#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
#############################################################
#                                                           #
#      Copyright @ 2023 -  Dashingsoft corp.                #
#      All rights reserved.                                 #
#                                                           #
#      Pyarmor                                              #
#                                                           #
#      Version: 8.0.1 -                                     #
#                                                           #
#############################################################
#
#
#  @File: cli/register.py
#
#  @Author: Jondy Zhao (pyarmor@163.com)
#
#  @Create Date: Mon Jan  2 15:39:08 CST 2023
#
import os

from base64 import b64decode, urlsafe_b64encode
from json import loads as json_loads
from string import Template

from . import logger, CliError


# All supported machine flags for group license: [11, 26)
MACHFLAGS = 22, 21, 18, 20, 16, 11


def parse_token(data):
    from struct import unpack

    if not data or data.find(b' ') == -1:
        return {
            'token': 0,
            'rev': 0,
            'features': 0,
            'licno': 'pyarmor-vax-000000',
            'regname': '',
            'product': 'non-profits',
            'note': 'This is trial license'
        }

    buf = b64decode(data.split()[0])

    token, value = unpack('II', buf[:8])
    rev, features = value & 0xff, value >> 8
    licno = buf[16:34].decode('utf-8')

    pstr = []
    i = 64
    for k in range(4):
        n = buf[i]
        i += 1
        pstr.append(buf[i:i+n].decode('utf-8') if n else '')
        i += n

    product = 'non-profits(TBD)' if pstr[2] in ('', 'TBD') else pstr[2]
    return {
        'token': token,
        'rev': rev,
        'features': features,
        'licno': licno,
        'machine': pstr[0],
        'regname': pstr[1],
        'product': product,
        'note': pstr[3],
    }


class Register(object):

    def __init__(self, ctx):
        self.ctx = ctx
        self.notes = []

    def check_args(self, args):
        if args.upgrade and args.keyfile.endswith('.zip'):
            raise CliError('use .txt file to upgrade, not .zip file')

    def _get_old_rcode(self):
        old_license = self.ctx.read_license()
        if not old_license:
            logger.debug('no license file found')
            return
        if len(old_license) == 256:
            logger.debug('no old purchased license')
            return

        data = b64decode(old_license)
        i = data.find(b'pyarmor-vax-')
        if i == -1:
            raise CliError('no valid old license')
        return data[i:i+18].decode()

    def regurl(self, ucode, product=None, rcode=None, prepare=False):
        url = self.ctx.cfg['pyarmor']['regurl'] % ucode
        if product:
            url += '&product=' + \
                urlsafe_b64encode(product.encode('utf-8')).decode()
        if rcode:
            url += '&rcode=' + rcode
        if prepare:
            url += '&prepare=1'
        return url

    def update_token(self):
        from .core import Pytransform3
        assert Pytransform3._pytransform3 is None
        with open(self.ctx.license_token, 'wb') as f:
            f.close()
        Pytransform3.init(self.ctx)

    @property
    def license_info(self):
        return parse_token(self.ctx.read_token())

    def _license_type(self, info):
        return 'basic' if info['features'] == 1 else \
            'pro' if info['features'] == 7 else \
            'group' if info['features'] == 15 else \
            'trial' if info['token'] == 0 else 'unknown'

    def _license_to(self, info):
        name = info['regname']
        product = info['product']
        return '%s (%s)' % (product, name) if name and product else \
            'non-profits' if not name else 'non-profits (%s)' % name

    def parse_keyfile(self, filename):
        with open(filename, 'r', encoding='utf-8') as f:
            for line in f:
                line = line.strip()
                marker = 'Dear '
                if line.startswith(marker):
                    regname = line[len(marker):].strip(' ,')
                    break

            for line in f:
                line = line.strip()
                if len(line) == 192 and line.find(' ') == -1:
                    return regname, line

        raise CliError('no registration code found in %s' % filename)

    def register_regfile(self, regfile, clean=True):
        from zipfile import ZipFile

