package config_test

import (
	"os"
	"path/filepath"
	"strings"
	"testing"

	"git.wntrmute.dev/kyle/crossbar/internal/config"
)

// A file that exists but cannot be read is an error, and not a validation error: nothing about
// the configuration has been judged. Only a missing file is "absent" (and that is an error too).
func TestUnreadableFileIsAnError(t *testing.T) {
	if os.Geteuid() == 0 {
		t.Skip("root can read a 000 file")
	}
	dir := t.TempDir()
	path := filepath.Join(dir, "crossbar.toml")
	good, err := os.ReadFile(filepath.Join("testdata", "good.toml"))
	if err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(path, good, 0o000); err != nil {
		t.Fatal(err)
	}
	_, err = config.Load(path)
	if err == nil {
		t.Fatal("Load on an unreadable file must fail")
	}
	if _, ok := config.IsError(err); ok {
		t.Errorf("an unreadable file is not a validation *Error: %v", err)
	}
	if !strings.HasPrefix(err.Error(), "config: ") {
		t.Errorf("Error() = %q, want the config: prefix", err.Error())
	}
}

func TestDirectoryIsAnError(t *testing.T) {
	_, err := config.Load(t.TempDir())
	if err == nil {
		t.Fatal("Load on a directory must fail")
	}
	if _, ok := config.IsError(err); ok {
		t.Errorf("a directory is not a validation *Error: %v", err)
	}
}