// Package reflection helps Marshalling/Unmarshalling data to structs
package reflection

import (
	"reflect"
)

// Reflection provides Marshalling/Unmarshalling oriented view
// of a value
type Reflection[T any] struct {
	rv reflect.Value
	rt reflect.Type
}

// Value returns the object it reflects
func (r *Reflection[T]) Value() *T {
	return r.rv.Interface().(*T)
}

// New creates a Reflection of the given pointer
func New[T any](v *T) (*Reflection[T], error) {
	if v == nil {
		err := &InvalidUnmarshalError{Type: reflect.TypeOf(v)}
		return nil, err
	}

	r := &Reflection[T]{
		rv: reflect.ValueOf(v),
		rt: reflect.TypeOf(v),
	}

	if err := r.scan(); err != nil {
		return nil, err
	}
	return r, nil
}