//go:build !windows

// service_other.go — non-Windows fallback for the service package.
// Linux uses systemd to wrap the agent; the binary itself just runs
// in the foreground. Run() therefore just executes the agent loop
// and returns. install/uninstall sub-commands return a clear error
// directing the operator at the install.sh + systemd unit shipped
// in deploy/install/.
package service

import (
	"context"
	"errors"
)

// AgentRun is the function-pointer shape main passes in. Same shape
// as the Windows variant so the call site is portable.
type AgentRun func(ctx context.Context) error

// Run executes the agent loop in the foreground; on Unix the
// systemd unit (or whatever runs us) supplies the lifecycle.
func Run(agentRun AgentRun) error {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	return agentRun(ctx)
}

// Install registers the agent as a service. Windows-only; on Unix
// the systemd unit covers this — returns an error pointing there.
func Install() error { return errUnsupported("install") }

// Uninstall is the inverse of Install. Windows-only.
func Uninstall() error { return errUnsupported("uninstall") }

// Start asks the OS service manager to start the installed service.
// Windows-only.
func Start() error { return errUnsupported("start") }

// Stop sends a stop signal to the installed service. Windows-only.
func Stop() error { return errUnsupported("stop") }

func errUnsupported(verb string) error {
	return errors.New("service " + verb + " is Windows-only; use the systemd unit on Linux")
}