package main

/*
	validate / sanity check / consistancy check the data

	here is some code to do smart things like:

	* check mac addresses are unique
	* check uuid's are unique
	* double check filenames are unique
	* return a unique mac address
	* return a unique uuid

*/

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

	"github.com/google/uuid"

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

// will make sure the mac address is unique
func ValidateUniqueMac(mac string) bool {
	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		for _, n := range d.Networks {
			if n.Mac == mac {
				log.Info("duplicate MAC", n.Mac, "in droplet", d.Hostname)
				return false
			}
		}
	}
	return true
}

// records all the known paths. this should go in the protobuf
func addClusterFilepath(dir string) *pb.Event {
	var found bool = false
	var e *pb.Event
	for _, d := range me.cluster.Dirs {
		if d == dir {
			// found dir
			found = true
			break
		}
	}
	if !found {
		if dir != "." {
			// make a new Add Event
			e = pb.NewAddEvent(nil, "Add Cluster Directory", dir)
			me.cluster.Dirs = append(me.cluster.Dirs, dir)
		}
	}
	return e
}

// returns the droplet using a filename
func lookupFilename(filename string) *pb.Droplet {
	filebase := filepath.Base(filename)

	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		for _, disk := range d.Disks {
			if filebase == disk.Filename {
				return d
			}
		}
	}
	return nil
}

func ValidateUniqueFilenames() bool {
	var ok bool = true
	var disks map[string]string
	disks = make(map[string]string)

	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		for _, disk := range d.Disks {
			filename := disk.Filename
			addClusterFilepath(disk.Filepath)
			if _, ok := disks[filename]; ok {
				/*
					if argv.IgnDisk {
						log.Info("ignore dup disk", filename, disks[filename], d.Hostname)
					} else {
					}
				*/
				log.Info("file", filename, "on droplet", disks[filename])
				log.Info("file", filename, "on droplet", d.Hostname)
				log.Info("duplicate disk names (--xml-ignore-disk to ignore)")
				ok = false
			}
			disks[filename] = d.Hostname
		}
	}
	if ok {
		log.Println("validated okay: no duplicate disk images")
	}
	return ok
}

func ValidateDiskFilenames() ([]*pb.Event, error) {
	var alle []*pb.Event

	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		var found bool = false
		for _, disk := range d.Disks {
			filename := disk.Filename
			filebase := filepath.Base(filename)
			dir := filepath.Dir(filename)
			addClusterFilepath(dir)
			if disk.Filename != filebase {
				// update filename
				e := d.NewChangeEvent("Disk.Filename", disk.Filename, filebase)
				alle = append(alle, e)
				disk.Filename = filebase
			}
			// make sure the filename is the hostname + .qcow2
			filetype := filepath.Ext(filebase)
			if filetype == ".img" {
				found = true
				continue
			}
			if filetype != ".qcow2" {
				log.Info("file type", filetype, "not supported for", filebase, "on", d.Hostname)
				return nil, errors.New("only supporting qcow2 images for now")
			}
			test := strings.TrimSuffix(filebase, filetype)
			if test == d.Hostname {
				found = true
			}
			if dir == "." {
				continue
			}
			if dir == "" {
				continue
			}
			if disk.Filepath != dir {
				// update filename
				e := d.NewChangeEvent("Disk.Filepath", disk.Filepath, dir)
				alle = append(alle, e)
				disk.Filepath = dir
			}
		}
		if !found {
			log.Info("droplet", d.Hostname, d.Disks)
			return nil, errors.New("droplet " + d.Hostname + " has nonstandard disk names")
		}
	}
	return alle, nil
}

func getNewMac() string {
	// mac address map to check for duplicates
	var macs map[string]string
	macs = make(map[string]string)

	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		for _, n := range d.Networks {
			// log.Println("network:", n.Mac, d.Uuid, d.Hostname)
			if _, ok := macs[n.Mac]; ok {
				// UUID already exists
				log.Info("duplicate MAC", n.Mac, macs[n.Mac])
				log.Info("duplicate MAC", n.Mac, d.Hostname)
				return ""
			}
			macs[n.Mac] = d.Hostname
		}
	}

	var i int = 9
	var mac string
	for {
		mac = fmt.Sprintf("22:22:22:22:22:%02d", i)
		if _, ok := macs[mac]; ok {
			log.Info("MAC already defined", mac, macs[mac])
			i += 1
			continue
		}
		log.Info("using new MAC:", mac)
		return mac
	}
	return ""
}

// runs on startup. dies if there are duplicates
// the config file must then be edited by hand
func ValidateDroplets() (map[string]string, map[string]string, error) {
	// uuid map to check for duplicates
	var umap map[string]string
	umap = make(map[string]string)

	// mac address map to check for duplicates
	var macs map[string]string
	macs = make(map[string]string)

	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		// Generate a new UUID
		if d.Uuid == "" {
			u := uuid.New()
			d.Uuid = u.String()
		}

