package main

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"time"

	pb "go.wit.com/lib/protobuf/virtbuf"
	"go.wit.com/log"
)

var ErrorNoFile error = errors.New("missing file")
var ErrorParse error = errors.New("invalid json")

// something is wrong somewhere and sometimes the 
// protobuf json files get written out with garbage
func cfgfile() {
	err := readConfigFile("virtigo.json")
	if err == nil {
		return
	}
	if err == ErrorParse {
		os.Exit(-1)
	}
	err = readConfigFile("virtigo.json.last")
	if err == nil {
		log.Info("read json failed", err)
		os.Exit(-1)
	}
	if err == ErrorNoFile {
		log.Info("no config file created yet", err)
		os.Exit(-1)
	}
}

func readConfigFile(filename string) error {
	me.cluster = new(pb.Cluster)
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), filename)
	pfile, err := os.ReadFile(fullname)
	if err != nil {
		log.Info("open config file :", err)
		return ErrorNoFile
	}
	err = me.cluster.UnmarshalJSON(pfile)
	if err != nil {
		log.Info("read json failed", err)
		os.Exit(-1)
		return ErrorParse
	}

	// initialize each hypervisor
	for _, pbh := range me.cluster.Hypervisors {
		h := findHypervisor(pbh.Hostname)
		if h != nil {
			continue
		}
		// this is a new unknown droplet (not in the config file)
		h = new(HyperT)
		h.pb = pbh

		h.lastpoll = time.Now()

		me.hypers = append(me.hypers, h)
		log.Log(EVENT, "config new hypervisors", h.pb.Hostname)
	}

	// initialize values for each droplet
	for _, pbd := range me.cluster.Droplets {
		d := findDroplet(pbd.Hostname)
		if d != nil {
			continue
		}
		// this is a new unknown droplet (not in the config file)
		d = new(DropletT)
		d.pb = pbd
		me.droplets = append(me.droplets, d)
		log.Log(EVENT, "config new droplet", d.pb.Hostname, d.pb.StartState, d.pb.PreferredHypervisor)
	}

	return nil
}

func writeConfigFile() {
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json")
	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
	defer cfgfile.Close()
	if err != nil {
		log.Info("open config file :", err)
		return
	}
	json := me.cluster.FormatJSON()
	fmt.Fprintln(cfgfile, json)
	log.Info("Write:", fullname, "OK")
}

func writeConfigFileDroplets() {
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "droplets.text")
	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
	defer cfgfile.Close()
	if err != nil {
		log.Info("open config file :", err)
		return
	}
	// text := me.cluster.Droplets.FormatTEXT()
	text := me.cluster.FormatTEXT()
	fmt.Fprintln(cfgfile, text)
	log.Info("Write:", fullname, "OK")
}