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):
        start_date = attrs.get('start_date', getattr(self.instance, 'start_date', None))
        end_date = attrs.get('end_date', getattr(self.instance, 'end_date', None))
        start_time = attrs.get('start_time', getattr(self.instance, 'start_time', None))
        end_time = attrs.get('end_time', getattr(self.instance, 'end_time', None))

        if start_date and end_date and end_date < start_date:
            raise serializers.ValidationError({'end_date': 'La date de fin doit être après la date de début.'})
        if start_time and end_time and end_time <= start_time:
            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)