#!/usr/bin/env python3

# Interactive shell for working with SIM / UICC / USIM / ISIM cards
#
# (C) 2021 by Harald Welte <laforge@osmocom.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

from typing import List

import json

import cmd2
from cmd2 import style, fg, bg
from cmd2 import CommandSet, with_default_category, with_argparser
import argparse

import os
import sys
from pathlib import Path

from pySim.ts_51_011 import EF, DF, EF_SST_map
from pySim.ts_31_102 import EF_UST_map, EF_USIM_ADF_map
from pySim.ts_31_103 import EF_IST_map, EF_ISIM_ADF_map

from pySim.exceptions import *
from pySim.commands import SimCardCommands
from pySim.transport import init_reader, ApduTracer, argparse_add_reader_args
from pySim.cards import card_detect, Card
from pySim.utils import h2b, swap_nibbles, rpad, h2s, JsonEncoder
from pySim.utils import dec_st, sanitize_pin_adm, tabulate_str_list, is_hex, boxed_heading_str
from pySim.card_handler import card_handler

from pySim.filesystem import CardMF, RuntimeState, CardDF, CardADF
from pySim.ts_51_011 import CardProfileSIM, DF_TELECOM, DF_GSM
from pySim.ts_102_221 import CardProfileUICC
from pySim.ts_31_102 import CardApplicationUSIM
from pySim.ts_31_103 import CardApplicationISIM

from pySim.card_key_provider import CardKeyProviderCsv, card_key_provider_register, card_key_provider_get_field


class PysimApp(cmd2.Cmd):
	CUSTOM_CATEGORY = 'pySim Commands'
	def __init__(self, card, rs, script = None):
		basic_commands = [Iso7816Commands(), PySimCommands()]
		super().__init__(persistent_history_file='~/.pysim_shell_history', allow_cli_args=False,
				 use_ipython=True, auto_load_commands=False, command_sets=basic_commands, startup_script=script)
		self.intro = style('Welcome to pySim-shell!', fg=fg.red)
		self.default_category = 'pySim-shell built-in commands'
		self.card = card
		iccid, sw = self.card.read_iccid()
		self.iccid = iccid
		self.rs = rs
		self.py_locals = { 'card': self.card, 'rs' : self.rs }
		self.numeric_path = False
		self.add_settable(cmd2.Settable('numeric_path', bool, 'Print File IDs instead of names',
						  onchange_cb=self._onchange_numeric_path))
		self.conserve_write = True
		self.add_settable(cmd2.Settable('conserve_write', bool, 'Read and compare before write',
						  onchange_cb=self._onchange_conserve_write))
		self.update_prompt()
		self.json_pretty_print = True
		self.add_settable(cmd2.Settable('json_pretty_print', bool, 'Pretty-Print JSON output'))
		self.apdu_trace = False
		self.add_settable(cmd2.Settable('apdu_trace', bool, 'Trace and display APDUs exchanged with card',
						  onchange_cb=self._onchange_apdu_trace))

	def poutput_json(self, data, force_no_pretty = False):
		"""like cmd2.poutput() but for a JSON serializable dict."""
		if force_no_pretty or self.json_pretty_print == False:
			output = json.dumps(data, cls=JsonEncoder)
		else:
			output = json.dumps(data, cls=JsonEncoder, indent=4)
		self.poutput(output)

	def _onchange_numeric_path(self, param_name, old, new):
		self.update_prompt()

	def _onchange_conserve_write(self, param_name, old, new):
		self.rs.conserve_write = new

	def _onchange_apdu_trace(self, param_name, old, new):
		if new == True:
			self.card._scc._tp.apdu_tracer = self.Cmd2ApduTracer(self)
		else:
			self.card._scc._tp.apdu_tracer = None

	class Cmd2ApduTracer(ApduTracer):
		def __init__(self, cmd2_app):
			self.cmd2 = app

		def trace_response(self, cmd, sw, resp):
			self.cmd2.poutput("-> %s %s" % (cmd[:10], cmd[10:]))
			self.cmd2.poutput("<- %s: %s" % (sw, resp))

	def update_prompt(self):
		path_list = self.rs.selected_file.fully_qualified_path(not self.numeric_path)
		self.prompt = 'pySIM-shell (%s)> ' % ('/'.join(path_list))

	@cmd2.with_category(CUSTOM_CATEGORY)
	def do_intro(self, _):
		"""Display the intro banner"""
		self.poutput(self.intro)

