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package main
import (
"flag"
"fmt"
"log"
"math/rand"
"sync"
"time"
)
func main() {
numPlayers := flag.Int("n", 2, "Number of players")
sides := flag.Int("sides", 6, "How many sides the die should have")
flag.Parse()
if *numPlayers < 2 {
log.Fatalf("we need at least 2 players")
}
if *sides < 2 {
log.Fatalf("die needs at least two sides")
}
fmt.Println("Welcome to the game")
fmt.Printf("There are %d players, each with a %d-sided die\n", *numPlayers, *sides)
game(*numPlayers, *sides)
}
type Score struct {
id int
score int
}
// The player with the lowest score wins.
func game(numPlayers, faces int) {
// Get the game's winning number by throwing the die once.
winningNumber := throwDie(faces)
fmt.Printf("Winning number is %d\n", winningNumber)
// The scores channel communicates the number of turns a
// player took to hit the winning number.
scores := make(chan Score)
var wg sync.WaitGroup
for i := range numPlayers {
id := i + 1
// Spawn a player.
wg.Go(func() {
var score int
// Start rolling the dice!
for {
score++
outcome := throwDie(faces)
fmt.Printf("Player %d threw a %d\n", id, outcome)
if outcome == winningNumber {
scores <- Score{id: id, score: score}
return
}
time.Sleep(1 * time.Second)
}
})
}
go func() {
wg.Wait()
close(scores)
}()
for score := range scores {
fmt.Printf("%v\n", score)
}
}
func throwDie(faces int) int {
return rand.Intn(faces) + 1
}
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