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CLI.go
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CLI.go
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package poker
import (
"bufio"
"fmt"
"io"
"strconv"
"strings"
)
type Game interface {
Start(numberOfPlayers int)
Finish(winner string)
}
func NewCLI(in io.Reader, out io.Writer, game Game) *CLI {
return &CLI{
in: bufio.NewScanner(in),
out: out,
game: game,
}
}
type CLI struct {
in *bufio.Scanner
out io.Writer
game Game
}
const PlayerPrompt = "Please enter the number of players: "
const BadPlayerInputErrMsg = "Bad value received for number of players, please tye again with a number"
const BadWinnerInputMsg = "invalid winner input, expect format of 'PlayerName wins'"
func (cli *CLI) PlayPoker() {
fmt.Fprint(cli.out, PlayerPrompt)
numberOfPlayersInput := cli.readLine()
numberOfPlayers, err := strconv.Atoi(strings.Trim(numberOfPlayersInput, "\n"))
if err != nil {
fmt.Fprint(cli.out, BadPlayerInputErrMsg)
return
}
cli.game.Start(numberOfPlayers)
winnerInput := cli.readLine()
winner, err := extractWinner(winnerInput)
if err != nil {
fmt.Fprint(cli.out, BadWinnerInputMsg)
return
}
cli.game.Finish(winner)
}
func extractWinner(userInput string) (string, error) {
if !strings.HasSuffix(userInput, " wins") {
return "", fmt.Errorf("winner bad formed")
}
return strings.Replace(userInput, " wins", "", 1), nil
}
func (cli *CLI) readLine() string {
cli.in.Scan()
return cli.in.Text()
}