	@cmd2.with_category(CUSTOM_CATEGORY)
	def do_verify_adm(self, arg):
		"""VERIFY the ADM1 PIN"""
		if arg:
			# use specified ADM-PIN
			pin_adm = sanitize_pin_adm(arg)
		else:
			# try to find an ADM-PIN if none is specified
			result = card_key_provider_get_field('ADM1', key='ICCID', value=self.iccid)
			pin_adm = sanitize_pin_adm(result)
			if pin_adm:
				self.poutput("found ADM-PIN '%s' for ICCID '%s'" % (result, self.iccid))
			else:
				self.poutput("cannot find ADM-PIN for ICCID '%s'" % (self.iccid))
				return

		if pin_adm:
			self.card.verify_adm(h2b(pin_adm))
		else:
			self.poutput("error: cannot authenticate, no adm-pin!")

	@cmd2.with_category(CUSTOM_CATEGORY)
	def do_desc(self, opts):
		"""Display human readable file description for the currently selected file"""
		desc = self.rs.selected_file.desc
		if desc:
			self.poutput(desc)
		else:
			self.poutput("no description available")

@with_default_category('pySim Commands')
class PySimCommands(CommandSet):
	def __init__(self):
		super().__init__()

	dir_parser = argparse.ArgumentParser()
	dir_parser.add_argument('--fids', help='Show file identifiers', action='store_true')
	dir_parser.add_argument('--names', help='Show file names', action='store_true')
	dir_parser.add_argument('--apps', help='Show applications', action='store_true')
	dir_parser.add_argument('--all', help='Show all selectable identifiers and names', action='store_true')

	@cmd2.with_argparser(dir_parser)
	def do_dir(self, opts):
		"""Show a listing of files available in currently selected DF or MF"""
		if opts.all:
			flags = []
		elif opts.fids or opts.names or opts.apps:
			flags = ['PARENT', 'SELF']
			if opts.fids:
				flags += ['FIDS', 'AIDS']
			if opts.names:
				flags += ['FNAMES', 'ANAMES']
			if opts.apps:
				flags += ['ANAMES', 'AIDS']
		else:
			flags = ['PARENT', 'SELF', 'FNAMES', 'ANAMES']
		selectables = list(self._cmd.rs.selected_file.get_selectable_names(flags = flags))
		directory_str = tabulate_str_list(selectables, width = 79, hspace = 2, lspace = 1, align_left = True)
		path_list = self._cmd.rs.selected_file.fully_qualified_path(True)
		self._cmd.poutput('/'.join(path_list))
		path_list = self._cmd.rs.selected_file.fully_qualified_path(False)
		self._cmd.poutput('/'.join(path_list))
		self._cmd.poutput(directory_str)
		self._cmd.poutput("%d files" % len(selectables))

	def walk(self, indent = 0, action = None, context = None):
		"""Recursively walk through the file system, starting at the currently selected DF"""
		files = self._cmd.rs.selected_file.get_selectables(flags = ['FNAMES', 'ANAMES'])
		for f in files:
			if not action:
				output_str = "  " * indent + str(f) + (" " * 250)
				output_str = output_str[0:25]
				if isinstance(files[f], CardADF):
					output_str += " " + str(files[f].aid)
				else:
					output_str += " " + str(files[f].fid)
				output_str += " " + str(files[f].desc)
				self._cmd.poutput(output_str)

			if isinstance(files[f], CardDF):
				skip_df=False
				try:
					fcp_dec = self._cmd.rs.select(f, self._cmd)
				except Exception as e:
					skip_df=True
					df = self._cmd.rs.selected_file
					df_path_list = df.fully_qualified_path(True)
					df_skip_reason_str = '/'.join(df_path_list) + "/" + str(f) + ", " + str(e)
					if context:
						context['DF_SKIP'] += 1
						context['DF_SKIP_REASON'].append(df_skip_reason_str)

