package main

import (
	"fmt"
	"github.com/pelletier/go-toml"
	"os"
)

type Config struct {
	ServerPort uint16     `toml:"port"`
	RRConfigs  []RRConfig `toml:"rrconfig"`

	rrconfigs map[string]*RRConfig
}

type RRConfig struct {
	Username   string `toml:"username"`
	Password   string `toml:"password"`
	Nameserver string `toml:"nameserver"`
	Zonename   string `toml:"zonename"`
	Hostname   string `toml:"hostname"`
	Tsigkey    string `toml:"tsigkey"`
	Ttl        int    `toml:"ttl" default:"60"`
}

func LoadConfig(path string) (*Config, error) {
	var cfg Config

	f, err := os.Open(path)
	if err != nil {
		return nil, err
	}

	decoder := toml.NewDecoder(f).Strict(true)
	err = decoder.Decode(&cfg)
	if err != nil {
		return nil, err
	}

	cfg.rrconfigs = map[string]*RRConfig{}
	for _, entry := range cfg.RRConfigs {
		if _, ok := cfg.rrconfigs[entry.Username]; ok {
			return nil, fmt.Errorf("Duplicate username detected")
		}
		cfg.rrconfigs[entry.Username] = &entry
	}
	return &cfg, nil
}