//go:build !windows

package main

import (
	"os"
	"os/exec"
)

// fatalBox says why OpsLog is not starting, as visibly as the desktop allows.
//
// It used to be one println. That goes to stderr, and a binary started from a
// file manager or a .desktop launcher has no stderr anybody will ever read — so
// the refusal that was carefully worded arrived as "I click it and nothing
// happens", which is the least useful thing a program can say.
//
// So: a real dialog when the desktop has one of the two tools that every
// distribution ships with its desktop task, and stderr regardless. Neither is
// required — the startup log has the same text, and nothing here is allowed to
// stop OpsLog from exiting.
func fatalBox(title, text string) {
	os.Stderr.WriteString(title + ": " + text + "\n")
	for _, c := range [][]string{
		{"zenity", "--error", "--no-wrap", "--title", title, "--text", text},
		{"kdialog", "--title", title, "--error", text},
		// Neither is a hard requirement, and on a headless box there is nothing
		// to show a dialog on anyway.
	} {
		if _, err := exec.LookPath(c[0]); err != nil {
			continue
		}
		cmd := exec.Command(c[0], c[1:]...)
		if err := cmd.Start(); err != nil {
			continue
		}
		_ = cmd.Wait()
		return
	}
}