package types

import (
	"bytes"
	"github.com/BurntSushi/toml"
	"net/http"
	logger2 "openai/logger"
	"openai/utils"
	"os"
)

type Config struct {
	Listen     string
	Session    Session
	ProxyURL   string
	Chat       Chat
	EnableAuth bool     // 是否开启鉴权
	Tokens     []string // 授权的白名单列表 TODO: 后期要存储到 LevelDB 或者 Mysql 数据库
}

// Chat configs struct
type Chat struct {
	ApiURL        string
	ApiKeys       []string
	Model         string
	Temperature   float32
	MaxTokens     int
	EnableContext bool // 是否保持聊天上下文
}

// Session configs struct
type Session struct {
	SecretKey string // session encryption key
	Name      string
	Path      string
	Domain    string
	MaxAge    int
	Secure    bool
	HttpOnly  bool
	SameSite  http.SameSite
}

func NewDefaultConfig() *Config {
	return &Config{
		Listen: "0.0.0.0:5678",

		Session: Session{
			SecretKey: utils.RandString(64),
			Name:      "CHAT_SESSION_ID",
			Domain:    "",
			Path:      "/",
			MaxAge:    86400,
			Secure:    true,
			HttpOnly:  false,
			SameSite:  http.SameSiteNoneMode,
		},
		Chat: Chat{
			ApiURL:        "https://api.openai.com/v1/chat/completions",
			ApiKeys:       []string{""},
			Model:         "gpt-3.5-turbo",
			MaxTokens:     1024,
			Temperature:   1.0,
			EnableContext: true,
		},
		EnableAuth: true,
	}
}

var logger = logger2.GetLogger()

func LoadConfig(configFile string) (*Config, error) {
	var config *Config
	_, err := os.Stat(configFile)
	if err != nil {
		logger.Errorf("Error open config file: %s", err.Error())
		config = NewDefaultConfig()
		// save config
		err := SaveConfig(config, configFile)
		if err != nil {
			return nil, err
		}

		return config, nil
	}
	_, err = toml.DecodeFile(configFile, &config)
	if err != nil {
		return nil, err
	}

	return config, err
}

func SaveConfig(config *Config, configFile string) error {
	buf := new(bytes.Buffer)
	encoder := toml.NewEncoder(buf)
	if err := encoder.Encode(&config); err != nil {
		return err
	}

	return os.WriteFile(configFile, buf.Bytes(), 0644)
}