# 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.benchmark import Bench

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

# from inspect import stack


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,
        if LOG_SQL:
            logger.debug("Replaced SQL call", query)
        logger.debug(path, res2)
        return res2
    else:
        return fetchone(query)


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

    """
    with Bench("SQL", LOG_SQL):
        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)

    """
    with Bench("SQL", LOG_SQL):
        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

    """
    with Bench("GN_SERVER", LOG_SQL):
        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)
        logger.debug(res2)
        return res2