#! /usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org>
# Licensed under GPL v3 or later

from __future__ import print_function
import urllib
import urllib2
import simplejson as json
from decimal import Decimal
import os
import base64

if __name__ == '__main__':
	import sys
	sys.path.append('.')
from freitagslib.item import Item
from freitagslib.tools import require_type


DEPOSIT_CASH = 1
DEPOSIT_BANK = 2


_BASE_URL = 'https://k4ever.freitagsrunde.org:443/api2/'

_auth = base64.encodestring('%s:%s' % (os.environ['BARCODE_PLUGIN_USER'], os.environ['BARCODE_PLUGIN_PASS'])).rstrip()
_headers = {'Authorization':'Basic %s' % _auth}

ITEM_ONLY, DEPOSIT_ONLY, ITEM_AND_DEPOSIT = range(3)


def _request(api_rel_url, para_map, method):
	url = _BASE_URL + api_rel_url
	data = urllib.urlencode(para_map)

	if method == 'GET':
		url = '%s?%s' % (url, data)
		req = urllib2.Request(url, headers=_headers)
	elif method == 'POST':
		req = urllib2.Request(url, data=data, headers=_headers)
	else:
		raise ValueError('Unsupported method "%s"' % method)

	response = urllib2.urlopen(req)
	return response.read()


def get_user_name_from_auth_blob(authblob):
	content = _request('auth/user/', {'authblob':authblob}, method='GET')
	d = json.loads(content)
	return d['username']


def buy_item(item_id, what_about_it, user_name):
	require_type(int, item_id)
	assert(what_about_it in (ITEM_ONLY, DEPOSIT_ONLY, ITEM_AND_DEPOSIT))

	content = _request('buyable/item/' + urllib.quote(str(item_id)),
			{'user':user_name, 'deposit':what_about_it, 'amount':1}, method='POST')
	if content != 'Created':
		raise ValueError('Server says "%s"' % content)


def get_item(barcode):
	content = _request('buyable/item/',
			{'barcode':barcode}, method='GET')
	d = json.loads(content)
	return Item(d)
	

def get_balance(user_name):
	content = _request('account/balance/',
			{'user':user_name}, method='GET')
	d = json.loads(content)
	return Decimal(d['balance'])


def deposit(amount, transaction_type, user_name):
	require_type(Decimal, amount)
	require_type(int, transaction_type)

	content = _request('account/transactions/transact/',
			{'user':user_name, 'amount':amount, 'type':transaction_type}, method='POST')
	if content != 'OK':
		raise ValueError('Server says "%s"' % content)


if __name__ == '__main__':
	user_name = get_user_name_from_auth_blob(os.environ['BARCODE_PLUGIN_TEST_AUTH_BLOB'])
	print('User name: ' + user_name)

	buy_item(1, True, user_name)

	balance = get_balance(user_name)
	print('Balance is %f, type is "%s"' % (balance, type(balance).__name__))

	deposit(Decimal('0.01'), DEPOSIT_CASH, user_name)
	deposit(Decimal('0.01'), DEPOSIT_BANK, user_name)

	item = get_item(1)
	print('Item "%s" is %f Euro each' % (item.name, item.price))