from .disk import *
from .hardware import *
from .locale_helpers import verify_x11_keyboard_layout
from .mirrors import *
from .storage import storage
from .user_interaction import *

# Any package that the Installer() is responsible for (optional and the default ones)
__packages__ = ["base", "base-devel", "linux-firmware", "linux", "linux-lts", "linux-zen", "linux-hardened"]


class Installer:
	"""
	`Installer()` is the wrapper for most basic installation steps.
	It also wraps :py:func:`~archinstall.Installer.pacstrap` among other things.

	:param partition: Requires a partition as the first argument, this is
		so that the installer can mount to `mountpoint` and strap packages there.
	:type partition: class:`archinstall.Partition`

	:param boot_partition: There's two reasons for needing a boot partition argument,
		The first being so that `mkinitcpio` can place the `vmlinuz` kernel at the right place
		during the `pacstrap` or `linux` and the base packages for a minimal installation.
		The second being when :py:func:`~archinstall.Installer.add_bootloader` is called,
		A `boot_partition` must be known to the installer before this is called.
	:type boot_partition: class:`archinstall.Partition`

	:param profile: A profile to install, this is optional and can be called later manually.
		This just simplifies the process by not having to call :py:func:`~archinstall.Installer.install_profile` later on.
	:type profile: str, optional

	:param hostname: The given /etc/hostname for the machine.
	:type hostname: str, optional

	"""

	def __init__(self, target, *, base_packages=None, kernels=None):
		if base_packages is None:
			base_packages = __packages__[:3]
		if kernels is None:
			kernels = ['linux']
		self.target = target
		self.init_time = time.strftime('%Y-%m-%d_%H-%M-%S')
		self.milliseconds = int(str(time.time()).split('.')[1])

		self.helper_flags = {
			'base': False,
			'bootloader': False
		}

		self.base_packages = base_packages.split(' ') if type(base_packages) is str else base_packages
		for kernel in kernels:
			self.base_packages.append(kernel)

		self.post_base_install = []

		storage['session'] = self
		self.partitions = get_partitions_in_use(self.target)

		self.MODULES = []
		self.BINARIES = []
		self.FILES = []
		self.HOOKS = ["base", "udev", "autodetect", "keyboard", "keymap", "modconf", "block", "filesystems", "fsck"]
		self.KERNEL_PARAMS = []

	def log(self, *args, level=logging.DEBUG, **kwargs):
		"""
		installer.log() wraps output.log() mainly to set a default log-level for this install session.
		Any manual override can be done per log() call.
		"""
		log(*args, level=level, **kwargs)

	def __enter__(self, *args, **kwargs):
		return self

	def __exit__(self, *args, **kwargs):
		# b''.join(sys_command('sync')) # No need to, since the underlying fs() object will call sync.
		# TODO: https://stackoverflow.com/questions/28157929/how-to-safely-handle-an-exception-inside-a-context-manager

		if len(args) >= 2 and args[1]:
			self.log(args[1], level=logging.ERROR, fg='red')

			self.sync_log_to_install_medium()

			# We avoid printing /mnt/<log path> because that might confuse people if they note it down
			# and then reboot, and a identical log file will be found in the ISO medium anyway.
			print(f"[!] A log file has been created here: {os.path.join(storage['LOG_PATH'], storage['LOG_FILE'])}")
			print("    Please submit this issue (and file) to https://github.com/archlinux/archinstall/issues")
			raise args[1]

		self.genfstab()

		if not (missing_steps := self.post_install_check()):
			self.log('Installation completed without any errors. You may now reboot.', fg='green', level=logging.INFO)
			self.sync_log_to_install_medium()

			return True
		else:
			self.log('Some required steps were not successfully installed/configured before leaving the installer:', fg='red', level=logging.WARNING)
			for step in missing_steps:
				self.log(f' - {step}', fg='red', level=logging.WARNING)

