// Rock-Paper-Scissors -- finished version.
//
// Run with: go run projects/rock-paper-scissors/finished.go

package main

import (
	"bufio"
	"fmt"
	"math/rand"
	"os"
	"strings"
)

func main() {
	reader := bufio.NewReader(os.Stdin)

	fmt.Print("Choose rock, paper, or scissors: ")
	text, _ := reader.ReadString('\n')
	player := strings.TrimSpace(text)

	// The computer picks one of three at random, without a list.
	roll := rand.Intn(3) + 1
	var computer string
	switch roll {
	case 1:
		computer = "rock"
	case 2:
		computer = "paper"
	default:
		computer = "scissors"
	}

	fmt.Printf("The computer chose %s.\n", computer)

	if player != "rock" && player != "paper" && player != "scissors" {
		fmt.Println("That is not a valid choice.")
	} else if player == computer {
		fmt.Println("It is a tie!")
	} else if (player == "rock" && computer == "scissors") ||
		(player == "paper" && computer == "rock") ||
		(player == "scissors" && computer == "paper") {
		fmt.Println("You win!")
	} else {
		fmt.Println("You lose!")
	}
}