> ")
		
		if response != "DELETE":
			self.__logger.info("Okay, won't delete migrated repos.")
			return
		
		do_quit = False
		do_delete_all = False
		for repo in repos:
			
			self.__logger.info(f"Next repo to delete: #{repo.id} \"{repo.full_name}\"")
			do_delete = True if do_delete_all else False
			
			if do_delete is False:
				
				response = input("Delete this repo? (Y)es, (N), (A)ll, (Q)uit ==> ")
				response = response.lower()
				
				valid_response = False
				
				while valid_response is False:
					
					valid_response = True
					if response == "y":
						self.__logger.info(f"Okay, deleting {repo.name} from source")
						do_delete = True
					elif response == "n":
						self.__logger.info(f"Okay, won't delete {repo.name}")
					elif response == "a":
						self.__logger.info(f"Okay, deleting ALL remaining repos")
						do_delete_all = True
					elif response == "q":
						do_quit = True
					else:
						valid_response = False
						self.__logger.warning(f"Invalid response: {response}")
			
			if do_quit:
				break
			
			if do_delete or do_delete_all:
				
				self.__logger.info(f"Deleting repo: {repo.full_name}")
				
				repo_api.repo_delete(
					owner=source_org_name,
					repo=repo.name
				)