from rest_framework import serializers

from apps.bizapps.models import Appointment, Customer, LedgerEntry, Product, StockMovement


class CustomerSerializer(serializers.ModelSerializer):
    class Meta:
        model = Customer
        fields = ["id", "name", "phone", "email", "address", "notes", "updated_at"]
        read_only_fields = ["updated_at"]


class LedgerEntrySerializer(serializers.ModelSerializer):
    class Meta:
        model = LedgerEntry
        fields = ["id", "entry_type", "title", "amount", "category", "entry_date", "note", "updated_at"]
        read_only_fields = ["updated_at"]


class ProductSerializer(serializers.ModelSerializer):
    class Meta:
        model = Product
        fields = [
            "id",
            "name",
            "sku",
            "category",
            "quantity",
            "unit_price",
            "low_stock_threshold",
            "notes",
            "updated_at",
        ]
        read_only_fields = ["updated_at"]


class StockMovementSerializer(serializers.ModelSerializer):
    class Meta:
        model = StockMovement
        fields = ["id", "delta", "quantity_after", "note", "created_at"]
        read_only_fields = fields


class AdjustStockSerializer(serializers.Serializer):
    delta = serializers.FloatField()
    note = serializers.CharField(max_length=255, required=False, allow_blank=True, default="")

    def validate_delta(self, value):
        if value == 0:
            raise serializers.ValidationError("مقدار تغییر نمی‌تواند صفر باشد.")
        return value


class AppointmentSerializer(serializers.ModelSerializer):
    class Meta:
        model = Appointment
        fields = ["id", "customer_name", "customer_phone", "title", "start_at", "status", "notes", "updated_at"]
        read_only_fields = ["updated_at"]