from rest_framework import serializers

from apps.reservations.models import Facility, FacilitySchedule, Reservation, Slot


class FacilitySerializer(serializers.ModelSerializer):
    class Meta:
        model = Facility
        fields = ["id", "name"]


class SlotSerializer(serializers.ModelSerializer):
    facility_name = serializers.CharField(source="facility.name", read_only=True)
    available = serializers.SerializerMethodField()

    class Meta:
        model = Slot
        fields = [
            "id", "facility", "facility_name", "line", "date", "start_time",
            "end_time", "capacity", "max_weight_kg", "booked_count", "blocked", "available",
        ]

    def get_available(self, obj):
        return obj.is_available()


class FacilityScheduleSerializer(serializers.ModelSerializer):
    facility_name = serializers.CharField(source="facility.name", read_only=True)

    class Meta:
        model = FacilitySchedule
        fields = [
            "id", "facility", "facility_name", "date", "is_open",
            "capacity", "start_time", "end_time", "note",
        ]


class ReservationSerializer(serializers.ModelSerializer):
    slot = SlotSerializer(read_only=True)
    customer_id = serializers.UUIDField(source="customer.id", read_only=True)
    customer_name = serializers.SerializerMethodField()

    class Meta:
        model = Reservation
        fields = [
            "id", "title", "customer", "customer_id", "customer_name", "slot",
            "status", "notes", "approved_at", "created_at",
        ]
        read_only_fields = ["customer", "status", "approved_at", "created_at"]

    def get_customer_name(self, obj):
        user = obj.customer.user
        return obj.customer.company_name or user.get_full_name() or user.username