package config

import (
	"flag"
	"os"
	"time"

	"github.com/ilyakaznacheev/cleanenv"
)

type Config struct {
	Env         string        `yaml:"env" env-required:"true"`
	StoragePath string        `yaml:"storage_path" env-required:"true"`
	TokenTTL    time.Duration `yaml:"token_ttl" env-default:"1h"`
	GRPC        struct {
		Port    int           `yaml:"port" env-default:"44044"`
		Timeout time.Duration `yaml:"timeout" env-default:"10s"`
	} `yaml:"grpc"`
}

func MustLoad() *Config {
	path := fetchConfigPath()
	if path == "" {
		panic("config path is empty")
	}

	return MustLoadByPath(path)
}

func MustLoadByPath(configPath string) *Config {
	if _, err := os.Stat(configPath); os.IsNotExist(err) {
		panic("config path does not exist: " + configPath)
	}

	var cfg Config
	if err := cleanenv.ReadConfig(configPath, &cfg); err != nil {
		panic(err)
	}

	return &cfg
}

func fetchConfigPath() string {
	var res string

	// --config="path/to/config.yaml"
	flag.StringVar(&res, "config", "", "path to config file")
	flag.Parse()

	if res == "" {
		res = os.Getenv("CONFIG_PATH")
	}

	return res
}