package plugin

import (
	"fmt"
	"strings"
)

// Name is a reference to the plugin.  Places where it appears include JSON files as type of field `Plugin`.
type Name string

// GetLookupAndType returns the plugin name for lookup and sub-type supported by the plugin.
// The name follows a microformat of $plugin[/$subtype] where $plugin is used for the discovery / lookup by name.
// The $subtype is used for the Type parameter in the RPC requests.
// Example: instance-file/json means lookup socket file 'instance-file' and the type is 'json'.
func (r Name) GetLookupAndType() (string, string) {
	name := string(r)
	if first := strings.Index(name, "/"); first >= 0 {
		return name[0:first], name[first+1:]
	}
	return name, ""
}

// String returns the string representation
func (r Name) String() string {
	return string(r)
}

// MarshalJSON implements the JSON marshaler interface
func (r Name) MarshalJSON() ([]byte, error) {
	return []byte(fmt.Sprintf(`"%s"`, r.String())), nil
}

// UnmarshalJSON implements the JSON unmarshaler interface
func (r *Name) UnmarshalJSON(data []byte) error {
	str := string(data)
	start := strings.Index(str, "\"")
	last := strings.LastIndex(str, "\"")
	if start == 0 && last == len(str)-1 {
		str = str[start+1 : last]
	} else {
		return fmt.Errorf("bad-format-for-name:%v", string(data))
	}
	*r = Name(str)
	return nil
}