package config

import (
	"bytes"
	"errors"
	"io/ioutil"
	"log"
	"os"

	"github.com/BurntSushi/toml"
)

// Config main type
type Config struct {
	Features Features
	Web      Web
	Twitter  Twitter
	Telegram Telegram
	Database Database
}

// Twitter related config
type Twitter struct {
	ConsumerKey    string
	ConsumerSecret string
	AccessKey      string
	AccessSecret   string
	MagicHashtag   string
}

// Telegram related config
type Telegram struct {
	APIKey string
}

// Database related config
type Database struct {
	Dialect    string
	Connection string
}

// Web related config
type Web struct {
	BindUnix bool
	Bind     string
	WebDir   string
}

// Features related config
type Features struct {
	Bot bool
	Web bool
}

// C holds the loaded configuration
var C Config

// LoadDefaults puts default values into C
func LoadDefaults() {
	C.Features.Bot = true
	C.Features.Web = true

	C.Web.BindUnix = false
	C.Web.Bind = ":8080"
	C.Web.WebDir = "./web"

	C.Twitter.AccessKey = "ACCESSKEY"
	C.Twitter.AccessSecret = "ACCESSSECRET"
	C.Twitter.ConsumerKey = "CONSUMERKEY"
	C.Twitter.ConsumerSecret = "CONSUMERSECRET"
	C.Twitter.MagicHashtag = "#DB640"

	C.Telegram.APIKey = "APIKEY"

	C.Database.Dialect = "sqlite3"
	C.Database.Connection = ":memory:"
}

// LoadConfig loads the configuration from given path
func LoadConfig(path string) error {
	LoadDefaults()
	_, err := toml.DecodeFile(path, &C)
	if errors.Is(err, os.ErrNotExist) {
		log.Printf("Could not find file \"%s\", using defaults!", path)
		LoadDefaults()
		err = WriteConfig(path)
		return err
	}
	return err
}

// WriteConfig writes the configuration to the given path
func WriteConfig(path string) error {
	buf := new(bytes.Buffer)
	err := toml.NewEncoder(buf).Encode(C)
	if err != nil {
		return err
	}
	err = ioutil.WriteFile(path, buf.Bytes(), 0644)
	return err
}