from rest_framework import serializers
from apps.clients.models import Client
from core.serializers.base import BaseModelSerializer


class ClientSerializer(BaseModelSerializer):
    """
    Serializer for retrieving and representing client details.
    """
    class Meta:
        model = Client
        fields = BaseModelSerializer.Meta.fields + (
            "workspace",
            "name",
            "notes",
            "thumbnail",
        )
        read_only_fields = fields

    def to_representation(self, instance):
        data = super().to_representation(instance)
        request = self.context.get("request")
        if instance.thumbnail:
            thumbnail_url = instance.thumbnail.url
            data["thumbnail"] = request.build_absolute_uri(thumbnail_url) if request else thumbnail_url
        else:
            data["thumbnail"] = None
        return data


def validate_thumbnail(value):
    if value is None:
        return value
    max_bytes = 2 * 1024 * 1024
    if getattr(value, "size", 0) > max_bytes:
        raise serializers.ValidationError("Image size must be 2MB or less.")
    content_type = (getattr(value, "content_type", "") or "").lower()
    allowed_types = {"image/jpeg", "image/png", "image/webp"}
    if content_type and content_type not in allowed_types:
        raise serializers.ValidationError("Unsupported image type. Use JPG, PNG, or WebP.")
    return value


class ClientCreateSerializer(serializers.Serializer):
    """
    Serializer for handling input data during client creation.
    """
    workspace_id = serializers.UUIDField()
    name = serializers.CharField(max_length=255)
    notes = serializers.CharField(allow_blank=True, required=False, default="")
    thumbnail = serializers.ImageField(required=False, allow_null=True)

    def validate_thumbnail(self, value):
        return validate_thumbnail(value)


class ClientUpdateSerializer(serializers.Serializer):
    """
    Serializer for handling input data during client updates.
    """
    name = serializers.CharField(max_length=255, required=False)
    notes = serializers.CharField(allow_blank=True, required=False)
    thumbnail = serializers.ImageField(required=False, allow_null=True)
    clear_thumbnail = serializers.BooleanField(required=False, default=False)

    def validate_thumbnail(self, value):
        return validate_thumbnail(value)