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# Tweepy
# Copyright 2009-2010 Joshua Roesslein
# See LICENSE for details.

from __future__ import print_function

from tweepy.models import ModelFactory
from tweepy.utils import import_simplejson
from tweepy.error import TweepError


class Parser(object):

    def parse(self, method, payload):
        """
        Parse the response payload and return the result.
        Returns a tuple that contains the result data and the cursors
        (or None if not present).
        """
        raise NotImplementedError

    def parse_error(self, payload):
        """
        Parse the error message and api error code from payload.
        Return them as an (error_msg, error_code) tuple. If unable to parse the
        message, throw an exception and default error message will be used.
        """
        raise NotImplementedError


class RawParser(Parser):

    def __init__(self):
        pass

    def parse(self, method, payload):
        return payload

    def parse_error(self, payload):
        return payload


class JSONParser(Parser):

    payload_format = 'json'

    def __init__(self):
        self.json_lib = import_simplejson()

    def parse(self, method, payload):
        try:
            json = self.json_lib.loads(payload)
        except Exception as e:
            raise TweepError('Failed to parse JSON payload: %s' % e)

        needs_cursors = 'cursor' in method.session.params
        if needs_cursors and isinstance(json, dict):
            if 'previous_cursor' in json:
                if 'next_cursor' in json:
                    cursors = json['previous_cursor'], json['next_cursor']
                    return json, cursors
        else:
            return json

    def parse_error(self, payload):
        error_object = self.json_lib.loads(payload)

        if 'error' in error_object:
            reason = error_object['error']
            api_code = error_object.get('code')
        else:
            reason = error_object['errors']
            api_code = [error.get('code') for error in
                        reason if error.get('code')]
            api_code = api_code[0] if len(api_code) == 1 else api_code

        return reason, api_code


class ModelParser(JSONParser):

    def __init__(self, model_factory=None):
        JSONParser.__init__(self)
        self.model_factory = model_factory or ModelFactory

    def parse(self, method, payload):
        try:
            if method.payload_type is None:
                return
            model = getattr(self.model_factory, method.payload_type)
        except AttributeError:
            raise TweepError('No model for this payload type: '
                             '%s' % method.payload_type)

        json = JSONParser.parse(self, method, payload)
        if isinstance(json, tuple):
            json, cursors = json
        else:
            cursors = None

        if method.payload_list:
            result = model.parse_list(method.api, json)
        else:
            result = model.parse(method.api, json)

        if cursors:
            return result, cursors
        else:
            return result