from repo_cloner.lib.cloner_config import ClonerConfig
from repo_cloner.lib.repo_dir_structure import RepoDirStructure
from repo_cloner.lib.dir_not_found_error import DirNotFoundError
from repo_cloner.lib.repo_tool import RepoTool
from repo_cloner.lib.checksum import gen_repo_hashed_name
from pathlib import Path
from typing import Optional
from time import time
import os
import logging

log = logging.getLogger("rc.cloner")


class Cloner:
	_dirs: RepoDirStructure = None
	_config: ClonerConfig = None
	_interval_file: str = "last-check-time"
	__submodule_cache: str = None
	_repo: RepoTool = None
	_repo_url: str = ""

	def __init__(self, dir_structure: RepoDirStructure):
		self._dirs = dir_structure
		self._config = self._dirs.config
		if len(self._config.cloner_repo_url) == 0:
			logging.critical(f"Undefined repo cloner URL in config!")
			raise KeyError(f"cloner_repo_url not defined in config!")

		# create cache dir, if missing
		try:
			assert self._dirs.cache_dir_exists
		except DirNotFoundError:
			log.info(f"Cache dir for project {self._config.cloner_project_name} not found -> creating")
			Path(self._dirs.cache_dir).mkdir()
			log.debug(f"Cache dir created")
		# submodule cache
		self.__submodule_cache = os.path.join(self._dirs.cache_dir, "submodules")
		if not os.path.exists(self.__submodule_cache):
			log.info("Submodule cache dir does not exist! -> creating")
			Path(self.__submodule_cache).mkdir(parents = True)


	def check_interval(self):
		log.debug(f"Checking interval for {self._config.cloner_project_name}")
		# get interval
		interval = self._config.cloner_interval
		# interval file?
		interval_file: Path = Path(self._dirs.cache_dir).joinpath(self._interval_file)
		log.debug(f"Interval file: {interval_file}")
		file_stamp: int = 0
		if interval_file.exists():
			str_val = interval_file.read_text()
			try:
				file_stamp = int(str_val)
			except ValueError:
				log.warning(f"Interval file file is corrupted, keeping value as nothing happened")
		# check time
		if time() > file_stamp + interval * 60:
			return True
		return False

	def open(self, url: str) -> bool:
		log.debug(f"Opening repo with url: {url}")
		repo_path = self._repo_path_by_url(url)
		self._repo_url = url
		self._repo = RepoTool(repo_path)
		return self.__opened

	@property
	def __opened(self) -> bool:
		if not self._repo:
			return False
		return self._repo.initialized

	def _repo_path_by_url(self, url: str) -> str:
		hashed_name: str = gen_repo_hashed_name(url)
		log.debug(f"Repo hashed name for {url} is {hashed_name}")
		return os.path.join(self._dirs.repos_dir, hashed_name)

	@property
	def __main_repo_path(self) -> str:
		return self._repo_path_by_url(self._config.cloner_repo_url)

	def sync(self) -> bool:
		if not self.__opened:
			self._repo = RepoTool(self.__main_repo_path)
			if not self._repo.initialized:
				return False
		return self._repo.fetch()

	def perform_check(self):
		log.info(f"Started check for {self._config.cloner_project_name}, url: {self._config.cloner_repo_url}")
		if self.check_interval():
			self.sync()
		log.info(f"Check finished")

	def clone(self, url: Optional[str] = None) -> bool:
		# optional parameters - othervise use config
		if not url:
			url = self._config.cloner_repo_url
		# generate path
		path = self._repo_path_by_url(url)
		self._repo_url = url
		self._repo = RepoTool(path)
		# uninitialized repo
		if self._repo.initialized:
			log.critical(f"Repo path {path} is initialized... Refusing clone!")
			return False

		# recursive or standard?
		if not self._config.cloner_submodules:
			return self._repo.clone(url)
		else:
			scan_depth_limit = self._config.cloner_submodule_depth
			# handle dept limit for submodule discovery
			if scan_depth_limit == 0:
				scan_depth_limit = None
			# another levels are handled internally as non-recursive clones and discovers by repo-tool
			return self._repo.clone_recursive(url, self.__submodule_cache, scan_depth = scan_depth_limit)