package main

import (
	"encoding/json"
	"io/ioutil"
	"log"
	"os"
	"time"
)

const CLIENT_TYPE_CPP = "cpp"
const CLIENT_TYPE_WEB = "Web"
const CLIENT_TYPE_FASTLINK_UI = "fastlink_ui"
const CLIENT_TYPE_FASTLINK_SERVICE = "fastlink_service"
const TOKEN_TYPE_APP = "app"
const TOKEN_TYPE_PC = "pc"
const TOKEN_PC_MAX_LIFE = 3600
const TOKEN_APP_MAX_LIFE = 86400
const WEB_URL = "https://fastlink.evan.run/"

var (
	Logger          *log.Logger
	fastLinkService *FastLinkService
	globalConfig    = GlobalConfig{
		SignalServer: "https://fastlink.evan.run",
		StunServers:  []string{"stun:106.54.197.45:3478"},
		TurnServers: []TurnServer{{
			Addr:     "turn:106.54.197.45:3478",
			Password: "evanturn",
			UserName: "evan",
		}, {
			Addr:     "turn:221.229.220.67:3478",
			Password: "evanturn",
			UserName: "evan",
		}},
	}
	configPath   string
	LastDeviceId                = 0
	TimeLocation *time.Location = time.FixedZone("CST", 8*3600)
)

type GlobalConfig struct {
	SignalServer string       `json:"signalServer"`
	StunServers  []string     `json:"stunServers"`
	TurnServers  []TurnServer `json:"turnServers"`
}

type TurnServer struct {
	Addr     string `json:"addr"`
	Password string `json:"password"`
	UserName string `json:"userName"`
}

type ConfigData struct {
	LastDeviceId int           `json:"lastDeviceId"`
	Users        []*UserInfo   `json:"users"`
	Devices      []*DeviceInfo `json:"devices"`
	Tokens       []*TokenInfo  `json:"tokens"`
}

func SaveConfig() {
	config := &ConfigData{
		Users:        fastLinkService.Users,
		Devices:      fastLinkService.Devices,
		Tokens:       fastLinkService.Tokens,
		LastDeviceId: LastDeviceId,
	}
	marshal, _ := json.Marshal(config)
	ioutil.WriteFile(configPath, marshal, 0777)
}

func ReadConfig() {
	b, _ := exists(configPath)
	if b {
		configData, _ := ioutil.ReadFile(configPath)
		var config *ConfigData
		json.Unmarshal(configData, &config)
		fastLinkService.FillUsers(config.Users)
		fastLinkService.FillDevices(config.Devices)
		fastLinkService.FillTokens(config.Tokens)
		LastDeviceId = config.LastDeviceId
	}
}

func exists(path string) (bool, error) {
	_, err := os.Stat(path)
	if err == nil {
		return true, nil
	}
	if os.IsNotExist(err) {
		return false, nil
	}
	return true, err
}