// Package kvm implements the provider contract on libvirt/KVM hypervisors.
// Each configured host is reached over SSH with the libvirt unix socket
// forwarded through the connection, so the hypervisors need no libvirtd TCP
// or TLS listener and the operator image needs no libvirt libraries. VMs
// boot a stock cloud image (fetched into the host's storage pool on first
// use) through a qcow2 overlay, with the Proxy's cloud-init delivered on a
// NoCloud seed ISO built in-process.
package kvm

import "gitea.home.hrajfrisbee.cz/kacerr/egress-proxies-operator/internal/provider"

const (
	defaultDiskSizeGB = 10
	defaultSocket     = "/var/run/libvirt/libvirt-sock"
	defaultPool       = "default"
	formatQcow2       = "qcow2"
	formatRaw         = "raw"
)

func withDefaults(cfg provider.KVMConfig) provider.KVMConfig {
	if cfg.DiskSizeGB == 0 {
		cfg.DiskSizeGB = defaultDiskSizeGB
	}
	if cfg.VendorData == "" {
		cfg.VendorData = defaultVendorData
	}
	images := make(map[string]provider.KVMImage, len(cfg.Images))
	for k, img := range cfg.Images {
		if img.Format == "" {
			img.Format = formatQcow2
		}
		images[k] = img
	}
	cfg.Images = images
	hosts := make([]provider.KVMHost, len(cfg.Hosts))
	for i, h := range cfg.Hosts {
		if h.Socket == "" {
			h.Socket = defaultSocket
		}
		if h.Pool == "" {
			h.Pool = defaultPool
		}
		hosts[i] = h
	}
	cfg.Hosts = hosts
	return cfg
}