// Copyright 2016 Marapongo, Inc. All rights reserved.

package encoding

import (
	"encoding/json"

	"github.com/ghodss/yaml"
)

// Exts contains a list of all the valid marshalable extension types.
var Exts = []string{
	".json",
	".yaml",
	// Although ".yml" is not a sanctioned YAML extension, it is used quite broadly; so we will support it.
	".yml",
}

// Marshalers is a map of extension to a Marshaler object for that extension.
var Marshalers map[string]Marshaler

// Marshaler is a type that knows how to marshal and unmarshal data in one format.
type Marshaler interface {
	Marshal(v interface{}) ([]byte, error)
	Unmarshal(data []byte, v interface{}) error
}

var JSON Marshaler = &jsonMarshaler{}

type jsonMarshaler struct {
}

func (m *jsonMarshaler) Marshal(v interface{}) ([]byte, error) {
	return json.Marshal(v)
}

func (m *jsonMarshaler) Unmarshal(data []byte, v interface{}) error {
	// TODO: use a "strict" marshaler, so that we can warn on unrecognized keys (avoiding silly mistakes).  We should
	//     set aside an officially sanctioned area in the metadata for extensibility by 3rd parties.
	return json.Unmarshal(data, v)
}

var YAML Marshaler = &yamlMarshaler{}

type yamlMarshaler struct {
}

func (m *yamlMarshaler) Marshal(v interface{}) ([]byte, error) {
	return yaml.Marshal(v)
}

func (m *yamlMarshaler) Unmarshal(data []byte, v interface{}) error {
	// TODO: use a "strict" marshaler, so that we can warn on unrecognized keys (avoiding silly mistakes).  We should
	//     set aside an officially sanctioned area in the metadata for extensibility by 3rd parties.
	return yaml.Unmarshal(data, v)
}