package config

import (
	"fmt"
	"os"
	"strings"
)

type Config struct {
	ListenAddr     string
	DatabaseURL    string
	AuthDBPath     string
	JWTSecret      []byte
	TushareAPIURL  string
}

func Load() (*Config, error) {
	cfg := &Config{
		ListenAddr:    getenv("LISTEN_ADDR", ":8080"),
		DatabaseURL:   os.Getenv("DATABASE_URL"),
		AuthDBPath:    getenv("AUTH_DB_PATH", "/app/auth/auth.db"),
		TushareAPIURL: getenv("TUSHARE_API_URL", "http://tushare:8000"),
	}
	if cfg.DatabaseURL == "" {
		return nil, fmt.Errorf("DATABASE_URL 环境变量未设置")
	}
	secret := strings.TrimSpace(os.Getenv("JWT_SECRET"))
	if len(secret) < 16 {
		return nil, fmt.Errorf("JWT_SECRET 必须至少 16 个字符 (建议 openssl rand -hex 32)")
	}
	cfg.JWTSecret = []byte(secret)
	return cfg, nil
}

func getenv(key, fallback string) string {
	if v, ok := os.LookupEnv(key); ok && v != "" {
		return v
	}
	return fallback
}