        path = self.ctx.reg_path
        with ZipFile(regfile, 'r') as f:
            for item in ('license.lic', '.pyarmor_capsule.zip'):
                logger.debug('extracting %s', item)
                f.extract(item, path=path)
            namelist = f.namelist()
            if 'group.tokens' in namelist:
                logger.info('machine id in group license: %s', ', '.join([
                    x[7:] for x in namelist if x.startswith('tokens')
                ]))
                for idver in MACHFLAGS:
                    machid = self._get_machine_id(idver).decode('utf-8')
                    logger.info('got machine id: %s', machid)
                    name = '/'.join(['tokens', machid])
                    if name in namelist:
                        logger.info('this machine id matchs group license')
                        break
                else:
                    logger.info('no machine id matchs this group license')
                    logger.info('take this machine as docker container, and '
                                'connect to docker host for authentication...')
                    mlist = self._get_docker_hostname()
                    if not mlist:
                        logger.info(
                            'could not get docker host machine id\n%s',
                            '\n'.join([
                                '',
                                'if this machine is docker container, please '
                                'run command `pyarmor-auth` in docker host, '
                                'and try it again', '',
                                'otherwise please generate new group '
                                'device license for this machine', '',
                                'more information please check section '
                                '"using group license" in documentation '
                                '"how-to register" guide', ''
                            ]))
                        raise CliError('this group device license is not for '
                                       'this machine')
                    for machid in mlist:
                        hostname = '/'.join(['tokens', machid])
                        if hostname in namelist:
                            name = hostname
                            break
                    else:
                        logger.debug('docker host machine ids: %s', mlist)
                        raise CliError('this group device license is not for '
                                       'this docker host')
                logger.debug('extracting %s', name)
                self.ctx.save_token(f.read(name))
                return
            if 'group.info' in namelist:
                logger.info('refer to http://pyarmor.readthedocs.io/en/stable/how-to/register.html'
                            '#using-group-license')
                raise CliError('wrong usage for group license')

        logger.info('update license token')
        self.update_token()

    def _get_docker_hostname(self):
        try:
            from socket import socket, AF_INET, SOCK_STREAM
            host = os.getenv('PYARMOR_DOCKER_HOST', 'host.docker.internal')
            port = 29092
            rlist = []
            with socket(AF_INET, SOCK_STREAM) as s:
                s.connect((host, port))
                s.sendall(b'PADH' + b'x' * 60)
                while True:
                    flag = s.recv(1)
                    if ord(flag) - 87 in MACHFLAGS:
                        data = s.recv(32)
                    machid = (flag + data).decode('utf-8')
                    logger.info('got docker host machine id: %s', machid)
                    rlist.append(machid)
                    if s.recv(1) == b'\x00':
                        break
            return rlist
        except Exception as e:
            logger.debug('%s:%d:%s', host, port, str(e))

    def _get_machine_id(self, devflag=11):
        from .core import Pytransform3
        return Pytransform3.get_hd_info(devflag)

    def generate_group_device(self, devid):
        from datetime import datetime
        from platform import uname
        path = self.ctx.group_device_file(devid)
        logger.info('generating device file "%s"', path)
        os.makedirs(os.path.dirname(path), exist_ok=True)
        uinfo = uname()
        devflag = self.ctx.cfg['builder'].getint('group_device_flag', 21)
        machid = self._get_machine_id(devflag).decode('utf-8')
        logger.info('current machine id is "%s"', machid)
        tpl = Template('\n'.join([
            '# Generated by Pyarmor $rev, $timestamp',
            'host: $node',
            'system: $host ($version)',
            'machine: $machine'
        ])).substitute(
            rev='.'.join(self.ctx.version),
            node=uinfo.node,
            host=uinfo.system,
            version=uinfo.version,
            timestamp=datetime.now().isoformat(),
            machine=machid,
        )
        with open(path, "wb") as f:
            f.write(tpl.encode('utf-8'))
        return path

    def check_group_license(self, silent=False):
        licinfo = self.ctx.license_info
        if licinfo['features'] & 8:
            licmach = licinfo.get('machine', '')
            if not licmach:
                raise RuntimeError('no token machine')

            idver = ord(licmach[0]) - 87
            # This can't be called in "cmd_gen", otherwise crash
            machid = self._get_machine_id(idver).decode('utf-8')
            if machid == licmach:
                return

            mlist = self._get_docker_hostname()
            if mlist and licmach in mlist:
                return

            logger.info('this license is for machine: %s', licmach)

            if mlist:
                logger.info('but docker host machine ids: %s',
                            ', '.join(mlist))
                raise RuntimeError(
                    'this group license is not for this docker host')
            else:
                logger.info('but this machine id: %s', machid)
                raise RuntimeError(
                    'this group license is not for this machine')

    def __str__(self):
        '''$advanced

Notes
$notes
'''

        info = self.license_info
        lictype = self._license_type(info)

        fmt = '%-16s: %s'
        lines = [
            fmt % ('License Type', 'pyarmor-' + lictype),
            fmt % ('License No.', info['licno']),
            fmt % ('License To', info['regname']),
            fmt % ('License Product', info['product']),
            '',
        ]

        bccmode = info['features'] & 2
        rftmode = info['features'] & 4
        advanced = [
            fmt % ('BCC Mode', 'Yes' if bccmode else 'No'),
            fmt % ('RFT Mode', 'Yes' if rftmode else 'No'),
        ]
        if lictype == 'trial':
            self.notes.append('* Can\'t obfuscate big script and mix str')
        elif lictype in ('bacic', 'pro'):
            self.notes.append('* Need verify license online '
                              'when obfuscating scripts')
        elif lictype == 'group':
            self.notes.append('* Offline obfuscation')

        lines.append(Template(self.__str__.__doc__).substitute(
            advanced='\n'.join(advanced),
            notes='\n'.join(self.notes),
        ))

        return '\n'.join(lines)


upgrade_to_basic_info = Template('''
You are about to upgrade old Pyarmor license to Pyarmor Basic License

