import boto3
import botocore.session
from botocore.exceptions import ClientError
from botocore.exceptions import ParamValidationError
from nose.tools import eq_ as eq
from nose.plugins.attrib import attr
from nose.plugins.skip import SkipTest
import isodate
import email.utils
import datetime
import threading
import re
import pytz
from collections import OrderedDict
import requests
import json
import base64
import hmac
import hashlib
import xml.etree.ElementTree as ET
import time
import operator
import nose
import os
import string
import random
import socket
import ssl
from email.header import decode_header

from .utils import assert_raises
from .utils import generate_random
from .utils import _get_status_and_error_code
from .utils import _get_status

from .policy import Policy, Statement, make_json_policy

from . import (
    get_client,
    get_prefix,
    get_unauthenticated_client,
    get_bad_auth_client,
    get_v2_client,
    get_new_bucket,
    get_new_bucket_name,
    get_new_bucket_resource,
    get_config_is_secure,
    get_config_host,
    get_config_port,
    get_config_endpoint,
    get_main_aws_access_key,
    get_main_aws_secret_key,
    get_main_display_name,
    get_main_user_id,
    get_main_email,
    get_main_api_name,
    get_alt_aws_access_key,
    get_alt_aws_secret_key,
    get_alt_display_name,
    get_alt_user_id,
    get_alt_email,
    get_alt_client,
    get_tenant_client,
    get_tenant_iam_client,
    get_tenant_user_id,
    get_buckets_list,
    get_objects_list,
    get_main_kms_keyid,
    get_secondary_kms_keyid,
    nuke_prefixed_buckets,
    )

import boto
import boto.s3.connection
import sys
import random
from botocore.client import Config

endpoint = 'http://localhost:8000'
access_key = 'b2345678901234567890'
secret_key = 'b234567890123456789012345678901234567890'
region_name = ''

def get_connection():
    conn = boto.connect_s3(
        aws_access_key_id = access_key,
        aws_secret_access_key = secret_key,
        host = 'localhost', port = 8000 ,
        is_secure=False,               # uncomment if you are not using ssl
        calling_format = boto.s3.connection.OrdinaryCallingFormat(),
        )

    return conn


def create_random_csv_object(rows,columns):
        result = ""
        for i in range(rows):
            row = "";
            for y in range(columns):
                row = row + "{},".format(random.randint(0,1000)); 
            result += row + "\n"

        return result

def upload_csv_object(bucket_name,new_key,obj):
        conn = get_connection()
        conn.create_bucket( bucket_name )
        bucket = conn.get_bucket( bucket_name )

        k1 = bucket.new_key( new_key );
        k1.set_contents_from_string( obj );
        
    
def run_s3select(bucket,key,query):
    s3 = boto3.client('s3',#'sns',
        endpoint_url=endpoint,
        aws_access_key_id=access_key,
        region_name=region_name,
        aws_secret_access_key=secret_key)
        #config=Config(signature_version='v2'))


    r = s3.select_object_content(
        Bucket=bucket,
        Key=key,
        ExpressionType='SQL',
        InputSerialization = {"CSV": {}, "CompressionType": "NONE"},
        OutputSerialization = {"CSV": {}},
        Expression=query,)
    
    result = ""
    for event in r['Payload']:
        if 'Records' in event:
            records = event['Records']['Payload'].decode('utf-8')
            result += records
    
    return result

def remove_xml_tags_from_result(obj):
    result = ""
    for rec in obj.split("\n"):
        if(rec.find("Payload")>0 or rec.find("Records")>0):
            continue
        result += rec + "\n" # remove by split

    return result

def create_list_of_int(column_pos,obj):
    res = 0
    list_of_int = [] 
    for rec in obj.split("\n"):
        col_num = 1
        if ( len(rec) == 0):
            continue;
        for col in rec.split(","):
            if (col_num == column_pos):
                list_of_int.append(int(col));
            col_num+=1; 

    return list_of_int
       
def test_count_operation():
    csv_obj_name = "csv_star_oper"
    bucket_name = "test"
    num_of_rows = 10
    obj_to_load = create_random_csv_object(num_of_rows,10)
    upload_csv_object(bucket_name,csv_obj_name,obj_to_load)
    res = remove_xml_tags_from_result( run_s3select(bucket_name,csv_obj_name,"select count(0) from stdin;") ).replace(",","")

    assert num_of_rows == int( res )

def test_column_sum_min_max():
    csv_obj = create_random_csv_object(10000,10)

    csv_obj_name = "csv_10000x10"
    bucket_name = "test"
    upload_csv_object(bucket_name,csv_obj_name,csv_obj)
    
    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select min(int(_1)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 1 , csv_obj )
    res_target = min( list_int )

    assert int(res_s3select) == int(res_target) 

    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select min(int(_4)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 4 , csv_obj )
    res_target = min( list_int )

    assert int(res_s3select) == int(res_target) 
    
    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select max(int(_4)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 4 , csv_obj )
    res_target = max( list_int )

    assert int(res_s3select) == int(res_target) 
    
    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select max(int(_7)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 7 , csv_obj )
    res_target = max( list_int )

    assert int(res_s3select) == int(res_target) 
    
    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select sum(int(_4)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 4 , csv_obj )
    res_target = sum( list_int )

    assert int(res_s3select) == int(res_target) 
    
    res_s3select = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select sum(int(_7)) from stdin;")  ).replace(",","")
    list_int = create_list_of_int( 7 , csv_obj )
    res_target = sum( list_int )

    assert int(res_s3select) == int(res_target) 
    

def test_alias():

    # purpose: test is comparing result of exactly the same queries , one with alias the other without.
    # this test is setting alias on 3 projections, the third projection is using other projection alias, also the where clause is using aliases
    # the test validate that where-clause and projections are executing aliases correctly, bare in mind that each alias has its own cache,
    # and that cache need to be invalidate per new row. 

    csv_obj = create_random_csv_object(10000,10)

    csv_obj_name = "csv_10000x10"
    bucket_name = "test"
    upload_csv_object(bucket_name,csv_obj_name,csv_obj)

    res_s3select_alias = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select int(_1) as a1, int(_2) as a2 , (a1+a2) as a3 from stdin where a3>100 and a3<300;")  ).replace(",","")

    res_s3select_no_alias = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select int(_1),int(_2),int(_1)+int(_2) from stdin where (int(_1)+int(_2))>100 and (int(_1)+int(_2))<300;")  ).replace(",","")

    assert res_s3select_alias == res_s3select_no_alias


def test_alias_cyclic_refernce():

    # purpose of test is to validate the s3select-engine is able to detect a cyclic reference to alias.
    
    csv_obj = create_random_csv_object(10000,10)

    csv_obj_name = "csv_10000x10"
    bucket_name = "test"
    upload_csv_object(bucket_name,csv_obj_name,csv_obj)

    res_s3select_alias = remove_xml_tags_from_result(  run_s3select(bucket_name,csv_obj_name,"select int(_1) as a1,int(_2) as a2, a1+a4 as a3, a5+a1 as a4, int(_3)+a3 as a5 from stdin;")  )

    find_res = res_s3select_alias.find("number of calls exceed maximum size, probably a cyclic reference to alias");
    
    assert int(find_res) >= 0