from django.contrib.auth import password_validation, authenticate
from django.core.validators import RegexValidator, FileExtensionValidator


from rest_framework import serializers
from rest_framework.authtoken.models import Token
from rest_framework.validators import UniqueValidator


from apps.users.models import User

class UserModelSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = (
            'username',
            'first_name',
            'last_name',
            'email',
        )

class UserLoginSerializer(serializers.Serializer):
    email = serializers.EmailField()
    password = serializers.CharField(min_length=8, max_length=64)

    def validate(self, data):    
        user = authenticate(username=data['email'], password=data['password'])
        if not user:
            raise serializers.ValidationError('Las credenciales no son válidas')
        self.context['user'] = user
        return data

    def create(self, data):
        """Generar o recuperar token."""
        token, created = Token.objects.get_or_create(user=self.context['user'])
        return self.context['user'], token.key


class UserSignUpSerializer(serializers.Serializer):

    email = serializers.EmailField(
        validators=[UniqueValidator(queryset=User.objects.all())]
    )
    username = serializers.CharField(
        min_length=4,
        max_length=20,
        validators=[UniqueValidator(queryset=User.objects.all())]
    )

    
    phone_regex = RegexValidator(
        regex=r'\+?1?\d{9,15}$',
        message="Debes introducir un número con el siguiente formato: +999999999. El límite son de 15 dígitos."
    )
    phone = serializers.CharField(validators=[phone_regex], required=False)

    password = serializers.CharField(min_length=8, max_length=64)
    password_confirmation = serializers.CharField(min_length=8, max_length=64)

    first_name = serializers.CharField(min_length=2, max_length=50)
    last_name = serializers.CharField(min_length=2, max_length=100)

    def validate(self, data):
        passwd = data['password']
        passwd_conf = data['password_confirmation']
        if passwd != passwd_conf:
            raise serializers.ValidationError("Las contraseñas no coinciden")
        password_validation.validate_password(passwd)

        return data

    def create(self, data):
        data.pop('password_confirmation')
        user = User.objects.create_user(**data)
        return user