The upgraded license information will be''')

upgrade_to_pro_info = Template('''
You are about to upgrade old Pyarmor license to Pyarmor Pro License

The original license no: $rcode

The upgraded license information will be''')


class WebRegister(Register):

    def _request(self, url):
        from http.client import HTTPSConnection
        n = len('https://')
        k = url.find('/', n)
        conn = HTTPSConnection(url[n:k])
        conn.request("GET", url[k:])
        return conn.getresponse()

    def _send_request(self, url, timeout=6.0):
        try:
            return self._request(url)
        except Exception as e:
            logger.debug('direct request failed "%s"', str(e))

        from urllib.request import urlopen
        from ssl import _create_unverified_context
        context = _create_unverified_context()
        return urlopen(url, None, timeout, context=context)

    def _remove_token(self):
        if os.path.exists(self.ctx.license_token):
            logger.debug('remove old token')
            os.remove(self.ctx.license_token)

    def _check_product_name(self, name):
        if len(name) == 1 or name.count(name[0]) == len(name):
            raise RuntimeError('invalid product name "%s"' % name)

    def prepare(self, keyfile, product, upgrade=False):
        reginfo = self.parse_keyfile(keyfile)
        logger.info('prepare "%s"', keyfile)

        self._check_product_name(product)

        rcode = self._get_old_rcode() if upgrade else None
        if upgrade and not rcode and keyfile.endswith('regcode-to-pro.txt'):
            logger.error('please use `pyarmor-7 -v` to check old license')
            logger.error('this code is used to upgrade old license')
            raise CliError('no found old license in this machine')
        url = self.regurl(reginfo[1], rcode=rcode, prepare=True)
        logger.debug('url: %s', url)

        logger.info('query key file from server')
        with self._send_request(url) as res:
            if not res:
                logger.error('please try it later')
                raise CliError('no response from license server')
            if res.code != 200:
                logger.error('HTTP Error %s', res.code)
                raise CliError(res.read().decode('utf-8'))
            info = json_loads(res.read())

        pname = info['product']
        if pname in ('', 'TBD'):
            info['product'] = product
        elif pname != product:
            logger.warning('this license has bound to product "%s"', pname)
            logger.warning('it can not be changed to "%s"', product)

        lines = []
        if upgrade:
            if rcode and not rcode.startswith('pyarmor-vax-'):
                logger.error('please check Pyarmor 8 EULA')
                raise CliError('old license "%s" can not be upgraded' % rcode)
            if info['upgrade']:
                lines.append(upgrade_to_pro_info.substitute(rcode=rcode))
            else:
                lines.append(upgrade_to_basic_info.substitute())
        else:
            if info['lictype'] not in ('BASIC', 'PRO', 'GROUP'):
                logger.error('this license does not work in Pyarmor 8')
                logger.error('please check Pyarmor 8.0 EULA')
                raise CliError('unknown license type %s' % info['lictype'])
            lines.append('This license registration information will be')

        if info['product'] in ('', 'TBD') and info['lictype'] == 'GROUP':
            raise CliError('"TBD" is invalid product name for group license')

        fmt = '%-16s: %s'
        lines.extend([
            '',
            fmt % ('License Type', 'pyarmor-' + info['lictype'].lower()),
            fmt % ('License To', info['regname']),
            fmt % ('License Product', info['product']),
            '',
        ])
        if info['product'] == 'non-profits':
            lines.append('This license is about to be used for non-profits')
        if info['product'] in ('', 'TBD'):
            lines.append('This license is bind to non-profits(TBD) '
                         'for the time being')
            lines.append('If not change "TBD" to product name in 6 months, '
                         'it will be set to "non-profits" automatically')
        else:
            lines.append('This license is about to be used for product "%s"'
                         % info['product'])
        if info['product'] not in ('', 'TBD'):
            lines.append('')
            lines.append('IMPORTANT: PRODUCT NAME CAN NOT BE CHANGED '
                         'AFTER INITIAL REGISTRATION')

        lines.extend(['', ''])
        return info, '\n'.join(lines)

    def upgrade_to_pro(self, keyfile, product):
        logger.info('process upgrading file "%s"', keyfile)
        reginfo = self.parse_keyfile(keyfile)

        rcode = self._get_old_rcode()
        logger.info('old license no: %s', rcode)

        url = self.regurl(reginfo[1], product=product, rcode=rcode)
        logger.debug('url: %s', url)

        logger.info('send upgrade request to server')
        res = self._send_request(url)
        regfile = self._handle_response(res)

