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# Module for calling the backend

from flask import g

import string
try:  # Python2 support
    import urllib.request
    import urllib.error
    import urllib.parse
except:
    import urllib2
import json
from utility.tools import USE_GN_SERVER, LOG_SQL, GN_SERVER_URL

from utility.logger import getLogger
logger = getLogger(__name__)


def fetch1(query, path=None, func=None):
    """Fetch one result as a Tuple using either a SQL query or the URI
path to GN_SERVER (when USE_GN_SERVER is True). Apply func to
GN_SERVER result when set (which should return a Tuple)

    """
    if USE_GN_SERVER and path:
        result = gn_server(path)
        if func != None:
            res2 = func(result)
        else:
            res2 = result,
        return res2
    else:
        return fetchone(query)


def fetchone(query):
    """Return tuple containing one row by calling SQL directly (the
original fetchone, but with logging)

    """
    def helper(query):
        res = g.db.execute(query)
        return res.fetchone()
    return logger.sql(query, helper)


def fetchall(query):
    """Return row iterator by calling SQL directly (the
original fetchall, but with logging)

    """
    def helper(query):
        res = g.db.execute(query)
        return res.fetchall()
    return logger.sql(query, helper)


def gn_server(path):
    """Return JSON record by calling GN_SERVER

    """
    res = ()
    try:
        res = urllib.request.urlopen(GN_SERVER_URL + path)
    except:
        res = urllib2.urlopen(GN_SERVER_URL + path)
    rest = res.read()
    res2 = json.loads(rest)
    return res2