package lfu

import (
	"github.com/pkg/errors"
)

type Measurable interface {
	Size() (int, error)
}

func DefaultGetValueSize[V any](value V) (int, error) {
	switch v := any(value).(type) {
	case int:
		return v, nil
	case int8:
		return int(v), nil
	case int32:
		return int(v), nil
	case int64:
		return int(v), nil
	case float32:
		return int(v), nil
	case float64:
		return int(v), nil
	case []byte:
		return len(v), nil
	case string:
		return len(v), nil
	}

	if measurable, ok := any(value).(Measurable); ok {
		size, err := measurable.Size()
		if err != nil {
			return 0, errors.WithStack(err)
		}

		return size, nil
	}

	return 0, errors.Errorf("could not retrieve size of type '%T'", value)
}