import string
import logging
import json
import os

from random import SystemRandom
from app import app, avatar, superusers
from flask import request

from endpoints.api import (ApiResource, nickname, resource, validate_json_request, request_error,
                           log_action, internal_only, NotFound, require_user_admin, format_date,
                           InvalidToken, require_scope, format_date, hide_if, show_if, parse_args,
                           query_param, abort, require_fresh_login, path_param, verify_not_prod)

from endpoints.api.logs import get_logs

from data import model
from auth.permissions import SuperUserPermission
from auth.auth_context import get_authenticated_user
from util.useremails import send_confirmation_email, send_recovery_email

import features

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')
  def get(self, service):
    """ Returns the logs for the specific service. """
    if SuperUserPermission().can():
      if not service in get_services():
        abort(404)

      try:
        with open(app.config['SYSTEM_SERVICE_LOGS_PATH'] % service, 'r') as f:
          logs = f.read()
      except Exception as ex:
        logger.exception('Cannot read logs')
        abort(400)

      return {
        'logs': 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')
  def get(self):
    """ List the system logs for the current system. """
    if SuperUserPermission().can():
      return {
        'services': list(get_services())
      }

    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('performer', 'Username for which to filter logs.', type=str)
  def get(self, args):
    """ List the usage logs for the current system. """
    if SuperUserPermission().can():
      performer_name = args['performer']
      start_time = args['starttime']
      end_time = args['endtime']

      return get_logs(start_time, end_time)

    abort(403)


def user_view(user):
  return  {
    'username': user.username,
    'email': user.email,
    'verified': user.verified,
    'avatar': avatar.compute_hash(user.email, name=user.username),
    'super_user': superusers.is_superuser(user.username)
  }

@resource('/v1/superuser/usage/')
@internal_only
@show_if(features.SUPER_USERS)
class UsageInformation(ApiResource):
  """ Resource for returning the usage information for enterprise customers. """
  @require_fresh_login
  @verify_not_prod
  @nickname('getSystemUsage')
  def get(self):
    """ Returns the number of repository handles currently held. """
    if SuperUserPermission().can():
      return {
        'usage': model.get_repository_usage(),
        'allowed': app.config.get('MAXIMUM_REPOSITORY_USAGE', 20)
      }

    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')
  def get(self):
    """ Returns a list of all users in the system. """
    if SuperUserPermission().can():
      users = model.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')
  def post(self):
    """ Creates a new user. """
    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.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.create_confirm_email_code(user)
        send_confirmation_email(user.username, user.email, confirmation.code)

      return {
        'username': username,
        'email': email,
        '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')
  def post(self, username):
    if SuperUserPermission().can():
      user = model.get_user(username)
      if not user or user.organization or user.robot:
        abort(404)

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

      code = model.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',
        }
      },
    },
  }

  @require_fresh_login
  @verify_not_prod
  @nickname('getInstallUser')
  def get(self, username):
    """ Returns information about the specified user. """
    if SuperUserPermission().can():
      user = model.get_user(username)
      if not user or user.organization or user.robot:
        abort(404)

      return user_view(user)

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('deleteInstallUser')
  def delete(self, username):
    """ Deletes the specified user. """
    if SuperUserPermission().can():
      user = model.get_user(username)
      if not user or user.organization or user.robot:
        abort(404)

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

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

    abort(403)

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

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

        user_data = request.get_json()
        if 'password' in user_data:
          model.change_password(user, user_data['password'])

        if 'email' in user_data:
          model.update_email(user, user_data['email'])

        return user_view(user)

    abort(403)