package sacred

import (
	"encoding/json"
	"encoding/xml"
)

// M is a shortcut for map[string]interface{}
type M map[string]interface{}

// NewM make map[string]interface{}
func NewM() M {
	return make(map[string]interface{})
}

// Set key-value to map[string]interface{}
func (m M) Set(k string, v interface{}) {
	m[k] = v
}

// Get value from map[string]interface{}
func (m M) Get(k string) (v interface{}, ok bool) {
	v, ok = m[k]
	return
}

// String map to json string
func (m M) String() string {
	bs, _ := json.Marshal(m)
	return string(bs)
}

// Bytes map to json bytes
func (m M) Bytes() []byte {
	bs, _ := json.Marshal(m)
	return bs
}

// MarshalXML allows type Map to be used with xml.Marshal.
func (m M) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	start.Name = xml.Name{
		Space: "",
		Local: "map",
	}
	if err := e.EncodeToken(start); err != nil {
		return err
	}
	for key, value := range m {
		elem := xml.StartElement{
			Name: xml.Name{Space: "", Local: key},
			Attr: []xml.Attr{},
		}
		if err := e.EncodeElement(value, elem); err != nil {
			return err
		}
	}

	return e.EncodeToken(xml.EndElement{Name: start.Name})
}