			self.log(f"Detailed error logs can be found at: {storage['LOG_PATH']}", level=logging.WARNING)
			self.log("Submit this zip file as an issue to https://github.com/archlinux/archinstall/issues", level=logging.WARNING)

			self.sync_log_to_install_medium()
			return False

	def sync_log_to_install_medium(self):
		# Copy over the install log (if there is one) to the install medium if
		# at least the base has been strapped in, otherwise we won't have a filesystem/structure to copy to.
		if self.helper_flags.get('base-strapped', False) is True:
			if filename := storage.get('LOG_FILE', None):
				absolute_logfile = os.path.join(storage.get('LOG_PATH', './'), filename)

				if not os.path.isdir(f"{self.target}/{os.path.dirname(absolute_logfile)}"):
					os.makedirs(f"{self.target}/{os.path.dirname(absolute_logfile)}")

				shutil.copy2(absolute_logfile, f"{self.target}/{absolute_logfile}")

		return True

	def mount(self, partition, mountpoint, create_mountpoint=True):
		if create_mountpoint and not os.path.isdir(f'{self.target}{mountpoint}'):
			os.makedirs(f'{self.target}{mountpoint}')

		partition.mount(f'{self.target}{mountpoint}')

	def post_install_check(self, *args, **kwargs):
		return [step for step, flag in self.helper_flags.items() if flag is False]

	def pacstrap(self, *packages, **kwargs):
		if type(packages[0]) in (list, tuple):
			packages = packages[0]
		self.log(f'Installing packages: {packages}', level=logging.INFO)

		if (sync_mirrors := SysCommand('/usr/bin/pacman -Syy')).exit_code == 0:
			if (pacstrap := SysCommand(f'/usr/bin/pacstrap {self.target} {" ".join(packages)}', peak_output=True)).exit_code == 0:
				return True
			else:
				self.log(f'Could not strap in packages: {pacstrap.exit_code}', level=logging.INFO)
		else:
			self.log(f'Could not sync mirrors: {sync_mirrors.exit_code}', level=logging.INFO)

	def set_mirrors(self, mirrors):
		return use_mirrors(mirrors, destination=f'{self.target}/etc/pacman.d/mirrorlist')

	def genfstab(self, flags='-pU'):
		self.log(f"Updating {self.target}/etc/fstab", level=logging.INFO)

		with open(f"{self.target}/etc/fstab", 'a') as fstab_fh:
			fstab_fh.write(SysCommand(f'/usr/bin/genfstab {flags} {self.target}').decode())

		if not os.path.isfile(f'{self.target}/etc/fstab'):
			raise RequirementError(f'Could not generate fstab, strapping in packages most likely failed (disk out of space?)\n{fstab}')

		return True

	def set_hostname(self, hostname: str, *args, **kwargs):
		with open(f'{self.target}/etc/hostname', 'w') as fh:
			fh.write(hostname + '\n')

	def set_locale(self, locale, encoding='UTF-8', *args, **kwargs):
		if not len(locale):
			return True

		with open(f'{self.target}/etc/locale.gen', 'a') as fh:
			fh.write(f'{locale}.{encoding} {encoding}\n')
		with open(f'{self.target}/etc/locale.conf', 'w') as fh:
			fh.write(f'LANG={locale}.{encoding}\n')

		return True if SysCommand(f'/usr/bin/arch-chroot {self.target} locale-gen').exit_code == 0 else False

	def set_timezone(self, zone, *args, **kwargs):
		if not zone:
			return True
		if not len(zone):
			return True  # Redundant

		if (pathlib.Path("/usr") / "share" / "zoneinfo" / zone).exists():
			(pathlib.Path(self.target) / "etc" / "localtime").unlink(missing_ok=True)
			SysCommand(f'/usr/bin/arch-chroot {self.target} ln -s /usr/share/zoneinfo/{zone} /etc/localtime')
			return True
		else:
			self.log(
				f"Time zone {zone} does not exist, continuing with system default.",
				level=logging.WARNING,
				fg='red'
			)

