from functools import lru_cache

from archinstall.lib.exceptions import SysCallError
from archinstall.lib.menu.helpers import Loading, Notify, Selection
from archinstall.lib.models.packages import AvailablePackage, LocalPackage, PackageGroup, Repository
from archinstall.lib.output import debug
from archinstall.lib.pacman.pacman import Pacman
from archinstall.lib.translationhandler import tr
from archinstall.tui.ui.menu_item import MenuItem, MenuItemGroup
from archinstall.tui.ui.result import ResultType


def installed_package(package: str) -> LocalPackage | None:
	try:
		package_info = []
		for line in Pacman.run(f'-Q --info {package}'):
			package_info.append(line.decode().strip())

		return _parse_package_output(package_info, LocalPackage)
	except SysCallError:
		pass

	return None


@lru_cache
def check_package_upgrade(package: str) -> str | None:
	try:
		for line in Pacman.run(f'-Qu {package}'):
			return line.decode().strip()
	except SysCallError:
		debug(f'Failed to check for package upgrades: {package}')

	return None


@lru_cache
def package_group_info(package: str) -> PackageGroup | None:
	try:
		package_info: list[str] = []
		for line in Pacman.run(f'-Sg {package}'):
			package_info.append(line.decode().strip())
		group = PackageGroup.from_package_group_output(package_info)
		return group
	except SysCallError:
		debug(f'Failed to get package info: {package}')

	return None


@lru_cache
def available_package(package: str) -> AvailablePackage | None:
	try:
		package_info: list[str] = []
		for line in Pacman.run(f'-S --info {package}'):
			package_info.append(line.decode().strip())

		return _parse_package_output(package_info, AvailablePackage)
	except SysCallError:
		pass

	return None


@lru_cache
def list_available_packages(
	repositories: tuple[Repository, ...],
) -> dict[str, AvailablePackage]:
	"""
	Returns a list of all available packages in the database
	"""
	packages: dict[str, AvailablePackage] = {}
	current_package: list[str] = []
	filtered_repos = [repo.value for repo in repositories]

	try:
		Pacman.run('-Sy')
	except Exception as e:
		debug(f'Failed to sync Arch Linux package database: {e}')

	for line in Pacman.run('-S --info'):
		dec_line = line.decode().strip()
		current_package.append(dec_line)

		if dec_line.startswith('Validated'):
			if current_package:
				avail_pkg = _parse_package_output(current_package, AvailablePackage)
				if avail_pkg.repository in filtered_repos:
					packages[avail_pkg.name] = avail_pkg
				current_package = []

	return packages


@lru_cache(maxsize=128)
def _normalize_key_name(key: str) -> str:
	return key.strip().lower().replace(' ', '_')


def _parse_package_output[PackageType: (AvailablePackage, LocalPackage)](
	package_meta: list[str],
	cls: type[PackageType],
) -> PackageType:
	package = {}
	current_key = None

	for line in package_meta:
		if not line.strip():
			continue

		if ':' in line and not line.startswith('  '):
			key_raw, value = line.split(':', 1)
			current_key = _normalize_key_name(key_raw)
			package[current_key] = value.strip()
		elif current_key:
			package[current_key] += ' ' + line.strip()

	return cls.model_validate(package)


async def select_additional_packages(
	preset: list[str] = [],
	repositories: set[Repository] = set(),
) -> list[str]:
	repositories |= {Repository.Core, Repository.Extra}

	respos_text = ', '.join(r.value for r in repositories)
	output = tr('Repositories: {}').format(respos_text) + '\n'
	output += tr('Loading packages...')

	result = await Loading[dict[str, AvailablePackage]](
		header=output,
		data_callback=lambda: list_available_packages(tuple(repositories)),
	).show()

	if result.type_ != ResultType.Selection:
		debug('Error while loading packages')
		return preset

	packages = result.get_value()

	if not packages:
		await Notify(tr('No packages found')).show()
		return []

	package_groups = PackageGroup.from_available_packages(packages)

	# Additional packages (with some light weight error handling for invalid package names)
	header = tr('Only packages such as base, sudo, linux, linux-firmware, efibootmgr and optional profile packages are installed.') + '\n'
	header += tr('Note: base-devel is no longer installed by default. Add it here if you need build tools.') + '\n'
	header += tr('Select any packages from the below list that should be installed additionally') + '\n'

	# there are over 15k packages so this needs to be quick
	preset_packages: list[AvailablePackage | PackageGroup] = []
	for p in preset:
		if p in packages:
			preset_packages.append(packages[p])
		elif p in package_groups:
			preset_packages.append(package_groups[p])

	items = [
		MenuItem(
			name,
			value=pkg,
			preview_action=lambda x: x.value.info() if x.value else None,
		)
		for name, pkg in packages.items()
	]

	items += [
		MenuItem(
			name,
			value=group,
			preview_action=lambda x: x.value.info() if x.value else None,
		)
		for name, group in package_groups.items()
	]

	menu_group = MenuItemGroup(items, sort_items=True)
	menu_group.set_selected_by_value(preset_packages)

	pck_result = await Selection[AvailablePackage | PackageGroup](
		menu_group,
		header=header,
		allow_reset=True,
		allow_skip=True,
		multi=True,
		preview_location='right',
		enable_filter=True,
	).show()

	match pck_result.type_:
		case ResultType.Skip:
			return preset
		case ResultType.Reset:
			return []
		case ResultType.Selection:
			selected_pacakges = pck_result.get_values()
			return [pkg.name for pkg in selected_pacakges]