		// seconds, ok := timeZone[tz]; ok {
		if _, ok := umap[d.Uuid]; ok {
			// UUID already exists
			log.Info("duplicate UUID", d.Uuid, umap[d.Uuid])
			log.Info("duplicate UUID", d.Uuid, d.Hostname)
			return umap, macs, errors.New("duplicate UUID: " + d.Uuid)
		}
		umap[d.Uuid] = d.Hostname

		for _, n := range d.Networks {
			// log.Println("network:", n.Mac, d.Uuid, d.Hostname)
			if _, ok := macs[n.Mac]; ok {
				// UUID already exists
				log.Info("duplicate MAC", n.Mac, macs[n.Mac], umap[macs[n.Mac]])
				log.Info("duplicate MAC", n.Mac, d.Hostname)
				return umap, macs, errors.New("duplicate MAC: " + n.Mac)
			}
			macs[n.Mac] = d.Uuid
		}
	}
	log.Println("validated okay: no duplicate MAC addr")
	log.Println("validated okay: no duplicate UUID")

	return umap, macs, nil
}

func searchForDuplicateUUIDs() {
	// var broken int
}

/*
// remove from the slice
func deleteDroplet(bad int) {
	var all *pb.Droplets
	all = me.cluster.DeleteDroplet(b *db.Droplet)

	fmt.Println("deleting", bad, all.Droplets[bad].Hostname)

	// Check if the index is within bounds
	if bad >= 0 && bad < len(all.Droplets) {
		// Remove element at targetIndex
		all.Droplets = append(all.Droplets[:bad], all.Droplets[bad+1:]...)
	}
}
*/

// checks a droplet right before a start event
// verify ethernet mac address
// verify uuid (but probably can ignore this since it's not used)
// check qemu domain id
// check spice and vnc ports
// check filenames
func ValidateDroplet(check *pb.Droplet) error {
	// check for duplicate uuid's
	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		if check == d {
			continue
		}
		if d.Uuid == check.Uuid {
			// UUID already exists
			log.Info("duplicate UUID", d.Uuid, d.Hostname)
			log.Info("duplicate UUID", d.Uuid, check.Hostname)
			// d.Archive = new(pb.DropletArchive)
			if d.Archive == nil {
				log.Info("d.Archive == nil")
				os.Exit(-1)
			}
			d.Archive.Reason = pb.DropletArchive_DUP
			return errors.New("duplicate UUID: " + d.Uuid)
		}
	}

	// check for duplicate mac addresses
	for _, checkn := range check.Networks {
		loop := me.cluster.DropletsAll() // get the list of droplets
		for loop.Scan() {
			d := loop.Droplet()
			if check == d {
				continue
			}
			for _, n := range d.Networks {
				if checkn.Mac == n.Mac {
					// MAC already exists
					log.Info("duplicate MAC", n.Mac, d.Hostname)
					log.Info("duplicate MAC", n.Mac, check.Hostname)
					return errors.New("duplicate MAC: " + n.Mac)
				}
			}
		}
	}

	if err := setUniqueSpicePort(check); err != nil {
		return err
	}
	return nil
}

func setUniqueSpicePort(check *pb.Droplet) error {
	var ports map[int64]*pb.Droplet
	ports = make(map[int64]*pb.Droplet)

	// check spice ports
	//	checkn.SpicePort = getUniqueSpicePort()
	loop := me.cluster.DropletsAll() // get the list of droplets
	for loop.Scan() {
		d := loop.Droplet()
		if d.SpicePort == 0 {
			continue
		}
		if dup, ok := ports[d.SpicePort]; ok {
			// dup := ports[d.SpicePort]
			log.Warn("duplicate ports", d.SpicePort, d.Hostname, d.Current.State)
			if d.Current.State != pb.DropletState_ON {
				// hack for now. should be safe to erase this
				d.SpicePort = 0
				log.Warn("erasing port for non-ON droplet", d.SpicePort, d.Hostname, d.Current.State)
			}
			log.Warn("duplicate ports", dup.SpicePort, dup.Hostname, dup.Current.State)
			if dup.Current.State != pb.DropletState_ON {
				// hack for now. should be safe to erase this
				dup.SpicePort = 0
				log.Warn("erasing port for non-ON droplet", dup.SpicePort, dup.Hostname, dup.Current.State)
			}
			// todo: fix this somewhow
			return errors.New("duplicate ports")
		}
		ports[d.SpicePort] = d
	}

	for p, d := range ports {
		log.Info("found spice port", p, "on", d.Hostname)
	}

	var start int64
	start = 5910
	for {
		if start == 6000 {
			// x11 might use this on dom0's running a desktop
			// maybe qemu uses it iternally
			start += 1
			continue
		}
		if _, ok := ports[start]; ok {
			d := ports[start]
			log.Info("already using port", start, "on", d.Hostname)
			if d == check {
				log.Info("this is good because it's me!", check.Hostname, d.Hostname)
				return nil
			}
			start += 1
			continue
		}
		// generate change port event
		log.Info("going to try port", start, "on", check.Hostname)
		e := check.NewChangeEvent("SpicePort", check.SpicePort, start)
		me.cluster.AddEvent(e)

		// set port to start
		check.SpicePort = start

		// write out config file
		if err := me.cluster.ConfigSave(); err != nil {
			log.Info("config save error inside here is bad", err)
			return err
		}

		return nil
	}
	// for loop never gets here
	return nil
}