""" Superuser API. """

import string
import logging
import os

from random import SystemRandom
from flask import request

import features

from app import app, avatar, superusers, authentication, config_provider
from endpoints.api import (ApiResource, nickname, resource, validate_json_request,
                           internal_only, require_scope, show_if, parse_args,
                           query_param, abort, require_fresh_login, path_param, verify_not_prod)
from endpoints.api.logs import get_logs, get_aggregate_logs
from data import model
from auth.permissions import SuperUserPermission
from auth import scopes
from util.useremails import send_confirmation_email, send_recovery_email


logger = logging.getLogger(__name__)


def get_immediate_subdirectories(directory):
  return [name for name in os.listdir(directory) if os.path.isdir(os.path.join(directory, name))]


def get_services():
  services = set(get_immediate_subdirectories(app.config['SYSTEM_SERVICES_PATH']))
  services = services - set(app.config['SYSTEM_SERVICE_BLACKLIST'])
  return services


@resource('/v1/superuser/systemlogs/<service>')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserGetLogsForService(ApiResource):
  """ Resource for fetching the kinds of system logs in the system. """
  @require_fresh_login
  @verify_not_prod
  @nickname('getSystemLogs')
  @require_scope(scopes.SUPERUSER)
  def get(self, service):
    """ Returns the logs for the specific service. """
    if SuperUserPermission().can():
      if not service in get_services():
        abort(404)

      logs = []
      try:
        with open(app.config['SYSTEM_LOGS_FILE'], 'r') as f:
          logs = [line for line in f if line.find(service + '[') >= 0]

      except Exception:
        logger.exception('Cannot read logs')
        abort(400)

      return {
        'logs': '\n'.join(logs)
      }

    abort(403)


@resource('/v1/superuser/systemlogs/')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserSystemLogServices(ApiResource):
  """ Resource for fetching the kinds of system logs in the system. """
  @require_fresh_login
  @verify_not_prod
  @nickname('listSystemLogServices')
  @require_scope(scopes.SUPERUSER)
  def get(self):
    """ List the system logs for the current system. """
    if SuperUserPermission().can():
      return {
        'services': list(get_services())
      }

    abort(403)


@resource('/v1/superuser/aggregatelogs')
@internal_only
class SuperUserAggregateLogs(ApiResource):
  """ Resource for fetching aggregated logs for the current user. """
  @require_fresh_login
  @verify_not_prod
  @nickname('listAllAggregateLogs')
  @parse_args
  @query_param('starttime', 'Earliest time from which to get logs. (%m/%d/%Y %Z)', type=str)
  @query_param('endtime', 'Latest time to which to get logs. (%m/%d/%Y %Z)', type=str)
  def get(self, args):
    """ Returns the aggregated logs for the current system. """
    if SuperUserPermission().can():
      start_time = args['starttime']
      end_time = args['endtime']

      return get_aggregate_logs(start_time, end_time)

    abort(403)


@resource('/v1/superuser/logs')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserLogs(ApiResource):
  """ Resource for fetching all logs in the system. """
  @require_fresh_login
  @verify_not_prod
  @nickname('listAllLogs')
  @parse_args
  @query_param('starttime', 'Earliest time from which to get logs (%m/%d/%Y %Z)', type=str)
  @query_param('endtime', 'Latest time to which to get logs (%m/%d/%Y %Z)', type=str)
  @query_param('page', 'The page number for the logs', type=int, default=1)
  @require_scope(scopes.SUPERUSER)
  def get(self, args):
    """ List the usage logs for the current system. """
    if SuperUserPermission().can():
      start_time = args['starttime']
      end_time = args['endtime']

      return get_logs(start_time, end_time, page=args['page'])

    abort(403)


def org_view(org):
  return {
    'name': org.username,
    'email': org.email,
    'avatar': avatar.get_data_for_org(org),
  }

def user_view(user, password=None):
  user_data = {
    'username': user.username,
    'email': user.email,
    'verified': user.verified,
    'avatar': avatar.get_data_for_user(user),
    'super_user': superusers.is_superuser(user.username),
    'enabled': user.enabled,
  }

