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# -*- coding: utf-8 -*-

# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

from __future__ import absolute_import
from __future__ import print_function
from __future__ import division
import os
import pwd
from distutils.version import StrictVersion

from clselect.clselectctl import get_directory
from clselect.utils import check_call, check_output, list_dirs
from .extensions import EXTENSION_PATTERN, ExtensionInfo
from .interpreters import Interpreter


DEFAULT_PREFIX = 'rubyvenv'
RUBYVENV_BIN = os.path.join(os.path.dirname(__file__), 'rubyvenv.py')
VERSION_DELIMITER = '#'
PYTHON_PATH = '/opt/cloudlinux/venv/bin/python3'


class Environment(object):

    def __init__(self, name, user=None, prefix=None):
        self.name = name
        if user:
            self.user = user
        else:
            self.user = pwd.getpwuid(os.getuid()).pw_name
        if prefix is None:
            self.prefix = DEFAULT_PREFIX
        else:
            self.prefix = prefix
        self.path = os.path.join(_abs_prefix(self.user, self.prefix), name)
        self._interpreter = None
        self._gem = None
        self.interpreter_name = 'ruby' + name

    def __repr__(self):
        return ("%s.%s(name='%s', user='%s', prefix='%s')" % (
            self.__class__.__module__, self.__class__.__name__,
            self.name, self.user, self.prefix))

    def _demote(self):
        user_pwd = pwd.getpwnam(self.user)

        def func():
            os.setgid(user_pwd.pw_gid)
            os.setuid(user_pwd.pw_uid)

        return func

    def as_dict(self, key=None):
        e = {
            'name': self.name,
            'interpreter': self.interpreter(),
            'extensions': self.extensions(),
            }
        if key:
            del e[key]
            return {getattr(self, key): e}
        return e

    def as_deepdict(self, key=None):
        e = {
            'name': self.name,
            'interpreter': self.interpreter().as_dict(),
            'extensions': self.extensions(),
            }
        if key:
            del e[key]
            return {getattr(self, key): e}
        return e

    def create(self, interpreter=None):
        if not interpreter:
            interpreter = Interpreter(target_user=self.user)
        prompt = '(' + \
            get_directory(os.path.basename(self.prefix)) + ':' + self.name + \
            ')'
        check_call(
            PYTHON_PATH, RUBYVENV_BIN,
            '--prompt', prompt,
            '--ruby', interpreter.binary,
            self.path,
            preexec_fn=self._demote())

    def destroy(self):
        check_call('/bin/rm', '-r', '--interactive=never', self.path, preexec_fn=self._demote())

    def exists(self):
        return os.path.exists(self.path)

    def interpreter(self):
        if not self._interpreter:
            self._interpreter = Interpreter(prefix=self.path, target_user=self.user)
        return self._interpreter

    def gem(self):
        if not self._gem:
            self._gem = os.path.join(self.path, 'bin', 'gem')
        return self._gem

    def extension_install(self, extension):
        locked_extensions = ExtensionInfo.get_locked_extensions(self.interpreter_name)
        t = extension.split(VERSION_DELIMITER)
        extension, version = t[0], t[1:] or ''
        if StrictVersion(self.name) >= StrictVersion('2.6'):
            command = (self.gem(), 'install', '--no-document', extension)
        else:
            command = (self.gem(), 'install', '--no-rdoc', '--no-ri', extension)
        if version:
            version = version[0]
            command += ('-v', version)
        if ExtensionInfo.is_extensions_locked(locked_extensions, extension, version):
            raise ValueError("Extension '%s' install is prohibited. System extension" % extension)
        check_call(args=command, preexec_fn=self._demote())

    def extension_update(self, extension):
        check_call(self.gem(), 'update', extension, preexec_fn=self._demote())

    def extension_uninstall(self, extension):
        locked_extensions = ExtensionInfo.get_locked_extensions(self.interpreter_name)
        t = extension.split(VERSION_DELIMITER)
        extension, version = t[0], t[1:] or ''
        command = (self.gem(), 'uninstall', extension, '-x', '-a')
        if version:
            version = version[0]
            command += ('-v', version)
        if ExtensionInfo.is_extensions_locked(locked_extensions, extension, version):
            raise ValueError("Extension '%s' removal is prohibited" % extension)
        check_call(args=command, preexec_fn=self._demote())

    def extensions(self):
        result = {}
        locked_extensions = ExtensionInfo.get_locked_extensions(self.interpreter_name)
        output = check_output(self.gem(), 'list', '--local', preexec_fn=self._demote())
        extensions = EXTENSION_PATTERN.findall(output)
        docs = (ExtensionInfo.extension_doc(extension)
                for extension, _ in extensions)
        for (name, version), doc in zip(extensions, docs):
            if ExtensionInfo.is_extensions_locked(locked_extensions, name, version):
                version_diff = list(set([v.strip() for v in version.split(',')])
                                    - set(locked_extensions.get(name)))
                if version_diff and len(locked_extensions.get(name)) != 0:
                    result[name] = {'doc': doc, 'version': ', '.join(version_diff)}
            else:
                result[name] = {'doc': doc, 'version': version}

        return result


def _abs_prefix(user=None, prefix=None):
    if not prefix:
        prefix = DEFAULT_PREFIX
    if user:
        return os.path.join(pwd.getpwnam(user).pw_dir, prefix)
    else:
        return os.path.join(pwd.getpwuid(os.getuid()).pw_dir, prefix)


def environments(user=None, prefix=None):
    venv_path = _abs_prefix(user, prefix)
    try:
        env_list = list_dirs(venv_path)
    except OSError:
        return []
    envs = []
    for env_name in env_list:
        envs.append(Environment(env_name, user, prefix))
    return envs


def environments_dict(key, user=None, prefix=None):
    return dict(list(e.as_dict(key=key).items()) for e in environments(user, prefix))


def environments_deepdict(key, user=None, prefix=None):
    return dict(list(e.as_deepdict(key=key).items())
                for e in environments(user, prefix))