package environ

import (
	context "context"
	"fmt"
	"io"
	"runtime"
	"text/tabwriter"
	"time"

	"google.golang.org/grpc"
)

// GetClientEnvironment returns the clients environment.
func GetClientEnvironment() *Environment {
	clientEnv := &Environment{
		Version:    Version,
		GitCommit:  GitCommit,
		BuildTime:  BuildTime,
		GoOsArch:   GoOsArch,
		ApiVersion: APIVersion,
		GoVersion:  runtime.Version(),
	}
	return clientEnv
}

// GetBuildInfo uses an existing grpc connection to request the server eviron and returns that with the client environ.
func GetBuildInfo(conn *grpc.ClientConn, timeout time.Duration) (clientEnv *Environment, serverEnv *Environment, err error) {
	clientEnv = &Environment{
		Version:    Version,
		GitCommit:  GitCommit,
		BuildTime:  BuildTime,
		GoOsArch:   GoOsArch,
		ApiVersion: APIVersion,
		GoVersion:  runtime.Version(),
	}

	svcClient := NewEnvironmentSvcClient(conn)

	ctx, cancel := context.WithTimeout(context.Background(), timeout)
	defer cancel()
	rsp, err := svcClient.GetEnvironment(ctx, &Void{})
	if err != nil {
		return clientEnv, nil, fmt.Errorf("failed to contact environ server")
	}
	return clientEnv, rsp, nil

}

// PrintBuildInfo prints the environment for client and server, if they are defined
func PrintBuildInfo(out io.Writer, clientEnv, serverEnv *Environment) {
	if clientEnv != nil {
		w := tabwriter.NewWriter(out, 0, 0, 1, ' ', 0)
		fmt.Fprintln(w, "Client:")
		fmt.Fprintf(w, " Version:\t%s\n", clientEnv.Version)
		fmt.Fprintf(w, " API version:\t%s\n", clientEnv.ApiVersion)
		fmt.Fprintf(w, " Go version:\t%s\n", clientEnv.GoVersion)
		fmt.Fprintf(w, " Git commit:\t%s\n", clientEnv.GitCommit)
		fmt.Fprintf(w, " Built:\t%s\n", clientEnv.BuildTime)
		fmt.Fprintf(w, " OS/Arch:\t%s\n", clientEnv.GoOsArch)
		w.Flush()
	}
	if serverEnv != nil {
		w := tabwriter.NewWriter(out, 0, 0, 1, ' ', 0)
		fmt.Fprintln(w, "Server")
		fmt.Fprintf(w, " Version:\t%s\n", serverEnv.Version)
		fmt.Fprintf(w, " API version:\t%s\n", serverEnv.ApiVersion)
		fmt.Fprintf(w, " Go version:\t%s\n", serverEnv.GoVersion)
		fmt.Fprintf(w, " Git commit:\t%s\n", serverEnv.GitCommit)
		fmt.Fprintf(w, " Built:\t%s\n", serverEnv.BuildTime)
		fmt.Fprintf(w, " OS/Arch:\t%s\n", serverEnv.GoOsArch)
		w.Flush()
	}
}