				# If the DF was skipped, we never have entered the directory
				# below, so we must not move up.
				if skip_df == False:
					self.walk(indent + 1, action, context)
					fcp_dec = self._cmd.rs.select("..", self._cmd)

			elif action:
				df_before_action = self._cmd.rs.selected_file
				action(f, context)
				# When walking through the file system tree the action must not
				# always restore the currently selected file to the file that
				# was selected before executing the action() callback.
				if df_before_action != self._cmd.rs.selected_file:
					raise RuntimeError("inconsistent walk, %s is currently selected but expecting %s to be selected"
							   % (str(self._cmd.rs.selected_file), str(df_before_action)))

	def do_tree(self, opts):
		"""Display a filesystem-tree with all selectable files"""
		self.walk()

	def export(self, filename, context):
		""" Select and export a single file """
		context['COUNT'] += 1
		df = self._cmd.rs.selected_file

		if not isinstance(df, CardDF):
			raise RuntimeError("currently selected file %s is not a DF or ADF" % str(df))

		df_path_list = df.fully_qualified_path(True)
		df_path_list_fid = df.fully_qualified_path(False)

		file_str = '/'.join(df_path_list) + "/" + str(filename)
		self._cmd.poutput(boxed_heading_str(file_str))

		self._cmd.poutput("# directory: %s (%s)" % ('/'.join(df_path_list), '/'.join(df_path_list_fid)))
		try:
			fcp_dec = self._cmd.rs.select(filename, self._cmd)
			self._cmd.poutput("# file: %s (%s)" % (self._cmd.rs.selected_file.name, self._cmd.rs.selected_file.fid))

			fd = fcp_dec['file_descriptor']
			structure = fd['structure']
			self._cmd.poutput("# structure: %s" % str(structure))

			for f in df_path_list:
				self._cmd.poutput("select " + str(f))
			self._cmd.poutput("select " + self._cmd.rs.selected_file.name)

			if structure == 'transparent':
				result = self._cmd.rs.read_binary()
				self._cmd.poutput("update_binary " + str(result[0]))
			if structure == 'cyclic' or structure == 'linear_fixed':
				num_of_rec = fd['num_of_rec']
				for r in range(1, num_of_rec + 1):
					result = self._cmd.rs.read_record(r)
					self._cmd.poutput("update_record %d %s" % (r, str(result[0])))
		except Exception as e:
			bad_file_str = '/'.join(df_path_list) + "/" + str(filename) + ", " + str(e)
			self._cmd.poutput("# bad file: %s" % bad_file_str)
			context['ERR'] += 1
			context['BAD'].append(bad_file_str)

		# When reading the file is done, make sure the parent file is
		# selected again. This will be the usual case, however we need
		# to check before since we must not select the same DF twice
		if df != self._cmd.rs.selected_file:
			self._cmd.rs.select(df.fid or df.aid, self._cmd)

		self._cmd.poutput("#")

	export_parser = argparse.ArgumentParser()
	export_parser.add_argument('--filename', type=str, default=None, help='only export specific file')

	@cmd2.with_argparser(export_parser)
	def do_export(self, opts):
		"""Export files to script that can be imported back later"""
		context = {'ERR':0, 'COUNT':0, 'BAD':[], 'DF_SKIP':0, 'DF_SKIP_REASON':[]}
		if opts.filename:
			self.export(opts.filename, context)
		else:
			self.walk(0, self.export, context)

		self._cmd.poutput(boxed_heading_str("Export summary"))

		self._cmd.poutput("# total files visited: %u" % context['COUNT'])
		self._cmd.poutput("# bad files:           %u" % context['ERR'])
		for b in context['BAD']:
			self._cmd.poutput("#  " + b)

		self._cmd.poutput("# skipped dedicated files(s): %u" % context['DF_SKIP'])
		for b in context['DF_SKIP_REASON']:
			self._cmd.poutput("#  " + b)

		if context['ERR'] and context['DF_SKIP']:
			raise RuntimeError("unable to export %i elementary file(s) and %i dedicated file(s)" % (context['ERR'], context['DF_SKIP']))
		elif context['ERR']:
			raise RuntimeError("unable to export %i elementary file(s)" % context['ERR'])
		elif context['DF_SKIP']:
			raise RuntimeError("unable to export %i dedicated files(s)" % context['ERR'])


@with_default_category('ISO7816 Commands')
class Iso7816Commands(CommandSet):
	def __init__(self):
		super().__init__()

	def do_select(self, opts):
		"""SELECT a File (ADF/DF/EF)"""
		if len(opts.arg_list) == 0:
			path_list = self._cmd.rs.selected_file.fully_qualified_path(True)
			path_list_fid = self._cmd.rs.selected_file.fully_qualified_path(False)
			self._cmd.poutput("currently selected file: " + '/'.join(path_list) + " (" + '/'.join(path_list_fid) + ")")
			return

		path = opts.arg_list[0]
		fcp_dec = self._cmd.rs.select(path, self._cmd)
		self._cmd.update_prompt()
		self._cmd.poutput_json(fcp_dec)

