""" Superuser API. """

import logging
import os
import string

from datetime import datetime
from random import SystemRandom

from flask import request, make_response, jsonify

import features

from app import app, avatar, superusers, authentication, config_provider
from auth import scopes
from auth.auth_context import get_authenticated_user
from auth.permissions import SuperUserPermission
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,
                           page_support, log_action)
from endpoints.api.logs import get_logs, get_aggregate_logs
from data import model
from data.database import ServiceKeyApprovalType
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, parsed_args):
    """ Returns the aggregated logs for the current system. """
    if SuperUserPermission().can():
      start_time = parsed_args['starttime']
      end_time = parsed_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)
  @page_support()
  @require_scope(scopes.SUPERUSER)
  def get(self, parsed_args, page_token):
    """ List the usage logs for the current system. """
    if SuperUserPermission().can():
      start_time = parsed_args['starttime']
      end_time = parsed_args['endtime']

      return get_logs(start_time, end_time, page_token=page_token)

    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 = {
    'kind': 'user',
    'name': user.username,
    '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/takeownership/<namespace>')
@path_param('namespace', 'The namespace of the user or organization being managed')
@internal_only
@show_if(features.SUPER_USERS)
class SuperUserTakeOwnership(ApiResource):
  """ Resource for a superuser to take ownership of a namespace. """
  @require_fresh_login
  @verify_not_prod
  @nickname('takeOwnership')
  @require_scope(scopes.SUPERUSER)
  def post(self, namespace):
    """ Takes ownership of the specified organization or user. """
    if SuperUserPermission().can():
      # Disallow for superusers.
      if superusers.is_superuser(namespace):
        abort(400)

      entity = model.user.get_user_or_org(namespace)
      if entity is None:
        abort(404)

      authed_user = get_authenticated_user()
      was_user = not entity.organization
      if entity.organization:
        # Add the superuser as an admin to the owners team of the org.
        model.organization.add_user_as_admin(authed_user, entity)
      else:
        # If the entity is a user, convert it to an organization and add the current superuser
        # as the admin.
        model.organization.convert_user_to_organization(entity, get_authenticated_user())

      # Log the change.
      log_metadata = {
        'entity_id': entity.id,
        'namespace': namespace,
        'was_user': was_user,
        'superuser': authed_user.username,
      }

      log_action('take_ownership', authed_user.username, log_metadata)

      return jsonify({
        'namespace': namespace
      })

    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)


def key_view(key):
  return {
    'name': key.name,
    'kid': key.kid,
    'service': key.service,
    'jwk': key.jwk,
    'metadata': key.metadata,
    'created_date': key.created_date,
    'expiration_date': key.expiration_date,
    'rotation_duration': key.rotation_duration,
    'approval': approval_view(key.approval) if key.approval is not None else None,
  }


def approval_view(approval):
  return {
    'approver': user_view(approval.approver) if approval.approver else None,
    'approval_type': approval.approval_type,
    'approved_date': approval.approved_date,
    'notes': approval.notes,
  }


@resource('/v1/superuser/keys')
@show_if(features.SUPER_USERS)
class SuperUserServiceKeyManagement(ApiResource):
  """ Resource for managing service keys."""
  schemas = {
    'CreateServiceKey': {
      'id': 'CreateServiceKey',
      'type': 'object',
      'description': 'Description of creation of a service key',
      'required': ['service', 'expiration'],
      'properties': {
        'service': {
          'type': 'string',
          'description': 'The service authenticating with this key',
        },
        'name': {
          'type': 'string',
          'description': 'The friendly name of a service key',
        },
        'metadata': {
          'type': 'object',
          'description': 'The key/value pairs of this key\'s metadata',
        },
        'notes': {
          'type': 'string',
          'description': 'If specified, the extra notes for the key',
        },
        'expiration': {
          'description': 'The expiration date as a unix timestamp',
          'anyOf': [{'type': 'number'}, {'type': 'null'}],
        },
      },
    },
  }

  @verify_not_prod
  @nickname('listServiceKeys')
  @require_scope(scopes.SUPERUSER)
  def get(self):
    if SuperUserPermission().can():
      keys = model.service_keys.list_all_keys()

      return jsonify({
        'keys': [key_view(key) for key in keys],
      })

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('createServiceKey')
  @require_scope(scopes.SUPERUSER)
  @validate_json_request('CreateServiceKey')
  def post(self):
    if SuperUserPermission().can():
      body = request.get_json()

      # Ensure we have a valid expiration date if specified.
      expiration_date = body.get('expiration', None)
      if expiration_date is not None:
        try:
          expiration_date = datetime.utcfromtimestamp(float(expiration_date))
        except ValueError:
          abort(400)

        if expiration_date <= datetime.now():
          abort(400)

      # Create the metadata for the key.
      user = get_authenticated_user()
      metadata = body.get('metadata', {})
      metadata.update({
        'created_by': 'Quay Superuser Panel',
        'creator': user.username,
        'ip': request.remote_addr,
      })

      # Generate a key with a private key that we *never save*.
      (private_key, key) = model.service_keys.generate_service_key(body['service'], expiration_date,
                                                                   metadata=metadata,
                                                                   name=body.get('name', ''))
      # Auto-approve the service key.
      model.service_keys.approve_service_key(key.kid, user, ServiceKeyApprovalType.SUPERUSER,
                                             notes=body.get('notes', ''))

