package virtbuf

import (
	"errors"
	"fmt"
	"time"

	"github.com/google/uuid"
	"go.wit.com/log"
)

func (c *Cluster) InitDroplet(hostname string) (*Droplet, error) {
	var d *Droplet
	d = new(Droplet)
	d.Current = new(Current)

	d = c.FindDropletByName(hostname)
	if d != nil {
		return d, errors.New("duplicate hostname: " + hostname)
	}
	d.Hostname = hostname
	// d.Uuid = uuid.New() // not appropriate here

	// set some defaults
	d.StartState = DropletState_OFF
	d.Current.State = DropletState_UNKNOWN
	c.appendDroplet(d)
	return d, nil
}

func (c *Cluster) appendDroplet(d *Droplet) {
	c.Lock()
	defer c.Unlock()

	c.d.Droplets = append(c.d.Droplets, d)
}

// can the json protobuf output use a string and have a type handler
// to convert it back to int64?
func SetGB(gb int) int64 {
	return int64(gb * 1024 * 1024 * 1024)
}

func SetMB(mb int) int64 {
	return int64(mb * 1024 * 1024)
}

func (x *Hypervisor) SetMemoryGB(gb int) {
	x.Memory = int64(gb * 1024 * 1024 * 1024)
}

func (c *Cluster) FindDropletByName(name string) *Droplet {
	loop := c.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		if d.Hostname == name {
			return d
		}
	}
	return nil
}

func (c *Cluster) FindHypervisorByName(name string) *Hypervisor {
	for _, h := range c.H.Hypervisors {
		if h.Hostname == name {
			return h
		}
	}
	return nil
}

func (c *Cluster) AddHypervisor(hostname string, cpus int, mem int) *Hypervisor {
	h := c.FindHypervisorByName(hostname)
	if h != nil {
		return h
	}
	// Generate a new UUID
	id := uuid.New()
	h = &Hypervisor{
		Uuid:     id.String(),
		Hostname: hostname,
		Cpus:     int64(cpus),
		Comment:  "this is a fake hypervisor",
	}
	if cpus < 0 {
		h.Cpus = 1
	}
	h.SetMemoryGB(mem * 32)
	c.H.Hypervisors = append(c.H.Hypervisors, h)
	return h
}

func (c *Cluster) AddEvent(e *Event) {
	c.e.Events = append(c.e.Events, e)
}

func (c *Cluster) AddDroplet(d *Droplet) {
	c.d.Droplets = append(c.d.Droplets, d)
}

func (c *Cluster) AddDropletSimple(uuid string, hostname string, cpus int, mem int) *Droplet {
	d := c.FindDropletByName(hostname)
	if d != nil {
		return d
	}

	d = &Droplet{
		Uuid:     uuid,
		Hostname: hostname,
		Cpus:     int64(cpus),
	}

	if cpus < 0 {
		d.Cpus = 1
	}
	d.Memory = SetGB(mem * 32)
	d.StartState = DropletState_OFF
	c.AddDroplet(d)
	return d
}

// This isn't for the marketing department
func (c *Cluster) AddDropletLocal(name string, hypername string) *Droplet {
	d := &Droplet{
		Hostname: name,
	}
	d.LocalOnly = "yes on: " + hypername

	// by default, on locally imported domains, set the preferred hypervisor!
	d.PreferredHypervisor = hypername

	d.Current = new(Current)
	d.Current.Hypervisor = hypername
	d.StartState = DropletState_OFF
	d.Current.State = DropletState_OFF

	c.AddDroplet(d)
	return d
}

func (c *Cluster) BlankFields() {
	loop := c.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		d.Current = nil
	}
}

func (epb *Events) AppendEvent(e *Event) {
	epb.Events = append(epb.Events, e)
}

func (c *Cluster) ClusterStable() (bool, string) {
	last := time.Since(c.Unstable.AsTime())
	if last > c.UnstableTimeout.AsDuration() {
		// the cluster has not been stable for 133 seconds
		log.Warn("clusterReady() is stable for ", FormatDuration(c.UnstableTimeout.AsDuration()), " secs")
		return true, fmt.Sprintln("clusterReady() is stable ", FormatDuration(c.UnstableTimeout.AsDuration()), " secs")
	}
	log.Warn("clusterReady() is unstable for", FormatDuration(last))
	return false, "clusterReady() is unstable for " + FormatDuration(last)
}

// check the cluster and droplet to make sure it's ready to start
func (c *Cluster) DropletReady(d *Droplet) (bool, string) {
	if c == nil {
		return false, "cluster == nil"
	}
	if d == nil {
		return false, "droplet == nil"
	}
	if d.Current == nil {
		return false, "droplet.Current == nil"
	}
	// can't start already started droplet
	if d.Current.State == DropletState_ON {
		return false, "EVENT start droplet is already ON"
	}
	if d.Current.State != DropletState_OFF {
		return false, "EVENT start droplet is not OFF state = " + string(d.Current.State)
	}
	if d.Current.StartAttempts > 2 {
		// reason := "EVENT start droplet has already been started " + d.starts + " times"
		return false, fmt.Sprintln("EVENT start droplet has already been started ", d.Current.StartAttempts, " times")
	}
	return true, ""
}