import json
import readline
import stat
from pathlib import Path
from typing import TYPE_CHECKING

from archinstall.tui.curses_menu import SelectMenu, Tui
from archinstall.tui.menu_item import MenuItem, MenuItemGroup
from archinstall.tui.result import ResultType
from archinstall.tui.types import Alignment, FrameProperties, Orientation, PreviewStyle

from .args import ArchConfig
from .crypt import encrypt
from .general import JSON, UNSAFE_JSON
from .output import debug, warn
from .storage import storage
from .utils.util import get_password, prompt_dir

if TYPE_CHECKING:
	from collections.abc import Callable

	from archinstall.lib.translationhandler import DeferredTranslation

	_: Callable[[str], DeferredTranslation]


class ConfigurationOutput:
	def __init__(self, config: ArchConfig):
		"""
		Configuration output handler to parse the existing
		configuration data structure and prepare for output on the
		console and for saving it to configuration files

		:param config: Archinstall configuration object
		:type config: ArchConfig
		"""

		self._config = config
		self._default_save_path = storage.get('LOG_PATH', Path('.'))
		self._user_config_file = Path('user_configuration.json')
		self._user_creds_file = Path('user_credentials.json')

	@property
	def user_configuration_file(self) -> Path:
		return self._user_config_file

	@property
	def user_credentials_file(self) -> Path:
		return self._user_creds_file

	def user_config_to_json(self) -> str:
		out = self._config.safe_json()
		return json.dumps(out, indent=4, sort_keys=True, cls=JSON)

	def user_credentials_to_json(self) -> str:
		out = self._config.unsafe_json()
		return json.dumps(out, indent=4, sort_keys=True, cls=UNSAFE_JSON)

	def write_debug(self) -> None:
		debug(" -- Chosen configuration --")
		debug(self.user_config_to_json())

	def confirm_config(self) -> bool:
		header = f'{_("The specified configuration will be applied")}. '
		header += str(_('Would you like to continue?')) + '\n'

		with Tui():
			group = MenuItemGroup.yes_no()
			group.focus_item = MenuItem.yes()
			group.set_preview_for_all(lambda x: self.user_config_to_json())

			result = SelectMenu[bool](
				group,
				header=header,
				alignment=Alignment.CENTER,
				columns=2,
				orientation=Orientation.HORIZONTAL,
				allow_skip=False,
				preview_size='auto',
				preview_style=PreviewStyle.BOTTOM,
				preview_frame=FrameProperties.max(str(_('Configuration')))
			).run()

			if result.item() != MenuItem.yes():
				return False

		return True

	def _is_valid_path(self, dest_path: Path) -> bool:
		dest_path_ok = dest_path.exists() and dest_path.is_dir()
		if not dest_path_ok:
			warn(
				f'Destination directory {dest_path.resolve()} does not exist or is not a directory\n.',
				'Configuration files can not be saved'
			)
		return dest_path_ok

	def save_user_config(self, dest_path: Path) -> None:
		if self._is_valid_path(dest_path):
			target = dest_path / self._user_config_file
			target.write_text(self.user_config_to_json())
			target.chmod(stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP)

	def save_user_creds(
		self,
		dest_path: Path,
		password: str | None = None
	) -> None:
		data = self.user_credentials_to_json()

		if password:
			data = encrypt(password, data)

		if self._is_valid_path(dest_path):
			target = dest_path / self._user_creds_file
			target.write_text(data)
			target.chmod(stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP)

	def save(
		self,
		dest_path: Path | None = None,
		creds: bool = False,
		password: str | None = None
	) -> None:
		save_path = dest_path or self._default_save_path

		if self._is_valid_path(save_path):
			self.save_user_config(save_path)
			if creds:
				self.save_user_creds(save_path, password=password)


def save_config(config: ArchConfig) -> None:
	def preview(item: MenuItem) -> str | None:
		match item.value:
			case "user_config":
				serialized = config_output.user_config_to_json()
				return f"{config_output.user_configuration_file}\n{serialized}"
			case "user_creds":
				if maybe_serial := config_output.user_credentials_to_json():
					return f"{config_output.user_credentials_file}\n{maybe_serial}"
				return str(_("No configuration"))
			case "all":
				output = [str(config_output.user_configuration_file)]
				config_output.user_credentials_to_json()
				output.append(str(config_output.user_credentials_file))
				return '\n'.join(output)
		return None

	config_output = ConfigurationOutput(config)

	items = [
		MenuItem(
			str(_("Save user configuration (including disk layout)")),
			value="user_config",
			preview_action=preview
		),
		MenuItem(
			str(_("Save user credentials")),
			value="user_creds",
			preview_action=preview
		),
		MenuItem(
			str(_("Save all")),
			value="all",
			preview_action=preview
		)
	]

	group = MenuItemGroup(items)
	result = SelectMenu[str](
		group,
		allow_skip=True,
		preview_frame=FrameProperties.max(str(_('Configuration'))),
		preview_size='auto',
		preview_style=PreviewStyle.RIGHT
	).run()

	match result.type_:
		case ResultType.Skip:
			return
		case ResultType.Selection:
			save_option = result.get_value()
		case _:
			raise ValueError('Unhandled return type')

	readline.set_completer_delims("\t\n=")
	readline.parse_and_bind("tab: complete")

	dest_path = prompt_dir(
		str(_('Directory')),
		str(_('Enter a directory for the configuration(s) to be saved (tab completion enabled)')) + '\n',
		allow_skip=True
	)

	if not dest_path:
		return

	header = str(_("Do you want to save the configuration file(s) to {}?")).format(dest_path)

	group = MenuItemGroup.yes_no()
	group.focus_item = MenuItem.yes()

	result = SelectMenu(
		group,
		header=header,
		allow_skip=False,
		alignment=Alignment.CENTER,
		columns=2,
		orientation=Orientation.HORIZONTAL
	).run()

	match result.type_:
		case ResultType.Selection:
			if result.item() == MenuItem.no():
				return

	debug(f"Saving configuration files to {dest_path.absolute()}")

	header = str(_('Do you want to encrypt the user_credentials.json file?'))

	group = MenuItemGroup.yes_no()
	group.focus_item = MenuItem.no()

	result = SelectMenu(
		group,
		header=header,
		allow_skip=False,
		alignment=Alignment.CENTER,
		columns=2,
		orientation=Orientation.HORIZONTAL
	).run()

	enc_password: str | None = None
	match result.type_:
		case ResultType.Selection:
			if result.item() == MenuItem.yes():
				password = get_password(
					text=str(_('Credentials file encryption password')),
					allow_skip=True
				)

				if password:
					enc_password = password.plaintext

	match save_option:
		case "user_config":
			config_output.save_user_config(dest_path)
		case "user_creds":
			config_output.save_user_creds(dest_path, password=enc_password)
		case "all":
			config_output.save(dest_path, creds=True, password=enc_password)