      # Log the creation and auto-approval of the service key.
      key_log_metadata = {
        'kid': key.kid,
        'preshared': True,
        'service': body['service'],
        'name': body.get('name', ''),
        'expiration_date': expiration_date,
        'auto_approved': True,
      }

      log_action('service_key_create', None, key_log_metadata)
      log_action('service_key_approve', None, key_log_metadata)

      return jsonify({
        'kid': key.kid,
        'name': body.get('name', ''),
        'service': body['service'],
        'public_key': private_key.publickey().exportKey('PEM'),
        'private_key': private_key.exportKey('PEM'),
      })

    abort(403)


@resource('/v1/superuser/keys/<kid>')
@path_param('kid', 'The unique identifier for a service key')
@show_if(features.SUPER_USERS)
class SuperUserServiceKey(ApiResource):
  """ Resource for managing service keys. """
  schemas = {
    'PutServiceKey': {
      'id': 'PutServiceKey',
      'type': 'object',
      'description': 'Description of updates for a service key',
      'properties': {
        'name': {
          'type': 'string',
          'description': 'The friendly name of a service key',
        },
        'metadata': {
          'type': 'object',
          'description': 'The key/value pairs of this key\'s metadata',
        },
        'expiration': {
          'description': 'The expiration date as a unix timestamp',
          'anyOf': [{'type': 'number'}, {'type': 'null'}],
        },
      },
    },
  }

  @verify_not_prod
  @nickname('getServiceKey')
  @require_scope(scopes.SUPERUSER)
  def get(self, kid):
    if SuperUserPermission().can():
      try:
        key = model.service_keys.get_service_key(kid, approved_only=False, alive_only=False)
        return jsonify(key_view(key))
      except model.service_keys.ServiceKeyDoesNotExist:
        abort(404)

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('updateServiceKey')
  @require_scope(scopes.SUPERUSER)
  @validate_json_request('PutServiceKey')
  def put(self, kid):
    if SuperUserPermission().can():
      body = request.get_json()
      try:
        key = model.service_keys.get_service_key(kid, approved_only=False, alive_only=False)
      except model.service_keys.ServiceKeyDoesNotExist:
        abort(404)

      key_log_metadata = {
        'kid': key.kid,
        'service': key.service,
        'name': body.get('name', key.name),
        'expiration_date': key.expiration_date,
      }

      if 'expiration' in body:
        expiration_date = body['expiration']
        if expiration_date is not None and expiration_date != '':
          try:
            expiration_date = datetime.utcfromtimestamp(float(expiration_date))
          except ValueError:
            abort(400)

          if expiration_date <= datetime.now():
            abort(400)

        key_log_metadata.update({
          'old_expiration_date': key.expiration_date,
          'expiration_date': expiration_date,
        })

        log_action('service_key_extend', None, key_log_metadata)
        model.service_keys.set_key_expiration(kid, expiration_date)


      if 'name' in body or 'metadata' in body:
        model.service_keys.update_service_key(kid, body.get('name'), body.get('metadata'))
        log_action('service_key_modify', None, key_log_metadata)

      updated_key = model.service_keys.get_service_key(kid, approved_only=False, alive_only=False)
      return jsonify(key_view(updated_key))

    abort(403)

  @require_fresh_login
  @verify_not_prod
  @nickname('deleteServiceKey')
  @require_scope(scopes.SUPERUSER)
  def delete(self, kid):
    if SuperUserPermission().can():
      try:
        key = model.service_keys.delete_service_key(kid)
      except model.service_keys.ServiceKeyDoesNotExist:
        abort(404)

      key_log_metadata = {
        'kid': kid,
        'service': key.service,
        'name': key.name,
        'created_date': key.created_date,
        'expiration_date': key.expiration_date,
      }

      log_action('service_key_delete', None, key_log_metadata)
      return make_response('', 204)

    abort(403)


@resource('/v1/superuser/approvedkeys/<kid>')
@path_param('kid', 'The unique identifier for a service key')
@show_if(features.SUPER_USERS)
class SuperUserServiceKeyApproval(ApiResource):
  """ Resource for approving service keys. """

  schemas = {
    'ApproveServiceKey': {
      'id': 'ApproveServiceKey',
      'type': 'object',
      'description': 'Information for approving service keys',
      'properties': {
        'notes': {
          'type': 'string',
          'description': 'Optional approval notes',
        },
      },
    },
  }

  @require_fresh_login
  @verify_not_prod
  @nickname('approveServiceKey')
  @require_scope(scopes.SUPERUSER)
  @validate_json_request('ApproveServiceKey')
  def post(self, kid):
    if SuperUserPermission().can():
      notes = request.get_json().get('notes', '')
      approver = get_authenticated_user()
      try:
        key = model.service_keys.approve_service_key(kid, approver, ServiceKeyApprovalType.SUPERUSER,
                                                     notes=notes)

        # Log the approval of the service key.
        key_log_metadata = {
          'kid': kid,
          'service': key.service,
          'name': key.name,
          'expiration_date': key.expiration_date,
        }

        log_action('service_key_approve', None, key_log_metadata)
      except model.ServiceKeyDoesNotExist:
        abort(404)
      except model.ServiceKeyAlreadyApproved:
        pass

      return make_response('', 201)

    abort(403)