	def activate_ntp(self):
		self.log('Installing and activating NTP.', level=logging.INFO)
		if self.pacstrap('ntp'):
			if self.enable_service('ntpd'):
				return True

	def enable_service(self, *services):
		for service in services:
			self.log(f'Enabling service {service}', level=logging.INFO)
			if (output := self.arch_chroot(f'systemctl enable {service}')).exit_code != 0:
				raise ServiceException(f"Unable to start service {service}: {output}")

	def run_command(self, cmd, *args, **kwargs):
		return SysCommand(f'/usr/bin/arch-chroot {self.target} {cmd}')

	def arch_chroot(self, cmd, *args, **kwargs):
		if 'runas' in kwargs:
			cmd = f"su - {kwargs['runas']} -c \"{cmd}\""

		return self.run_command(cmd)

	def drop_to_shell(self):
		subprocess.check_call(f"/usr/bin/arch-chroot {self.target}", shell=True)

	def configure_nic(self, nic, dhcp=True, ip=None, gateway=None, dns=None, *args, **kwargs):
		from .systemd import Networkd

		if dhcp:
			conf = Networkd(Match={"Name": nic}, Network={"DHCP": "yes"})
		else:
			assert ip

			network = {"Address": ip}
			if gateway:
				network["Gateway"] = gateway
			if dns:
				assert type(dns) == list
				network["DNS"] = dns

			conf = Networkd(Match={"Name": nic}, Network=network)

		with open(f"{self.target}/etc/systemd/network/10-{nic}.network", "a") as netconf:
			netconf.write(str(conf))

	def copy_iso_network_config(self, enable_services=False):
		# Copy (if any) iwd password and config files
		if os.path.isdir('/var/lib/iwd/'):
			if psk_files := glob.glob('/var/lib/iwd/*.psk'):
				if not os.path.isdir(f"{self.target}/var/lib/iwd"):
					os.makedirs(f"{self.target}/var/lib/iwd")

				if enable_services:
					# If we haven't installed the base yet (function called pre-maturely)
					if self.helper_flags.get('base', False) is False:
						self.base_packages.append('iwd')

						# This function will be called after minimal_installation()
						# as a hook for post-installs. This hook is only needed if
						# base is not installed yet.
						def post_install_enable_iwd_service(*args, **kwargs):
							self.enable_service('iwd')

						self.post_base_install.append(post_install_enable_iwd_service)
					# Otherwise, we can go ahead and add the required package
					# and enable it's service:
					else:
						self.pacstrap('iwd')
						self.enable_service('iwd')

				for psk in psk_files:
					shutil.copy2(psk, f"{self.target}/var/lib/iwd/{os.path.basename(psk)}")

		# Copy (if any) systemd-networkd config files
		if netconfigurations := glob.glob('/etc/systemd/network/*'):
			if not os.path.isdir(f"{self.target}/etc/systemd/network/"):
				os.makedirs(f"{self.target}/etc/systemd/network/")

			for netconf_file in netconfigurations:
				shutil.copy2(netconf_file, f"{self.target}/etc/systemd/network/{os.path.basename(netconf_file)}")

			if enable_services:
				# If we haven't installed the base yet (function called pre-maturely)
				if self.helper_flags.get('base', False) is False:

					def post_install_enable_networkd_resolved(*args, **kwargs):
						self.enable_service('systemd-networkd', 'systemd-resolved')

					self.post_base_install.append(post_install_enable_networkd_resolved)
				# Otherwise, we can go ahead and enable the services
				else:
					self.enable_service('systemd-networkd', 'systemd-resolved')

		return True

	def detect_encryption(self, partition):
		part = Partition(partition.parent, None, autodetect_filesystem=True)
		if partition.encrypted:
			return partition
		elif partition.parent not in partition.path and part.filesystem == 'crypto_LUKS':
			return part

