import logging
import pathvalidate
import os
import subprocess

from flask import request, jsonify, make_response

from endpoints.exception import NotFound
from data.database import ServiceKeyApprovalType
from data.model import ServiceKeyDoesNotExist
from util.config.validator import EXTRA_CA_DIRECTORY

from config_app.config_endpoints.exception import InvalidRequest
from config_app.config_endpoints.api import resource, ApiResource, nickname, log_action, validate_json_request
from config_app.config_endpoints.api.superuser_models_pre_oci import pre_oci_model
from config_app.config_util.ssl import load_certificate, CertInvalidException
from config_app.c_app import app, config_provider, INIT_SCRIPTS_LOCATION


logger = logging.getLogger(__name__)


@resource('/v1/superuser/customcerts/<certpath>')
class SuperUserCustomCertificate(ApiResource):
    """ Resource for managing a custom certificate. """

    @nickname('uploadCustomCertificate')
    def post(self, certpath):
        uploaded_file = request.files['file']
        if not uploaded_file:
            raise InvalidRequest('Missing certificate file')

        # Save the certificate.
        certpath = pathvalidate.sanitize_filename(certpath)
        if not certpath.endswith('.crt'):
            raise InvalidRequest('Invalid certificate file: must have suffix `.crt`')

        logger.debug('Saving custom certificate %s', certpath)
        cert_full_path = config_provider.get_volume_path(EXTRA_CA_DIRECTORY, certpath)
        config_provider.save_volume_file(cert_full_path, uploaded_file)
        logger.debug('Saved custom certificate %s', certpath)

        # Validate the certificate.
        try:
            logger.debug('Loading custom certificate %s', certpath)
            with config_provider.get_volume_file(cert_full_path) as f:
                load_certificate(f.read())
        except CertInvalidException:
            logger.exception('Got certificate invalid error for cert %s', certpath)
            return '', 204
        except IOError:
            logger.exception('Got IO error for cert %s', certpath)
            return '', 204

        # Call the update script with config dir location to install the certificate immediately.
        if subprocess.call([os.path.join(INIT_SCRIPTS_LOCATION, 'certs_install.sh')],
                           env={ 'QUAYCONFIG': config_provider.get_config_dir_path() }) != 0:
            raise Exception('Could not install certificates')

        return '', 204

    @nickname('deleteCustomCertificate')
    def delete(self, certpath):
        cert_full_path = config_provider.get_volume_path(EXTRA_CA_DIRECTORY, certpath)
        config_provider.remove_volume_file(cert_full_path)
        return '', 204


@resource('/v1/superuser/customcerts')
class SuperUserCustomCertificates(ApiResource):
    """ Resource for managing custom certificates. """

    @nickname('getCustomCertificates')
    def get(self):
        has_extra_certs_path = config_provider.volume_file_exists(EXTRA_CA_DIRECTORY)
        extra_certs_found = config_provider.list_volume_directory(EXTRA_CA_DIRECTORY)
        if extra_certs_found is None:
            return {
                'status': 'file' if has_extra_certs_path else 'none',
            }

        cert_views = []
        for extra_cert_path in extra_certs_found:
            try:
                cert_full_path = config_provider.get_volume_path(EXTRA_CA_DIRECTORY, extra_cert_path)
                with config_provider.get_volume_file(cert_full_path) as f:
                    certificate = load_certificate(f.read())
                    cert_views.append({
                        'path': extra_cert_path,
                        'names': list(certificate.names),
                        'expired': certificate.expired,
                    })
            except CertInvalidException as cie:
                cert_views.append({
                    'path': extra_cert_path,
                    'error': cie.message,
                })
            except IOError as ioe:
                cert_views.append({
                    'path': extra_cert_path,
                    'error': ioe.message,
                })

        return {
            'status': 'directory',
            'certs': cert_views,
        }


@resource('/v1/superuser/keys')
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'}],
                },
            },
        },
    }

    @nickname('listServiceKeys')
    def get(self):
        keys = pre_oci_model.list_all_service_keys()

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

@resource('/v1/superuser/approvedkeys/<kid>')
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',
                },
            },
        },
    }

    @nickname('approveServiceKey')
    @validate_json_request('ApproveServiceKey')
    def post(self, kid):
        notes = request.get_json().get('notes', '')
        try:
            key = pre_oci_model.approve_service_key(kid, 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,
            }

            # Note: this may not actually be the current person modifying the config, but if they're in the config tool,
            # they have full access to the DB and could pretend to be any user, so pulling any superuser is likely fine
            super_user = app.config.get('SUPER_USERS', [None])[0]
            log_action('service_key_approve', super_user, key_log_metadata)
        except ServiceKeyDoesNotExist:
            raise NotFound()
        except ServiceKeyAlreadyApproved:
            pass

        return make_response('', 201)