from django.contrib.auth import get_user_model
from rest_framework import serializers
from .models import *
from .helpers import get_balance_for

from functools import reduce
from uncloud_vm.serializers import VMProductSerializer
from uncloud_vm.models import VMProduct

import uncloud_pay.stripe as stripe

###
# Users.

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = get_user_model()
        fields = ['username', 'email', 'balance']

    # Display current 'balance'
    balance = serializers.SerializerMethodField('get_balance')
    def __sum_balance(self, entries):
        return reduce(lambda acc, entry: acc + entry.amount, entries, 0)

    def get_balance(self, user):
        return get_balance_for(user)

###
# Payments and Payment Methods.

class PaymentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Payment
        fields = ['owner', 'amount', 'source', 'timestamp']

class PaymentMethodSerializer(serializers.ModelSerializer):
    class Meta:
        model = PaymentMethod
        fields = ['source', 'description', 'primary']

class CreditCardSerializer(serializers.Serializer):
    number = serializers.IntegerField()
    exp_month = serializers.IntegerField()
    exp_year = serializers.IntegerField()
    cvc = serializers.IntegerField()

class CreatePaymentMethodSerializer(serializers.ModelSerializer):
    credit_card = CreditCardSerializer()

    class Meta:
        model = PaymentMethod
        fields = ['source', 'description', 'primary', 'credit_card']

    def create(self, validated_data):
        credit_card = stripe.CreditCard(**validated_data.pop('credit_card'))
        user = self.context['request'].user
        customer = stripe.create_customer(user.username, user.email)
        # TODO check customer error
        customer_id = customer['response_object']['id']
        stripe_card = stripe.create_card(customer_id, credit_card)
        # TODO: check credit card error
        validated_data['stripe_card_id'] = stripe_card['response_object']['id']
class CreditCardSerializer(serializers.Serializer):
    number = serializers.IntegerField()
    exp_month = serializers.IntegerField()
    exp_year = serializers.IntegerField()
    cvc = serializers.IntegerField()

class CreatePaymentMethodSerializer(serializers.ModelSerializer):
    credit_card = CreditCardSerializer()

    class Meta:
        model = PaymentMethod
        fields = ['source', 'description', 'primary', 'credit_card']

    def create(self, validated_data):
        credit_card = stripe.CreditCard(**validated_data.pop('credit_card'))
        user = self.context['request'].user
        customer = stripe.create_customer(user.username, user.email)
        # TODO check customer error
        customer_id = customer['response_object']['id']
        stripe_card = stripe.create_card(customer_id, credit_card)
        # TODO: check credit card error
        validated_data['stripe_card_id'] = stripe_card['response_object']['id']
        payment_method = PaymentMethod.objects.create(**validated_data)
        return payment_method
        payment_method = PaymentMethod.objects.create(**validated_data)
        return payment_method

###
# Bills

# TODO: remove magic numbers for decimal fields
class BillRecordSerializer(serializers.Serializer):
    order = serializers.CharField()
    description = serializers.CharField()
    recurring_period = serializers.CharField()
    recurring_price = serializers.DecimalField(max_digits=10, decimal_places=2)
    recurring_count = serializers.DecimalField(max_digits=10, decimal_places=2)
    one_time_price = serializers.DecimalField(max_digits=10, decimal_places=2)
    amount = serializers.DecimalField(max_digits=10, decimal_places=2)

class BillSerializer(serializers.ModelSerializer):
    records = BillRecordSerializer(many=True, read_only=True)
    class Meta:
        model = Bill
        fields = ['owner', 'total', 'due_date', 'creation_date',
                'starting_date', 'ending_date', 'records', 'final']

###
# Orders & Products.

class OrderRecordSerializer(serializers.ModelSerializer):
    class Meta:
        model = OrderRecord
        fields  = ['one_time_price', 'recurring_price', 'description']


class OrderSerializer(serializers.ModelSerializer):
    records = OrderRecordSerializer(many=True, read_only=True)
    class Meta:
        model = Order
        fields = ['uuid', 'creation_date', 'starting_date', 'ending_date',
                'bill', 'recurring_period', 'records', 'recurring_price', 'one_time_price']

class ProductSerializer(serializers.Serializer):
    vms = VMProductSerializer(many=True, read_only=True)