from rest_framework import serializers
from .models import AvailabilityRequest, ScheduleEntry

class ScheduleEntrySerializer(serializers.ModelSerializer):
    status_label = serializers.CharField(source="get_status_display", read_only=True)
    class Meta:
        model = ScheduleEntry
        fields = "__all__"
        read_only_fields = ["created_at", "updated_at"]
    def validate(self, attrs):
        sd = attrs.get("start_date", getattr(self.instance, "start_date", None))
        ed = attrs.get("end_date", getattr(self.instance, "end_date", None))
        st = attrs.get("start_time", getattr(self.instance, "start_time", None))
        et = attrs.get("end_time", getattr(self.instance, "end_time", None))
        if sd and ed and ed < sd:
            raise serializers.ValidationError({"end_date": "La date de fin doit être après la date de début."})
        if st and et and et <= st:
            raise serializers.ValidationError({"end_time": "L'heure de fin doit être après l'heure de début."})
        return attrs

class AvailabilityRequestCreateSerializer(serializers.ModelSerializer):
    class Meta:
        model = AvailabilityRequest
        fields = ["guest_name", "message"]
    def validate_guest_name(self, value):
        value = value.strip()
        if len(value) < 2:
            raise serializers.ValidationError("Indique ton prénom ou ton nom.")
        return value

class AvailabilityRequestPublicSerializer(serializers.ModelSerializer):
    status_label = serializers.CharField(source="get_status_display", read_only=True)
    class Meta:
        model = AvailabilityRequest
        fields = ["public_token", "guest_name", "message", "status", "status_label", "duration_minutes", "available_until", "response_message", "requested_at", "responded_at"]

class AvailabilityRequestAdminSerializer(AvailabilityRequestPublicSerializer):
    class Meta(AvailabilityRequestPublicSerializer.Meta):
        fields = ["id"] + AvailabilityRequestPublicSerializer.Meta.fields

class AvailabilityResponseSerializer(serializers.Serializer):
    status = serializers.ChoiceField(choices=["accepted", "refused"])
    duration_minutes = serializers.IntegerField(required=False, allow_null=True, min_value=1, max_value=1440)
    response_message = serializers.CharField(required=False, allow_blank=True, max_length=500)