	def complete_select(self, text, line, begidx, endidx) -> List[str]:
		"""Command Line tab completion for SELECT"""
		index_dict = { 1: self._cmd.rs.selected_file.get_selectable_names() }
		return self._cmd.index_based_complete(text, line, begidx, endidx, index_dict=index_dict)

	def get_code(self, code):
		"""Use code either directly or try to get it from external data source"""
		auto = ('PIN1', 'PIN2', 'PUK1', 'PUK2')

		if str(code).upper() not in auto:
			return sanitize_pin_adm(code)

		result = card_key_provider_get_field(str(code), key='ICCID', value=self._cmd.iccid)
		result = sanitize_pin_adm(result)
		if result:
			self._cmd.poutput("found %s '%s' for ICCID '%s'" % (code.upper(), result, self._cmd.iccid))
		else:
			self._cmd.poutput("cannot find %s for ICCID '%s'" % (code.upper(), self._cmd.iccid))
		return result

	verify_chv_parser = argparse.ArgumentParser()
	verify_chv_parser.add_argument('--pin-nr', type=int, default=1, help='PIN Number, 1=PIN1, 2=PIN2 or custom value (decimal)')
	verify_chv_parser.add_argument('pin_code', type=str, help='PIN code digits, \"PIN1\" or \"PIN2\" to get PIN code from external data source')

	@cmd2.with_argparser(verify_chv_parser)
	def do_verify_chv(self, opts):
		"""Verify (authenticate) using specified PIN code"""
		pin = self.get_code(opts.pin_code)
		(data, sw) = self._cmd.card._scc.verify_chv(opts.pin_nr, h2b(pin))
		self._cmd.poutput("CHV verification successful")

	unblock_chv_parser = argparse.ArgumentParser()
	unblock_chv_parser.add_argument('--pin-nr', type=int, default=1, help='PUK Number, 1=PIN1, 2=PIN2 or custom value (decimal)')
	unblock_chv_parser.add_argument('puk_code', type=str, help='PUK code digits \"PUK1\" or \"PUK2\" to get PUK code from external data source')
	unblock_chv_parser.add_argument('new_pin_code', type=str, help='PIN code digits \"PIN1\" or \"PIN2\" to get PIN code from external data source')

	@cmd2.with_argparser(unblock_chv_parser)
	def do_unblock_chv(self, opts):
		"""Unblock PIN code using specified PUK code"""
		new_pin = self.get_code(opts.new_pin_code)
		puk = self.get_code(opts.puk_code)
		(data, sw) = self._cmd.card._scc.unblock_chv(opts.pin_nr, h2b(puk), h2b(new_pin))
		self._cmd.poutput("CHV unblock successful")

	change_chv_parser = argparse.ArgumentParser()
	change_chv_parser.add_argument('--pin-nr', type=int, default=1, help='PUK Number, 1=PIN1, 2=PIN2 or custom value (decimal)')
	change_chv_parser.add_argument('pin_code', type=str, help='PIN code digits \"PIN1\" or \"PIN2\" to get PIN code from external data source')
	change_chv_parser.add_argument('new_pin_code', type=str, help='PIN code digits \"PIN1\" or \"PIN2\" to get PIN code from external data source')

	@cmd2.with_argparser(change_chv_parser)
	def do_change_chv(self, opts):
		"""Change PIN code to a new PIN code"""
		new_pin = self.get_code(opts.new_pin_code)
		pin = self.get_code(opts.pin_code)
		(data, sw) = self._cmd.card._scc.change_chv(opts.pin_nr, h2b(pin), h2b(new_pin))
		self._cmd.poutput("CHV change successful")

	disable_chv_parser = argparse.ArgumentParser()
	disable_chv_parser.add_argument('--pin-nr', type=int, default=1, help='PIN Number, 1=PIN1, 2=PIN2 or custom value (decimal)')
	disable_chv_parser.add_argument('pin_code', type=str, help='PIN code digits, \"PIN1\" or \"PIN2\" to get PIN code from external data source')

	@cmd2.with_argparser(disable_chv_parser)
	def do_disable_chv(self, opts):
		"""Disable PIN code using specified PIN code"""
		pin = self.get_code(opts.pin_code)
		(data, sw) = self._cmd.card._scc.disable_chv(opts.pin_nr, h2b(pin))
		self._cmd.poutput("CHV disable successful")

	enable_chv_parser = argparse.ArgumentParser()
	enable_chv_parser.add_argument('--pin-nr', type=int, default=1, help='PIN Number, 1=PIN1, 2=PIN2 or custom value (decimal)')
	enable_chv_parser.add_argument('pin_code', type=str, help='PIN code digits, \"PIN1\" or \"PIN2\" to get PIN code from external data source')

