package config

import (
	"fmt"
	"os"
	"path"

	"github.com/pelletier/go-toml/v2"
)

type (
	TwitchConfig struct {
		ChannelName string `toml:"channel_name"`
		ClientID string `toml:"client_id"`
		ClientSecret string `toml:"client_secret"`
	}

	Config struct {
		Host string `toml:"host"`
		Port int16 `toml:"port"`
		Twitch TwitchConfig `toml:"twitch"`
	}
)

var CONFIG_DIR = func() string {
	baseDir, _ := os.UserConfigDir()
	dir := path.Join(baseDir, "ari-stream-tools")
	if err := os.MkdirAll(dir, 0750); err != nil { panic(err) }
	return dir
}()
var configFilePath = path.Join(CONFIG_DIR, "config.toml")

var DEFAULT_HOST string = "127.0.0.1"
var DEFAULT_PORT int16 = 8080

func DefaultConfig() *Config {
	return &Config{
		Host: DEFAULT_HOST,
		Port: DEFAULT_PORT,
		Twitch: TwitchConfig{
			ChannelName: "",
			ClientID: "",
			ClientSecret: "",
		},
	}
}

func LoadConfig() (*Config, error) {
	configFile, err := os.OpenFile(configFilePath, os.O_CREATE | os.O_RDWR, 0600)
	if err != nil { return nil, fmt.Errorf("open %s: %v", configFilePath, err) }
	defer configFile.Close()

	config := DefaultConfig()
	if stat, err := configFile.Stat(); err != nil {
		return nil, fmt.Errorf("stat %s: %v", configFilePath, err)
	} else if stat.Size() == 0 {
		if err := toml.NewEncoder(configFile).Encode(config); err != nil {
			return nil, fmt.Errorf("write %s: %v", configFilePath, err)
		}
		return config, nil
	}

	if err := toml.NewDecoder(configFile).Decode(config); err != nil {
		return nil, fmt.Errorf("read %s: %v", configFilePath, err)
	}
	return config, nil
}