# -*- coding: utf-8 -*-

################################################################
# xmldirector.connector
# (C) 2019,  Andreas Jung, www.zopyx.com, Tuebingen, Germany
################################################################

import fs
import fs.errors
from fs.opener import registry as fs_opener_registry
import furl

from zope import schema
from zope.interface import implementer
from zope.component import getUtility
from plone.dexterity.content import Item
from plone.supermodel import model
from plone.registry.interfaces import IRegistry

from xmldirector.connector.i18n import MessageFactory as _
from xmldirector.connector.interfaces import IConnectorSettings
from xmldirector.connector.logger import LOG

# determine all entry points
SUPPORTED_FS_SCHEMAS = fs_opener_registry.protocols
LOG.info('Supported fs protocols: {}'.format(SUPPORTED_FS_SCHEMAS))


class IConnector(model.Schema):

    connector_url = schema.TextLine(
        title=_(u'(optional) connection URL of storage'),
        description=_(
            u'WebDAV: webdav://host:port/path/to/webdav, '
            'local filesystem: file://path/to/directory, '
            'AWS S3: s3://bucketname, ', 'SFTP sftp://host/path'),
        required=False)

    connector_username = schema.TextLine(title=_(u'(optional) username overriding the system settings'), required=False)

    connector_password = schema.Password(title=_(u'(optional) password overriding the system settings'), required=False)

    connector_subpath = schema.TextLine(
        title=_(u'Subdirectory relative to the global connection URL'),
        description=_(u'Use this value for configuring a more specific subpath'),
        required=False)

    connector_readonly = schema.Bool(title=_(u'Readonly access'), default=False, required=False)


@implementer(IConnector)
class Connector(Item):

    def get_connector_url(self, subpath=None, hide_password=False):

        url = ''
        username = ''
        password = ''

        # check local connector URL first
        connector_url = getattr(self, 'connector_url', None)
        if connector_url:
            url = connector_url
            username = self.connector_username
            password = self.connector_password
        else:
            # global URL settings
            registry = getUtility(IRegistry)
            settings = registry.forInterface(IConnectorSettings)
            url = settings.connector_url
            username = settings.connector_username
            password = settings.connector_password

        username = username or ''
        password = password or ''
        if not url:
            raise ValueError('No connector URL configured (neither local nor global)')

        f = furl.furl(url)
        if username:
            f.username = username
        if password:
            f.password = 'secret' if hide_password else password
        if self.connector_subpath:
            f.path.add(self.connector_subpath)
        if subpath:
            f.path.add(subpath)

        if f.scheme not in SUPPORTED_FS_SCHEMAS:
            LOG.warning('Unsupported scheme: {}'.format(f.scheme))
        return f.tostr()

    def get_handle(self, subpath=None):

        def escaped_url(url):
            """ Remove credentials from url """
            f = furl.furl(url)
            f.username = None
            f.password = None
            return f.tostr()

        url = self.get_connector_url(subpath)
        try:
            return fs.open_fs(url)
        except fs.errors.CreateFailed as e:
            url2 = escaped_url(url)
            raise IOError('Unable to open fs {0} ({1}'.format(url2, e))

