package main

import (
	"encoding/xml"
)

// ProcessList is a map of processes' statuses.
type ProcessList map[string]bool

// NewProcessList returns a ProcessList with initialised map.
func NewProcessList() *ProcessList {
	pl := make(ProcessList)
	return &pl
}

// AddProcess appends a process to a ProcessList
func (pl *ProcessList) AddProcess(name string, isup bool) {
	(*pl)[name] = isup
}

// ProcessXMLEntry is a XML representation of a process stored in ProcessList.
type ProcessXMLEntry struct {
	XMLName xml.Name
	Name    string `xml:"name,attr"`
	IsUp    bool   `xml:",chardata"`
}

// MarshalXML implements Marshaler interface for a ProcessList.
func (l ProcessList) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
	if len(l) == 0 {
		return nil
	}

	if err := e.EncodeToken(start); err != nil {
		return err
	}

	for key, val := range l {
		e.Encode(ProcessXMLEntry{
			XMLName: xml.Name{Local: "Process"},
			Name:    key,
			IsUp:    val})
	}

	return e.EncodeToken(start.End())
}