// Package model holds the provisioning data model bootapi renders templates
// against. A Host is the normalized view of a NetBox device: enough to build a
// kickstart and an iPXE boot script without the template author needing to know
// anything about NetBox's API shapes.
package model

// Host is the fully-resolved provisioning view of a single machine.
//
// Every field here is safe to reference from a kickstart or iPXE template. The
// zero value of a field means "NetBox did not provide it"; templates should
// guard optional fields (e.g. Gateway) accordingly.
type Host struct {
	// Hostname is the short name (NetBox device name), e.g. "web01".
	Hostname string
	// Domain is the DNS domain the host lives in, e.g. "syd1.au.unkin.net".
	Domain string
	// FQDN is Hostname joined to Domain when a domain is known, else Hostname.
	FQDN string

	// Platform is the NetBox platform slug, e.g. "almalinux9". It is the
	// primary template-selection key.
	Platform string
	// OSFamily is a coarse family derived from Platform ("almalinux",
	// "fedora", "rocky", ...). Handy for shared template logic.
	OSFamily string
	// OSVersion is the major version string when derivable, e.g. "9".
	OSVersion string
	// Arch is the CPU architecture, defaulting to "x86_64".
	Arch string

	// Role is the NetBox device role slug, e.g. "kubernetes-worker". Available
	// as a secondary template-selection key and for %post logic.
	Role string

	// Interfaces are the host's network interfaces, primary first.
	Interfaces []Interface

	// PrimaryIP is the address of the primary interface (no prefix length),
	// e.g. "10.0.1.20". Empty when NetBox has no primary IP set.
	PrimaryIP string

	// Nameservers are DNS resolvers to configure, when NetBox provides them
	// (via a custom field); otherwise empty and templates fall back to a
	// site default.
	Nameservers []string

	// RootPasswordHash is a crypt(3) hash for the root account, sourced at
	// render time (env/Vault), NOT stored in NetBox. Empty means "locked
	// account / template default".
	RootPasswordHash string

	// SSHAuthorizedKeys are public keys to install for root, sourced at render
	// time. Empty means none.
	SSHAuthorizedKeys []string

	// TemplateOverride, when non-empty, names the template to use verbatim,
	// bypassing platform/role selection. Sourced from a NetBox custom field.
	TemplateOverride string

	// Custom carries every NetBox custom field verbatim so templates can read
	// site-specific knobs without a code change. Keys are the custom-field
	// names as defined in NetBox.
	Custom map[string]any
}

// Interface is one network interface of a Host.
type Interface struct {
	// Name is the NetBox interface name, e.g. "eth0" / "bond0".
	Name string
	// MAC is the normalized (lower-case, colon-separated) hardware address.
	MAC string
	// IP is the interface address without prefix, e.g. "10.0.1.20". Empty for
	// interfaces with no assigned address.
	IP string
	// PrefixLen is the CIDR prefix length of IP, e.g. 24. Zero when unknown.
	PrefixLen int
	// Netmask is the dotted-quad form of PrefixLen, e.g. "255.255.255.0".
	Netmask string
	// Gateway is the default gateway for this interface's prefix, when NetBox
	// records one on the prefix. Empty otherwise.
	Gateway string
	// VLAN is the untagged VLAN id of the interface, or 0 when none.
	VLAN int
	// Primary reports whether this interface holds the device's primary IP.
	Primary bool
}

// PrimaryInterface returns the primary interface (the one carrying the primary
// IP), falling back to the first interface, or nil when there are none.
func (h *Host) PrimaryInterface() *Interface {
	for i := range h.Interfaces {
		if h.Interfaces[i].Primary {
			return &h.Interfaces[i]
		}
	}
	if len(h.Interfaces) > 0 {
		return &h.Interfaces[0]
	}
	return nil
}