#!/usr/bin/env python
"""Wordnik.com's Swagger generic API client. This client handles the client-
server communication, and is invariant across implementations. Specifics of
the methods and models for each application are generated from the Swagger
templates."""

import sys
import os
import re
import urllib.request, urllib.error, urllib.parse
import http.client
import json
import datetime

from .models import *


class ApiClient:
    """Generic API client for Swagger client library builds"""

    def __init__(self, apiKey=None, apiServer=None):
        if apiKey == None:
            raise Exception('You must pass an apiKey when instantiating the '
                            'APIClient')
        self.apiKey = apiKey
        self.apiServer = apiServer
        self.cookie = None

    def callAPI(self, resourcePath, method, queryParams, postData,
                headerParams=None):

        url = self.apiServer + resourcePath
        headers = {}
        if headerParams:
            for param, value in headerParams.items():
                headers[param] = value

        headers['Content-type'] = 'application/json'
        headers['api_key'] = self.apiKey

        if self.cookie:
            headers['Cookie'] = self.cookie

        data = None

        if method == 'GET':

            if queryParams:
                # Need to remove None values, these should not be sent
                sentQueryParams = {}
                for param, value in queryParams.items():
                    if value != None:
                        sentQueryParams[param] = value
                url = url + '?' + urllib.parse.urlencode(sentQueryParams)

        elif method in ['POST', 'PUT', 'DELETE']:

            if postData:
                headers['Content-type'] = 'application/json'
                data = self.sanitizeForSerialization(postData)
                data = json.dumps(data)

        else:
            raise Exception('Method ' + method + ' is not recognized.')

        if data:
            data = data.encode('utf-8')

        requestParams = MethodRequest(method=method, url=url,
                                       headers=headers, data=data)

        # Make the request
        request = urllib.request.urlopen(requestParams)
        encoding = request.headers.get_content_charset()
        if not encoding:
            encoding = 'iso-8859-1'
        response = request.read().decode(encoding)

        try:
            data = json.loads(response)
        except ValueError:  # PUT requests don't return anything
            data = None

        return data

    def toPathValue(self, obj):
        """Serialize a list to a CSV string, if necessary.
        Args:
            obj -- data object to be serialized
        Returns:
            string -- json serialization of object
        """
        if type(obj) == list:
            return ','.join(obj)
        else:
            return obj

    def sanitizeForSerialization(self, obj):
        """Dump an object into JSON for POSTing."""

        if not obj:
            return None
        elif type(obj) in [str, int, float, bool]:
            return obj
        elif type(obj) == list:
            return [self.sanitizeForSerialization(subObj) for subObj in obj]
        elif type(obj) == datetime.datetime:
            return obj.isoformat()
        else:
            if type(obj) == dict:
                objDict = obj
            else:
                objDict = obj.__dict__
            return {key: self.sanitizeForSerialization(val)
                    for (key, val) in objDict.items()
                    if key != 'swaggerTypes'}

    def deserialize(self, obj, objClass):
        """Derialize a JSON string into an object.

        Args:
            obj -- string or object to be deserialized
            objClass -- class literal for deserialzied object, or string
                of class name
        Returns:
            object -- deserialized object"""

        # Have to accept objClass as string or actual type. Type could be a
        # native Python type, or one of the model classes.
        if type(objClass) == str:
            if 'list[' in objClass:
                match = re.match('list\[(.*)\]', objClass)
                subClass = match.group(1)
                return [self.deserialize(subObj, subClass) for subObj in obj]

            if (objClass in ['int', 'float', 'dict', 'list', 'str']):
                objClass = eval(objClass)
            else:  # not a native type, must be model class
                objClass = eval(objClass + '.' + objClass)

        if objClass in [str, int, float, bool]:
            return objClass(obj)
        elif objClass == datetime:
            # Server will always return a time stamp in UTC, but with
            # trailing +0000 indicating no offset from UTC. So don't process
            # last 5 characters.
            return datetime.datetime.strptime(obj[:-5],
                                              "%Y-%m-%dT%H:%M:%S.%f")

        instance = objClass()

        for attr, attrType in instance.swaggerTypes.items():

            if attr in obj:
                value = obj[attr]
                if attrType in ['str', 'int', 'float', 'bool']:
                    attrType = eval(attrType)
                    try:
                        value = attrType(value)
                    except UnicodeEncodeError:
                        value = unicode(value)
                    setattr(instance, attr, value)
                elif 'list[' in attrType:
                    match = re.match('list\[(.*)\]', attrType)
                    subClass = match.group(1)
                    subValues = []
                    if not value:
                        setattr(instance, attr, None)
                    else:
                        for subValue in value:
                            subValues.append(self.deserialize(subValue,
                                                              subClass))
                    setattr(instance, attr, subValues)
                else:
                    setattr(instance, attr, self.deserialize(value,
                                                             objClass))

        return instance


class MethodRequest(urllib.request.Request):

    def __init__(self, *args, **kwargs):
        """Construct a MethodRequest. Usage is the same as for
        `urllib.Request` except it also takes an optional `method`
        keyword argument. If supplied, `method` will be used instead of
        the default."""

        if 'method' in kwargs:
            self.method = kwargs.pop('method')
        return urllib.request.Request.__init__(self, *args, **kwargs)

    def get_method(self):
        return getattr(self, 'method', urllib.request.Request.get_method(self))