from git import Repo, GitConfigParser
import logging
import os
from typing import Optional, List
from pathlib import Path

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

token: Optional[str] = None


def gen_gh_token_candidates() -> List[Path]:
	return [
		Path(os.getcwd()).joinpath(".gh-token"),
		Path(os.getenv("HOME")).joinpath(".config", "gh-token"),
		Path("/etc").joinpath("cloner-gh-token"),
	]


def init_gh_token():
	for candidate in gen_gh_token_candidates():
		log.debug(f"Loading gh-candidate candidate {candidate.as_posix()}")
		load_gh_token(candidate)
		if token:
			log.info(f"Token succesfully loaded")
			break


def load_gh_token(path: Path):
	global token
	log.info(f"Loading secret github token")
	if not path.is_file():
		log.warning(f"Token load did not pass - file not found")
		return
	# load token
	token = path.read_text().strip()


def config_try_override(config_writer: GitConfigParser, section: str, option: str, value: str):
	if section not in config_writer.sections():
		log.debug(f"CFG Creating section: {section}")
		config_writer.add_section(section)
	if not config_writer.has_option(section, option):
		log.debug(f"CFG Creating option: {option}")
		config_writer.add_value(section, option, "")

	log.debug(f"Setting {section}.{option} = {value}")
	config_writer.set(section, option, value)


def prepare_git_auth(repo: str, config_dir):
	log.debug(f"CFG: Opening repo {repo}")
	repo = Repo(repo)
	path: str = repo._get_config_path("user")
	log.debug(f"CFG config path: {path}")
	path = os.path.dirname(path)
	log.debug(f"CFG parent path: {path}")
	if not os.path.isdir(path):
		log.debug(f"CFG Creating config dir")
		os.mkdir(path)

	cred_store: str = os.path.join(path, "git-credentials")
	ssh_identity: str = os.path.join(config_dir, "ssh", "identity")

	with repo.config_writer("user") as cfgw:
		# github personal token
		# 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
		if token:
			config_try_override(
				cfgw,
				f"url \"https://{token}:x-oauth-basic@github.com/\"",
				"insteadOf",
				"https://github.com/"
			)

		# https credential store
		log.debug(f"Writing credential store setting")
		config_try_override(cfgw, "credential", "helper", f"store --file={cred_store}")
		# ssh key
		log.debug(f"Writing SSH cert path")
		config_try_override(
			cfgw,
			"core",
			"sshcommand",
			f"ssh -i {ssh_identity} -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -o BatchMode=yes -q"
		)