package params

import (
	"net"
	"os"

	"github.com/qdm12/golibs/logging"
	libparams "github.com/qdm12/golibs/params"
	"github.com/qdm12/golibs/verification"
	"github.com/qdm12/private-internet-access-docker/internal/models"
)

// ParamsReader contains methods to obtain parameters
type ParamsReader interface {
	// DNS over TLS getters
	GetDNSOverTLS() (DNSOverTLS bool, err error)
	GetDNSOverTLSProviders() (providers []models.DNSProvider, err error)
	GetDNSOverTLSVerbosity() (verbosityLevel uint8, err error)
	GetDNSOverTLSVerbosityDetails() (verbosityDetailsLevel uint8, err error)
	GetDNSOverTLSValidationLogLevel() (validationLogLevel uint8, err error)
	GetDNSMaliciousBlocking() (blocking bool, err error)
	GetDNSSurveillanceBlocking() (blocking bool, err error)
	GetDNSAdsBlocking() (blocking bool, err error)
	GetDNSUnblockedHostnames() (hostnames []string, err error)

	// Firewall getters
	GetExtraSubnets() (extraSubnets []net.IPNet, err error)

	// VPN getters
	GetNetworkProtocol() (protocol models.NetworkProtocol, err error)

	// PIA getters
	GetUser() (s string, err error)
	GetPassword() (s string, err error)
	GetPortForwarding() (activated bool, err error)
	GetPortForwardingStatusFilepath() (filepath models.Filepath, err error)
	GetPIAEncryption() (models.PIAEncryption, error)
	GetPIARegion() (models.PIARegion, error)

	// Shadowsocks getters
	GetShadowSocks() (activated bool, err error)
	GetShadowSocksLog() (activated bool, err error)
	GetShadowSocksPort() (port uint16, err error)
	GetShadowSocksPassword() (password string, err error)

	// Tinyproxy getters
	GetTinyProxy() (activated bool, err error)
	GetTinyProxyLog() (models.TinyProxyLogLevel, error)
	GetTinyProxyPort() (port uint16, err error)
	GetTinyProxyUser() (user string, err error)
	GetTinyProxyPassword() (password string, err error)

	// Version getters
	GetVersion() string
	GetBuildDate() string
	GetVcsRef() string
}

type paramsReader struct {
	envParams libparams.EnvParams
	logger    logging.Logger
	verifier  verification.Verifier
	unsetEnv  func(key string) error
}

// NewParamsReader returns a paramsReadeer object to read parameters from
// environment variables
func NewParamsReader(logger logging.Logger) ParamsReader {
	return &paramsReader{
		envParams: libparams.NewEnvParams(),
		logger:    logger,
		verifier:  verification.NewVerifier(),
		unsetEnv:  os.Unsetenv,
	}
}