from rest_framework import serializers
from ..models import MedicalBill, Payment, InsuranceClaim, BillLineItem, ClaimStatusUpdate, BillingConfiguration


class BaseSerializer(serializers.ModelSerializer):
    """Base serializer with common functionality"""
    
    class Meta:
        fields = ['id']
        read_only_fields = ['created_at', 'updated_at']


class BillLineItemSerializer(serializers.ModelSerializer):
    """Serializer for BillLineItem model"""
    
    class Meta:
        model = BillLineItem
        fields = [
            'line_item_id', 'service_code', 'service_description', 
            'quantity', 'unit_price', 'total_amount', 'modifier_codes',
            'diagnosis_codes', 'provider', 'service_date', 'place_of_service',
            'notes', 'created_at', 'updated_at'
        ]
        read_only_fields = ['line_item_id', 'created_at', 'updated_at']


class MedicalBillSerializer(serializers.ModelSerializer):
    """Serializer for MedicalBill model"""
    line_items = BillLineItemSerializer(many=True, read_only=True)
    patient_name = serializers.CharField(source='patient.get_full_name', read_only=True)
    patient_mrn = serializers.CharField(source='patient.mrn', read_only=True)
    days_outstanding = serializers.IntegerField(read_only=True)
    is_overdue = serializers.BooleanField(read_only=True)
    
    class Meta:
        model = MedicalBill
        fields = [
            'bill_id', 'bill_number', 'patient', 'patient_name', 'patient_mrn',
            'encounter', 'admission', 'bill_type', 'bill_date', 'due_date',
            'service_date_from', 'service_date_to', 'provider', 'facility',
            'referring_provider', 'total_amount', 'paid_amount', 'balance_amount',
            'status', 'priority', 'billing_address', 'insurance_info',
            'authorization_number', 'claim_frequency', 'statement_message',
            'internal_notes', 'days_outstanding', 'is_overdue', 'line_items',
            'created_at', 'updated_at'
        ]
        read_only_fields = [
            'bill_id', 'bill_number', 'paid_amount', 'balance_amount',
            'days_outstanding', 'is_overdue', 'created_at', 'updated_at'
        ]


class PaymentSerializer(serializers.ModelSerializer):
    """Serializer for Payment model"""
    medical_bill_number = serializers.CharField(source='medical_bill.bill_number', read_only=True)
    patient_name = serializers.CharField(source='medical_bill.patient.get_full_name', read_only=True)
    received_by_name = serializers.CharField(source='received_by.get_full_name', read_only=True)
    processed_by_name = serializers.CharField(source='processed_by.get_full_name', read_only=True)
    
    class Meta:
        model = Payment
        fields = [
            'payment_id', 'payment_number', 'medical_bill', 'medical_bill_number',
            'patient_name', 'payment_date', 'payment_amount', 'refund_amount',
            'payment_method', 'payment_source', 'check_number', 'card_type',
            'card_last_four', 'authorization_code', 'transaction_id',
            'bank_name', 'deposit_date', 'status', 'insurance_claim',
            'eob_number', 'received_by', 'received_by_name', 'processed_by',
            'processed_by_name', 'notes', 'created_at', 'updated_at'
        ]
        read_only_fields = [
            'payment_id', 'payment_number', 'created_at', 'updated_at'
        ]


class ClaimStatusUpdateSerializer(serializers.ModelSerializer):
    """Serializer for ClaimStatusUpdate model"""
    
    class Meta:
        model = ClaimStatusUpdate
        fields = [
            'update_id', 'status', 'status_date', 'response_code',
            'response_description', 'notes', 'updated_by',
            'created_at', 'updated_at'
        ]
        read_only_fields = ['update_id', 'created_at', 'updated_at']


class InsuranceClaimSerializer(serializers.ModelSerializer):
    """Serializer for InsuranceClaim model"""
    medical_bill_number = serializers.CharField(source='medical_bill.bill_number', read_only=True)
    patient_name = serializers.CharField(source='medical_bill.patient.get_full_name', read_only=True)
    insurance_company = serializers.CharField(source='insurance_info.insurance_company', read_only=True)
    status_updates = ClaimStatusUpdateSerializer(many=True, read_only=True)
    days_pending = serializers.IntegerField(read_only=True)
    
    class Meta:
        model = InsuranceClaim
        fields = [
            'claim_id', 'claim_number', 'medical_bill', 'medical_bill_number',
            'patient_name', 'insurance_info', 'insurance_company', 'claim_type',
            'submission_date', 'response_date', 'billed_amount', 'allowed_amount',
            'paid_amount', 'patient_responsibility', 'deductible_amount',
            'copay_amount', 'coinsurance_amount', 'status', 'denial_reason',
            'prior_auth_number', 'claim_frequency', 'place_of_service',
            'diagnosis_codes', 'procedure_codes', 'provider_npi',
            'facility_npi', 'subscriber_id', 'group_number', 'plan_name',
            'payer_id', 'clearinghouse', 'electronic_claim_id',
            'paper_claim_tracking', 'resubmission_code', 'original_claim_number',
            'corrected_claim_indicator', 'days_pending', 'status_updates',
            'created_at', 'updated_at'
        ]
        read_only_fields = [
            'claim_id', 'claim_number', 'days_pending', 'created_at', 'updated_at'
        ]


class BillingConfigurationSerializer(serializers.ModelSerializer):
    """Serializer for BillingConfiguration model"""
    
    class Meta:
        model = BillingConfiguration
        fields = [
            'config_id', 'payment_terms_days', 'late_fee_percentage',
            'minimum_payment_amount', 'auto_generate_statements',
            'statement_frequency', 'electronic_billing_enabled',
            'paper_billing_enabled', 'credit_card_processing_enabled',
            'ach_processing_enabled', 'payment_plan_enabled',
            'collection_agency_threshold', 'write_off_threshold',
            'default_payment_method', 'require_authorization',
            'auto_post_payments', 'auto_post_adjustments',
            'billing_address_required', 'insurance_verification_required',
            'copay_collection_required', 'created_at', 'updated_at'
        ]
        read_only_fields = ['config_id', 'created_at', 'updated_at']