package cli

import (
	"fmt"
	"reflect"

	"git.maximhutz.com/max/lambda/pkg/codec"
)

type Marshaler interface {
	codec.Marshaler[Repr]

	InType() string
}

type convertedMarshaler[T any] struct {
	codec  codec.Marshaler[T]
	inType string
}

func (c convertedMarshaler[T]) Decode(s string) (Repr, error) {
	t, err := c.codec.Decode(s)
	if err != nil {
		return nil, err
	}

	return NewRepr(c.inType, t), nil
}

func (c convertedMarshaler[T]) Encode(r Repr) (string, error) {
	t, ok := r.Data().(T)
	if !ok {
		dataType := reflect.TypeOf(r.Data())
		allowedType := reflect.TypeFor[T]()
		return "", fmt.Errorf("marshaler for '%s' cannot parse '%s'", allowedType, dataType)
	}

	return c.codec.Encode(t)
}

func (c convertedMarshaler[T]) InType() string { return c.inType }

func ConvertMarshaler[T any](e codec.Marshaler[T], inType string) Marshaler {
	return convertedMarshaler[T]{e, inType}
}