import getpass, time, json, sys, signal, os
import archinstall

"""
This signal-handler chain (and global variable)
is used to trigger the "Are you sure you want to abort?" question further down.
It might look a bit odd, but have a look at the line: "if SIG_TRIGGER:"
"""
SIG_TRIGGER = False
def kill_handler(sig, frame):
	print()
	exit(0)

def sig_handler(sig, frame):
	global SIG_TRIGGER
	SIG_TRIGGER = True
	signal.signal(signal.SIGINT, kill_handler)

original_sigint_handler = signal.getsignal(signal.SIGINT)
signal.signal(signal.SIGINT, sig_handler)


def perform_installation(device, boot_partition, language, mirrors):
	"""
	Performs the installation steps on a block device.
	Only requirement is that the block devices are
	formatted and setup prior to entering this function.
	"""
	with archinstall.Installer(device, boot_partition=boot_partition, hostname=archinstall.arguments.get('hostname', 'Archinstall')) as installation:
		## if len(mirrors):
		# Certain services might be running that affects the system during installation.
		# Currently, only one such service is "reflector.service" which updates /etc/pacman.d/mirrorlist
		# We need to wait for it before we continue since we opted in to use a custom mirror/region.
		installation.log(f'Waiting for automatic mirror selection has completed before using custom mirrors.')
		while 'dead' not in (status := archinstall.service_state('reflector')):
			time.sleep(1)

		archinstall.use_mirrors(mirrors) # Set the mirrors for the live medium
		if installation.minimal_installation():
			installation.set_mirrors(mirrors) # Set the mirrors in the installation medium
			installation.set_keyboard_language(language)
			installation.add_bootloader()

			# If user selected to copy the current ISO network configuration
			# Perform a copy of the config
			if archinstall.storage['_guided']['network'] == 'Copy ISO network configuration to installation':
				installation.copy_ISO_network_config(enable_services=True) # Sources the ISO network configuration to the install medium.

			# Otherwise, if a interface was selected, configure that interface
			elif archinstall.storage['_guided']['network']:
				installation.configure_nic(**archinstall.storage['_guided']['network'])
				installation.enable_service('systemd-networkd')
				installation.enable_service('systemd-resolved')


			if archinstall.storage['_guided']['packages'] and archinstall.storage['_guided']['packages'][0] != '':
				installation.add_additional_packages(archinstall.storage['_guided']['packages'])

			if 'profile' in archinstall.storage['_guided'] and len(profile := archinstall.storage['_guided']['profile']['path'].strip()):
				installation.install_profile(profile)

			if archinstall.storage['_guided']['users']:
				for user in archinstall.storage['_guided']['users']:
					password = users[user]

					sudo = False
					if 'root_pw' not in archinstall.storage['_guided_hidden'] or len(archinstall.storage['_guided_hidden']['root_pw'].strip()) == 0:
						sudo = True

					installation.user_create(user, password, sudo=sudo)

			if 'root_pw' in archinstall.storage['_guided_hidden'] and archinstall.storage['_guided_hidden']['root_pw']:
				installation.user_set_pw('root', archinstall.storage['_guided_hidden']['root_pw'])

"""
  First, we'll ask the user for a bunch of user input.
  Not until we're satisfied with what we want to install
  will we continue with the actual installation steps.
"""
if not archinstall.arguments.get('keyboard-language', None):
	archinstall.arguments['keyboard-language'] = archinstall.select_language(archinstall.list_keyboard_languages()).strip()

# Before continuing, set the preferred keyboard layout/language in the current terminal.
# This will just help the user with the next following questions.
if len(archinstall.arguments['keyboard-language']):
	archinstall.set_keyboard_language(archinstall.arguments['keyboard-language'])

# Set which region to download packages from during the installation
if not archinstall.arguments.get('mirror-region', None):
	archinstall.arguments['mirror-region'] = archinstall.select_mirror_regions(archinstall.list_mirrors())

# Ask which harddrive/block-device we will install to
if archinstall.arguments.get('harddrive', None):
	archinstall.arguments['harddrive'] = archinstall.BlockDevice(archinstall.arguments['harddrive'])
else:
	archinstall.arguments['harddrive'] = archinstall.select_disk(archinstall.all_disks())

# Perform a quick sanity check on the selected harddrive.
# 1. Check if it has partitions
# 3. Check that we support the current partitions
# 2. If so, ask if we should keep them or wipe everything
if archinstall.arguments['harddrive'].has_partitions():
	archinstall.log(f"{archinstall.arguments['harddrive']} contains the following partitions:", fg='red')