		return False

	def mkinitcpio(self, *flags):
		with open(f'{self.target}/etc/mkinitcpio.conf', 'w') as mkinit:
			mkinit.write(f"MODULES=({' '.join(self.MODULES)})\n")
			mkinit.write(f"BINARIES=({' '.join(self.BINARIES)})\n")
			mkinit.write(f"FILES=({' '.join(self.FILES)})\n")
			mkinit.write(f"HOOKS=({' '.join(self.HOOKS)})\n")
		SysCommand(f'/usr/bin/arch-chroot {self.target} mkinitcpio {" ".join(flags)}')

	def minimal_installation(self):
		# Add necessary packages if encrypting the drive
		# (encrypted partitions default to btrfs for now, so we need btrfs-progs)
		# TODO: Perhaps this should be living in the function which dictates
		#       the partitioning. Leaving here for now.

		for partition in self.partitions:
			if partition.filesystem == 'btrfs':
				# if partition.encrypted:
				self.base_packages.append('btrfs-progs')
			if partition.filesystem == 'xfs':
				self.base_packages.append('xfsprogs')
			if partition.filesystem == 'f2fs':
				self.base_packages.append('f2fs-tools')

			# Configure mkinitcpio to handle some specific use cases.
			if partition.filesystem == 'btrfs':
				if 'btrfs' not in self.MODULES:
					self.MODULES.append('btrfs')
				if '/usr/bin/btrfs-progs' not in self.BINARIES:
					self.BINARIES.append('/usr/bin/btrfs')

			if self.detect_encryption(partition):
				if 'encrypt' not in self.HOOKS:
					self.HOOKS.insert(self.HOOKS.index('filesystems'), 'encrypt')

		if not has_uefi():
			self.base_packages.append('grub')

		if not is_vm():
			vendor = cpu_vendor()
			if vendor == "AuthenticAMD":
				self.base_packages.append("amd-ucode")
				if (ucode := pathlib.Path(f"{self.target}/boot/amd-ucode.img")).exists():
					ucode.unlink()
			elif vendor == "GenuineIntel":
				self.base_packages.append("intel-ucode")
				if (ucode := pathlib.Path(f"{self.target}/boot/intel-ucode.img")).exists():
					ucode.unlink()
			else:
				self.log(f"Unknown CPU vendor '{vendor}' detected. Archinstall won't install any ucode.", level=logging.DEBUG)

		self.pacstrap(self.base_packages)
		self.helper_flags['base-strapped'] = True

		with open(f"{self.target}/etc/fstab", "a") as fstab:
			fstab.write("\ntmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0\n")  # Redundant \n at the start? who knows?

		# TODO: Support locale and timezone
		# os.remove(f'{self.target}/etc/localtime')
		# sys_command(f'/usr/bin/arch-chroot {self.target} ln -s /usr/share/zoneinfo/{localtime} /etc/localtime')
		# sys_command('/usr/bin/arch-chroot /mnt hwclock --hctosys --localtime')
		self.set_hostname('archinstall')
		self.set_locale('en_US')

		# TODO: Use python functions for this
		SysCommand(f'/usr/bin/arch-chroot {self.target} chmod 700 /root')

		self.mkinitcpio('-P')

		self.helper_flags['base'] = True

		# Run registered post-install hooks
		for function in self.post_base_install:
			self.log(f"Running post-installation hook: {function}", level=logging.INFO)
			function(self)

		return True

	def add_bootloader(self, bootloader='systemd-bootctl'):
		boot_partition = None
		root_partition = None
		for partition in self.partitions:
			if partition.mountpoint == self.target + '/boot':
				boot_partition = partition
			elif partition.mountpoint == self.target:
				root_partition = partition

		self.log(f'Adding bootloader {bootloader} to {boot_partition if boot_partition else root_partition}', level=logging.INFO)

		if bootloader == 'systemd-bootctl':
			self.pacstrap('efibootmgr')

			if not has_uefi():
				raise HardwareIncompatibilityError
			# TODO: Ideally we would want to check if another config
			# points towards the same disk and/or partition.
			# And in which case we should do some clean up.

