"""
Serializers for Billing Models
"""
from rest_framework import serializers
from .models import CreditTransaction, CreditUsageLog
from igny8_core.auth.models import Account
from igny8_core.business.billing.models import PaymentMethodConfig, Payment


class CreditTransactionSerializer(serializers.ModelSerializer):
    transaction_type_display = serializers.CharField(source='get_transaction_type_display', read_only=True)
    
    class Meta:
        model = CreditTransaction
        fields = [
            'id', 'transaction_type', 'transaction_type_display', 'amount',
            'balance_after', 'description', 'metadata', 'created_at'
        ]
        read_only_fields = ['created_at', 'account']


class CreditUsageLogSerializer(serializers.ModelSerializer):
    operation_type_display = serializers.CharField(source='get_operation_type_display', read_only=True)
    
    class Meta:
        model = CreditUsageLog
        fields = [
            'id', 'operation_type', 'operation_type_display', 'credits_used',
            'cost_usd', 'model_used', 'tokens_input', 'tokens_output',
            'related_object_type', 'related_object_id', 'metadata', 'created_at'
        ]
        read_only_fields = ['created_at', 'account']


class CreditBalanceSerializer(serializers.Serializer):
    """Serializer for credit balance response"""
    credits = serializers.IntegerField()
    plan_credits_per_month = serializers.IntegerField()
    credits_used_this_month = serializers.IntegerField()
    credits_remaining = serializers.IntegerField()


class UsageSummarySerializer(serializers.Serializer):
    """Serializer for usage summary response"""
    period = serializers.DictField()
    total_credits_used = serializers.IntegerField()
    total_cost_usd = serializers.DecimalField(max_digits=10, decimal_places=2)
    by_operation = serializers.DictField()
    by_model = serializers.DictField()


class PaymentMethodConfigSerializer(serializers.ModelSerializer):
    """Serializer for payment method configuration"""
    payment_method_display = serializers.CharField(source='get_payment_method_display', read_only=True)
    
    class Meta:
        model = PaymentMethodConfig
        fields = [
            'id', 'country_code', 'payment_method', 'payment_method_display',
            'is_enabled', 'display_name', 'instructions', 
            'bank_name', 'account_number', 'swift_code',
            'wallet_type', 'wallet_id', 'sort_order'
        ]
        read_only_fields = ['id']


class PaymentConfirmationSerializer(serializers.Serializer):
    """Serializer for manual payment confirmation"""
    invoice_id = serializers.IntegerField(required=True)
    payment_method = serializers.ChoiceField(
        choices=['bank_transfer', 'local_wallet'],
        required=True
    )
    manual_reference = serializers.CharField(
        required=True,
        max_length=255,
        help_text="Transaction reference number"
    )
    manual_notes = serializers.CharField(
        required=False,
        allow_blank=True,
        help_text="Additional notes about the payment"
    )
    amount = serializers.DecimalField(
        max_digits=10,
        decimal_places=2,
        required=True
    )
    proof_url = serializers.URLField(
        required=False,
        allow_blank=True,
        help_text="URL to receipt/proof of payment"
    )
class LimitCardSerializer(serializers.Serializer):
    """Serializer for individual limit card"""
    title = serializers.CharField()
    limit = serializers.IntegerField()
    used = serializers.IntegerField()
    available = serializers.IntegerField()
    unit = serializers.CharField()
    category = serializers.CharField()
    percentage = serializers.FloatField()


class UsageLimitsSerializer(serializers.Serializer):
    """Serializer for usage limits response"""
    limits = LimitCardSerializer(many=True)