# coding=utf-8

from rest_framework import serializers

from utils.exceptions import CustomError
from utils.serializersfield import BooleanCharField
from apps.base import Formater
from apps.coupon.models import Coupon, CouponItem


class CouponSerializer(serializers.ModelSerializer):
    show_amount = serializers.SerializerMethodField()
    create_user_text = serializers.CharField(source='create_user.employee.name', read_only=True)
    date_type_text = serializers.CharField(source="get_date_type_display", read_only=True)
    create_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M', read_only=True)

    def get_show_amount(self, obj):
        return Formater.formatAmountShow(obj.amount)

    class Meta:
        model = Coupon
        fields = '__all__'

    def validate(self, attrs):
        if 'amount' in attrs:
            attrs['amount'] = Formater.formatAmount(attrs['amount'])
        if attrs['validity_begin_time'] and attrs['validity_end_time'] and attrs['validity_begin_time'] > attrs['validity_end_time']:
            raise CustomError(u'无效的有效期开始/结束时间')
        if attrs['receive_begin_time'] and attrs['receive_end_time'] and attrs['receive_begin_time'] > attrs['receive_end_time']:
            raise CustomError(u'无效的领取开始/结束时间')
        return attrs

    def create(self, validated_data):
        user = self.context['request'].user
        validated_data['tenant'] = user.employee.tenant
        validated_data['create_user'] = user
        instance = super(CouponSerializer, self).create(validated_data)
        return instance

    def update(self, instance, validated_data):
        if instance.tenant != self.context['request'].user.employee.tenant:
            raise CustomError(u'禁止跨租户操作！')
        if instance.delete:
            raise CustomError(u'优惠券[%s]已经被删除,禁止操作' % instance.name)
        if instance.left_count > validated_data['total_count']:
            raise CustomError(u'总数量不能小于已领取数量！')
        instance = super(CouponSerializer, self).update(instance, validated_data)
        return instance


class CouponItemSerializer(serializers.ModelSerializer):
    write_off_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M', read_only=True)
    write_off_user_text = serializers.CharField(source='write_off_user.employee.name', read_only=True)
    is_used_text = BooleanCharField(source='is_used', read_only=True)
    validity_begin_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M', read_only=True)
    validity_end_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M', read_only=True)
    create_time = serializers.DateTimeField(format='%Y-%m-%d %H:%M', read_only=True)
    customer_name = serializers.CharField(source='customer.name', read_only=True)
    customer_tel = serializers.CharField(source='customer.tel', read_only=True)
    coupon_name = serializers.CharField(source='coupon.name', read_only=True)
    amount = serializers.SerializerMethodField()

    def get_amount(self, obj):
        return Formater.formatAmountShow(obj.amount)

    class Meta:
        model = CouponItem
        fields = '__all__'