from rest_framework import serializers

from apps.users.models import User
from django.utils import timezone


class PublicUserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ('avatar', 'name', 'username', 'email', "first_name", "last_name", "code")
        read_only_fields = ['avatar', 'name', 'username', 'email', 'first_name', 'last_name']

    def to_internal_value(self, data):
        code = data.get('code')
        if code:
            return User.objects.get(code=code)


class AccountSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = (
            "code",
            'username',
            'email',
            'phone_number',
            "first_name",
            "last_name",
            'name',
            'balance',
            'avatar',
            'iban',
            'iban_verified',
            )
        read_only_fields = ['code', 'balance', 'email', 'phone_number', 'iban_verified']


class RequestOTPSerializer(serializers.ModelSerializer):
    phone_number = serializers.CharField(required=True)
    ttl = serializers.SerializerMethodField()

    class Meta:
        model = User
        fields = (
            'phone_number',
            'otp_expire',
            'ttl'
            )

        read_only_fields = ['otp_expire', 'ttl']
        write_only_fields = []

    def save(self, **kwargs):
        validated_data = self.validated_data
        user = User.objects.filter(phone_number=validated_data['phone_number']).first()
        if not user:
            user = User.objects.create_user(**validated_data)

        if not user.otp_is_valid():
            user.set_otp()
            user.save()

        user.send_otp()

        self.instance = user
        return user

    def get_ttl(self, obj: User):
        if obj.otp_expire > timezone.now():
            ttl = obj.otp_expire - timezone.now()
            result = ttl.total_seconds()

        else:
            result = 0

        return result


class ChangePasswordSerializer(serializers.Serializer):
    old_password = serializers.CharField(required=True)
    old_password_gateway = serializers.CharField(default='password')
    new_password = serializers.CharField(required=True)