from .abstract import AbstractConnectionClient
from django.conf import settings
import plaid
import os
import datetime


def format_error(e):
    return {
        'error': {
            'display_message': e.display_message,
            'error_code': e.code,
            'error_type': e.type,
            'error_message': e.message}}


class Connection(AbstractConnectionClient):

    def __init__(self, credentials):
        print("Plaid Connection Creation Initiated")
        self.credentials = credentials

        # Fill in your Plaid API keys -
        # https://dashboard.plaid.com/account/keys
        self.PLAID_CLIENT_ID = settings.PLAID_CLIENT_ID
        self.PLAID_SECRET = settings.PLAID_SECRET
        self.PLAID_PUBLIC_KEY = settings.PLAID_PUBLIC_KEY
        # Use 'sandbox' to test with Plaid's Sandbox environment (username: user_good,
        # password: pass_good)
        # Use `development` to test with live users and credentials and `production`
        # to go live
        self.PLAID_ENV = settings.PLAID_ENV
        # PLAID_PRODUCTS is a comma-separated list of products to use when initializing
        # Link. Note that this list must contain 'assets' in order for the app to be
        # able to create and retrieve asset reports.
        self.PLAID_PRODUCTS = settings.PLAID_PRODUCTS

        # PLAID_COUNTRY_CODES is a comma-separated list of countries for which users
        # will be able to select institutions from.
        self.PLAID_COUNTRY_CODES = settings.PLAID_COUNTRY_CODES
        self.client = plaid.Client(
            client_id=self.PLAID_CLIENT_ID,
            secret=self.PLAID_SECRET,
            environment=self.PLAID_ENV,
            public_key=self.PLAID_PUBLIC_KEY,
            # api_version='2019-05-29',
            api_version='2020-09-14',
            #webhook='https://qrtr-services.herokuapp.com/connection/plaid-webhook/'
            )
        public_key = self.credentials.get('public_token')
        auth_token = self.credentials.get('auth_token')
        if not auth_token and public_key:
            print("Getting Auth Token From Public Key")
            authorization = self.get_auth_token(public_key)
            print("AUTHORIZATION:")
            print(authorization)
            auth_token = authorization.get("access_token")
            item_id = authorization.get("item_id")
            if "error" in auth_token:
                raise ValueError(f"Unable to generate Auth Token, {auth_token}")
            self.credentials['auth_token'] = auth_token
            self.credentials['item_id'] = item_id
        print("Plaid Connection successful")
        print(self.credentials)

    def get_auth_token(self, public_token):
        try:
            exchange_response = self.client.Item.public_token.exchange(
                public_token)
        except Exception as e:
            print("Error Occurred")
            print(e)
            return format_error(e)
        access_token = exchange_response['access_token']
        item_id = exchange_response['item_id']
        return {"access_token":access_token, "item_id":item_id}
    
    def get_accounts(self, auth_token=None):
        if not auth_token:
            auth_token = self.credentials.get('auth_token')
        if not auth_token:
            raise Exception("Missing Auth Token")
        try:
            accounts = self.client.Accounts.get(auth_token)
        except Exception as e:
            print(e)
            accounts = None
        return accounts

    def get_transactions(
            self,
            start_date=None,
            end_date=None,
            auth_token=None):
        if not auth_token:
            auth_token = self.credentials.get('auth_token')
        if not auth_token:
            raise Exception("Missing Auth Token")
        if not start_date:
            start_date = '{:%Y-%m-%d}'.format(
                datetime.datetime.now() + datetime.timedelta(-30))
        if not end_date:
            end_date = '{:%Y-%m-%d}'.format(datetime.datetime.now())
        try:
            transactions_resp = self.client.Transactions.get(
                auth_token, start_date, end_date)
        except plaid.errors.PlaidError as e:
            return format_error(e)
        return transactions_resp.get("transactions")