package kea

import "fmt"

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"),
	}})
}

// EntrypointDHCP4 is the kea-dhcp4 container entrypoint. It derives this pod's
// HA peer name from the StatefulSet ordinal, substitutes the placeholder in the
// projected config, and execs the server.
func EntrypointDHCP4() string {
	return fmt.Sprintf(`#!/bin/sh
set -e
ORD="${HOSTNAME##*-}"
mkdir -p %[1]s
chmod 0750 %[1]s
sed "s/%[2]s/server${ORD}/g" %[3]s/kea-dhcp4.conf > %[4]s
exec %[5]s -c %[4]s
`, RunDir, ThisServerPlaceholder, ConfigDir, DHCP4ConfPath, DHCP4Bin)
}

// EntrypointCtrlAgent is the kea-ctrl-agent container entrypoint.
func EntrypointCtrlAgent() string {
	return fmt.Sprintf(`#!/bin/sh
set -e
mkdir -p %[1]s
chmod 0750 %[1]s
cp %[2]s/kea-ctrl-agent.conf %[3]s
exec %[4]s -c %[3]s
`, RunDir, ConfigDir, CtrlAgentConfPath, CtrlAgentBin)
}