from rest_framework import serializers
from django.contrib.auth.models import User
from django.contrib.auth import authenticate

class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = ['id', 'username', 'email', 'date_joined']
        read_only_fields = ['date_joined']

class RegisterSerializer(serializers.ModelSerializer):
    password = serializers.CharField(write_only=True, min_length=6)
    
    class Meta:
        model = User
        fields = ['username', 'email', 'password']
    
    def create(self, validated_data):
        user = User.objects.create_user(
            username=validated_data['username'],
            email=validated_data.get('email', ''),
            password=validated_data['password']
        )
        return user

class LoginSerializer(serializers.Serializer):
    username = serializers.CharField()
    password = serializers.CharField(write_only=True)
    
    def validate(self, data):
        user = authenticate(**data)
        if user and user.is_active:
            return user
        raise serializers.ValidationError("用户名或密码错误")