  if password is not None:
    user_data['encrypted_password'] = authentication.encrypt_user_password(password)

  return user_data

@resource('/v1/superuser/changelog/')
@internal_only
@show_if(features.SUPER_USERS)
class ChangeLog(ApiResource):
  """ Resource for returning the change log for enterprise customers. """
  @require_fresh_login
  @verify_not_prod
  @nickname('getChangeLog')
  @require_scope(scopes.SUPERUSER)
  def get(self):
    """ Returns the change log for this installation. """
    if SuperUserPermission().can():
      with open('CHANGELOG.md', 'r') as f:
        return {
          'log': f.read()
        }

    abort(403)



@resource('/v1/superuser/organizations/')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserOrganizationList(ApiResource):
  """ Resource for listing organizations in the system. """
  @require_fresh_login
  @verify_not_prod
  @nickname('listAllOrganizations')
  @require_scope(scopes.SUPERUSER)
  def get(self):
    """ Returns a list of all organizations in the system. """
    if SuperUserPermission().can():
      orgs = model.organization.get_organizations()
      return {
        'organizations': [org_view(org) for org in orgs]
      }

    abort(403)


@resource('/v1/superuser/users/')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserList(ApiResource):
  """ Resource for listing users in the system. """
  schemas = {
    'CreateInstallUser': {
      'id': 'CreateInstallUser',
      'description': 'Data for creating a user',
      'required': ['username', 'email'],
      'properties': {
        'username': {
          'type': 'string',
          'description': 'The username of the user being created'
        },

        'email': {
          'type': 'string',
          'description': 'The email address of the user being created'
        }
      }
    }
  }

  @require_fresh_login
  @verify_not_prod
  @nickname('listAllUsers')
  @require_scope(scopes.SUPERUSER)
  def get(self):
    """ Returns a list of all users in the system. """
    if SuperUserPermission().can():
      users = model.user.get_active_users()
      return {
        'users': [user_view(user) for user in users]
      }

    abort(403)


  @require_fresh_login
  @verify_not_prod
  @nickname('createInstallUser')
  @validate_json_request('CreateInstallUser')
  @require_scope(scopes.SUPERUSER)
  def post(self):
    """ Creates a new user. """
    # Ensure that we are using database auth.
    if app.config['AUTHENTICATION_TYPE'] != 'Database':
      abort(400)

    user_information = request.get_json()
    if SuperUserPermission().can():
      username = user_information['username']
      email = user_information['email']

      # Generate a temporary password for the user.
      random = SystemRandom()
      password = ''.join([random.choice(string.ascii_uppercase + string.digits) for _ in range(32)])

      # Create the user.
      user = model.user.create_user(username, password, email, auto_verify=not features.MAILING)

      # If mailing is turned on, send the user a verification email.
      if features.MAILING:
        confirmation = model.user.create_confirm_email_code(user)
        send_confirmation_email(user.username, user.email, confirmation.code)

      return {
        'username': username,
        'email': email,
        'password': password,
        'encrypted_password': authentication.encrypt_user_password(password),
      }

    abort(403)


@resource('/v1/superusers/users/<username>/sendrecovery')
@internal_only
@show_if(features.SUPER_USERS)
@show_if(features.MAILING)
class SuperUserSendRecoveryEmail(ApiResource):
  """ Resource for sending a recovery user on behalf of a user. """
  @require_fresh_login
  @verify_not_prod
  @nickname('sendInstallUserRecoveryEmail')
  @require_scope(scopes.SUPERUSER)
  def post(self, username):
    # Ensure that we are using database auth.
    if app.config['AUTHENTICATION_TYPE'] != 'Database':
      abort(400)

    if SuperUserPermission().can():
      user = model.user.get_nonrobot_user(username)
      if not user:
        abort(404)

      if superusers.is_superuser(username):
        abort(403)

      code = model.user.create_reset_password_email_code(user.email)
      send_recovery_email(user.email, code.code)
      return {
        'email': user.email
      }

    abort(403)