	# We curate a list pf supported paritions
	# and print those that we don't support.
	partition_mountpoints = {}
	for partition in archinstall.arguments['harddrive']:
		try:
			if partition.filesystem_supported():
				archinstall.log(f" {partition}")
				partition_mountpoints[partition] = None
		except archinstall.UnknownFilesystemFormat as err:
			archinstall.log(f" {partition} (Filesystem not supported)", fg='red')

	# We then ask what to do with the paritions.
	if (option := archinstall.ask_for_disk_layout()) == 'abort':
		archinstall.log(f"Safely aborting the installation. No changes to the disk or system has been made.")
		exit(1)
	elif option == 'keep-existing':
		archinstall.arguments['harddrive'].keep_partitions = True

		archinstall.log(f" ** You will now select which partitions to use by selecting mount points (inside the installation). **")
		archinstall.log(f" ** The root would be a simple / and the boot partition /boot (as all paths are relative inside the installation). **")
		while True:
			# Select a partition
			partition = archinstall.generic_select(partition_mountpoints.keys(),
													"Select a partition by number that you want to set a mount-point for (leave blank when done): ")
			if not partition:
				break

			# Select a mount-point
			mountpoint = input(f"Enter a mount-point for {partition}: ").strip(' ')
			if len(mountpoint):

				# Get a valid & supported filesystem for the parition:
				while 1:
					new_filesystem = input(f"Enter a valid filesystem for {partition} (leave blank for {partition.filesystem}): ").strip(' ')
					if len(new_filesystem) <= 0:
						break

					# Since the potentially new filesystem is new
					# we have to check if we support it. We can do this by formatting /dev/null with the partitions filesystem.
					# There's a nice wrapper for this on the partition object itself that supports a path-override during .format()
					try:
						partition.format(new_filesystem, path='/dev/null', log_formating=False, allow_formatting=True)
					except archinstall.UnknownFilesystemFormat:
						archinstall.log(f"Selected filesystem is not supported yet. If you want archinstall to support '{new_filesystem}', please create a issue-ticket suggesting it on github at https://github.com/Torxed/archinstall/issues.")
						archinstall.log(f"Until then, please enter another supported filesystem.")
						continue
					except archinstall.SysCallError:
						pass # Expected exception since mkfs.<format> can not format /dev/null.
							 # But that means our .format() function supported it.
					break

				# When we've selected all three criterias,
				# We can safely mark the partition for formatting and where to mount it.
				# TODO: allow_formatting might be redundant since target_mountpoint should only be
				#       set if we actually want to format it anyway.
				partition.allow_formatting = True
				partition.target_mountpoint = mountpoint
				# Only overwrite the filesystem definition if we selected one:
				if len(new_filesystem):
					partition.filesystem = new_filesystem

		archinstall.log('Using existing partition table reported above.')
	elif option == 'format-all':
		archinstall.arguments['filesystem'] = archinstall.ask_for_main_filesystem_format()
		archinstall.arguments['harddrive'].keep_partitions = False

# Get disk encryption password (or skip if blank)
if not archinstall.arguments.get('!encryption-password', None):
	archinstall.arguments['!encryption-password'] = archinstall.get_password(prompt='Enter disk encryption password (leave blank for no encryption): ')
archinstall.arguments['harddrive'].encryption_password = archinstall.arguments['!encryption-password']

# Get the hostname for the machine
if not archinstall.arguments.get('hostname', None):
	archinstall.arguments['hostname'] = input('Desired hostname for the installation: ').strip(' ')

# Ask for a root password (optional, but triggers requirement for super-user if skipped)
if not archinstall.arguments.get('!root-password', None):
	archinstall.arguments['!root-password'] = archinstall.get_password(prompt='Enter root password (Recommended: leave blank to leave root disabled): ')

#	# Storing things in _guided_hidden helps us avoid printing it
#	# when echoing user configuration: archinstall.storage['_guided']
#	archinstall.storage['_guided_hidden']['root_pw'] = root_pw
#	archinstall.storage['_guided']['root_unlocked'] = True
#	break

# Ask for additional users (super-user if root pw was not set)
archinstall.arguments['users'] = {}
archinstall.arguments['superusers'] = {}
if not archinstall.arguments.get('!root-password', None):
	archinstall.arguments['superusers'] = archinstall.ask_for_superuser_account('Create a required super-user with sudo privileges: ', forced=True)

users, superusers = archinstall.ask_for_additional_users('Any additional users to install (leave blank for no users): ')
archinstall.arguments['users'] = users
archinstall.arguments['superusers'] = {**archinstall.arguments['superusers'], **superusers}

# Ask for archinstall-specific profiles (such as desktop environments etc)
if not archinstall.arguments.get('profile', None):
	archinstall.arguments['profile'] = archinstall.select_profile(archinstall.list_profiles())
else:
	archinstall.arguments['profile'] = archinstall.list_profiles()[archinstall.arguments['profile']]

