#!/usr/bin/env python3

# http://inamidst.com/saxo/
# Created by Sean B. Palmer

import json
import urllib.parse
import urllib.request

import saxo

q = urllib.parse.quote

def secret_key():
    key = "btr-key.key"
    with saxo.database() as db:
        query = "SELECT * FROM saxo_data where key = ?"
        try: result = list(db.query(query, key))[0][1]
        except: result = None
        return result

def token():
    tokreq = urllib.parse.urlencode({
        "client_id": "saxo",
        "client_secret": secret_key(),
        "scope": "http://api.microsofttranslator.com/",
        "grant_type": "client_credentials"
    }).encode("ascii")
    oauth2 = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13"
    t = urllib.request.urlopen(oauth2, data=tokreq)
    tokres = json.loads(t.read().decode("ascii"))
    return tokres.get("access_token")

def optflag(arg, flag=None):
    if arg.startswith(":"):
        if " " in arg:
            flag, arg = arg.split(" ", 1)
        else:
            flag, arg = arg, ""
        flag = flag[1:]
    return arg, flag

@saxo.command()
def btr(arg):
    arg, i = optflag(arg, "")
    arg, o = optflag(arg, "en")

    base = "http://api.microsofttranslator.com/v2/Http.svc/Translate"
    query = "text=%s&from=%s&to=%s"
    query = query % (q(arg), q(i), q(o))

    class ErrorHandler(urllib.request.HTTPDefaultErrorHandler):
        def http_error_default(self, req, fp, code, msg, hdrs):
            return fp

    handlers = [ErrorHandler()]
    opener = urllib.request.build_opener(*handlers)
    urllib.request.install_opener(opener)

    bearer = token()
    if bearer is None:
        return "No API key set. Get an admin to do it using .btr-key"
    req = urllib.request.Request("?".join((base, query)), headers={
        "Authorization": "Bearer %s" % bearer
    })

    f = urllib.request.urlopen(req)
    xml = f.read().decode("utf-8")
    xml = xml.split(">", 1).pop()
    xml = xml.rsplit("<", 1).pop(0)
    return '"%s" (Bing Translate)' % xml