import pyactiveresource.connection
from pyactiveresource.activeresource import ActiveResource, ResourceMeta, formats
import shopify.yamlobjects
import shopify.mixins as mixins
import shopify
import threading
import sys
from six.moves import urllib
import six

from shopify.collection import PaginatedCollection
from pyactiveresource.collection import Collection

# Store the response from the last request in the connection object
class ShopifyConnection(pyactiveresource.connection.Connection):
    response = None

    def __init__(self, site, user=None, password=None, timeout=None,
                 format=formats.JSONFormat):
        super(ShopifyConnection, self).__init__(site, user, password, timeout, format)

    def _open(self, *args, **kwargs):
        self.response = None
        try:
            self.response = super(ShopifyConnection, self)._open(*args, **kwargs)
        except pyactiveresource.connection.ConnectionError as err:
            self.response = err.response
            raise
        return self.response

# Inherit from pyactiveresource's metaclass in order to use ShopifyConnection
class ShopifyResourceMeta(ResourceMeta):

    @property
    def connection(cls):
        """HTTP connection for the current thread"""
        local = cls._threadlocal
        if not getattr(local, 'connection', None):
            # Make sure these variables are no longer affected by other threads.
            local.user = cls.user
            local.password = cls.password
            local.site = cls.site
            local.timeout = cls.timeout
            local.headers = cls.headers
            local.format = cls.format
            local.version = cls.version
            local.url = cls.url
            if cls.site is None:
                raise ValueError("No shopify session is active")
            local.connection = ShopifyConnection(
                cls.site, cls.user, cls.password, cls.timeout, cls.format)
        return local.connection

    def get_user(cls):
        return getattr(cls._threadlocal, 'user', ShopifyResource._user)

    def set_user(cls, value):
        cls._threadlocal.connection = None
        ShopifyResource._user = cls._threadlocal.user = value

    user = property(get_user, set_user, None,
                    "The username for HTTP Basic Auth.")

    def get_password(cls):
        return getattr(cls._threadlocal, 'password', ShopifyResource._password)

    def set_password(cls, value):
        cls._threadlocal.connection = None
        ShopifyResource._password = cls._threadlocal.password = value

    password = property(get_password, set_password, None,
                        "The password for HTTP Basic Auth.")

    def get_site(cls):
        return getattr(cls._threadlocal, 'site', ShopifyResource._site)

    def set_site(cls, value):
        cls._threadlocal.connection = None
        ShopifyResource._site = cls._threadlocal.site = value
        if value is not None:
            parts = urllib.parse.urlparse(value)
            host = parts.hostname
            if parts.port:
                host += ":" + str(parts.port)
            new_site = urllib.parse.urlunparse((parts.scheme, host, parts.path, '', '', ''))
            ShopifyResource._site = cls._threadlocal.site = new_site
            if parts.username:
                cls.user = urllib.parse.unquote(parts.username)
            if parts.password:
                cls.password = urllib.parse.unquote(parts.password)

    site = property(get_site, set_site, None,
                    'The base REST site to connect to.')

    def get_timeout(cls):
        return getattr(cls._threadlocal, 'timeout', ShopifyResource._timeout)

    def set_timeout(cls, value):
        cls._threadlocal.connection = None
        ShopifyResource._timeout = cls._threadlocal.timeout = value

    timeout = property(get_timeout, set_timeout, None,
                       'Socket timeout for HTTP requests')

    def get_headers(cls):
        if not hasattr(cls._threadlocal, 'headers'):
            cls._threadlocal.headers = ShopifyResource._headers.copy()
        return cls._threadlocal.headers

    def set_headers(cls, value):
        cls._threadlocal.headers = value

    headers = property(get_headers, set_headers, None,
                       'The headers sent with HTTP requests')

    def get_format(cls):
        return getattr(cls._threadlocal, 'format', ShopifyResource._format)

    def set_format(cls, value):
        cls._threadlocal.connection = None
        ShopifyResource._format = cls._threadlocal.format = value

    format = property(get_format, set_format, None,
                      'Encoding used for request and responses')

    def get_prefix_source(cls):
        """Return the prefix source, by default derived from site."""
        try:
            return cls.override_prefix()
        except AttributeError:
            if hasattr(cls, '_prefix_source'):
                return cls.site + cls._prefix_source
            else:
                return cls.site

    def set_prefix_source(cls, value):
        """Set the prefix source, which will be rendered into the prefix."""
        cls._prefix_source = value

    prefix_source = property(get_prefix_source, set_prefix_source, None,
                             'prefix for lookups for this type of object.')
    def get_version(cls):
        return getattr(cls._threadlocal, 'version', ShopifyResource._version)

    def set_version(cls, value):
        ShopifyResource._version = cls._threadlocal.version = value

    version = property(get_version, set_version, None,
                      'Shopify Api Version')

    def get_version(cls):
        return getattr(cls._threadlocal, 'version', ShopifyResource._version)

    def set_version(cls, value):
        ShopifyResource._version = cls._threadlocal.version = value

    version = property(get_version, set_version, None,
                      'Shopify Api Version')

    def get_url(cls):
        return getattr(cls._threadlocal, 'url', ShopifyResource._url)

    def set_url(cls, value):
        ShopifyResource._url = cls._threadlocal.url = value

    url = property(get_url, set_url, None,
                      'Base URL including protocol and shopify domain')


@six.add_metaclass(ShopifyResourceMeta)
class ShopifyResource(ActiveResource, mixins.Countable):
    _format = formats.JSONFormat
    _threadlocal = threading.local()
    _headers = {'User-Agent': 'ShopifyPythonAPI/%s Python/%s' % (shopify.VERSION, sys.version.split(' ', 1)[0])}
    _version = None
    _url = None

    def __init__(self, attributes=None, prefix_options=None):
        if attributes is not None and prefix_options is None:
            prefix_options, attributes = self.__class__._split_options(attributes)
        return super(ShopifyResource, self).__init__(attributes, prefix_options)

    def is_new(self):
        return not self.id

    def _load_attributes_from_response(self, response):
        if response.body.strip():
            self._update(self.__class__.format.decode(response.body))

    @classmethod
    def activate_session(cls, session):
        cls.site = session.site
        cls.url = session.url
        cls.user = None
        cls.password = None
        cls.version = session.api_version.name
        cls.headers['X-Shopify-Access-Token'] = session.token

    @classmethod
    def clear_session(cls):
        cls.site = None
        cls.url = None
        cls.user = None
        cls.password = None
        cls.version = None
        cls.headers.pop('X-Shopify-Access-Token', None)

    @classmethod
    def find(cls, id_=None, from_=None, **kwargs):
        """Checks the resulting collection for pagination metadata."""
        collection = super(ShopifyResource, cls).find(id_=id_, from_=from_, **kwargs)
        if isinstance(collection, Collection) and "headers" in collection.metadata:
            return PaginatedCollection(collection, metadata={"resource_class": cls}, **kwargs)
        return collection