from django.contrib.auth import get_user_model
from rest_framework import serializers

from apps.accounts.models import OtpChannel, PhoneOTP
from apps.accounts.services.phone import normalize_phone_number

User = get_user_model()


class UserSerializer(serializers.ModelSerializer):
    class Meta:
        model = User
        fields = [
            "id",
            "email",
            "phone_number",
            "first_name",
            "last_name",
            "role",
            "is_phone_verified",
            "preferred_language",
        ]
        read_only_fields = ["id", "role", "is_phone_verified"]


class RegisterSerializer(serializers.ModelSerializer):
    password = serializers.CharField(write_only=True, min_length=8)
    phone_number = serializers.CharField(max_length=20, required=True)

    class Meta:
        model = User
        fields = ["email", "password", "phone_number", "first_name", "last_name"]

    def validate_phone_number(self, value):
        if not value:
            return value
        try:
            return normalize_phone_number(value)
        except ValueError as exc:
            raise serializers.ValidationError(str(exc)) from exc

    def create(self, validated_data):
        return User.objects.create_user(**validated_data)


class OTPRequestSerializer(serializers.Serializer):
    phone_number = serializers.CharField(max_length=20)
    channel = serializers.ChoiceField(choices=OtpChannel.choices)

    def validate_phone_number(self, value):
        try:
            return normalize_phone_number(value)
        except ValueError as exc:
            raise serializers.ValidationError(str(exc)) from exc


class OTPVerifySerializer(serializers.Serializer):
    request_id = serializers.UUIDField()
    code = serializers.CharField(max_length=6)


class PhoneAuthRequestSerializer(serializers.Serializer):
    phone_number = serializers.CharField(max_length=20)
    channel = serializers.ChoiceField(choices=OtpChannel.choices)
    device_id = serializers.CharField(required=False, allow_blank=True, max_length=128, write_only=True)
    email = serializers.EmailField(required=False, allow_null=True, allow_blank=True)
    first_name = serializers.CharField(required=False, allow_blank=True)
    last_name = serializers.CharField(required=False, allow_blank=True)

    def validate_phone_number(self, value):
        try:
            return normalize_phone_number(value)
        except ValueError as exc:
            raise serializers.ValidationError(str(exc)) from exc


class PhoneAuthVerifySerializer(serializers.Serializer):
    request_id = serializers.UUIDField()
    code = serializers.CharField(max_length=6)


class OTPStatusSerializer(serializers.ModelSerializer):
    class Meta:
        model = PhoneOTP
        fields = ["id", "phone_number", "channel", "provider", "created_at", "expires_at", "verified_at"]
        read_only_fields = fields