package system

import (
	"context"
	"strings"

	"google.golang.org/grpc/metadata"

	"github.com/netbirdio/netbird/version"
)

// DeviceNameCtxKey context key for device name
const DeviceNameCtxKey = "deviceName"

// OsVersionCtxKey context key for operating system version
const OsVersionCtxKey = "OsVersion"

// OsNameCtxKey context key for operating system name
const OsNameCtxKey = "OsName"

// Info is an object that contains machine information
// Most of the code is taken from https://github.com/matishsiao/goInfo
type Info struct {
	GoOS               string
	Kernel             string
	Core               string
	Platform           string
	OS                 string
	OSVersion          string
	Hostname           string
	CPUs               int
	WiretrusteeVersion string
	UIVersion          string

	BiosManufacturer     string
	BiosVersion          string
	ChassisType          uint
	ChassisTypeDesc      string
	ConnectionIp         string
	ConnectionMacAddress string
	CPUSignature         string
	DefaultGatewayIp     string
	ExternalIp           string
	LastReboot           string
	LocalIp              string
	MacAddress           string
	KernelMajorVersion   string
	KernelMinorVersion   string
	OSBuild              string
	OSProductName        string
	ProductTypeDesc      string
	SerialNumber         string
	SystemManufacturer   string
	SystemProductName    string
}

// extractUserAgent extracts Netbird's agent (client) name and version from the outgoing context
func extractUserAgent(ctx context.Context) string {
	md, hasMeta := metadata.FromOutgoingContext(ctx)
	if hasMeta {
		agent, ok := md["user-agent"]
		if ok {
			nbAgent := strings.Split(agent[0], " ")[0]
			if strings.HasPrefix(nbAgent, "netbird") {
				return nbAgent
			}
			return ""
		}
	}
	return ""
}

// extractDeviceName extracts device name from context or returns the default system name
func extractDeviceName(ctx context.Context, defaultName string) string {
	v, ok := ctx.Value(DeviceNameCtxKey).(string)
	if !ok {
		return defaultName
	}
	return v
}

// GetDesktopUIUserAgent returns the Desktop ui user agent
func GetDesktopUIUserAgent() string {
	return "netbird-desktop-ui/" + version.NetbirdVersion()
}