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

from onboarding.models import ISPRegistration, PaymentSettings


User = get_user_model()


class ISPRegistrationSerializer(serializers.Serializer):
    company_name = serializers.CharField(max_length=255)
    city = serializers.CharField(max_length=150, required=False, allow_blank=True)
    first_name = serializers.CharField(max_length=150)
    last_name = serializers.CharField(max_length=150, required=False, allow_blank=True)
    email = serializers.EmailField()
    password = serializers.CharField(write_only=True, trim_whitespace=False)
    amount_due = serializers.DecimalField(max_digits=12, decimal_places=2, required=False, allow_null=True)

    def validate_email(self, value):
        if User.objects.filter(email__iexact=value).exists():
            raise serializers.ValidationError("An account with this email already exists.")
        return value.lower()

    def validate_password(self, value):
        validate_password(value)
        return value


class ReceiptUploadSerializer(serializers.Serializer):
    receipt = serializers.ImageField()

    def validate_receipt(self, value):
        if value.size > 5 * 1024 * 1024:
            raise serializers.ValidationError("Receipt image must be 5 MB or smaller.")
        return value


class RejectRegistrationSerializer(serializers.Serializer):
    reason = serializers.CharField(max_length=1000, required=False, allow_blank=True)


class PaymentSettingsSerializer(serializers.ModelSerializer):
    class Meta:
        model = PaymentSettings
        fields = ("id", "bank_name", "account_title", "account_number", "iban", "amount", "instructions", "is_active")
        read_only_fields = ("id",)


class RegistrationListSerializer(serializers.ModelSerializer):
    company_name = serializers.CharField(source="organization.name", read_only=True)
    organization_code = serializers.CharField(source="organization.code", read_only=True)
    owner_email = serializers.EmailField(source="owner.email", read_only=True)
    owner_name = serializers.SerializerMethodField()
    receipt_url = serializers.SerializerMethodField()

    class Meta:
        model = ISPRegistration
        fields = ("id", "company_name", "organization_code", "owner_email", "owner_name", "amount_due", "status", "receipt_url", "rejection_reason", "submitted_at", "verified_at", "created_at")

    def get_owner_name(self, obj):
        return f"{obj.owner.first_name} {obj.owner.last_name}".strip()

    def get_receipt_url(self, obj):
        if not obj.receipt:
            return None
        return f"/onboarding/superadmin/registrations/{obj.id}/receipt/"