package config

import (
	"fmt"
	"os"
	"github.com/kelseyhightower/envconfig"
)

type Config struct {
	Bot    BotConfig
	N8n    N8nConfig
	Speech SpeechConfig
	Redis  RedisConfig
	Server ServerConfig
	Log    LogConfig
}

type BotConfig struct {
	Token      string `envconfig:"TELEGRAM_BOT_TOKEN" required:"true"`
	Mode       string `envconfig:"BOT_MODE"           default:"polling"`
	WebhookURL string `envconfig:"TELEGRAM_WEBHOOK_URL"`
	Debug      bool   `envconfig:"TELEGRAM_DEBUG"     default:"false"`
}

type N8nConfig struct {
	WebhookURL  string `envconfig:"N8N_WEBHOOK_URL" required:"true"`
	AuthToken   string `envconfig:"N8N_AUTH_TOKEN"`
	TimeoutSecs int    `envconfig:"N8N_TIMEOUT"     default:"30"`
	RetryCount  int    `envconfig:"N8N_RETRY_COUNT" default:"3"`
}

type SpeechConfig struct {
	Provider       string `envconfig:"STT_PROVIDER"        default:"openai"`
	OpenAIKey      string `envconfig:"OPENAI_API_KEY"`
	WhisperModel   string `envconfig:"WHISPER_MODEL"       default:"whisper-1"`
	Language       string `envconfig:"WHISPER_LANGUAGE"    default:""`
	FFmpegPath     string `envconfig:"FFMPEG_PATH"         default:"ffmpeg"`
	VoiceStorePath string `envconfig:"VOICE_STORE_PATH"    default:"/tmp/gw_telegram/voice"`
}

type RedisConfig struct {
	URL      string `envconfig:"REDIS_URL"   default:"redis://localhost:6379"`
	TTLHours int    `envconfig:"SESSION_TTL" default:"24"`
}

type ServerConfig struct {
	Port int `envconfig:"SERVER_PORT" default:"8080"`
}

type LogConfig struct {
	Level  string `envconfig:"LOG_LEVEL"  default:"info"`
	Format string `envconfig:"LOG_FORMAT" default:"json"`
}

func Load() (*Config, error) {
	var cfg Config
	if err := envconfig.Process("", &cfg); err != nil {
		return nil, fmt.Errorf("load config: %w", err)
	}
	return &cfg, nil
}

func MustLoad() *Config {
	cfg, err := Load()
	if err != nil {
		fmt.Fprintf(os.Stderr, "fatal: %v\n", err)
		os.Exit(1)
	}
	return cfg
}