	@cmd2.with_argparser(enable_chv_parser)
	def do_enable_chv(self, opts):
		"""Enable PIN code using specified PIN code"""
		pin = self.get_code(opts.pin_code)
		(data, sw) = self._cmd.card._scc.enable_chv(opts.pin_nr, h2b(pin))
		self._cmd.poutput("CHV enable successful")

	def do_deactivate_file(self, opts):
		"""Deactivate the current EF"""
		fid = self._cmd.rs.selected_file.fid
		(data, sw) = self._cmd.card._scc.deactivate_file(fid)

	def do_activate_file(self, opts):
		"""Activate the current EF"""
		fid = self._cmd.rs.selected_file.fid
		(data, sw) = self._cmd.card._scc.activate_file(fid)

	open_chan_parser = argparse.ArgumentParser()
	open_chan_parser.add_argument('chan_nr', type=int, default=0, help='Channel Number')

	@cmd2.with_argparser(open_chan_parser)
	def do_open_channel(self, opts):
		"""Open a logical channel."""
		(data, sw) = self._cmd.card._scc.manage_channel(mode='open', lchan_nr=opts.chan_nr)

	close_chan_parser = argparse.ArgumentParser()
	close_chan_parser.add_argument('chan_nr', type=int, default=0, help='Channel Number')

	@cmd2.with_argparser(close_chan_parser)
	def do_close_channel(self, opts):
		"""Close a logical channel."""
		(data, sw) = self._cmd.card._scc.manage_channel(mode='close', lchan_nr=opts.chan_nr)


option_parser = argparse.ArgumentParser(prog='pySim-shell', description='interactive SIM card shell',
                                        formatter_class=argparse.ArgumentDefaultsHelpFormatter)
argparse_add_reader_args(option_parser)

global_group = option_parser.add_argument_group('General Options')
global_group.add_argument('--script', metavar='PATH', default=None,
                          help='script with pySim-shell commands to be executed automatically at start-up')
global_group.add_argument('--csv', metavar='FILE', default=None, help='Read card data from CSV file')

adm_group = global_group.add_mutually_exclusive_group()
adm_group.add_argument('-a', '--pin-adm', metavar='PIN_ADM1', dest='pin_adm', default=None,
                       help='ADM PIN used for provisioning (overwrites default)')
adm_group.add_argument('-A', '--pin-adm-hex', metavar='PIN_ADM1_HEX', dest='pin_adm_hex', default=None,
                       help='ADM PIN used for provisioning, as hex string (16 characters long)')


if __name__ == '__main__':

	# Parse options
	opts = option_parser.parse_args()

	# Init card reader driver
	sl = init_reader(opts)
	if (sl == None):
		exit(1)

	# Create command layer
	scc = SimCardCommands(transport=sl)

	sl.wait_for_card();

	card_handler = card_handler(sl)

	card = card_detect("auto", scc)
	if card is None:
		print("No card detected!")
		sys.exit(2)

	profile = CardProfileUICC()
	profile.add_application(CardApplicationUSIM)
	profile.add_application(CardApplicationISIM)

	rs = RuntimeState(card, profile)
	# inform the transport that we can do context-specific SW interpretation
	sl.set_sw_interpreter(rs)

	# FIXME: do this dynamically
	rs.mf.add_file(DF_TELECOM())
	rs.mf.add_file(DF_GSM())

	# If a script file is specified, be sure that it actually exists
	if opts.script:
		if not os.access(opts.script, os.R_OK):
			print("Invalid script file!")
			sys.exit(2)

	app = PysimApp(card, rs, opts.script)
	rs.select('MF', app)

	# Register csv-file as card data provider, either from specified CSV
	# or from CSV file in home directory
	csv_default = str(Path.home()) + "/.osmocom/pysim/card_data.csv"
	if opts.csv:
		card_key_provider_register(CardKeyProviderCsv(opts.csv))
	if os.path.isfile(csv_default):
		card_key_provider_register(CardKeyProviderCsv(csv_default))

	# If the user supplies an ADM PIN at via commandline args authenticate
	# immediately so that the user does not have to use the shell commands
	pin_adm = sanitize_pin_adm(opts.pin_adm, opts.pin_adm_hex)
	if pin_adm:
		try:
			card.verify_adm(h2b(pin_adm))
		except Exception as e:
			print(e)

	app.cmdloop()