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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 print_function
from __future__ import absolute_import
from __future__ import division

import os
import pwd
import requests
import requests.packages.urllib3.exceptions as urllib_exceptions  # pylint: disable=E0401
import shutil
from requests.exceptions import ConnectionError
from future.utils import iteritems
from past.builtins import basestring

from . import clpassenger
from . import clselectctl
from . import utils
from clcommon.cpapi import userdomains
from clcommon.utils import mod_makedirs
from .clselectexcept import ClSelectExcept
from .clselectnodejs.apps_manager import ApplicationsManager
from .clselectnodejsuser import environments, interpreters
from .baseclselect import APP_STARTED_CONST, APP_STOPPED_CONST
from .clselectprint import clprint

DEFAULT_STARTUP_FILE = "app.js"
DEFAULT_APP_STATE = APP_STARTED_CONST

def _create_environment(user, directory, version, env_name=None, destroy_first=False):
    prefix = _get_prefix(user, directory)
    if not env_name:
        env_name = version
    environment = environments.Environment(env_name, user, prefix)
    if not environment.exists() or destroy_first:
        try:
            interpreter = interpreters.interpreters(key="version")[version]
        except KeyError:
            raise ClSelectExcept.NoSuchAlternativeVersion(version)
        environment.create(interpreter, destroy_first=destroy_first)
    return environment

def _get_environment(user, directory, app_summary=None):
    prefix = _get_prefix(user, directory)
    if app_summary is None:
        user_summary = clpassenger.summary(user)
        try:
            app_summary = utils.get_using_realpath_keys(user, directory, user_summary)
        except KeyError:
            raise ClSelectExcept.NoSuchApplication(
                'No such application (or application not configured) "%s"' % directory
            )
    binary = app_summary["binary"]
    env_name = os.path.basename(os.path.dirname(os.path.dirname(binary)))
    environment = environments.Environment(env_name, user, prefix)
    return environment

def _get_prefix(user, directory):
    _, rel_dir = utils.get_abs_rel(user, directory)
    return os.path.join(environments.DEFAULT_PREFIX, rel_dir)

def _ensure_version_enabled(version, user):
    """
    Check whether particular interpreter version is enabled and raises
    exception if not
    :param user: user to include in exception
    """
    from .clselectnodejs import node_manager

if not node_manager.NodeManager().is_version_enabled(version):
        raise ClSelectExcept.UnableToSetAlternative(user, version, "version is not enabled")

def _get_existing_nesting_app_for(new_app_directory, user, apps_manager=None):
    """
    Return None if new_app_directory is not nested inside an existing
    user application, and the name of conflicting application otherwise
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

abs_app_path, _ = utils.get_abs_rel(user, new_app_directory)
    full_config = apps_manager.get_user_config_data(user)
    for existing_app in full_config.keys():
        # In case home directory was symlinked after config was written
        existing_app_abs_path, _ = utils.get_abs_rel(user, existing_app)
        if (abs_app_path + os.sep).startswith(existing_app_abs_path + os.sep):
            return existing_app
    return None

def create(
    user,
    directory,
    alias,
    version=None,
    doc_root=None,
    app_mode=None,
    env_vars=None,
    startup_file=None,
    domain_name=None,
    apps_manager=None,
    passenger_log_file=None,
):
    """
    Create application
    :param user: unix user name
    :param directory: application path in user's home (app-root)
    :param alias: alias (app-uri)
    :param version: version of interpreter
    :param doc_root: doc_root
    :param app_mode: application mode for nodejs
    :param env_vars: dict with enviroment variables
    :param startup_file: main application file
    :param domain_name: domain name
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :param passenger_log_file: Passenger log filename to write to app's .htaccess
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

if version is None:
        raise ClSelectExcept.WrongData("Not passed version as argument")
    _ensure_version_enabled(version, user)

if startup_file is None:
        startup_file = DEFAULT_STARTUP_FILE
    if env_vars is None:
        env_vars = {}
    if app_mode is None:
        app_mode = "production"

conflicting_app = _get_existing_nesting_app_for(directory, user, apps_manager)
    if conflicting_app is not None:
        raise ClSelectExcept.BusyApplicationRoot(conflicting_app)

alias = clselectctl.get_alias(alias)
    environment = _create_environment(user, directory, version)
    binary = environment.interpreter().binary