@resource('/v1/superuser/users/<username>')
@path_param('username', 'The username of the user being managed')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserManagement(ApiResource):
  """ Resource for managing users in the system. """
  schemas = {
    'UpdateUser': {
      'id': 'UpdateUser',
      'type': 'object',
      'description': 'Description of updates for a user',
      'properties': {
        'password': {
          'type': 'string',
          'description': 'The new password for the user',
        },
        'email': {
          'type': 'string',
          'description': 'The new e-mail address for the user',
        },
        'enabled': {
          'type': 'boolean',
          'description': 'Whether the user is enabled'
        }
      },
    },
  }

  @require_fresh_login
  @verify_not_prod
  @nickname('getInstallUser')
  @require_scope(scopes.SUPERUSER)
  def get(self, username):
    """ Returns information about the specified user. """
    if SuperUserPermission().can():
      user = model.user.get_nonrobot_user(username)
      if not user:
        abort(404)

      return user_view(user)

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('deleteInstallUser')
  @require_scope(scopes.SUPERUSER)
  def delete(self, username):
    """ Deletes the specified user. """
    if SuperUserPermission().can():
      user = model.user.get_nonrobot_user(username)
      if not user:
        abort(404)

      if superusers.is_superuser(username):
        abort(403)

      model.user.delete_user(user)
      return 'Deleted', 204

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('changeInstallUser')
  @validate_json_request('UpdateUser')
  @require_scope(scopes.SUPERUSER)
  def put(self, username):
    """ Updates information about the specified user. """
    if SuperUserPermission().can():
      user = model.user.get_nonrobot_user(username)
      if not user:
        abort(404)

      if superusers.is_superuser(username):
        abort(403)

      user_data = request.get_json()
      if 'password' in user_data:
        # Ensure that we are using database auth.
        if app.config['AUTHENTICATION_TYPE'] != 'Database':
          abort(400)

        model.user.change_password(user, user_data['password'])

      if 'email' in user_data:
        # Ensure that we are using database auth.
        if app.config['AUTHENTICATION_TYPE'] != 'Database':
          abort(400)

        model.user.update_email(user, user_data['email'], auto_verify=True)

      if 'enabled' in user_data:
        # Disable/enable the user.
        user.enabled = bool(user_data['enabled'])
        user.save()

      if 'superuser' in user_data:
        config_object = config_provider.get_config()
        superusers_set = set(config_object['SUPER_USERS'])

        if user_data['superuser']:
          superusers_set.add(username)
        elif username in superusers_set:
          superusers_set.remove(username)

        config_object['SUPER_USERS'] = list(superusers_set)
        config_provider.save_config(config_object)

      return user_view(user, password=user_data.get('password'))

    abort(403)


@resource('/v1/superuser/organizations/<name>')
@path_param('name', 'The name of the organizaton being managed')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserOrganizationManagement(ApiResource):
  """ Resource for managing organizations in the system. """
  schemas = {
    'UpdateOrg': {
      'id': 'UpdateOrg',
      'type': 'object',
      'description': 'Description of updates for an organization',
      'properties': {
        'name': {
          'type': 'string',
          'description': 'The new name for the organization',
        }
      },
    },
  }

  @require_fresh_login
  @verify_not_prod
  @nickname('deleteOrganization')
  @require_scope(scopes.SUPERUSER)
  def delete(self, name):
    """ Deletes the specified organization. """
    if SuperUserPermission().can():
      org = model.organization.get_organization(name)

      model.user.delete_user(org)
      return 'Deleted', 204

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('changeOrganization')
  @validate_json_request('UpdateOrg')
  @require_scope(scopes.SUPERUSER)
  def put(self, name):
    """ Updates information about the specified user. """
    if SuperUserPermission().can():
      org = model.organization.get_organization(name)
      org_data = request.get_json()

      if 'name' in org_data:
        org = model.user.change_username(org.id, org_data['name'])

      return org_view(org)

    abort(403)