package main

import (
	"flag"
	"github.com/BurntSushi/toml"
	"log"
	"os"
	"strconv"
)

var administrators map[string]bool

type conf struct {
	System  systemConf  `toml:"system"`
	Server  serverConf  `toml:"server"`
	Discord discordConf `toml:"discord"`
}

type serverConf struct {
	Host           string   `toml:"host"`
	Unix           bool     `toml:"unix"`
	Port           uint16   `toml:"port"`
	Proxy          bool     `toml:"proxy"`
	TrustedProxies []string `toml:"trusted_proxies"`
	BaseURL        string   `toml:"base_url"`
	Secret         string   `toml:"secret"`
}

type systemConf struct {
	Verbose bool   `toml:"verbose"`
	Store   string `toml:"store"`
}

type discordConf struct {
	ClientID       string `toml:"client_id"`
	ClientSecret   string `toml:"client_secret"`
	Administrators []int  `toml:"administrators"`
}

var (
	config   conf
	confPath string
	confRead = false
)

func init() {
	flag.StringVar(&confPath, "c", "server.conf", "specify path to configuration file")
}

func confLoad() {
	if confRead {
		panic("configuration read called when already read")
	}
	defer func() { confRead = true }()

	if meta, err := toml.DecodeFile(confPath, &config); err != nil {
		if !os.IsNotExist(err) {
			log.Fatalf("error parsing configuration: %s", err)
		}

		var file *os.File
		if file, err = os.Create(confPath); err != nil {
			log.Fatalf("error creating configuration file: %s", err)
		} else if err = toml.NewEncoder(file).Encode(defConf); err != nil {
			log.Fatalf("error generating default configuration: %s", err)
		}
		config = defConf
		return
	} else {
		for _, key := range meta.Undecoded() {
			log.Printf("unused key in configuration file: %s", key.String())
		}
	}

	if len(config.Discord.Administrators) != 0 && config.Discord.Administrators[0] != -1 {
		administrators = make(map[string]bool)

		for _, id := range config.Discord.Administrators {
			administrators[strconv.Itoa(id)] = true
		}
	}
}

var defConf = conf{
	System: systemConf{
		Verbose: false,
		Store:   "db",
	},
	Server: serverConf{
		Host:  "127.0.0.1",
		Unix:  false,
		Port:  7777,
		Proxy: true,
		TrustedProxies: []string{
			"10.0.0.0/8",
			"172.16.0.0/12",
			"192.168.0.0/16",
		},
		BaseURL: "http://localhost:7777/",
		Secret:  "RANDOM_STRING",
	},
	Discord: discordConf{
		ClientID:       "",
		ClientSecret:   "",
		Administrators: []int{-1},
	},
}