package main

import (
	"encoding/json"
	"fmt"
	"os"
)

type Configuration struct {
	ListenAddress string    `json:"listen-address"`
	Processes     []Process `json:"processes"`
}

func LoadConfiguration(path string) (conf *Configuration, err error) {
	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	conf = &Configuration{}

	if err := json.NewDecoder(f).Decode(conf); err != nil {
		return nil, err
	}

	for i := 0; i < len(conf.Processes); i++ {
		if conf.Processes[i].Process == "" {
			return nil, fmt.Errorf("an empty process field found")
		}

		if conf.Processes[i].Alias == "" {
			conf.Processes[i].Alias = conf.Processes[i].Process
		}
	}

	return conf, nil
}