// Config: parse services.yaml

// SPDX-License-Identifier: GPL-3.0-or-later
// Copyright (C) 2021-2024  Simon Ruderich

package config

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

	"gopkg.in/yaml.v2"
)

func LoadServices(group string) ([]string, error) {
	path := filepath.Join(group, "services.yaml")

	var res []string
	x, err := os.ReadFile(path)
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, err
	}
	err = yaml.UnmarshalStrict(x, &res)
	if err != nil {
		return nil, fmt.Errorf("%s: failed to load: %v", path, err)
	}

	// Sanity checks
	for _, x := range res {
		if len(strings.Fields(x)) != 1 {
			return nil, fmt.Errorf(
				"%s: service name %q must not contain whitespace",
				path, x)
		}
	}

	return res, nil
}