        logger.info('update license token')
        self.update_token()
        logger.info('This license has been upgraded successfully')

        notes = '* Please backup regfile "%s" carefully, and ' \
            'use this file for subsequent registration' % regfile,
        logger.info('Import Notes:\n\n%s\n', notes)

    def register(self, keyfile, product, upgrade=False, group=False):
        if keyfile.endswith('.zip'):
            logger.info('register "%s"', keyfile)
            self.register_regfile(keyfile)
            return

        logger.info('process activation file "%s"', keyfile)
        reginfo = self.parse_keyfile(keyfile)

        url = self.regurl(reginfo[1], product=product)
        if upgrade:
            url += '&upgrade_to_basic=1'
        logger.debug('url: %s', url)

        logger.info('send request to server')
        res = self._send_request(url)
        regfile = self._handle_response(res)

        notes = [
            '* Please backup regfile "%s" carefully, and '
            'use this file for subsequent registration' % regfile,
            '* Do not use "%s" again' % os.path.basename(keyfile),
        ]

        if group:
            logger.info('This group license has been activated sucessfully')
            notes.append('* Please check `pyarmor reg` in Man page for '
                         'how to register Pyarmor on offline device')
        else:
            logger.info('register "%s"', regfile)
            self.register_regfile(regfile)
            logger.info('This license code has been %s successfully',
                        'upgraded' if upgrade else 'activated')

        logger.info('Import Notes:\n\n%s\n', '\n'.join(notes))

    def _handle_response(self, res):
        if res and res.code == 200:
            dis = res.headers.get('Content-Disposition')
            filename = dis.split('"')[1] if dis else 'pyarmor-regfile.zip'
            logger.info('write registration file "%s"', filename)
            data = res.read()
            if data.startswith(b'{"group":'):
                n = data.find(b'}') + 1
                with open(filename, 'wb') as f:
                    f.write(data[n:])
                self._write_group_info(filename, data[:n])
            else:
                with open(filename, 'wb') as f:
                    f.write(data)
            return filename

        elif res:
            raise CliError(res.read().decode('utf-8'))

        raise CliError('no response from license server')

    def _write_group_info(self, filename, data):
        from zipfile import ZipFile
        logger.info('write group information')
        with ZipFile(filename, 'a') as f:
            f.writestr('group.info', data)

    def register_group_device(self, regfile, devid, rev=1):
        from zipfile import ZipFile
        devfile = self.ctx.group_device_file(devid)
        logger.info('register device file "%s"', devfile)
        logger.info('use group license "%s"', regfile)
        if not os.path.exists(devfile):
            logger.error('please generate device file in offline device by')
            logger.error('    pyarmor reg -g %s', devid)
            logger.error('and copy generated device file to this machine')
            raise CliError('no group device file "%s"' % devfile)

        with open(devfile) as f:
            prefix = 'machine:'
            for line in f:
                if line.startswith(prefix):
                    machid = line[len(prefix):].strip()
                    break
            else:
                logger.error('no machid information in device file')
                raise CliError('invalid device file "%s"' % devfile)

        with ZipFile(regfile, 'r') as f:
            if 'group.info' not in f.namelist():
                logger.error('no group information in group license file')
                raise CliError('invalid group license file "%s"' % regfile)
            group = json_loads(f.read('group.info'))
            licdata = f.read('license.lic')
            capsule = f.read('.pyarmor_capsule.zip')

        # Ignore token cache
        tokencache = os.path.join(os.path.dirname(devfile), 'tokens', machid)
        if False and os.path.exists(tokencache):
            logger.info('read cached "%s"', tokencache)
            with open(tokencache, 'rb') as f:
                data = f.read()
            filename = regfile.replace('pyarmor-', 'pyarmor-device-').replace(
                '.zip', '.%s.zip' % devid)
            logger.info('write registeration file "%s"', filename)
        else:
            logger.info('send request to server')
            url = self.regurl('/'.join(['group', group['ucode']]))
            paras = ('rev', str(rev)), ('group', str(group['group'])), \
                ('source', machid), ('devid', str(devid))
            url += '&'.join(['='.join(x) for x in paras])
            logger.debug('url: %s', url)

            res = self._send_request(url)
            filename = self._handle_response(res)
            with open(filename, 'rb') as f:
                data = f.read()
            os.makedirs(os.path.dirname(tokencache), exist_ok=True)
            with open(tokencache, 'wb') as f:
                f.write(data)

        with ZipFile(filename, 'w') as f:
            f.writestr('license.lic', licdata)
            f.writestr('.pyarmor_capsule.zip', capsule)
            f.writestr('group.tokens', b'')
            f.writestr('tokens/' + machid, data)

        logger.info('please copy deivce regfile to offline device and run')
        logger.info('    pyarmor reg %s', filename)
