// Copyright 2024 WIT.COM Inc Licensed GPL 3.0

package virtigolib

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

	"libvirt.org/go/libvirtxml"

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

// generate the XML for 'virsh create'
func GenerateDropletXml(dirs []string, d *pb.Droplet, domcfg *libvirtxml.Domain, hostname string) error {
	if d == nil {
		return errors.New("*droplet == nil")
	}
	domcfg.Type = "kvm"
	domcfg.Name = d.Hostname
	domcfg.UUID = d.Uuid

	var i uint
	i = uint(d.Memory / (1024 * 1024))

	// var tmp string
	// tmp = domcfg.VCPU
	domcfg.VCPU = new(libvirtxml.DomainVCPU)
	domcfg.VCPU.Value = uint(d.Cpus)

	domcfg.Memory = new(libvirtxml.DomainMemory)
	domcfg.Memory.Value = i
	domcfg.Memory.Unit = "MiB"

	fmt.Printf("Virt Memory %d %s\n", domcfg.Memory.Value, domcfg.Memory.Unit)

	// addEthernet(domcfg, "04:44:33:11:22:11", "worldbr")
	// addEthernet(domcfg, "04:44:33:33:44:55", "greenbr")

	var count int = 0
	for _, n := range d.Networks {
		log.Info("add network", d.Hostname, "mac addr", n.Mac, "interface", n.Name)
		if n.Name != "worldbr" {
			log.Info("OVERRIDE BRIDGE WITH 'worldbr'")
		}
		addEthernetBridge(domcfg, n.Mac, "worldbr")
		// addEthernetTap(domcfg, n.Mac)
		count += 1
	}
	if count == 1 {
		// this is normal
	} else {
		log.Info("WRONG NUMBER OF ETHERNET INTERFACES:", count)
	}

	// add a check here to make these unique
	// setRandomMacs(domcfg)

	if len(dirs) == 0 {
		dirs = append(dirs, "/var/lib/libvirt/images")
		dirs = append(dirs, "/home/nfs2")
		dirs = append(dirs, "/home/nfs3")
	}
	log.Info("Should look in dirs:", dirs)
	for _, disk := range d.Disks {
		fullname := findDisk(dirs, disk.Filename)
		if fullname == "" {
			log.Info("can not find disk", d.Hostname, "dir", disk.Filepath, "filename", disk.Filename)
			os.Exit(-1)
		} else {
			// qcow := "/home/nfs/" + d.Hostname + ".qcow2"
			setSimpleDisk(domcfg, fullname)
		}
	}

	return writeoutXml(domcfg, d.Hostname)
}

func findDisk(dirs []string, filename string) string {
	for _, dirname := range dirs {
		// log.Info("look in dir", dirname)
		var count int
		newdir, _ := os.ReadDir(dirname)
		for _, file := range newdir {
			count += 1
			if file.Name() == filename {
				log.Info("Found file", filename, "in", dirname)
				return filepath.Join(dirname, file.Name())
			}
		}
		if count == 0 {
			log.Info("Warning? dirname", dirname, "was empty. Not mounted?")
		}
	}
	return ""
}