clpassenger.configure(
        user,
        directory,
        alias,
        apps_manager.INTERPRETER,
        binary,
        doc_root=doc_root,
        startup_file=startup_file,
        passenger_log_file=passenger_log_file,
    )
    #  webapp was started
    clpassenger.restart(user, directory)
    if not domain_name:
        # if domain name not defined - try to detemine it
        summary_data = clpassenger.summary(user)
        app_summary = utils.get_using_realpath_keys(user, directory, summary_data)
        domain_name = app_summary["domain"]
    app_data = {
        "nodejs_version": version,
        "domain": domain_name,
        "app_uri": alias,
        "app_status": DEFAULT_APP_STATE,
        "startup_file": startup_file,
        "app_mode": app_mode,
        "config_files": [],
        "env_vars": env_vars,
    }
    if passenger_log_file:
        app_data["passenger_log_file"] = passenger_log_file
    apps_manager.add_app_to_config(user, directory, app_data)
    try:
        apps_manager.add_env_vars_for_htaccess(user, directory, env_vars, doc_root)
    except Exception as err:
        clprint.print_diag("text", {"status": "ERROR", "message": str(err)})

def _create_symlink_to_node_modules(username, environment_path, app_root):
    """
    Creates symlink to app's node_modules in app_root
    :param username: user name
    :param environment_path: Path to app's virtual environment
    :param app_root: Application root
    :return: None
    """
    # This function logic is duplicated in npm wrapper, but we still need it here too. See commit
    # message of LVEMAN-1335
    message = (
        "Cloudlinux NodeJS Selector demands to store node modules for application "
        "in separate folder (virtual environment) pointed by symlink "
        'called "node_modules". That`s why application should not contain folder/file '
        "with such name in application root"
    )
    link_name = os.path.join(pwd.getpwnam(username).pw_dir, app_root, "node_modules")
    if os.path.islink(link_name):
        try:
            os.remove(link_name)
        except OSError:
            raise ClSelectExcept.RemoveSymlinkError("Can`t remove symlink %(link_name)s" % {"link_name": link_name})
    elif os.path.exists(link_name):  # link_name not a old symlink, but exists
        raise ClSelectExcept.SymlinkError(message)
    link_to = os.path.join(environment_path, "lib/node_modules")
    if not os.path.exists(link_to):
        mod_makedirs(link_to, 0o775)
    try:
        os.symlink(link_to, link_name)
    except OSError:
        raise ClSelectExcept.CreateSymlinkError("Error creating symlink. " + message)

def destroy(user, app_directory, doc_root, apps_manager=None):
    """
    Destroy web app with specified directory for specified user
    :param user: username
    :param app_directory: application directory
    :param doc_root: Document root for selected domain
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

# get app state
    app_config = apps_manager.get_app_config(user, app_directory)
    # remove env from htaccess
    try:
        # if domain is already removed we shouldn't do anything
        if doc_root is not None:
            apps_manager.add_env_vars_for_htaccess(user, app_directory, None, doc_root)
    except Exception as err:
        clprint.print_diag("text", {"status": "ERROR", "message": str(err)})

if app_config.get("app_status") == APP_STOPPED_CONST:
        # stopped app
        user_home = pwd.getpwnam(user).pw_dir
        # Remove app's nodenv, e.g. /home/cltest1/nodevenv/test_app
        nodevenv_path = "/".join([user_home, "nodevenv", app_directory])
        try:
            # Remove app's nodenv, e.g. /home/cltest1/nodevenv/test_app
            shutil.rmtree(nodevenv_path)
        except OSError:
            pass
        # if domain is already removed we shouldn't do anything
        if doc_root is not None:
            # Remove NodeJS lines from .htaccess
            htaccess_filename = apps_manager.get_htaccess_by_appdir(user, app_directory, doc_root)
            clpassenger.remove_passenger_lines_from_htaccess(htaccess_filename)
        # remove app from node-selector.json file
        apps_manager.remove_app_from_config(user, app_directory)
        # Update application status in passenger
        try:
            clpassenger.restart(user, app_directory)
        except ClSelectExcept.MissingApprootDirectory:
            pass
        return
    # Moved before removing an app from node-selector.json because in case if
    # app_root is absent we still want to remove venv dir of an application.
    # The method didn't anyhing if app_root is absent and skip other commands
    # including removal of a venv dir
    prefix = _get_prefix(user, app_directory)
    abs_dir, _ = utils.get_abs_rel(user, prefix)
    try:
        # Remove app's nodenv, e.g. /home/cltest1/nodevenv/test_app
        shutil.rmtree(abs_dir)
    except OSError:
        pass
    user_summary = clpassenger.summary(user)
    # remove app from node-selector.json file
    app_in_config = apps_manager.remove_app_from_config(user, app_directory)
    try:
        utils.get_using_realpath_keys(user, app_directory, user_summary)
    except KeyError:
        # if app was existed and app's dir is not exists, we skip all further actions
        if app_in_config:
            return None
        else:
            raise ClSelectExcept.WrongData('No such application (or application not configured) "%s"' % app_directory)