# Check the potentially selected profiles preperations to get early checks if some additional questions are needed.
if archinstall.arguments['profile'] and archinstall.arguments['profile'].has_prep_function():
	with archinstall.arguments['profile'].load_instructions(namespace=f"{archinstall.arguments['profile'].namespace}.py") as imported:
		if not imported._prep_function():
			archinstall.log(
				' * Profile\'s preparation requirements was not fulfilled.',
				bg='black',
				fg='red'
			)
			exit(1)

# Additional packages (with some light weight error handling for invalid package names)
if not archinstall.arguments.get('packages', None):
	archinstall.arguments['packages'] = [package for package in input('Additional packages aside from base (space separated): ').split(' ') if len(package)]

# Verify packages that were given
try:
	archinstall.validate_package_list(archinstall.arguments['packages'])
except archinstall.RequirementError as e:
	archinstall.log(e, fg='red')
	exit(1)

# Ask or Call the helper function that asks the user to optionally configure a network.
if not archinstall.arguments.get('nic', None):
	archinstall.arguments['nic'] = archinstall.ask_to_configure_network()

print()
print('This is your chosen configuration:')
archinstall.log("-- Guided template chosen (with below config) --", level=archinstall.LOG_LEVELS.Debug)
archinstall.log(json.dumps(archinstall.arguments, indent=4, sort_keys=True, cls=archinstall.JSON), level=archinstall.LOG_LEVELS.Info)
print()

input('Press Enter to continue.')

"""
	Issue a final warning before we continue with something un-revertable.
	We mention the drive one last time, and count from 5 to 0.
"""

print(f" ! Formatting {archinstall.arguments['harddrive']} in ", end='')

for i in range(5, 0, -1):
	print(f"{i}", end='')

	for x in range(4):
		sys.stdout.flush()
		time.sleep(0.25)
		print(".", end='')

	if SIG_TRIGGER:
		abort = input('\nDo you really want to abort (y/n)? ')
		if abort.strip() != 'n':
			exit(0)

		if SIG_TRIGGER is False:
			sys.stdin.read()
		SIG_TRIGGER = False
		signal.signal(signal.SIGINT, sig_handler)

# Put back the default/original signal handler now that we're done catching
# and interrupting SIGINT with "Do you really want to abort".
print()
signal.signal(signal.SIGINT, original_sigint_handler)

"""
	Setup the blockdevice, filesystem (and optionally encryption).
	Once that's done, we'll hand over to perform_installation()
"""
with archinstall.Filesystem(archinstall.arguments['harddrive'], archinstall.GPT) as fs:
	# Wipe the entire drive if the disk flag `keep_partitions`is False.
	if archinstall.arguments['harddrive'].keep_partitions is False:
		fs.use_entire_disk(root_filesystem_type=archinstall.arguments.get('filesystem', 'btrfs'),
							encrypt_root_partition=archinstall.arguments.get('!encryption-password', False))
	# Otherwise, check if encryption is desired and mark the root partition as encrypted.
	elif archinstall.arguments.get('!encryption-password', None):
		root_partition = fs.find_partition('/')
		root_partition.encrypted = True
			
	# After the disk is ready, iterate the partitions and check
	# which ones are safe to format, and format those.
	for partition in archinstall.arguments['harddrive']:
		if partition.safe_to_format():
			if partition.encrypted:
				partition.encrypt(password=archinstall.arguments.get('!encryption-password', None))
			else:
				partition.format()
		else:
			archinstall.log(f"Did not format {partition} because .safe_to_format() returned False or .allow_formatting was False.", level=archinstall.LOG_LEVELS.Debug)

	if archinstall.arguments.get('!encryption-password', None):
		# First encrypt and unlock, then format the desired partition inside the encrypted part.
		# archinstall.luks2() encrypts the partition when entering the with context manager, and
		# unlocks the drive so that it can be used as a normal block-device within archinstall.
		with archinstall.luks2(fs.find_partition('/'), 'luksloop', archinstall.arguments.get('!encryption-password', None)) as unlocked_device:
			unlocked_device.format(fs.find_partition('/').filesystem)

			perform_installation(device=unlocked_device,
									boot_partition=fs.find_partition('/boot'),
									language=archinstall.arguments['keyboard-language'],
									mirrors=archinstall.arguments['mirror-region'])
	else:
		archinstall.arguments['harddrive'].partition[1].format('ext4')
		perform_installation(device=fs.find_partition('/'),
								boot_partition=fs.find_partition('/boot'),
								language=archinstall.arguments['keyboard-language'],
								mirrors=archinstall.arguments['mirror-region'])