package config

import (
	"errors"
	"os"
	"path/filepath"
	"strconv"
	"time"
)

type Config struct {
	TelegramToken   string
	DatabasePath    string
	CodexSocketPath string
	UploadDir       string
	DefaultModel    string
	DefaultSandbox  string
	PollTimeout     time.Duration
	AppVersion      string
}

func Load() (Config, error) {
	wd, err := os.Getwd()
	if err != nil {
		return Config{}, err
	}

	cfg := Config{
		TelegramToken:   os.Getenv("TELEGRAM_BOT_TOKEN"),
		DatabasePath:    envOr("DB_PATH", filepath.Join(wd, "data", "bot.db")),
		CodexSocketPath: envOr("HOST_CODEX_SOCKET", filepath.Join(wd, "run", "codex.sock")),
		UploadDir:       envOr("HOST_UPLOAD_DIR", filepath.Join(wd, "uploads")),
		DefaultModel:    os.Getenv("DEFAULT_MODEL"),
		DefaultSandbox:  envOr("DEFAULT_SANDBOX", "workspace-write"),
		PollTimeout:     durationSeconds("POLL_TIMEOUT_SECONDS", 30),
		AppVersion:      envOr("APP_VERSION", "0.1.0"),
	}
	if cfg.TelegramToken == "" {
		return Config{}, errors.New("TELEGRAM_BOT_TOKEN is required")
	}
	return cfg, nil
}

func envOr(key, fallback string) string {
	if value := os.Getenv(key); value != "" {
		return value
	}
	return fallback
}

func durationSeconds(key string, fallback int) time.Duration {
	raw := os.Getenv(key)
	if raw == "" {
		return time.Duration(fallback) * time.Second
	}
	value, err := strconv.Atoi(raw)
	if err != nil || value <= 0 {
		return time.Duration(fallback) * time.Second
	}
	return time.Duration(value) * time.Second
}