#!/usr/bin/env python
# License: GPLv3 Copyright: 2021, Kovid Goyal <kovid at kovidgoyal.net>


import os
import shlex
import shutil
import tempfile

from kittens.ssh.main import bootstrap_script, get_connection_data
from kitty.constants import is_macos
from kitty.fast_data_types import CURSOR_BEAM
from kitty.utils import SSHConnectionData

from . import BaseTest
from .shell_integration import bash_ok, basic_shell_env


class SSHTest(BaseTest):

    def test_basic_pty_operations(self):
        pty = self.create_pty('echo hello')
        pty.process_input_from_child()
        self.ae(pty.screen_contents(), 'hello')
        pty = self.create_pty(self.cmd_to_run_python_code('''\
import array, fcntl, sys, termios
buf = array.array('H', [0, 0, 0, 0])
fcntl.ioctl(sys.stdout, termios.TIOCGWINSZ, buf)
print(' '.join(map(str, buf)))'''), lines=13, cols=77)
        pty.process_input_from_child()
        self.ae(pty.screen_contents(), '13 77 770 260')

    def test_ssh_connection_data(self):
        def t(cmdline, binary='ssh', host='main', port=None, identity_file=''):
            if identity_file:
                identity_file = os.path.abspath(identity_file)
            q = get_connection_data(cmdline.split())
            self.ae(q, SSHConnectionData(binary, host, port, identity_file))

        t('ssh main')
        t('ssh un@ip -i ident -p34', host='un@ip', port=34, identity_file='ident')
        t('ssh un@ip -iident -p34', host='un@ip', port=34, identity_file='ident')
        t('ssh -p 33 main', port=33)

    def test_ssh_bootstrap_script(self):
        # test simple untar with only sh
        with tempfile.TemporaryDirectory() as tdir:
            self.check_bootstrap('sh', tdir, 'sh', SHELL_INTEGRATION_VALUE='')
        # test various detection methods for login_shell
        methods = []
        if shutil.which('python') or shutil.which('python3') or shutil.which('python2'):
            methods.append('using_python')
        if is_macos:
            methods += ['using_id']
        else:
            if shutil.which('getent'):
                methods.append('using_getent')
            if os.access('/etc/passwd', os.R_OK):
                methods.append('using_passwd')
        self.assertTrue(methods)
        import pwd
        expected_login_shell = pwd.getpwuid(os.geteuid()).pw_shell
        all_possible_sh = tuple(sh for sh in ('dash', 'zsh', 'bash', 'posh', 'sh') if shutil.which(sh))
        for m in methods:
            for sh in all_possible_sh:
                with self.subTest(sh=sh, method=m):
                    pty = self.check_bootstrap(sh, tdir, extra_exec=f'{m}; echo "$login_shell"; exit 0', SHELL_INTEGRATION_VALUE='')
                    self.assertIn(expected_login_shell, pty.screen_contents())

        ok_login_shell = ''
        for sh in all_possible_sh:
            if sh == 'bash' and not bash_ok():
                continue
            for login_shell in ('', 'fish', 'zsh', 'bash'):
                if (login_shell and not shutil.which(login_shell)) or (login_shell == 'bash' and not bash_ok()):
                    continue
                ok_login_shell = login_shell
                with self.subTest(sh=sh, login_shell=login_shell), tempfile.TemporaryDirectory() as tdir:
                    self.check_bootstrap(sh, tdir, login_shell)
        # check that turning off shell integration works
        if ok_login_shell in ('bash', 'zsh'):
            for val in ('', 'no-rc'):
                with tempfile.TemporaryDirectory() as tdir:
                    self.check_bootstrap('sh', tdir, ok_login_shell, val)

    def check_bootstrap(self, sh, home_dir, login_shell='', SHELL_INTEGRATION_VALUE='enabled', extra_exec=''):
        script = bootstrap_script(
            EXEC_CMD=f'echo "UNTAR_DONE"; {extra_exec}',
            OVERRIDE_LOGIN_SHELL=login_shell,
            SHELL_INTEGRATION_VALUE=SHELL_INTEGRATION_VALUE,
        )
        env = basic_shell_env(home_dir)
        # Avoid generating unneeded completion scripts
        os.makedirs(os.path.join(home_dir, '.local', 'share', 'fish', 'generated_completions'), exist_ok=True)
        # prevent newuser-install from running
        open(os.path.join(home_dir, '.zshrc'), 'w').close()
        pty = self.create_pty(f'{sh} -c {shlex.quote(script)}', cwd=home_dir, env=env)
        del script

        def check_untar_or_fail():
            q = pty.screen_contents()
            if 'bzip2' in q:
                raise ValueError('Untarring failed with screen contents:\n' + q)
            return 'UNTAR_DONE' in q
        pty.wait_till(check_untar_or_fail)
        self.assertTrue(os.path.exists(os.path.join(home_dir, '.terminfo/kitty.terminfo')))
        if SHELL_INTEGRATION_VALUE != 'enabled':
            pty.wait_till(lambda: len(pty.screen_contents().splitlines()) > 1)
            self.assertEqual(pty.screen.cursor.shape, 0)
        else:
            pty.wait_till(lambda: pty.screen.cursor.shape == CURSOR_BEAM)
        return pty