package env

import (
	"fmt"
	"strings"

	"github.com/qdm12/gluetun/internal/configuration/settings"
	"github.com/qdm12/gosettings/sources/env"
)

func (s *Source) readShadowsocks() (shadowsocks settings.Shadowsocks, err error) {
	shadowsocks.Enabled, err = env.BoolPtr("SHADOWSOCKS")
	if err != nil {
		return shadowsocks, fmt.Errorf("environment variable SHADOWSOCKS: %w", err)
	}

	shadowsocks.Address = s.readShadowsocksAddress()
	shadowsocks.LogAddresses, err = env.BoolPtr("SHADOWSOCKS_LOG")
	if err != nil {
		return shadowsocks, fmt.Errorf("environment variable SHADOWSOCKS_LOG: %w", err)
	}
	shadowsocks.CipherName = s.readShadowsocksCipher()
	shadowsocks.Password = env.StringPtr("SHADOWSOCKS_PASSWORD", env.ForceLowercase(false))

	return shadowsocks, nil
}

func (s *Source) readShadowsocksAddress() (address string) {
	key, value := s.getEnvWithRetro("SHADOWSOCKS_LISTENING_ADDRESS",
		[]string{"SHADOWSOCKS_PORT"})
	if value == "" {
		return ""
	}

	if key == "SHADOWSOCKS_LISTENING_ADDRESS" {
		return value
	}

	// Retro-compatibility
	return ":" + value
}

func (s *Source) readShadowsocksCipher() (cipher string) {
	_, cipher = s.getEnvWithRetro("SHADOWSOCKS_CIPHER",
		[]string{"SHADOWSOCKS_METHOD"})
	return strings.ToLower(cipher)
}