package config

import (
	"errors"
	"os"
	"time"
)

type Config struct {
	AppEnv       string
	ServerPort   string
	PostgresDSN  string
	PasswordSalt string

	JwtSigningKey      string
	JwtAccessTokenTTL  time.Duration
	JwtRefreshTokenTTL time.Duration

	MailgunFrom         string
	MailgunDomain       string
	MailgunAPIKey       string
	VerficationTokenTTL time.Duration

	LogLevel    string
	LogFormat   string
	LogShowLine bool
}

func NewConfig() *Config {
	return &Config{
		AppEnv:       getenvOrDefault("APP_ENV", "debug"),
		ServerPort:   getenvOrDefault("SERVER_PORT", "3000"),
		PostgresDSN:  getenvOrDefault("POSTGRESQL_DSN", ""),
		PasswordSalt: getenvOrDefault("PASSWORD_SALT", ""),

		JwtSigningKey: getenvOrDefault("JWT_SIGNING_KEY", ""),
		JwtAccessTokenTTL: mustParseDurationOrPanic(
			getenvOrDefault("JWT_ACCESS_TOKEN_TTL", "15m"),
		),
		JwtRefreshTokenTTL: mustParseDurationOrPanic(
			getenvOrDefault("JWT_REFRESH_TOKEN_TTL", "24h"),
		),

		MailgunFrom:   getenvOrDefault("MAILGUN_FROM", ""),
		MailgunDomain: getenvOrDefault("MAILGUN_DOMAIN", ""),
		MailgunAPIKey: getenvOrDefault("MAILGUN_API_KEY", ""),
		VerficationTokenTTL: mustParseDurationOrPanic(
			getenvOrDefault("VERIFICATION_TOKEN_TTL", "24h"),
		),

		LogLevel:    getenvOrDefault("LOG_LEVEL", "debug"),
		LogFormat:   getenvOrDefault("LOG_FORMAT", "json"),
		LogShowLine: getenvOrDefault("LOG_SHOW_LINE", "true") == "true",
	}
}

func (c *Config) IsDevMode() bool {
	return c.AppEnv == "debug" || c.AppEnv == "test"
}

func getenvOrDefault(key, def string) string {
	if v, ok := os.LookupEnv(key); ok {
		return v
	}
	return def
}

func mustParseDurationOrPanic(dur string) time.Duration {
	d, err := time.ParseDuration(dur)
	if err != nil {
		panic(errors.Join(errors.New("cannot time.ParseDuration"), err)) //nolint:err113
	}

	return d
}