from vendor.coinify.coinify_api import CoinifyAPI
from .models import CoinifyAPIRequest, CoinifyAPIInvoice, CoinifyAPICallback
from django.conf import settings
import json
import logging
import requests

logger = logging.getLogger("bornhack.%s" % __name__)


def process_coinify_invoice_json(invoicejson, order, request):
    # create or update the invoice object in our database
    coinifyinvoice, created = CoinifyAPIInvoice.objects.update_or_create(
        coinify_id=invoicejson['id'],
        order=order,
        defaults={
            'invoicejson': invoicejson
        },
    )

    # if the order is paid in full call the mark as paid method now
    if invoicejson['state'] == 'complete' and not coinifyinvoice.order.paid:
        coinifyinvoice.order.mark_as_paid(request=request)

    return coinifyinvoice


def save_coinify_callback(request, order):
    # first make a dict with all HTTP_ headers
    headerdict = {}
    for key, value in list(request.META.items()):
        if key[:5] == 'HTTP_':
            headerdict[key[5:]] = value

    # now attempt to parse json
    try:
        parsed = json.loads(request.body.decode('utf-8'))
    except Exception:
        parsed = ''

    # save this callback to db
    callbackobject = CoinifyAPICallback.objects.create(
        headers=headerdict,
        body=request.body,
        payload=parsed,
        order=order,
    )

    return callbackobject


def coinify_api_request(api_method, order, **kwargs):
    # Initiate coinify API
    coinifyapi = CoinifyAPI(
        settings.COINIFY_API_KEY,
        settings.COINIFY_API_SECRET
    )

    # is this a supported method?
    if not hasattr(coinifyapi, api_method):
        logger.error("coinify api method not supported" % api_method)
        return False

    # get and run the API call using the SDK
    method = getattr(coinifyapi, api_method)

    # catch requests exceptions as described in https://github.com/CoinifySoftware/python-sdk#catching-errors and
    # http://docs.python-requests.org/en/latest/user/quickstart/#errors-and-exceptions
    try:
        response = method(**kwargs)
    except requests.exceptions.RequestException as E:
        logger.error("requests exception during coinify api request: %s" % E)
        return False

    # save this API request to the database
    req = CoinifyAPIRequest.objects.create(
        order=order,
        method=api_method,
        payload=kwargs,
        response=response,
    )
    logger.debug("saved coinify api request %s in db" % req.id)

    return req


def handle_coinify_api_response(apireq, order, request):
    if apireq.method == 'invoice_create' or apireq.method == 'invoice_get':
        # Parse api response
        if apireq.response['success']:
            # save this new coinify invoice to the DB
            coinifyinvoice = process_coinify_invoice_json(
                invoicejson=apireq.response['data'],
                order=order,
                request=request,
            )
            return coinifyinvoice
        else:
            api_error = apireq.response['error']
            logger.error("coinify API error: %s (%s)" % (
                api_error['message'],
                api_error['code']
            ))
            return False
    else:
        logger.error("coinify api method not supported" % apireq.method)
        return False


################### API CALLS ################################################


def get_coinify_invoice(coinify_invoiceid, order, request):
    # put args for API request together
    invoicedict = {
        'invoice_id': coinify_invoiceid
    }

    # perform the api request
    apireq = coinify_api_request(
        api_method='invoice_get',
        order=order,
        **invoicedict
    )

    coinifyinvoice = handle_coinify_api_response(apireq, order, request)
    return coinifyinvoice


def create_coinify_invoice(order, request):
    # put args for API request together
    invoicedict = {
        'amount': float(order.total),
        'currency': 'DKK',
        'plugin_name': 'BornHack webshop',
        'plugin_version': '1.0',
        'description': 'BornHack order id #%s' % order.id,
        'callback_url': order.get_coinify_callback_url(request),
        'return_url': order.get_coinify_thanks_url(request),
        'cancel_url': order.get_cancel_url(request),
    }

    # perform the API request
    apireq = coinify_api_request(
        api_method='invoice_create',
        order=order,
        **invoicedict
    )

    coinifyinvoice = handle_coinify_api_response(apireq, order, request)
    return coinifyinvoice