from decimal import Decimal

from rest_framework import serializers
from core.serializers.base import BaseModelSerializer
from apps.projects.models import Project
from apps.workspaces.models import PriceUnit


class ProjectSerializer(BaseModelSerializer):
    class Meta:
        model = Project
        fields = BaseModelSerializer.Meta.fields + (
            "workspace",
            "name",
            "client",
            "description",
            "is_archived",
            "color",
        )
        read_only_fields = fields

    def to_representation(self, instance):
        representation = super().to_representation(instance)
        if instance.client:
            representation['client'] = {
                'id': instance.client.id,
                'name': instance.client.name
            }
        return representation


class ProjectCreateSerializer(serializers.Serializer):
    workspace = serializers.UUIDField()
    name = serializers.CharField(max_length=255)
    client = serializers.UUIDField(required=False, allow_null=True)
    description = serializers.CharField(required=False, allow_blank=True, default="")
    color = serializers.CharField(max_length=7, required=False, allow_blank=True, default="")


class ProjectUpdateSerializer(serializers.Serializer):
    name = serializers.CharField(max_length=255, required=False)
    client = serializers.UUIDField(required=False, allow_null=True)
    description = serializers.CharField(required=False, allow_blank=True)
    color = serializers.CharField(max_length=7, required=False, allow_blank=True)
    is_archived = serializers.BooleanField(required=False)


class ProjectAccessQuerySerializer(serializers.Serializer):
    workspace = serializers.UUIDField()
    user = serializers.UUIDField()


class ProjectAccessMutationSerializer(serializers.Serializer):
    workspace = serializers.UUIDField()
    user = serializers.UUIDField()
    project_ids = serializers.ListField(
        child=serializers.UUIDField(),
        allow_empty=False,
    )


class ProjectAccessRateMutationSerializer(serializers.Serializer):
    workspace = serializers.UUIDField()
    user = serializers.UUIDField()
    project = serializers.UUIDField()
    hourly_rate = serializers.DecimalField(
        max_digits=10,
        decimal_places=2,
        min_value=Decimal("0.01"),
        required=False,
        allow_null=True,
    )
    currency = serializers.CharField(max_length=3, required=False, default="USD")

    def validate_currency(self, value):
        code = value.upper()
        if not PriceUnit.objects.filter(code=code, is_deleted=False).exists():
            raise serializers.ValidationError("Selected price unit is invalid.")
        return code