			# Install the boot loader
			if SysCommand(f'/usr/bin/arch-chroot {self.target} bootctl --path=/boot install').exit_code != 0:
				# Fallback, try creating the boot loader without touching the EFI variables
				SysCommand(f'/usr/bin/arch-chroot {self.target} bootctl --no-variables --path=/boot install')

			# Modify or create a loader.conf
			if os.path.isfile(f'{self.target}/boot/loader/loader.conf'):
				with open(f'{self.target}/boot/loader/loader.conf', 'r') as loader:
					loader_data = loader.read().split('\n')
			else:
				loader_data = [
					f"default {self.init_time}",
					"timeout 5"
				]

			with open(f'{self.target}/boot/loader/loader.conf', 'w') as loader:
				for line in loader_data:
					if line[:8] == 'default ':
						loader.write(f'default {self.init_time}\n')
					elif line[:8] == '#timeout' and 'timeout 5' not in loader_data:
						# We add in the default timeout to support dual-boot
						loader.write(f"{line[1:]}\n")
					else:
						loader.write(f"{line}\n")

			# For some reason, blkid and /dev/disk/by-uuid are not getting along well.
			# And blkid is wrong in terms of LUKS.
			# UUID = sys_command('blkid -s PARTUUID -o value {drive}{partition_2}'.format(**args)).decode('UTF-8').strip()
			# Setup the loader entry
			with open(f'{self.target}/boot/loader/entries/{self.init_time}.conf', 'w') as entry:
				entry.write('# Created by: archinstall\n')
				entry.write(f'# Created on: {self.init_time}\n')
				entry.write('title Arch Linux\n')
				entry.write('linux /vmlinuz-linux\n')
				if not is_vm():
					vendor = cpu_vendor()
					if vendor == "AuthenticAMD":
						entry.write("initrd /amd-ucode.img\n")
					elif vendor == "GenuineIntel":
						entry.write("initrd /intel-ucode.img\n")
					else:
						self.log("unknow cpu vendor, not adding ucode to systemd-boot config")
				entry.write('initrd /initramfs-linux.img\n')
				# blkid doesn't trigger on loopback devices really well,
				# so we'll use the old manual method until we get that sorted out.

				if real_device := self.detect_encryption(root_partition):
					# TODO: We need to detect if the encrypted device is a whole disk encryption,
					#       or simply a partition encryption. Right now we assume it's a partition (and we always have)
					log(f"Identifying root partition by PART-UUID on {real_device}: '{real_device.uuid}'.", level=logging.DEBUG)
					entry.write(f'options cryptdevice=PARTUUID={real_device.uuid}:luksdev root=/dev/mapper/luksdev rw intel_pstate=no_hwp {" ".join(self.KERNEL_PARAMS)}\n')
				else:
					log(f"Identifying root partition by PART-UUID on {root_partition}, looking for '{root_partition.uuid}'.", level=logging.DEBUG)
					entry.write(f'options root=PARTUUID={root_partition.uuid} rw intel_pstate=no_hwp {" ".join(self.KERNEL_PARAMS)}\n')

				self.helper_flags['bootloader'] = bootloader
				return True

		elif bootloader == "grub-install":
			self.pacstrap('grub')

			if has_uefi():
				self.pacstrap('efibootmgr')
				o = b''.join(SysCommand(f'/usr/bin/arch-chroot {self.target} grub-install --target=x86_64-efi --efi-directory=/boot --bootloader-id=GRUB'))
				SysCommand('/usr/bin/arch-chroot /mnt grub-mkconfig -o /boot/grub/grub.cfg')
				return True
			else:
				root_device = subprocess.check_output(f'basename "$(readlink -f /sys/class/block/{root_partition.path.replace("/dev/", "")}/..)"', shell=True).decode().strip()
				if root_device == "block":
					root_device = f"{root_partition.path}"
				o = b''.join(SysCommand(f'/usr/bin/arch-chroot {self.target} grub-install --target=i386-pc /dev/{root_device}'))
				SysCommand('/usr/bin/arch-chroot /mnt grub-mkconfig -o /boot/grub/grub.cfg')
				self.helper_flags['bootloader'] = bootloader
				return True
		else:
			raise RequirementError(f"Unknown (or not yet implemented) bootloader requested: {bootloader}")