# remove app from passenger
    clpassenger.unconfigure(user, app_directory)  # Clear .htaccess
    try:
        clpassenger.restart(user, app_directory)
    except ClSelectExcept.MissingApprootDirectory:
        pass

def start(user, app_directory, doc_root, apps_manager=None):
    """
    Starts web app with specified directory for specified user
    :param user: username
    :param app_directory: application directory
    :param doc_root: Document root for selected domain
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

app_config = apps_manager.get_app_config(user, app_directory)
    if app_config is None:
        raise ClSelectExcept.WrongData('No such application (or application not configured) "%s"' % app_directory)
    # Do nothing if application already started
    if app_config.get("app_status") == APP_STARTED_CONST:
        return
    # Create .htaccess file for the application
    apps_manager.update_htaccess_file(user, app_directory, doc_root)
    # Save new application status in user's config
    apps_manager.set_app_status(user, app_directory, APP_STARTED_CONST)
    # Update application status in passenger
    clpassenger.restart(user, app_directory)

def restart(user, app_directory, doc_root, apps_manager=None):
    """
    Restarts web app with specified directory for specified user
    :param user: username
    :param app_directory: application directory
    :param doc_root: Document root for selected domain
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

def stop(user, app_directory, doc_root, apps_manager=None):
    """
    Stops web app with specified directory for specified user
    :param user: username
    :param app_directory: application directory
    :param doc_root: Document root for selected domain
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

app_config = apps_manager.get_app_config(user, app_directory)
    if app_config is None:
        raise ClSelectExcept.WrongData('No such application (or application not configured) "%s"' % app_directory)
    # Do nothing if application is not started
    if app_config.get("app_status") == APP_STOPPED_CONST:
        return
    htaccess_filename = apps_manager.get_htaccess_by_appdir(user, app_directory, doc_root, app_config)
    # Remove NodeJS lines from .htaccess
    clpassenger.remove_passenger_lines_from_htaccess(htaccess_filename)
    # Save new application status in user's config
    apps_manager.set_app_status(user, app_directory, APP_STOPPED_CONST)
    # Update application status in passenger
    clpassenger.restart(user, app_directory)

def check_response_from_webapp(domain, alias, action=None):
    """
    Check response from user's webapp before and after calling action.
    Also compare both responses
    :param domain: domain associated with webapp
    :param alias: URI associated with webapp
    :param action: called action, that make something with webapp: install modules, transit it, etc
    :return: None
    """

app_is_inaccessible_before = 'Web application is inaccessible by its address "%s". The operation wasn\'t performed.'
    app_is_inaccessible_after = (
        "The operation was performed, but check availability of application has failed. "
        'Web application is inaccessible by its address "%s" after the operation.'
    )
    app_is_broken = (
        "The operation was performed, but check availability of application has failed. "
        'Web application responds, but its return code "%s" or '
        'content type before operation "%s" doesn\'t equal to contet type after operation "%s".'
    )

requests.packages.urllib3.disable_warnings(urllib_exceptions.InsecureRequestWarning)  # pylint: disable=E1101

