package kea

import _ "embed"

type ctrlAgentRoot struct {
	ControlAgent controlAgent `json:"Control-agent"`
}

type controlAgent struct {
	HTTPHost       string                    `json:"http-host"`
	HTTPPort       int                       `json:"http-port"`
	ControlSockets map[string]map[string]any `json:"control-sockets"`
	Loggers        []logger                  `json:"loggers"`
}

// RenderCtrlAgent renders the deterministic kea-ctrl-agent.conf JSON. The
// control agent exposes the HA/REST control channel on CtrlAgentPort and
// forwards to kea-dhcp4 over the shared unix socket.
func RenderCtrlAgent() (string, error) {
	return marshal(ctrlAgentRoot{ControlAgent: controlAgent{
		HTTPHost: "0.0.0.0",
		HTTPPort: CtrlAgentPort,
		ControlSockets: map[string]map[string]any{
			"dhcp4": {"socket-type": "unix", "socket-name": CtrlSocketPath},
		},
		Loggers: loggers("kea-ctrl-agent"),
	}})
}

// initScript is the initContainer entrypoint. It is a committed, shellcheck-clean
// shell file (no fmt.Sprintf interpolation) parameterised entirely by the
// environment variables the operator sets on the initContainer. It prepares the
// shared run dir, finalises this pod's kea-dhcp4 config from the StatefulSet
// ordinal, and bounded-waits for the HA peer DNS to resolve before the main
// kea-dhcp4 / kea-ctrl-agent containers exec kea directly.
//
//go:embed scripts/init.sh
var initScript string

// InitScript returns the initContainer entrypoint shell script.
func InitScript() string { return initScript }