	def add_additional_packages(self, *packages):
		return self.pacstrap(*packages)

	def install_profile(self, profile):
		storage['installation_session'] = self

		if type(profile) == str:
			profile = Profile(self, profile)

		self.log(f'Installing network profile {profile}', level=logging.INFO)
		return profile.install()

	def enable_sudo(self, entity: str, group=False):
		self.log(f'Enabling sudo permissions for {entity}.', level=logging.INFO)
		with open(f'{self.target}/etc/sudoers', 'a') as sudoers:
			sudoers.write(f'{"%" if group else ""}{entity} ALL=(ALL) ALL\n')
		return True

	def user_create(self, user: str, password=None, groups=None, sudo=False):
		if groups is None:
			groups = []
		self.log(f'Creating user {user}', level=logging.INFO)
		o = b''.join(SysCommand(f'/usr/bin/arch-chroot {self.target} useradd -m -G wheel {user}'))
		if password:
			self.user_set_pw(user, password)

		if groups:
			for group in groups:
				o = b''.join(SysCommand(f'/usr/bin/arch-chroot {self.target} gpasswd -a {user} {group}'))

		if sudo and self.enable_sudo(user):
			self.helper_flags['user'] = True

	def user_set_pw(self, user, password):
		self.log(f'Setting password for {user}', level=logging.INFO)

		if user == 'root':
			# This means the root account isn't locked/disabled with * in /etc/passwd
			self.helper_flags['user'] = True

		o = b''.join(SysCommand(f"/usr/bin/arch-chroot {self.target} sh -c \"echo '{user}:{password}' | chpasswd\""))
		pass

	def user_set_shell(self, user, shell):
		self.log(f'Setting shell for {user} to {shell}', level=logging.INFO)

		o = b''.join(SysCommand(f"/usr/bin/arch-chroot {self.target} sh -c \"chsh -s {shell} {user}\""))
		pass

	def set_keyboard_language(self, language: str) -> bool:
		if len(language.strip()):
			if not verify_keyboard_layout(language):
				self.log(f"Invalid keyboard language specified: {language}", fg="red", level=logging.ERROR)
				return False

			# In accordance with https://github.com/archlinux/archinstall/issues/107#issuecomment-841701968
			# Setting an empty keymap first, allows the subsequent call to set layout for both console and x11.
			from .systemd import Boot

			with Boot(self) as session:
				session.SysCommand(["localectl", "set-keymap", '""'])

				if (output := session.SysCommand(["localectl", "set-keymap", language])).exit_code != 0:
					raise ServiceException(f"Unable to set locale '{language}' for console: {output}")

				self.log(f"Keyboard language for this installation is now set to: {language}")
		else:
			self.log('Keyboard language was not changed from default (no language specified).', fg="yellow", level=logging.INFO)

		return True

	def set_x11_keyboard_language(self, language: str) -> bool:
		"""
		A fallback function to set x11 layout specifically and separately from console layout.
		This isn't strictly necessary since .set_keyboard_language() does this as well.
		"""
		if len(language.strip()):
			if not verify_x11_keyboard_layout(language):
				self.log(f"Invalid x11-keyboard language specified: {language}", fg="red", level=logging.ERROR)
				return False

			with Boot(self) as session:
				session.SysCommand(["localectl", "set-x11-keymap", '""'])

				if (output := session.SysCommand(["localectl", "set-x11-keymap", language])).exit_code != 0:
					raise ServiceException(f"Unable to set locale '{language}' for X11: {output}")
		else:
			self.log(f'X11-Keyboard language was not changed from default (no language specified).', fg="yellow", level=logging.INFO)

		return True