"""partner 序列化器（async 兼容）。"""

from rest_framework import serializers
from apps.core.serializers import AsyncModelSerializer
from .models import PriceLevel, Contact, Customer, Supplier


class PriceLevelSerializer(AsyncModelSerializer):
    class Meta:
        model = PriceLevel
        fields = [
            "id", "code", "name", "discount_rate", "sort_order",
            "is_deleted", "created_at", "updated_at",
        ]
        read_only_fields = ["id", "created_at", "updated_at"]


class ContactSerializer(AsyncModelSerializer):
    customer_code = serializers.CharField(source="customer.code", read_only=True, default=None)
    supplier_code = serializers.CharField(source="supplier.code", read_only=True, default=None)

    class Meta:
        model = Contact
        fields = [
            "id", "name", "phone", "email", "title", "is_primary",
            "customer", "supplier", "customer_code", "supplier_code",
            "is_deleted", "created_at", "updated_at",
        ]
        read_only_fields = ["id", "created_at", "updated_at"]


class CustomerSerializer(AsyncModelSerializer):
    price_level_code = serializers.CharField(source="price_level.code", read_only=True, default=None)
    balance = serializers.SerializerMethodField()

    class Meta:
        model = Customer
        fields = [
            "id", "code", "name", "kind", "contact_name", "phone", "email",
            "address", "tax_number", "bank_account",
            "price_level_code", "credit_limit", "initial_receivable",
            "is_active", "remark", "balance",
            "is_deleted", "created_at", "updated_at",
        ]
        read_only_fields = ["id", "created_at", "updated_at", "balance"]

    def get_balance(self, obj):
        # 阶段 2 接入应收模块后实算
        return str(obj.initial_receivable)


class SupplierSerializer(AsyncModelSerializer):
    balance = serializers.SerializerMethodField()

    class Meta:
        model = Supplier
        fields = [
            "id", "code", "name", "contact_name", "phone", "email",
            "address", "tax_number", "bank_account",
            "initial_payable", "is_active", "remark", "balance",
            "is_deleted", "created_at", "updated_at",
        ]
        read_only_fields = ["id", "created_at", "updated_at", "balance"]

    def get_balance(self, obj):
        return str(obj.initial_payable)