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# Copyright 2011-2012 GRNET S.A. All rights reserved.

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# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, self.list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, self.list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

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from urllib2 import quote

from threading import Thread

from json import dumps, loads

from time import time

import logging

from kamaki.clients.connection.kamakicon import KamakiHTTPConnection

from kamaki.clients.connection.errors import HTTPConnectionError

from kamaki.clients.connection.errors import HTTPResponseError

sendlog = logging.getLogger('clients.send')

datasendlog = logging.getLogger('data.send')

recvlog = logging.getLogger('clients.recv')

datarecvlog = logging.getLogger('data.recv')

class ClientError(Exception):

    def __init__(self, message, status=0, details=None):

        try:

            message += '' if message and message[-1] == '\n' else '\n'

            serv_stat, sep, new_msg = message.partition('{')

            new_msg = sep + new_msg

            json_msg = loads(new_msg)

            key = json_msg.keys()[0]

            json_msg = json_msg[key]

            message = '%s %s (%s)\n' % (serv_stat, key, json_msg['message'])\

                if 'message' in json_msg else '%s %s' % (serv_stat, key)

            if 'code' in json_msg:

                status = json_msg['code']

            if 'details' in json_msg:

                if not details:

                    details = []

                elif not isinstance(details, list):

                    details = [details]

                if json_msg['details']:

                    details.append(json_msg['details'])

        except:

            pass

        super(ClientError, self).__init__(message)

        self.status = status

        self.details = details if details else []

class SilentEvent(Thread):

    """ Thread-run method(*args, **kwargs)

        put exception in exception_bucket

    """

    def __init__(self, method, *args, **kwargs):

        super(self.__class__, self).__init__()

        self.method = method

        self.args = args

        self.kwargs = kwargs

    @property

    def exception(self):

        return getattr(self, '_exception', False)

    @property

    def value(self):

        return getattr(self, '_value', None)

    def run(self):

        try:

            self._value = self.method(*(self.args), **(self.kwargs))

        except Exception as e:

            recvlog.debug('Thread %s got exception %s\n<%s %s' % (

                self,

                type(e),

                e.status if isinstance(e, ClientError) else '',

                e))

            self._exception = e

class Client(object):

    POOL_SIZE = 7

    def __init__(self, base_url, token, http_client=KamakiHTTPConnection()):

        self.base_url = base_url

        self.token = token

        self.headers = {}

        self.DATE_FORMATS = [

            '%a %b %d %H:%M:%S %Y',

            '%A, %d-%b-%y %H:%M:%S GMT',

            '%a, %d %b %Y %H:%M:%S GMT']

        self.http_client = http_client

    def _init_thread_limit(self, limit=1):

        self._thread_limit = limit

        self._elapsed_old = 0.0

        self._elapsed_new = 0.0

    def _watch_thread_limit(self, threadlist):

        recvlog.debug('# running threads: %s' % len(threadlist))

        if (self._elapsed_old > self._elapsed_new) and (

                self._thread_limit < self.POOL_SIZE):

            self._thread_limit += 1

        elif self._elapsed_old < self._elapsed_new and self._thread_limit > 1:

            self._thread_limit -= 1

        self._elapsed_old = self._elapsed_new

        if len(threadlist) >= self._thread_limit:

            self._elapsed_new = 0.0

            for thread in threadlist:

                begin_time = time()

                thread.join()

                self._elapsed_new += time() - begin_time

            self._elapsed_new = self._elapsed_new / len(threadlist)

            return []

        return threadlist

    def _raise_for_status(self, r):

        status_msg = getattr(r, 'status', '')

        try:

            message = '%s %s\n' % (status_msg, r.text)

        except:

            message = '%s %s\n' % (status_msg, r)

        status = getattr(r, 'status_code', getattr(r, 'status', 0))

        raise ClientError(message, status=status)

    def set_header(self, name, value, iff=True):

        """Set a header 'name':'value'"""

        if value is not None and iff:

            self.http_client.set_header(name, value)

    def set_param(self, name, value=None, iff=True):

        if iff:

            self.http_client.set_param(name, value)

    def set_default_header(self, name, value):

        self.http_client.headers.setdefault(name, value)

    def request(

            self,

            method,

            path,

            async_headers={},

            async_params={},

            **kwargs):

        """In threaded/asynchronous requests, headers and params are not safe

        Therefore, the standard self.set_header/param system can be used only

        for headers and params that are common for all requests. All other

        params and headers should passes as

        @param async_headers

        @async_params

        E.g. in most queries the 'X-Auth-Token' header might be the same for

        all, but the 'Range' header might be different from request to request.

        """

        try:

            success = kwargs.pop('success', 200)

            data = kwargs.pop('data', None)

            self.set_default_header('X-Auth-Token', self.token)

            if 'json' in kwargs:

                data = dumps(kwargs.pop('json'))

                self.set_default_header('Content-Type', 'application/json')

            if data:

                self.set_default_header('Content-Length', '%s' % len(data))

            sendlog.info('perform a %s @ %s', method, self.base_url)

            self.http_client.url = self.base_url + (

                '/' if (self.base_url and self.base_url[-1]) != '/' else '')

            self.http_client.path = quote(path.encode('utf8'))

            r = self.http_client.perform_request(

                method,

                data,

                async_headers,

                async_params)

            req = self.http_client

            sendlog.info('%s %s', method, req.url)

            headers = dict(req.headers)

            headers.update(async_headers)

            for key, val in headers.items():

                sendlog.info('\t%s: %s', key, val)

            sendlog.info('')

            if data:

                datasendlog.info(data)

            recvlog.info('%d %s', r.status_code, r.status)

            for key, val in r.headers.items():

                recvlog.info('%s: %s', key, val)

            if r.content:

                datarecvlog.info(r.content)

        except (HTTPResponseError, HTTPConnectionError) as err:

            from traceback import format_stack

            recvlog.debug('\n'.join(['%s' % type(err)] + format_stack()))

            self.http_client.reset_headers()

            self.http_client.reset_params()

            errstr = '%s' % err

            if not errstr:

                errstr = ('%s' % type(err))[7:-2]

            status = getattr(err, 'status', getattr(err, 'errno', 0))

            raise ClientError('%s\n' % errstr, status=status)

        self.http_client.reset_headers()

        self.http_client.reset_params()

        if success is not None:

            # Success can either be an in or a collection

            success = (success,) if isinstance(success, int) else success

            if r.status_code not in success:

                r.release()

                self._raise_for_status(r)

        return r

    def delete(self, path, **kwargs):

        return self.request('delete', path, **kwargs)

    def get(self, path, **kwargs):

        return self.request('get', path, **kwargs)

    def head(self, path, **kwargs):

        return self.request('head', path, **kwargs)

    def post(self, path, **kwargs):

        return self.request('post', path, **kwargs)

    def put(self, path, **kwargs):

        return self.request('put', path, **kwargs)

    def copy(self, path, **kwargs):

        return self.request('copy', path, **kwargs)

    def move(self, path, **kwargs):

        return self.request('move', path, **kwargs)