if not callable(action):
        raise ClSelectExcept.WrongData("Wrong action for calling in checking webapp")
    webapp_url = "https://{domain}/{alias}".format(
        domain=domain,
        alias=alias,
    )
    # for hiding from the module of Apache `mod_security`
    headers = {
        "User-Agent": "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.13) "
        "Gecko/20101209 CentOS/3.6-2.el5.centos Firefox/3.6.13"
    }
    try:
        # Applies only to wildcard domains because '*' allows accessing URLs like
        # Example: http://{anything}.domain/nodejs_app.
        webapp_url = utils.transform_wildcard_url(webapp_url)
        request = requests.get(webapp_url, verify=False, headers=headers)
    except ConnectionError:
        # site is not available by https protocol
        webapp_url = webapp_url.replace("https://", "http://")
        try:
            request = requests.get(webapp_url, verify=False, headers=headers)
        except ConnectionError:
            raise ClSelectExcept.WebAppError(app_is_inaccessible_before % webapp_url)
    before_mime_type = request.headers.get("Content-Type")
    before_status = request.headers.get("Status")
    action()
    try:
        request = requests.get(webapp_url, verify=False, headers=headers)
    except ConnectionError:
        raise ClSelectExcept.WebAppError(app_is_inaccessible_after % webapp_url)
    after_mime_type = request.headers.get("Content-Type")
    after_status = request.headers.get("Status")
    # assume that app is broken if:
    # it's response Content-Type or Status code (if first code wasn't 500) changed
    # if last Status code was 500 (internal error)
    if (
        before_mime_type.lower() != after_mime_type.lower()
        or (before_status != after_status and before_status is not None and before_status[:3] != "500")
        or (after_status is not None and after_status[:3] == "500")
    ):
        raise ClSelectExcept.WebAppError(app_is_broken % (after_status, before_mime_type, after_mime_type))

def _get_info_about_webapp(app_summary=None, user=None):
    """
    Get info (alias and domain) about user's web application
    :param app_summary: dict -> summary info about user's web application
    :param user: str -> name of unix user
    :return: tuple -> (alias, domain)
    """

if app_summary is None:
        raise ClSelectExcept.WrongData("Was passed incorrect summary info about application")
    if user is None:
        raise ClSelectExcept.WrongData("Was passed incorrect name of user")
    alias = app_summary["alias"]
    user_domains = userdomains(user)
    found_domains = [
        domain for domain, doc_root in user_domains if utils.realpaths_are_equal(user, doc_root, app_summary["docroot"])
    ]
    if len(found_domains) == 0:
        raise ClSelectExcept.WrongData("Can not found suitable domain for application")
    app_domain = found_domains[0]

return alias, app_domain

def install(user, directory, extension="-", skip_web_check=False, apps_manager=None):
    """
    Install nodejs extension to user's webapp
    :param user: name os unix user
    :param directory: directory with webapp (app-root)
    :param extension: name and version of extension
    :param skip_web_check: skip check web application after change it's properties
    :param apps_manager: Application Manager. Class that responsible
           for gathering and writing information about applications
    :return: None
    """

if apps_manager is None:
        apps_manager = ApplicationsManager()

user_config = apps_manager.get_user_config_data(user)
    try:
        app_data = utils.get_using_realpath_keys(user, directory, user_config)
    except KeyError:
        raise ClSelectExcept.WrongData("Record about application {} is absent".format(directory))
    if app_data["app_status"] != APP_STARTED_CONST:
        skip_web_check = True
    else:
        alias = app_data["app_uri"]
        app_domain = app_data["domain"]
    nodejs_version = app_data["nodejs_version"]
    cwd, _ = utils.get_abs_rel(user, directory)
    environment = _create_environment(user, directory, nodejs_version)

def action():
        # npm install
        environment.extension_install(extension=extension, cwd=cwd)
        clpassenger.restart(user, directory)

if not skip_web_check:
        try:
            check_response_from_webapp(
                domain=app_domain,
                alias=alias,
                action=action,
            )
        except ClSelectExcept.WebAppError as err:
            raise ClSelectExcept.WebAppError("An error occured during installation of modules. %s" % err)
    else:
        action()

def summary(user):
    summ = {}
    for directory, data in iteritems(clpassenger.summary(user)):
        if data["interpreter"] != ApplicationsManager.INTERPRETER:
            continue

environment = _get_environment(user, directory, data).as_deepdict()
        summ[directory] = {
            "domain": data["domain"],
            "alias": data["alias"],
            "environment": environment["name"],
            "interpreter": environment["interpreter"],
        }
        # add only list with additions domains
        if "domains" in data and len(data["domains"]) > 1:
            summ[directory]["domains"] = data["domains"]

return summ

def validate_env_vars(env_vars):
    if type(env_vars) is not dict:
        raise TypeError
    for item in env_vars:
        if not isinstance(env_vars[item], basestring):
            raise TypeError
    return env_vars

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